Topics in Medicine and Surgery
Chelonian Emergency and Critical Care
Terry M. Norton, DVM, Dip. ACZM
Abstract
There are numerous chelonian species that arise from a diverse array of habitats.
Chelonians are long lived and slow to reach sexual maturity, making them extremely
vulnerable to human impacts on their habitat and populations. Unusual anatomic and
physiological features, such as the shell and being ectothermic, make chelonians
medically challenging for the veterinarian. This article presents information on the
medical evaluation and stabilization of critically ill and injured chelonian patients
presented to the emergency clinician. History taking, performing a physical examination, recommended diagnostic testing, fluid and transfusion therapy, cardiopulmonary
resuscitation principles, nutritional support, hospital environment, and therapeutic
agents recommended for the emergency and critical care of chelonians are reviewed.
Differential diagnoses are presented for a variety of conditions encountered by the
emergency clinician for marine turtles, tortoises, freshwater aquatic turtles, and terrapins. There are significant differences in the disease problems encountered by captive
and free-ranging specimens. This review will be useful for the veterinarian working in
private practice, zoological or aquarium medicine, and wildlife rehabilitation. Copyright 2005 Elsevier Inc. All rights reserved.
Key words: Chelonian; critical care; emergency; terrapin; tortoise; turtle
T
he order Chelonia1 or Testudines2 includes
tortoises, turtles, and terrapins and is comprised of approximately 270 species,1 one
quarter of which reside in North America.2 Chelonians reside in a wide range of ecosystems. Aquatic
species occur in marine, brackish, and freshwater
habitats, while terrestrial species reside in desert to
tropical environments. All reptiles, including Chelonia, are ectothermic and depend on environmental
heat and behavior to attain their preferred body
temperature (PBT). The preferred optimal temperature zone (POTZ) is a temperature range that allows reptiles to thermoregulate to maintain their
PBT. The POTZ varies among the different species
of chelonians.
Chelonians have long lifespans, often surpassing humans, and are slow to reach reproductive maturity. For
example, the loggerhead sea turtle reaches sexual maturity at approximately 25 to 35 years of age.3 The slow
sexual maturity rates of chelonians tend to make them
106
more susceptible than other vertebrates to human
pressure. These pressures include habitat degradation
and destruction, collection for commercial traffic such
as the pet trade, and exploitation for food and medicinal purposes. Chelonians are extremely hardy animals
and can have normal activity despite being critically
anemic (hematocrit ⬍5%) and hypoproteinemic (total protein ⬍1 g/dL). They can also survive months
without food and tolerate extreme levels of dehydration.
From the St. Catherines Island, Wildlife Survival Center, 182
Camellia Road, Midway, GA 31320.
Address correspondence to: Terry M. Norton, DVM, Dip.
ACZM, St. Catherines Island, Wildlife Survival Center, 182
Camellia Road, Midway, GA 31320. E-mail: tnmynahvet@
aol.com
© 2005 Elsevier Inc. All rights reserved.
1055-937X/05/1402-$30.00
doi:10.1053/j.saep.2005.04.005
Seminars in Avian and Exotic Pet Medicine, Vol 14, No 2 (April), 2005: pp 106 –130
107
Chelonian Emergency and Critical Care
Triage Principles In Chelonians
Presented For Emergency
Ideally, the emergency chelonian patient should be
medically evaluated and then stabilized. However,
initial emergency treatment may need to take precedence over a diagnostic work-up in a critically ill
turtle. When possible, a minimum database should
be established before starting emergency therapy.
The keys to success in medically managing chelonians are patience, minimizing the stress throughout
the course of treatment, minimizing the handling
time by being prepared, treating dehydration and
maintaining an adequate hydration status, providing
appropriate nutritional support, and lastly, maintaining the turtle at its POTZ.
History
The medical history is an important step in assessing
the critically ill chelonian.4,5 Captive specimens have
a high incidence of medical problems related to
husbandry issues. A questionnaire given to the client
or caretaker can save time and request the following
essential information:4
1.
Reference data: date, client and animal identification, common and scientific names, captive or free-ranging specimen, presumed sex
and age, duration of ownership, details of previous ownership, time in captivity, reason for
presentation.
2.
Information on the client’s animal collection:
animals in direct and indirect contact with the
presenting turtle.
3.
Free-ranging specimens: GPS coordinates, specific location of where the turtle was found,
time and date found, housing and transport
conditions since that time, details on any treatment provided.
4.
Housing: indoors, outdoors, both; enclosure
description.
5.
Environment: temperature range, heat source,
humidity, lighting, photoperiod, recent changes,
filtration and water quality in aquatic specimens.
6.
Nutrition: describe diet in detail, seasonal variation in diet, vitamin or mineral supplementation, food preparation and storage, how is water provided and frequency of water changes.
7.
Observations: description of activity level, appetite, fecal and urate/urine output and qual-
ity and quantity, clinical signs and behavior,
and duration of presenting signs.
8.
Reproductive data: breeding and egg-laying
details.
9.
Disease control: methods of disease control,
quarantine program details, disinfectants used,
information on all humans in contact with the
turtle, historical health problems in the collection, recent acquisitions.
10.
Hibernation: details of management.
Diagnostic Testing
The initial diagnostic workup may include a physical
examination, including body weight and morphometric measurements, clinical pathology, radiography, fecal examination, and possibly other specialized diagnostics. The emergency chelonian patient
should be maintained within its POTZ during the
diagnostic work-up. When working with these patients, the veterinarian should also minimize the
likelihood of transmitting contagious diseases by
wearing gloves, hand-washing between patients, and
disinfecting equipment during the examination and
hospitalization. Chelonians are challenging to evaluate medically and treat due to their highly evolved
and effective structural and behavioral defenses. The
shell is an anatomical feature unique to chelonians,
and the primary reason they are such a medical
challenge. The box turtle (Terrapene spp.) is the most
extreme example of this adaptation and may retreat
into its hinged shell so that it is difficult to safely
assess without sedation. Depending on the patient’s
physical condition and the species of chelonian, various levels of restraint will be needed for the initial
evaluation. A detailed physical examination may require sedation or anesthesia; however, chemical immobilization should be delayed until the patient has
been stabilized.
A systematic approach should be followed when
performing a physical examination on a chelonian.
An observational examination of the turtle before
handling can provide important information. General body condition, including overall musculature
and fat, degree of alertness and strength, head and
body symmetry, aural swellings, ocular abnormalities
(eg, discharge, squinting, and sunken eyes from dehydration), nasal discharge, asymmetric nares, respiratory difficulty, open mouth breathing, cervical
swelling, carapacial abnormalities (eg, fractures and
other injuries or deformities), lameness or abnormal
flipper use, abnormal skin (eg, dry, flaky or ulcerated), an inability to dive or floating asymmetrically
108
are all abnormalities that can be observed without
handling the animal.
A physical examination form that includes a turtle
diagram is recommended for recording biological
data and external abnormalities such as shell fractures, missing flippers or limbs, and lacerations. Digital images can be used to document specific lesions
or injuries for long-term case monitoring. The gender,6,7 morphometrics, and age should be determined. A rough age estimate may be made by counting scute growth rings; however, these are not necessarily a sensitive method for age determination.
Body weight should be recorded before therapy, and
then measured serially during treatment. Weight
trends can be a good indicator of hydration status.
Deep cloacal temperature may be representative
of the chelonian’s recent environmental temperature, and is an important parameter to obtain and
monitor in hypo- and hyperthermic patients. A digital, distant laser, thermal monitoring device (Raynger St, Raytek Corporation, 1201 Shaffer Road, P.O.
Box 1820, Santa Cruz, CA USA) can be used to
detect surface body temperature, and when directed
at the prefemoral or prescapular areas correlates
well with core body temperature.4 Heart rate and
rhythm can be assessed with an esophageal stethoscope, a pulse oximeter cloacal probe, or a doppler
probe placed in the region of the thoracic inlet
between the distal cervical region and the proximal
front leg.8-10
Evaluate the limbs for swollen joints and fractures.
The plastron and carapace should be evaluated for
scute quality, abnormal keratinization, hardness and
pliability, pyramiding, fractures, ulceration, malodor, and external parasites or epibionts. Hemorrhage within the scute keratin may be indicative of
trauma if localized or septicemia if more generalized. Shell fissures usually occur at the plastron/
carapace junction and may indicate septicemia, vasculitis, or hypoproteinemia.11 Examine the skin for
sloughing, abnormal shedding, swellings, edema, abscesses, ulceration, exudate, malodor, and epibiota
and external parasites.
Digital palpation of the caudal coelomic cavity
through the inguinal fossa can be used to confirm
the presence of eggs, cystic calculi, organ enlargement, masses, or fluid. The cloacal region should be
examined for swelling, trauma, abnormal discharge,
infection, and myiasis. In larger chelonians, digital
palpation of the cloaca can be used to assess gravidity, colonic and cloacal tone, cystic calculi or space
occupying lesions.4
Exteriorizing the head of the chelonian from the
shell and performing an oral examination can be
Terry M. Norton
difficult for the veterinarian and stressful for the
chelonian. This examination may need to be delayed
until the turtle is stabilized.4 Once the head is exteriorized, inspect the oral cavity including the tongue,
glottis, choana, and outlets of the eustachian tubes.
Particular attention should be given to mucous
membrane color, the quantity of mucus, petechiation, plaques, ulceration and caseous material. Be
prepared to obtain any diagnostic specimens and
administer any medications or nutritional support
via a stomach tube if indicated. Perform a complete
ophthalmic examination of the cornea, anterior and
posterior chambers, and menace and papillary visual
reflexes. A periocular examination and evaluation of
the beak, mandible, tympanic membranes and nares
should also be performed while the head is restrained.
An emergency chelonian minimum database
should consist of a hematocrit, total solids, glucose,
and subsequently, a complete blood count and
plasma biochemical panel. Bacterial blood cultures
should be collected before initiating antimicrobial
therapy. While the size and patient condition will
dictate the amount of blood that can be safely collected, the author generally recommends 0.5 to 0.8
mL/100 g body weight for healthy patients and a
reduced sample volume for diseased patients. Lithium or sodium heparin are the anticoagulants of
choice, because EDTA can cause red blood cell lysis
in chelonians.12
A wide range of venipucture sites can be used in
chelonians,4,13-17 and the choice of site should be
based on the species, size and condition of patient.
Lymph contamination of the blood sample is a common problem in chelonians and will alter many clinical pathology parameters.13,16,18-20 Collection of
blood from the jugular vein is preferred based on
the low incidence of lymph dilution from this site,13
but may be stressful and not always feasible due to
the difficulties in accessing the vein. Alternative sites
used by the author include the brachial and subcarapacial veins in tortoises, the dorsal tail vein in aquatic
species, and the cervical sinus in sea turtles.
Radiography is an important diagnostic tool used
to assess chelonian emergencies. Useful reviews of
chelonian radiography are available.21-26 Radiopaque
materials such as barnacles should be removed from
the shell before performing a radiographic study.
Three radiographic views should be routinely performed in chelonians presented for emergency care:
anterior-posterior and lateral projections using a
horizontal x-ray beam and a dorsoventral view.22,23
Additional views such as lateral, dorsoventral and
oblique, may be needed for specific problems such
109
Chelonian Emergency and Critical Care
as fractures of the limbs or skull. An anterior-posterior horizontal beam radiograph should be taken in
chelonians with fractures of the carapace to assess
lung involvement.26 Digestive tract radiographic contrast procedures are often necessary to document
intestinal obstruction and foreign bodies.22
Determining Hydration Status and
Fluid Therapy
On completion of the initial evaluation, the patient
should be stabilized. Most chelonians presented for
emergency care are dehydrated, thus rehydration is
often the first step in treatment. Physical examination findings indicative of dehydration in chelonians
include sunken eyes, changes in skin turgor, skin
tenting, loss of skin suppleness, dry mouth with
ropey, thick oral secretions, depression, a slow and
difficult to find heart beat, and minimal to no urination. Venipuncture and tube feeding are more
challenging in the dehydrated patient.1 Weight loss
found over 1 to 14 days is likely caused by dehydration, thus serial body weights should be performed
during hospitalization.1 Elevation of the packed cell
volume (PCV) and total solids or total protein (TP)
can be helpful in determining the extent of dehydration. However, ill chelonians are often anemic
and hypoproteinemic, which may mask the extent of
dehydration. Serial PCV and plasma TP determinations help assess the status of the patient and target
the most appropriate therapeutic regimen. Hypoglycemia or hyperglycemia is often present in sick chelonians. Blood glucose determination is easy, quick,
inexpensive and essential in choosing the appropriate fluid therapy in chelonians.
Fluid Types
Selecting the route, rate and type of fluids to administer depends on the species of chelonian and condition of the patient. Fluid choice is frequently dictated by clinician preference, the patient’s presenting problem, and clinical pathology and acid-base
abnormalities. Many ill tortoises have isotonic or
hypotonic dehydration.27 Lactic acidosis is common
in stressed chelonians. Most debilitated chelonians
benefit from rehydration therapy and glucose supplementation. Mammalian crystalloid fluid preparations are suitable for chelonians. Fluids commonly
used in chelonians include “reptile ringers solution”
(one part Lactated Ringers Solution ⫹ 2 parts 2.5%
dextrose and 0.45% sodium chloride),27-29 Normasol-R1, and lactated ringers solution. Use of lactated
ringers solution is controversial in chelonians based
on the common finding of lactic acidosis.27,28 It is
critical to correct hydration status of the ill chelonian before starting oral nutritional support.
Whole blood transfusions are indicated in cases of
acute hemorrhage and life-threatening anemia.30
Sea turtles with a PCV ⱕ5% may benefit from a
whole blood transfusion from a healthy captive sea
turtle donor (Manire, C, pers comm., 2005). Those
chelonia with a PCV ⬎5% can often be successfully
managed with fluid therapy, iron supplementation,
and other supportive measures. The donor and recipient should be the same species, because cross
matching has not been perfected in reptiles. Acidcitrate-dextrose solutions are the preferred anticoagulants for storing blood for transfusions.
Hetastarch, diluted 1:2 or 1:3 with 0.9% saline,
can be given at a rate of 0.1 mL/kg every 10 to 15
minutes in chelonians with severe shock from massive blood loss.1 A purified bovine hemoglobin (Oxyglobin, Biopure Corp., Cambridge MA 02141) has
had limited clinical use in sea turtles,29 desert tortoises,30 and a terrapin31 without adverse affects. In
healthy desert tortoises (Gopherus agassizi) this product was administered at dose of 20 mL/kg IV without
adverse effect.30 A Hispaniolan slider, Trachemys decorata, was resuscitated after near exsanguinations with
the use of Oxyglobin and a single blood transfusion
from another individual of the same species. Discolored mucous membranes are normally observed after using this product.30
Route of Fluid Therapy
Intravascular. In severely compromised chelonians, intravenous (IV) or intraosseous (IO) routes of
fluid administration allow for rapid rehydration and
emergency therapy. However, placement and maintenance of catheters in these sites can be technically
challenging, especially in aquatic species, and should
be reserved for patients that are unconscious or
minimally responsive.1 The jugular vein is the preferred site for IV catheter placement in most chelonians. A small skin incision allows direct visualization
of the vessel. After catheter placement, secure the
catheter to the skin with tape and or suture.1,32 Maintaining patency of the jugular catheter may be difficult, especially in active turtles.33 Intravenous or IO
routes are necessary for administration of whole and
artificial blood, colloidal fluids, and fluids containing greater than 5% dextrose.1,30,34-36 Intraosseous
catheters may be placed in the distal humerus, distal
femur or plastron-carapacial bridge.33,37 An appropriately sized spinal needle can be inserted into the
distal one fourth of the medial aspect of the humerus at an angle of approximately 30 to 45° from
110
parallel. The needle should be inserted as distally as
possible without entering the joint capsule. Confirm
the spinal needle position radiographically. The
catheterized limb should then be reduced into the
fossae and secured with tape to the carapace.33 The
primary disadvantages associated with IO catheters
are that the fluid flow rate is limited due to the small
bone marrow space, fluid and drug administration
may be painful, and the metal of the spinal needle
may fatigue and break.38
Bolus IV fluid therapy can be used to stabilize
some patients before pursuing other routes of administration. The subcarapacial vein is used for most
chelonians and the cervical sinus for sea turtles.
Advantages to the bolus IV method include easy
vessel accessibility, minimal stress to the patient, and
repeated vascular access.
The epicoelomic fluid administration site is useful
in chelonians that are completely retracted into
their shell and difficult to coerce out. McArthur
(2004) describes this as the preferred site for fluid
administration to critically dehydrated chelonians.27
The needle should be inserted into the potential
space located dorsal to the plastron and ventral to
the pectoral muscles, coelom, and the scapulohumeral joint, and directed caudally toward the opposite hind leg.32
The intracoelomic (IC) route is commonly used
for maintenance fluid therapy in sea turtles. Fluids
may be injected into the coelomic cavity through the
inguinal fossa. An IC catheter has been described for
use in sea turtles for up to 5 days.27,39 This route is
technically easy and allows administration of crystalloid fluids with up to 5% dextrose, however, fluids
may not be absorbed rapidly when given by this route.
Disadvantages of coelomic administration include the
potential of compromising the lung space or perforating the lungs, the urinary bladder,32 or an ovarian
follicle in mature females. Hypoproteinemic patients
may have fluid in the coelomic cavity (ascites/anasarca), which will further complicate absorption.
Subcutaneous fluid administration is technically
easy. Fluids can be given into any accessible fold of
skin, but are typically placed into the inguinal fossa,
front limb fossa, or ventral neck fold. Administering
the fluids in multiple sites may improve absorption
and rehydrate the chelonian faster. Disadvantages to
this route include poor absorption in severely debilitated chelonians and that only ⱕ2.5% dextrose solutions can be administered.
The oral route of fluid administration should be
reserved for use in patients with functional gastrointestinal tracts that are mildly to moderately dehydrated and for maintenance fluid therapy. Severely
Terry M. Norton
dehydrated and weak turtles tend to regurgitate
orally administered fluids. Fluids can be administered directly into the stomach using an appropriately sized, well-lubricated red rubber or metal feeding tube. An equine stomach tube may be used for
large chelonians. For long-term oral medication,
fluid therapy and nutritional support, an esophagostomy tube should be considered. The stomach volume in most chelonian patients is about 2% of the
body weight or 20 mL/kg.1,32 Anatomically, the stomach is located in the anterior one third to midcoelomic cavity. The distance to the anterior portion
of the stomach should be marked on the tube selected for feeding. In species prone to regurgitate
after tube feeding, such as sea turtles, the patient
should be placed at a slight incline on a padded
board to avoid regurgitation and to assist in passing
the feeding tube into the stomach. The head and
neck should be extended to straighten the esophagus for tube passage. The head should be secured by
grasping the turtle on either side behind the mandible. Steady downward pressure will cause the lower
jaw to fatigue and open. A padded speculum or
polyvinyl chloride tube can be used to keep the
mouth open. The turtle should be held in a vertical
position after the tube is removed and its head and
neck extended until it swallows to prevent leakage or
regurgitation.
Finally, soaking mildly dehydrated patients in
shallow luke warm water (75-80° F), which reaches to
just below the chin when the head is retracted, will
assist in rehydration.32 Mildly dehydrated marine
and estuarine turtles will benefit from placement in
fresh water for 24 hours. Not only will this help to
rehydrate these animals, but exposure to fresh water
will also reduce the epibota load. Fluids, various
drugs, elemental diets, and dewormers may be administered by the intracloacal route.1,40 Absorption
may be improved if the caudal aspect of the turtle is
elevated higher than the cranial aspect for 10 to 20
minute after fluid administration.
Volume of Fluids to Administer. The volume of
fluids to administer depends on the degree of dehydration and if hypoproteinemia and anemia are
present. Fluid volume should not exceed 2 to 3% total
body weight (TBW) in chelonians.41 Generally recommended maintenance fluid rates range from 15 mL/
kg/d in species greater than 1 kg to 25 mL/kg/d in
species less than one kilogram. A severely dehydrated
patient may tolerate up to 40 mL/kg/d. However, over
hydration is a concern because of the slow metabolism
in chelonians.32 Infusion or syringe pumps can be used
to accurately control the flow rate.
111
Chelonian Emergency and Critical Care
Table 1. Emergency Drugs Used to Treat Chelonians
Drug
Dosage
Comments
Doxapram
Prednisolone sodium succinate
5 mg/kg IM, IV1
5 to 10 mg/kg IV1
Dexamethosone sodium
phosphate
Methylprednisolone
Glycopyrrolate
Atropine
Epinephrine (1:1000, 1 mg/ml)
Midazolam
Diazepam
Activated charcoal, kaolin
0.1-0.25 mg/kg IV/IM1
Calcium EDTA
10-40 mg/kg IM q12 h79
Vitamin K1
Iron dextran
Calcium gluconate
Calcium lactate/Calcium
glycerophosphate
Potassium chloride
50% dextrose
0.2-2.5 mg/kg PO or IM176, as needed
12 mg/kg IM 1-2 times/wk176
100 mg/kg IM or IC q 8 h176
10 mg/kg SC, IM176
Mineral oil
Cisapride
6-10 mg/kg PO79
0.5-2.0 mg/kg PO q 24 h176
Respiratory stimulant
Short-acting steroid, used in shock
therapy
Same as above
20 mg/kg IV1
0.01 mg/kg or 0.05 ml/kg IV, IM, SC1
0.01-0.02 mg/kg IV, IM, SC1
0.1 mg/kg IV, intracardiac177
1.0 to 2 mg/kg IM or IV67
0.5 mg/kg IV79
2-8 gm/kg oral via stomach tube93
15-30 mEq/L of fluid29
1 mL/kg IV
CPR Principles in Chelonians
The following protocol is recommended for chelonians presented in respiratory or cardiovascular arrest. First, determine if the animal has a heartbeat
with a Doppler probe, electrocardiogram, and/or
ultrasound. Proceed only if cardiac electrical activity
is present. Second, extend the head and neck, swab
the mouth to remove any materials blocking the
glottis, and intubate the patient with an uncuffed
endotracheal (ET) tube. Use suction and or gravity
to remove any material from the ET. Ventilate the
patient with oxygen. An ambubag can be used for
field emergencies. Lubricate the eyes if they are
open. In the author’s experience, resuscitation is
futile if there is pungent odor on exhalation or
suction, reduced global pressure that gives the eyes a
dented appearance, and increased jaw tone. These
findings dictate euthanasia even if there is a heart
beat.1 Place an IV or IO catheter, obtain blood for a
minimum database, and then bolus fluids and emergency medications. If the heart rate remains below
20 bpm with ventilation and bolus fluids, glycopyr-
Short-acting steroid, CNS trauma
Treat bradycardia
Treat bradycardia
Cardiac stimulant
Control seizures
Control seizures
Absorbs and neutralizes some
poisons
Heavy metal chelator, zinc and lead
toxicity
Coagulopathies, hepatic disease
Iron-deficiency anemia
Hypocalcemia
Hypocalcemia
Hypokalemia
Recommend administering at 5-10%
in fluids slow bolus for
hypoglycemia
Gastrointestinal stasis
rolate (IV) or atropine (IV) should be administered.1 Epinephrine can be given IV, IO, IP, intratracheally or intracardiac.33
Therapeutic Agents Used in Chelonian
Emergency and Critical Care
Although several pharmacokinetic studies have recently been conducted on chelonians,42-53 limited
information is available on accurate dosing for the
numerous species presented to the emergency clinician (Refer to Tables 1, 2, and 3 for dosages). Drugs
with available pharmacokinetic data should be selected when possible. Although there are limitations
to metabolic scaling, it can be a useful tool when no
pharmacokinetic data are available.1 Because sick
chelonians do not necessarily absorb drugs well, it is
important to correct hypothermia, dehydration, hypoglycemia, acid-base and electrolyte imbalances before or in conjunction with starting other therapeutic agents. This is especially important when using
nephrotoxic or hepatotoxic drugs and anesthetics.
Drug pharmacokinetics are temperature dependent
112
Terry M. Norton
Table 2. Antimicrobials Used to Manage Critical Care Chelonian Patients
Drug
Dosage and frequency
Comments
Ceftazidime
*5 mg/kg IM q 48 h (gopher tortoises)42, 2.53.0 mg/kg IM q 72 h (sea turtles), 50 mg/
10 ml saline ⫻ 30 min nebulization q 12 h
*20 mg/kg SC, IM, IV q 72 h44,45
Chloramphenicol
30-50 mg/kg IM q24h, 50 mg/kg PO q24h79
Clarithromycin
Clindamycin
*15 mg/kg PO q 48-72 h47
5 mg/kg PO/IM q 24 h
Enrofloxacin
*5 mg/kg SC/IM q 24-48 h,49,50 *10 mg/kg PO
q 24 h53
*20 mg/kg PO q 48 h (anaerobes) (yellow rat
snakes and iguanas)48
Amikacin
Metronidazole
Fluconazole
Itraconazole
Acyclovir
Targets primarily Gram-negative
bacteria, potentially nephrotoxic
Targets primarily Gram-negative
bacteria, less nephrotoxic than
amikacin
Bacteriostatic, aerobic, and
anaerobic antibacterial spectrum
Used to treat Mycoplasma URTD
Good anaerobic spectrum, use in
combination with amikacin,
ceftazidime, or enrofloxacin
Irritating to tissue, recommend
diluting and giving SQ
Excellent efficacy against anaerobic
bacteria, very bitter, potential for
toxicity
*21 mg/kg loading dose, then 10 mg/kg q 5 d
SQ, IV51
*5 mg/kg PO SID or 15 mg/kg PO q 72 h (sea
turtles)46
80 mg/kg PO SID1 to TID30; Topical (5%
ointment) q 12 h30
*indicates the dose is based on pharmacokinetics, duration of therapy will depend on the clinical problem and response, but most antimicrobial regimens
in critically ill chelonians are administered for a minimum of 2-3 weeks.
in reptiles, and it is best to maintain the chelonian
patient at its POTZ during therapy.32 Many medications are unpalatable when administered orally, but
can be followed by something palatable (eg, a/d
diet, tuna juice, fruit or sweet vegetable baby food)
to lessen the negative effect.1
Antimicrobial Therapy in the Critically
Ill Chelonian
Sick and injured turtles are usually given broadspectrum antibiotics as a treatment for established
bacterial infections or as a preventive measure (Refer to Table 2 for dosages). Diagnostic samples
should be obtained for culture and antimicrobial
sensitivity testing before starting antibiotic therapy
whenever possible. Although controversial, the front
half of body, including the soft tissues of the forelimbs and neck, should be used for injections,1,54,55
especially when using nephrotoxic drugs. Enrofloxacin is a commonly used antibiotic in chelonians and
has good efficacy against aerobic Gram-negative bacteria. Unfortunately, it can cause tissue necrosis
when injected multiple times IM or SQ and is painful
on administration. The irritating effect of the drug
can be reduced significantly by diluting it in fluids or
sterile water and using the subcutaneous route for
injection. Once the patient is stabilized, it can be
administered orally.53 Anaerobic bacteria can also
cause significant morbidity in chelonians and should
be considered when deciding on a therapeutic plan.
Analgesic in the Critically Ill Chelonian
Many critically ill chelonians are painful and benefit
from analgesics. Chelonians are relatively stoic and
challenging to assess for pain (refer to Table 3 for
dosages). Pain may be exhibited in chelonians by a
decreased appetite, depression, or alteration in normal behavior. The nonsteroidal antiinflammatory
drugs (NSAID) are long acting and decrease endotoxin production in septic patients.1,56,57 Meloxicam,
carprofen, ketoprofen, and flunixin megalimine
have all been used in chelonians.1,56,57 Although
NSAID efficacy has not been evaluated extensively by
controlled studies, anorexic and depressed cheloni-
113
Chelonian Emergency and Critical Care
Table 3. Analgesics and Anesthetics Used to Manage Critically Ill Chelonian
Drug
Butorphanol
Dosage
Comments
0.2-2 mg/kg IM, 0.2-0.5 mg/kg IV, IO67
Premedication, analgesia, lower
dose if debilitated, 4h duration
Buprenorphine
0.1-1 mg/kg IM67
Same as above
Meloxicam
*0.2 mg/kg SC, IM, IV; 0.4 mg/kg PO q24-48
Rehydrate patient prior to
hrs56
administration
Carprofen
1-4 mg/kg PO, SC, IM, IV q24h175
Same as above
Medetomidine/ketamine M/K Tortoises- M: 0.075 to 0.15 mg/kg K:5
Reverse M with atipamazole at 5
mg/kg58,59,60,65,66; Aldabra tortoises- M:0.025 to
times the Medetomidine dose in
0.08 mg/kg, K:5 mg/kg59, Freshwater aquatic
mg (same volume)
turtles- M:0.3 mg/kg, K:5 mg/kg67, can add
0.4 mg/kg butorphanol to this regimen67;
Propofol
10-15 mg/kg IV67; desert tortoises: low dose 2-4 Administer slowly to effect over 1-2
mg/kg IV, moderate dose 5-8 mg/kg IV, high
minutes, dilute 1:2 with saline67
dose 12 mg/kg IV67
ans often develop normal feeding behavior and activity after NSAID administration. Adequate hydration and renal function should be assured before
NSAID administration and duration of administration should not exceed 3 to 5 days.57,10
The opioids, butorphanol and buprenorphine,
are commonly used in chelonians to manage pain.
The disadvantages associated with opioid administration are that they are relatively short acting and
may cause sedation in debilitated patients. Butorphanol is contraindicated in patients with head
trauma.1
Anesthesia in the Critically Ill Chelonian
While anesthesia or sedation is necessary in some
emergency situations, it should be used with caution
in dehydrated or debilitated patients (refer to Table
3 for dosages).1,32 A thorough diagnostic workup
should occur before anesthesia and should be delayed if the heart rate less is ⬍15 bpm when the
patient is maintained at its POTZ, if blood work
reveals a PCV ⬍10% or a plasma TP ⬍2.0 g/dL, or if
there is evidence of sepsis or severe respiratory compromise.1
Several excellent reviews and controlled studies
on injectable and inhalant anesthestic regimens
have been recently conducted in chelonians.57-67 It is
important for the emergency clinician to be comfortable with a few anesthetic regimens that can be
applied to a wide range of chelonian species under a
variety of circumstances. The author’s preference for
injectable anesthetics include the combination of
medetomidine and ketamine58,59,66 or propofol IV67
for short, relatively noninvasive procedures or for
induction of general anesthesia. The advantages of
the medetamidine and ketamine combination are
that it may be given IM or IV, the medetomidine is
reversible with atipamezole, and very low doses of
ketamine may be used because of the synergism with
medetomidine. The low ketamine dose does make a
significant difference in the level of sedation and
muscle relaxation. Butorphanol may be added to the
medetomidine and ketamine cocktail for additional
analgesia and sedation.67 Disadvantages of the medetomidine and ketamine anesthetic regimen include significant species variations in anesthesia and
sedation in response to the drug combination and
induction of significant bradycardia, hypotension,
hypercapnia, and hypoxemia. Furthermore, these
drugs may be contraindicated in debilitated or dehydrated chelonians, especially those with hepatic or
renal dysfunction. The lower end of the dose range
should be used in debilitated chelonians. Propofol is
a hypnotic sedative that provides rapid induction.
While intravenous injection is preferred, the drug
does not cause irritation if it is administered extravascularly.57 If propofol is given by rapid infusion,
it can cause a marked respiratory depression.67
Propofol dosages for chelonians range from 2 to 15
mg/kg, and recovery rates are dose dependent. Use
the lower end of the dose range in debilitated chelonians to allow intubation. Local anesthesics, such
as lidocaine, may be used alone or in combination
with injectable or inhalation anesthesia.68
Inhalant anesthetics should be used for invasive
or prolonged procedures. In critical chelonian pa-
114
tients, it may be advisable to use inhalation anesthetics without an injectable induction agent. Ventilation and thermoregulatory support should be maintained during the procedure and throughout the
recovery period. Monitor heart rate via a Doppler,
pulse oximeter, or ECG. Intraoperative fluid therapy
and vascular access for emergency support should be
maintained. Although isoflurane is useful in reptiles,
sevoflurane provides significant reduction in recovery times and may be more appropriate for critically
ill patients.64 Sea turtles are notorious for prolonged
recoveries with a variety of anesthetic regimens and
have much faster recoveries when using the reversible combination of medetomidine and ketamine for
induction and sevoflurane for maintenance anesthesia.69
Nutrition Needs of this Species in the
Emergency Setting
Nutritional support is an important component of
chelonian critical care.1 Patients respond more
quickly to therapy if their nutritional status is positive.1 The critically ill chelonian is often immunosuppressed secondary to starvation.1 Regurgitation and
aspiration may occur in dehydrated and debilitated
chelonians. These turtles may not be able to digest
solid food and the material may remain in the stomach as a result of decreased gastrointestinal (GI)
motility. Thus GI nutritional support should not be
instituted until the patient has been rehydrated and
attains normal blood glucose and GI motility. The
volume of formula fed by stomach tube is approximately 7% of the turtle’s body weight in grams daily.
Begin with smaller volumes and more dilute solutions and steadily increase the volume and concentration to meet the turtle’s nutritional requirements.
The turtle should be weighed daily during the convalescent period, and the measurement of weight
gain or loss can be used as a guide for dietary management.
Esophagostomy tubes (E-tubes) are integral in
managing the critically ill chelonian. The stress associated with tube placement is short, and usually far
outweighs the stress associated with daily head restraint to administer oral medications, fluid therapy,
and nutritional support. An E-tube may be left in
place for months, is usually well tolerated by the
turtle, and most clients can manage the turtle with
an E-tube at home. The tube should be left in until
the animal is eating normally. An E-tube may be
stressful to patients where the tube prevents them
from withdrawing into the shell, and therefore may
be contraindicated in such patients. Possible complications of E-tube placement include cellulitis or ab-
Terry M. Norton
scess formation at the stoma site and ulceration or
erosion with or without perforation of the gastric
wall at the point where the tube contacts the stomach. Smaller patients are at greater risk of developing problems from the E-tube. Smaller tube size and
the propensity to clog with thick solutions may limit
the ability to meet the patient’s nutritional needs.
The technique for placing an E-tube has been described.1,27 Sedation is recommended for tube placement. Test the formula to be used before tube placement to assure it will pass through the tube without
clogging. The tube should enter at the mid to lower
esophagus rather that the upper esophagus or pharyngeal region. Premeasure the tube and obtain radiographs after E-tube placement to confirm tube
positioning. A purse string suture and Chinese finger lock suture will secure the tube. Flexible tubing
should be used that allows for flexion and extension
of the neck. After feeding, the tube should be
flushed with water or saline to remove any gruel.
Enteral tube feeding formulas that have been used
in various species of chelonians can be found in
Table 4.
Hospitalization
A dedicated room or facility designed to accommodate the various levels of medical care required for
chelonians is ideal, however, this is usually not practical. The veterinarian and hospital care staff should
have access to literature on the natural history and
husbandry needs of the various chelonian species
presented to the facility for medical care2,70-75 (www.
chelonia.org, world chelonian trust web site). Hospital personnel should be trained in chelonian husbandry and medicine. The importance of infectious
disease control during the physical examination, diagnostic work up, and hospitalization cannot be
overemphasized. Chelonians with suspected infectious disease should be hospitalized in isolation. In
aquatic settings, separate filtration systems should be
used for turtles with suspected infectious diseases.
Captive specimens should not be exposed to wild
specimens and visa versa. The clinician should avoid
mixing species and separate animals from different
sources. Enclosures should be simple in design and
made out of easy to disinfect, nonporous, nonabrasive materials such as plastic, glass, painted or sealed
wood, stainless steel, or fiberglass. Plastic storage
tubs, plastic swimming pools, and modified plastic
dog kennels can be used to house hospitalized chelonians. Intensive care units used for avian species
can be used for smaller critically ill chelonians. The
best substrate for use in a critical care setting should
pose minimal fire risk, if ingested should not cause
115
Chelonian Emergency and Critical Care
Table 4. Enteral Feeding Formulas and Diets for Anorexic and Critically Ill Chelonians
Enteral diet information
Herbivores
Comments
Critical Care diet (Oxbow Pet Products, 29012 Mill
Road, Murdock, NE 68407, 800-249-0366)
1 part alfalfa pellets blended for several minutes
with 2-4 parts water
Alfalfa Powder78 (NOW foods, Glendale Heights, IL
60108), comprised of alfalfa that has been
harvested, dried and powdered, can mix with
fruit baby foods for frugivorous species
Green Powder78 (NOW foods, Glendale Heights, IL
60108), comprised of barley grass that has been
harvested, dried and powdered.
Omnivores/
Carnivores
Elemental
diets easily
absorbable
Emeraid II (Lafeber Co., Cornell, IL 61319)
Walkabout Farms enteral feeding diets
Canine/feline a/d diet® (Hill’s Pet Nutrition, Inc.,
Topeka, KS 66601) (mixed with 4 jars of
vegetable baby food)
Critical Care diet (Oxbow Pet Products)
Ensure ®(Abbott Laboratories, Abbott Park, IL
60064) alone or mixed with fish blenderized (sea
turtles), add mixed green vegetables for green
sea turtles (Chelonia mydas)
Walkabout Farms enteral feeding diets
1) Peptamen (elemental diet for children) (Nestle
USA Inc., Deerfield, IL 60015)
2) Vivonex Novartis, (Novartis, Minneapolis, MN
55416)
an impaction, and should allow for proper wound
and waste management.76,77 Compressed, baled
hemp chippings, shredded paper, newspaper, and
rabbit pellets may be used.76,77 Hide areas within the
enclosure should be used to make the patient more
comfortable and assist in thermoregulation. Hides
can be made out of disposable materials such as
cardboard boxes and margarine containers with
holes cut in them. Appropriate containers for food
and water should also be provided.
Hospital personnel should become familiar with
the POTZ for the species presented for emergency
evaluation and potential hospitalization. In general,
reptiles are hospitalized at the mid- to high end of
their POTZ, but should still be provided with a thermogradient. Basking lights, infrared ceramic heat
bulbs, or thermostatically controlled radiant heating
panels can be mounted to walls of the enclosure or
Alfalfa based product, may clog
smaller tubes,
www.oxbowhay.com
Very thick and may clog tube
Health or natural food stores,
1 part volume powder to 5 parts
of water, only short term by
itself, add extra calcium, Vit D,
psyllium (methylcellulose)-motility
disorders
Same as above, more crude fiber,
lower crude protein, lower levels
of Ca and Ph so better for gout
and renal failure
http:www.herpnutrition.com
Add vitamin/mineral
supplementation
http:www.herpnutrition.com
the cage front. The heat source should always be
placed outside of the enclosure. Under tank/enclosure heating elements are not recommended. Diurnal heat cycles (lowering the temperature at night)
are beneficial to recovering chelonians.76 Infrared or
ceramic heat emitters can be used as nighttime heat
sources without affecting photoperiod. Timers can
be set for light and heat source activation. The environmental temperature for a hospitalized patient
should be monitored daily with maximum and minimum thermometers or digital thermometers. Sick
chelonians that are too weak to move from a heat
source should be monitored closely.
Basking chelonians require exposure to full spectrum lighting.78 Several weaker UVA and UVB-emitting fluorescent tubes are commercially available.78
However, artificial lights cannot replace the benefits
of natural sunlight, thus moving the patient out-
116
doors when weather permits is probably best. Containers that facilitate moving the patient inside and
outside are helpful and efficient.76
Humidity should be measured and monitored in
all enclosures. As a general rule, desert chelonians
need to be kept at humidity levels ⬍40%, while
tropical species need humidity levels of ⬎ 60%.77
The humidity can be increased if necessary by providing heated water in bathing areas, regular misting
and dampening of substrate, using damp soil or
peat/sand base substrate, and keeping lids on holding areas. Open top enclosures will provide better
ventilation and are preferred for most chelonians.76
Initially, debilitated aquatic and semiaquatic species should be dry docked on a padded surface, such
as a shower box or plastic draining board mats.79
These turtles can be kept moist by regular misting
and placing Vaseline or another water soluble (K-Y)
jelly on the skin and shell. Once stabilized, these
animals require specialized facilities. Marine turtles
should be provided specially designed circular fiberglass tanks with a filtration system and continuous
flow, temperature controlled salt water. You must
adjust water levels to accommodate turtles with varying degrees of debilitation. Water quality issues need
to be addressed for all aquatic species. Semiaquatic
species need haul out areas with a basking heat
source. Turtles should not have direct access to electrical outlets, cords or filtration systems.
Differential Diagnosis and Medical
Principles of Emergency Care
in Chelonians
The general medical, surgical, and emergency care
principles used in various chelonian species are similar. Medical problems differ significantly between
chelonians coming from a captive or free-ranging
environment. The majority of problems encountered in captive chelonians can be traced back to
improper husbandry. It is not uncommon for a captive chelonian with a chronic medical problem to
present as an emergency. The environment (marine,
freshwater, estuarine, terrestrial) of free-ranging
chelonians will dictate the types of problems that are
encountered.
Traumatic Injuries
Trauma is a common reason for chelonians to be
presented for emergency care. Chelonians that experience a traumatic injury may present with uncontrolled hemorrhage, lacerations, head trauma, and
fracture of the limbs, skull, mandible, or shell. Prob-
Terry M. Norton
lems encountered in free-ranging marine turtles may
include boat related injuries secondary to propeller
or direct impact, encounters with predators such as
sharks, entrapment in dredging equipment, dropping on a boat deck after incidental capture, and
wounds created from fishing gear entanglement
such as nets, fishing line, crab and fish traps and
plastic rings from beverage containers. Captive marine turtles are predisposed to traumatic bite wounds
from interspecific (eg, shark in same aquarium) or
intraspecific aggression. Sea turtles should not be
housed together if space is limited. Freshwater and
estuarine species, such as the diamond back terrapin
(Malaclemys terrapin), encounter similar traumatic injuries as marine specimens. Aquatic and terrestrial
chelonians are commonly hit by automobiles or
trucks when crossing roads. Predators, primarily carnivores, commonly cause severe damage to freshwater and terrestrial chelonians by gnawing on the
limbs and shell.32
Traumatic injuries in chelonians often involve the
central nervous system (CNS) and require immediate attention. Short-acting corticosteroids such as
methylprednisolone, dexamethasone sodium phosphate, or prednisolone sodium succinate should be
administered IV and then repeated in 12 to 24
hours.1 Supportive care, wound care, broad-spectrum antibiotics, and analgesics are indicated depending on the type of injury. Warm the patient to
ambient indoor temperatures (68 - 75 F; 20 - 30° C)
only after hemostasis is achieved, antibiotics are on
board, and vital signs are stable.1 Warmed animals
have higher O2 demands, increased potential for
hemorrhage, and increased bacterial growth in contaminated wounds. Once the turtle is stabilized, radiographs can be taken to determine the extent of
the injuries, prognosis and plan for further therapy.
In cases of hind limb paresis, it is important to rule
out a spinal or pelvic fracture. Pelvic fractures may
predispose female turtles to dystocia; therefore,
these animals should not be released into the wild.
Uncontrolled hemorrhage should be addressed
immediately. This can be accomplished by digital
pressure, a pressure bandage, vessel ligation with
suture, or by surgical electrocautery. Carapace and
plastron fractures are common in chelonians. After
radiographic evaluation, the fracture site and surrounding tissue should be cleaned with dilute chlorhexidine, betadine, or saline. A wet-to-dry bandage
may be placed over the injury to further decontaminate the wound. Foreign debris should be carefully
removed from the fracture site. If the coelomic cavity
is open, minimize contamination. Fractures of the
carapace over the lungs or of the bridge may put the
117
Chelonian Emergency and Critical Care
patient at risk for bacterial and fungal pneumonia.
After cleansing, the shell fracture should be reduced. If realignment is difficult or a spinal injury is
suspected, then fracture alignment should be approached with caution or delayed. After cleansing
and drying the fracture, the wound should be
dressed. Silver sulfadiazine (SSD) cream or triple
antibiotic ointment are applied to open shell fractures and wounds. The author recommends covering open wounds and shell fractures with a silvercoated mesh (Acticoat with silcryst nanocrystals,
Smith & Nephew, Inc., Largo, FL USA). This product provides 72 hours of antibacterial and antifungal
activity; however, it must be kept moist with sterile
water while being used. DuoDerm or tegaderm can
be used to cover various dressing materials and keep
the wound clean and dry. For a more waterproof
bandage, tissue glue can be applied to the edges of
the adherent bandages. Vet wrap (3-M Corp., St.
Paul, MN USA) can be used to keep the dressing in
place and stabilize the fracture. Aquatic species
should be kept in shallow water or may need to be
dry docked until a waterproof bandage is placed over
the wound or fracture or until final repair. Shell
fracture repair methods have been described previously.1,26
All skin wounds should be cleaned and debrided
as described for shell injuries. Primary closure
should be reserved for noncontaminated wounds.
Contaminated wounds should be left open to heal by
second intention or closed using a delayed technique once the wound has been decontaminated.
Reptiles produce thick caseous abscesses. Because
these abscesses do not drain well, penrose drains are
generally not used for wound care. In areas that are
difficult to bandage, suture loops can be placed
around the wound, the preferred topical treatment
and dressing applied, and umbilical tape placed
through the suture loops and tied together like a
shoelace to hold the dressing in place. This method
allows for regular wound cleaning and bandaging.
Fractured limbs in chelonians may result as a
consequence to a variety of traumatic insults, such as
being hit by a car or boat, being dropped, or having
excessive force applied to the limbs when extricating
them for tube feeding. Chelonians suspected to have
metabolic bone disease should be handled with caution, as they are predisposed to pathological fractures. Patient stabilization takes priority over permanent fracture repair. Various methods or combinations of methods may be used to repair a long bone
fracture in a chelonian. Several excellent reviews are
available on chelonian and reptile orthopedic procedures.26
Vomiting, Ileus, Obstruction
Vomiting or regurgitation in chelonians is usually
indicative of a poor prognosis.32 A thorough diagnostic work up should be performed to make a
definitive diagnosis. Some causes of vomiting include foreign body or other gastrointestinal obstruction, noxious tasting materials, dehydration and debilitation, gastric stasis, gastrointestinal yeast, and
parasitism. Vomiting is more common in anorectic
and debilitated turtles than tortoises.1 Turtles should
be rehydrated and stabilized first, and then tube fed
with an easily digestible elemental diet such as Peptamen (Nestle USA, Inc., Deerfield, IL USA). The
neck should be extended and the turtle held in a
vertical position after the tube is removed to prevent
regurgitation. Higher caloric diets should be introduced gradually.
Heavily parasitized turtles and tortoises may become partially or completely obstructed with nematodes after being dewormed with relatively low doses
of fenbendazole (30 mg/kg PO once).11 These patients should be rehydrated and stabilized to ensure
that they regain their normal gastrointestinal motility. To prevent this complication, always start debilitated chelonians with lower doses of anthelminthics
(fenbendazole) and gradually increase the dose to
the recommended levels of 50 mg/kg over several
weeks. The gradual increase in dosage reduces the
chance of obstruction by reducing the number of
parasites affected per treatment. Fenbendazole, although effective in chelonian species, should be
used with caution based on recently described bone
marrow suppression effects avian species.80 Pyrantel
pamoate may be a safer alternative anthelminthic to
use in debilitated chelonians.
Gastrointestinal stasis or ileus is a common cause
of morbidity in debilitated chelonians and must be
differentiated from obstruction. Gastrointestinal stasis is precipitated by dehydration, systemic disease,
dietary indiscretion, decreased dietary fiber, malnutrition, suboptimal management practices, and seasonal motility changes.81 Diagnosis is challenging
because of difficulties in palpating the chelonian
coelomic cavity and the normally slow GI transit time
of these animals. Without appropriate treatment, the
condition may progress to impaction and obstruction
require intensive medical or surgical therapy.82 Debilitated marine turtles often develop a secondary gastrointestinal stasis and become obstructed with nondigestible prey materials. Radiopaque material and gas
in the gastrointestinal tract are visible radiographically. This condition can be resolved with fluid therapy, mineral oil, enemas, and gastrointestinal motility modifiers. The obstruction should be resolved
118
before offering the animal food. In other chelonians, elucidating the cause of the ileus, correcting the
medical problem, and providing supportive care will
usually resolve the ileus. Motility modifying drugs,
such as metoclopramide and cisapride, are clinically
effective in chelonians.82,83
Foreign body ingestion is a common emergency
presentation in chelonians.83-87 Occasionally foreign
bodies are found incidentally on whole body radiographs. In aquatic species, fishhooks with attached
fishing line may become anchored in the oral cavity,
esophagus, or other parts of the gastrointestinal
tract. These foreign bodies frequently lead to intestinal plication or coelomitis secondary to penetration of the serosal surface of the gastrointestinal
tract. A variety of foreign materials, such as plastic
bags, metal, and glass, have been found in marine
turtle gastrointestinal tracts and may be an incidental finding or lead to an enteritis or obstruction.
Ingestion of substrates such as corncob, wood chips,
gravel, sand, kitty litter, or walnut shell by captive
terrestrial chelonians may cause GI obstruction.32
The radiographic hallmark sign for intestinal obstruction is the accumulation of radiopaque material
in a dilated segment of intestine. A prominent obstructive gas pattern is not always observed. Conservative medical treatment consisting of enemas, parenteral fluids, petroleum laxatives and water given
via a stomach tube (15 mL/kg) may be all that is
necessary for clinical resolution.88 However, surgical
removal of the foreign body or material may be
required in some cases.83,89,90
Hypothermia
Hypothermia, or cold stunning, in sea turtles is a
wintertime phenomenon where the water temperature suddenly drops below 50°F (10°C).29 The turtles
lose their ability to swim and dive, become buoyant
and float to the surface. It is most common in juvenile sea turtles, and has been documented to occur
from the Gulf of Mexico to New England and Western Europe. Hypothermia is also a common problem
in other chelonian species. Common causes of hypothermia may include escape from a heated enclosure, airline transport, power or heating element
failure, and an unexpected drop in nighttime temperatures.32 Hypothermia has been investigated
more thoroughly in sea turtles; however, similar
medical management can be applied to other chelonians. Secondary infections, especially bacterial
pneumonias, are not uncommon and may not be
apparent until several weeks after the initial hypothermic event.32
Terry M. Norton
A classification system has been developed for
hypothermic sea turtles based on a series of reflex
responses, including head lift, cloacal or tail touch
reflex, eye touch reflex, and nose touch reflex.91 The
degree of responsiveness can be used to dictate the
best approach to be taken and approximate a prognosis. The severity of secondary problems often depends on the length of time the animal has been
debilitated and the temperature extremes the turtle
was exposed to. Traumatic wounds, dehydration,
corneal ulcerations, dermal, carapacial and plastron
lesions, flipper tip necrosis consistent with frostbite,
and buoyancy disorders are frequent findings in severe cases.29 Other chelonian species often present
with similar clinical signs, including lethargy, poor
response to external stimuli, and in extreme cases
evidence of frostbite of digits and tail tips.29
Common abnormal clinical pathology findings in
cases of hypothermia include an initial heterophilic
leukocytosis with subsequent development of leukopenia and monocytosis, both regenerative and nonregenerative anemias, hypoglycemia or hyperglycemia, increased creatine phosphokinase (CPK), decreased blood urea nitrogen (BUN), hypocalcemia,
hypoproteinemia, hypokalemia, hypernatremia, hyperchloremia, and metabolic acidosis.29 Electrolyte
disturbances may be secondary to malfunctioning
salt glands. Cultures of blood and other fluids often
reveal localized and systemic bacterial and fungal
infections. Radiographs often reveal changes consistent with pneumonia. Coelomic fluid evaluation may
reveal evidence of inflammation or infection.29
The therapeutic plan for hypothermic sea turtles
should include a slow increase in body temperature,
gradual reintroduction to sea water from fresh and
brackish water over a 2 week period, prophylactic
antibiotic and antifungal therapy, nutritional support, and close monitoring of clinical pathology and
acid-base abnormalities.29 Many turtles can have positive clinical outcomes with proper medical attention. Body temperature and heart rate are important
parameters to obtain at the time of presentation, and
to monitor until the rewarming process is complete.
Less severe cases are placed in shallow water, while
more severe cases are dry-docked and placed on
foam pads. The water or room temperature should
initially be only 4-6°F (2-4°C) warmer than the ambient water temperature where the turtle was found.
Body temperature should be increased by 5°F (3°C)
per day until reaching 75°F (24°C). Broad-spectrum
systemic antibacterial and antifungal therapy should
be initiated when the turtle reaches 60 to 65°F (1619°C). The skin and shell should be kept moist with
bacteriostatic water and soluble lubricating jelly.
119
Chelonian Emergency and Critical Care
Hyperthermia
Reptiles are less able to compensate for elevated
temperatures than mammals or birds. Temperatures
over 100°F (38°C) are usually lethal for most chelonians.32 Hyperthermia in chelonians can occur as a
result of placing a turtle in a glass or plastic tank
outdoors in the sun, a closed car during the day, or
accidental overheating in an enclosure. Ill or injured
chelonians stranded on a beach or road also may
become overheated. Early clinical signs of hyperthermia include increased activity, retreating to the water, seeking cool areas, and hyperemic skin. Eventually, the turtle develops open mouth breathing,
rapid respirations, and may become comatose.32
Treatment should include cooling the animal, administering fluids and possibly, in severe cases, a
short acting steroid to reduce brain swelling.32 The
chelonian should be placed into a shallow pan of
cool water (not cold) for a brief period to reduce the
core body temperature. Body temperature should be
monitored carefully. Subsequently, the turtle should
be placed in a small enclosure at the lower end of its
POTZ.32
Drowning
Despite the chelonian’s ability to survive extended
periods without breathing and having significant anaerobic respiration adaptations,32 drowning is a common problem in the aquatic and terrestrial chelonian. A common cause of drowning in marine turtles
occurs when the animals are incidentally captured or
entangled in shrimp nets or various fishing gear and
subsequently trapped underwater for extended periods of time. Diamondback terrapins (M. terrapin) are
attracted to crab traps and often are unable free
themselves once trapped. Terrestrial chelonians may
be found at the bottom swimming pools.
Live turtles that have been submerged under water for extended periods of time may present in a
comatose state without corneal or deep pain reflexes. The cardiopulmonary resuscitation protocol
described previously should be used in cases where
there is cardiac and respiratory arrest. Trawl-captured loggerhead sea turtles exhibit a marked acidemia and lactic acidosis when first brought on
board.92 Blood gas and lactate levels should be monitored during the recovery process. Once intubated,
the turtle should be placed with its head down to
drain fluid from the lungs. Suctioning fluid from the
endotracheal tube may be of some benefit. Limb and
head pumping, intermittent positive-pressure ventilation (2-6 times per min), and doxapram administration (5-10 mg/kg IV) may assist in reviving the
turtle. Aggressive therapy to correct acidosis, electro-
lyte imbalances, dehydration, and hypothermia may
be necessary. Broad-spectrum antimicrobial therapy
is usually indicated.
Toxicosis
Chelonians can be exposed to a variety of toxins and
contaminants in captivity and the wild. Unfortunately, many of the toxicities that have been documented in captive chelonians are iatrogenic and
induced by the veterinary clinician.93 Ivermectin has
been used successfully and safely in a variety of reptiles; however, it is toxic to many species of chelonians.94 Although there are species differences in susceptibility to the toxic effects of ivermectin, the drug
should be avoided in all chelonians. Clinical signs
associated with ivermectin intoxication are primarily
related to general neuromuscular weakness, and
death usually occurs because of respiratory paralysis.94
Metronidazole is used to treat anaerobic bacterial
infections and amoebiasis in reptiles.1,48 Tortoises
are prone to developing side effects from this drug,
and may not tolerate the relatively high doses or
duration of therapy necessary to treat amoebiasis
effectively.1 Metronidazole treatment regimens in
chelonians need to be tailored to the individual with
close monitoring for clinical signs of toxicity. Clinical signs of metronidazole toxicity include anorexia,
head tilt, circling, dysequilibrium and signs of hepatotoxicity.95 Metronidazole toxicity can be fatal in
chelonians.
Two red-belled short-necked turtles (Emydura subglobosa) with shell lesions were soaked for 45 minutes
in a dilute (0.024%) chlorhexidine solution and subsequently developed partial flaccid paralysis and
died.96 Cholecalciferol toxicity has been reported in
a leopard tortoise (Geochelone pardalis)secondary to
ingesting rodent bait.97 While numerous plant species are suspected to be potentially toxic in chelonians, few published reports have been made on actual
toxicosis.98 Oak toxicity was recently reported as the
suspected cause of death in an African spurred tortoise, Geochelone sulcata.99 Lead poisoning has been
documented in a wild common snapping turtle (Chelydra serpentina) after swallowing a fishing sinker100
and a tortoise after ingesting lead paint chips.101
Central nervous system disease predominated in
these cases. Sea turtles may encounter waters that
contain chemical pollutants, such as petroleum
products from oil spills, and present with oil or tar
on their skin and shell or systemic signs of toxicity
due to ingestion.79 An increased stranding rate of sea
turtles in Florida has been associated with red tide
blooms of the dinoflagellate Karenia brevis. Affected
120
animals often present with central nervous system
deficits.102
A diagnosis of toxicity in a chelonian is usually
based on a thorough history, clinical signs, physical
examination, and various diagnostic tests. The diagnostic tests generally used to confirm a toxic exposure include contaminant analysis of blood, plasma,
stomach contents or tissue, and radiographs. Fluid
therapy, wound care, and other supportive measures
described previously may be used to treat intoxication. In addition, activated charcoal or psyllium may
be used to bind and decrease the absorption of
orally ingested toxins,79 calcium EDTA to treat lead
toxicity,103 midazolam or diazepam93 to control seizures, and atropine to treat organophosphate toxicity.
Nutritional Diseases and the Critically
Ill Chelonian
Some of the more common nutritional diseases that
occur in captive chelonians include generalized cachexia/starvation, metabolic bone disease or secondary nutritional hyperparathyroidism, vitamin A
deficiency, and iodine deficiency/goiter.104-106 These
patients are often immunnocompromised and predisposed to secondary infections. Nutritional hyperparathyroidism or metabolic bone disease is most
common in young growing chelonians and is caused
by deficiencies in calcium, vitamin D, an improper
calcium/phosphorous ratio, lack of exposure to UV
light, or a combination of these factors. Clinical signs
may include a soft deformed shell, limb fractures,
and a malformed overgrown rhampthotheca.106 Radiographs can aid in the diagnosis of advanced cases.
Starvation or cachectic myopathy may occur in
captive and free-ranging chelonians.107,108 In captive
specimens, primary malnutrition and poor husbandry (eg, suboptimal environmental temperatures) are often responsible. Confiscated Southeast
Asian turtles are routinely presented with severe
emaciation after being maintained at suboptimal
conditions for extended periods of time.1 Emaciated
free-ranging chelonians usually have an underlying
problem.108 The underlying cause of the emaciation
may be masked by numerous secondary medical
problems such as bacterial or fungal pneumonia,
septicemia, and severe endoparasitism.108 These turtles may be critically anemic, hypoproteinemic, and
hypoglycemic. They often have severe ascites, serous
atrophy of fat, lymphoid depletion, and bone marrow suppression.
Severely malnourished chelonians may present in
a moribund state and require emergency care. Treatment for energy deficiency in chelonians should
Terry M. Norton
involve fluid and electrolyte replacement initially
and then small but increasing levels of calories. In
addition, iron dextran, whole blood or artificial hemoglobin, broad- spectrum antimicrobial drugs, and
antiparasitics may be necessary. Specific nutritional
problems such as vitamin A deficiency, metabolic
bone disease and hypothyroidism should be treated
once the turtle has been stabilized.
Dystocia
Most dystocias in chelonians do not present as a
medical emergency unless there is an obstructive
process involved. It may be difficult to determine
when a gravid patient is overdue or when one should
intervene. Common causes of dystocia in chelonians
include inadequate nesting sites, inadequate thermal environment, malnutrition, dehydration, poor
muscle tone, endocrine abnormalities, and metabolic abnormalities such as hypocalcemia. A dystocia
is more likely to be a medical emergency when it
occurs secondary to reproductive tract or cloaca prolapses, systemic infections, abnormal egg shape and
size, stricture or torsion of the oviducts, impingement of the pelvic canal from misaligned healed
fractures, uroliths, soft tissue masses, or broken
eggs.109 The dystocia patient may be asymptomatic or
may have one or more of the following clinical signs:
decreased appetite or anorexia, decreased activity
level, excessive basking, restlessness, constant digging behavior, raising the hindquarters accompanied by cloacal aversion, and eventual weakness and
lethargy.109 The diagnostic workup should include a
thorough history, physical examination, and radiographs. Radiographs should be evaluated for the
presence of eggs, the size, shape, and position of
eggs, eggs in the bladder,110 any broken eggs, bone
density, pathological fractures and pelvic fractures,
evidence of constipation, and cystic calculi. Ultrasound, hematology, and a serum chemistry profile
may provide additional important information in
some cases.
Debilitated chelonians suffering from dystocia
should be stabilized before oxytocin therapy or surgery. Dehydration, hypothermia, and hypocalcemia
should be corrected. Antibiotic therapy and nutritional support may be indicated in some cases. It is
important to provide adequate nesting areas, water,
and an appropriate thermogradient during the treatment period.109 In nonobstructive dystocias, the patient may be pretreated with calcium followed by
oxytocin. Eggs should pass within 30 to 60 minute.109
Obstructive dystocias will require surgery in most
cases. If the egg can be visualized through the cloaca,
ovicentesis and collapsing the egg may be attempted.
121
Chelonian Emergency and Critical Care
If surgery is deemed necessary, an inguinal approach
is less invasive and preferred over entering the coelom via a plastron osteotomy. A salpingotomy, salpingectomy, or gonadectomy may be performed depending on the cause of the dystocia and condition
of the oviductal tissue.109 The ovary should always be
removed with the oviduct to prevent ovulation into
the coelomic cavity during the next reproductive
season. A unilateral salpingectomy can be performed to maintain future reproduction.111
irritation or desiccation from substrates while attempting to breed, constipation, or neurologic defects.32 The phallus can be reduced using the same
techniques described for the cloaca. If the phallus is
necrotic, the base of the penis can be double ligated
with two vertical mattress sutures and then amputated.32 Penile amputation will not affect urination but
the turtle will not be able to copulate or reproduce.32
Urolithiasis
Ectoparasites, such as maggots,116 ticks,116 sarcophagid fly larvae,117,118 leeches,119 and various epibiota
found on sea turtles,108,119 may contribute to the
overall poor condition of a critically ill chelonian
and should be manually removed or treated appropriately. Placing marine turtles in freshwater for 24
hours will significantly reduce the parasite load and
aid in rehydration.
Endoparasites may be a contributing factor to
disease in an already compromised chelonian, and
in some cases they may be the primary cause of
debilitation.11,120-129 Stress, overcrowding, poor husbandry, infectious diseases, and immunocompromising conditions may lead to heavy endoparasite infestations. Clinical disease associated with Entamoeba
spp. is much more prevalent in chelonians than
previously recognized.1,120,121 It is a difficult parasite
to identify and treatment may need to be started
before a specific diagnosis is made.1 There are multiple species of amoeba with varying degrees of
pathogenicity.1 The most common clinical signs are
diarrhea, often with intermittent blood and mucous,
anorexia, depression, and severe dehydration. Treatment consists of aggressive fluid therapy and supportive care. Bonner recommends a prolonged
course and high doses of metronidazole (100 to 150
mg/kg sid PO for 5 days, skip 7 days, and then repeat
another 5 day course) due to the difficulties in eradicating this parasite.1 This regimen may be toxic to
tortoises. Recent pharmacokinetic studies in the yellow rat snake and green iguana suggest that a dose of
20 mg/kg every 48 hours reaches therapeutic levels
for treating anaerobic bacterial infections.48,130 Metronidazole eliminates the trophozoites stages, while
iodoquinol can be used to treat the amoebic cyst
stages. Broad-spectrum antimicrobial therapy is often indicated.1
Digenetic trematodes of the family Spirorchidae
are commonly found in the cardiovascular system of
freshwater and marine turtles, and have been implicated as a cause of significant morbidity and mortality in some cases.18,126,127,129 The eggs are released
into the circulatory system, and eventually become
trapped within the terminal arterioles of the visceral
Cystic calculi have been documented in a variety of
captive and wild turtle species.112 The condition is
relatively common in California desert tortoises.
Most cases result from water deprivation or excess
amounts or inappropriate types of dietary protein.113,114 Emergency care should be sought if the
chelonian is straining excessively or develops a prolapse of the uterus or bladder. Treatment should
include rehydrating and stabilizing the patient for a
surgical cystotomy.113
Cloacal and Phallus Prolapses
A cloacal prolapse should be attended to quickly so
that the prolapsed organ remains viable. Cloacal
prolapses usually occur from excessive straining secondary to an inciting cause, which may include constipation, bacterial enteritis, parasitic enteritis, cystic
calculi, egg binding, and other conditions causing
straining.115 In addition to determining the cause of
the prolapse, it is important to determine what structure is protruding and its viability.115 The colon has a
lumen with feces inside and a smooth surface. The
urinary bladder is thin walled, translucent, and urine
may be aspirated from it. The uterus and oviduct
have a lumen, no feces, and longitudinal striations
on the surface.
Treatment for a cloacal prolapse should include
cleaning, lubricating, and replacing the viable tissue
back through the vent. Soaking the prolapse in 50%
dextrose will reduce the edema to facilitate replacement. A purse string or transverse suture should be
used to maintain the reduction. The vent can be
surgically enlarged to assist in replacing the prolapsed tissue. In cases of chronic prolapse when the
tissue is edematous and friable, it may be difficult to
impossible to reduce the tissue and instead require a
coeliotomy or amputation. If the colon is prolapsed,
a colopexy can be used to prevent recurrence.115
Chelonians have a large phallus, which is solid
tissue and has no lumen. Phallus prolapses are not
uncommon in chelonians, and may occur secondary
to an infection, forced separation during copulation,
Parasites
122
organs, extremities and shell. A granulomatous response is produced by the eggs in various tissues,
including the gastrointestinal tract, liver, spleen,
lungs and CNS.18,126,127 Clinical signs are related to
the pathology caused by the eggs and may include
generalized debilitation, severe ulcerative colitis, pitted ulcerations (due to ischemic necrosis) of the
carapace and plastron, edematous limbs due to vascular obstruction, and buoyancy problems secondary
to pneumonia. A major loggerhead sea turtle stranding event occurred in south Florida in 2001.129 Most
turtles presented with partial paralysis and many had
secondary problems. Postmortem results revealed
adult trematodes in the brain and spinal cord. No
other primary agent has been identified in these
turtles. These turtles often respond to supportive
care and treatment for the trematodes. Treatment
with high dose of praziquantel may be effective in
decreasing the severity of clinical signs but will not
affect the eggs already in the tissues.131,132
Infectious Disease
Several excellent reviews of infectious diseases in
chelonians have been published.128,133,134 Clinical
signs associated with infectious disease agents may be
severe, present acutely, and warrant emergency care.
Upper respiratory tract disease (URTDS) complex is
a relatively common reason for chelonians to be
presented and provides a good example of dealing
with an infectious disease in an emergency setting.134-141 Herpesvirus, iridovirus and Mycoplasma
agassizii are important infectious diseases of terrestrial chelonians.134-141 Infected chelonians often
present with an acute onset of clinical signs, including anorexia, depression, and nasal and ocular dicharge.134-142 Herpesvirus and iridovirus infected
chelonians frequently present with stomatitis and
glossitis,137,143 whereas this is never observed with M.
agassizii alone.138,140,141 Mixed infections of Herpesvirus and M. agassizii have been reported, further
complicating the diagnosis.144
Herpesviruses have been documented to affect
many chelonian taxa, and all chelonians should be
considered susceptible.134,135,142-148 These infections
are believed to lie dormant in various tissues following the primary infection, and during times of stress,
such as hibernation and illegal importation, recrudesce.134 Herpesvirus infections have been implicated as the causative agent in several diseases of
captive and free-ranging sea turtles.145,147-149 Fibropapilloma disease syndrome (FP) is the most well
studied disease affecting sea turtle populations. A
herpesvirus has been implicated as the causative
agent of the disease syndrome,147-152 however, envi-
Terry M. Norton
ronmental pollutants or other unknown immunosuppressive factors are most likely a contributing
factor in the disease process.153 Turtles may have
multiple cutaneous FPs found on all soft integumentary tissue, but especially in the axillary and inguinal
regions.147 The FPs can develop on the eyelids, conjunctiva, and cornea and may be so extensive as to
impair the turtle’s vision.147 This visual impairment
hinders feeding and leads to emaciation. Furthermore, FPs may be found internally in various organs.152,153 A diagnosis is made by observing typical
skin lesions and histopathology.150 Radiography and
laparascopy are used to identify internal FP. Euthanasia is recommended in turtles with internal lesions. Initial treatment consists of correcting dehydration, hypoglycemia, and malnutrition. Antimicrobial therapy is usually indicated before and after
surgery. Laser surgery can be used to remove the FPs
in stages. In these cases, the skin is often left open to
heal by second intention (Pers. comm. Mader D,
2003).
Iridovirus is an important emerging disease in
chelonians137,154 Until recently, it had only been recognized sporadically.136,155 Frogs are implicated as a
reservoir host capable of infecting captive and freeranging chelonian populations.137 Viral infections in
chelonians are often complicated by secondary bacterial, fungal, and parasitic infections, and should be
considered in the diagnostic and therapeutic approach. Diagnostic samples (eg, serology, cytology,
histopathology, electron microscopy, culture and
PCR) should be collected before initiating treatment.133,137,156
Initial emergency therapy should focus on stabilizing the patient with emergency drugs and rehydration. Critical care may consist of broad-spectrum
antimicrobial therapy for aerobic and anaerobic bacteria, antifungals, antiviral drugs, fluid therapy, and
nutritional support. Acyclovir administered orally
and topically has been shown to be clinically effective against both chelonian herpesvirus and iridovirus infections.137,157
Bacterial and Fungal Infections
Debilitated and injured chelonians often present
with bacterial or fungal infections. These may include infected traumatic injuries, abscesses, stomatitis, shell infections, osteomyelitis, and respiratory
disease. Poor husbandry, malnutrition, and a lack of
sanitary procedures are predisposing factors for infection in captive specimens. Bacterial abscesses are
the most common inflammatory condition in reptiles, and can occur anywhere on the body. Reptile
abscesses are most often well encapsulated by fibrous
123
Chelonian Emergency and Critical Care
connective tissue. Gram-negative bacteria cause the
highest morbidity in chelonians, however, anaerobic
bacteria (eg. Bacteroides spp., Fusobacterium spp., Clostridium spp., and Peptostreptococcus spp.) can cause
serious disease and should be considered in the
therapeutic plan.158 Bacteroides spp. and Fusobacterium
spp. produce potent tissue toxins, which can cause
tissue necrosis and increase the severity of mixed
aerobic and anaerobic bacterial infections.158 Clostridium spp. have systemically active toxins that cause
hemolysis and renal tubular necrosis.158 Salmonella
spp. can cause disease in chelonians and are a potential zoonosis.159 Atypical mycobacterial infections
can cause abscesses, cutaneous and subcutaneous
nodules, osteomyelitis, osteoarthritis, and other
problems in chelonians.160 Predisposing factors include debilitation, injury, malnutrition, and other
disease processes. This is also a potentially zoonotic
disease. Dermatophilus chelonae is a newly discovered
species of bacteria that grows at lower temperatures
than D. congolensis.161,162 Several tortoise and turtle
species have been reported to develop skin abscess,
dermal nodules, ulcerative stomatitis, septic arthritis,
and a granulomatous coelomitis. Middle and inner
ear abscesses are commonly seen in captive and wild
box turtles and other chelonians.163,164 Lesions may
be unilateral or bilateral. A variety of Gram-negative
bacteria have been isolated from most cases, however, anaerobic bacteria, fungal organisms and parasites may be involved.163,164,165 The route of infection may be via the eustachian tube. Organochlorine
toxicity and vitamin A deficiency are predisposing
factors.163
Shell infections can involve the superficial keratin
or may extend into the osteoderms of the carapace
and plastron. Aerobic and anaerobic bacteria and
mycotic agents are commonly isolated. Mucormycosis has been associated with ulcerative epidermitis in
soft-shelled turtles (Trionyx ferox). This is a very serious condition in this group of chelonians because of
the importance of the integument and shell as a site
of oxygen transport and osmotic balance.166 Culture,
cytology, histopathology, and molecular diagnostics
are routinely used to diagnose bacterial and fungal
infections. Special stains, such as acid-fast stains for
Mycobacteria spp., also may be needed to make a
diagnosis.
Treatment for bacterial infections should include
antibiotic therapy based on culture and antimicrobial sensitivity. Anaerobic bacteria should be treated
with metronidazole, penicillin, chloramphenicol, or
clindamycin.158 Because of the caseous nature of
reptile abscesses, complete surgical excision of the
abscess and removal of the accumulated caseous
material are required for effective treatment. Antibiotic-impregnated polymethylmethacrylate beads
have been used to treat osteomyelitis in reptiles.167
The silver mesh described previously can be used to
pack wounds and provides 72 hrs of antibacterial
and antifungal activity. Pharmacokinetic studies involving fluconazole and itraconazole in sea turtles
have advanced the treatment capabilities for fungal
infections.46,51
Pneumonia
Pneumonia is a common problem in critically ill
chelonians.1,168 Suboptimal temperatures, increased
humidity, malnutrition, and overcrowding are predisposing factors for pneumonia.1,168 Because reptiles tolerate an anaerobic environment, they can
conceal clinical signs of pneumonia until the condition is severe.168 Pneumonia can be caused by a wide
array of infectious diseases. Gram-negative bacteria
are recovered from a large percentage of the cases.
These are often opportunistic infections with the
same bacteria being considered normal flora in the
healthy chelonian.168 Anaerobic bacteria are more
difficult to culture, but do represent an important
cause of pneumonia.158 Although less commonly isolated, atypical bacteria such as Mycoplasma spp.,
Chlamydiophila spp., and Mycobacterium spp. are also
important pathogens to consider.168,169 Herpesviruses have been implicated as a cause of respiratory
disease in several chelonian species,134,145 and may
predispose the patient to secondary bacterial and
fungal infections.
Chelonians appear to be more susceptible to fungal pneumonia than other reptile orders.1,128,170,171
Over exposure to fungal spores, immunosuppression, or overuse of antibiotics are predisposing factors. Aspergillosis spp., Candida spp., Mucor spp.,
Geotrichum spp., Penicillium spp., Cladosporium spp.,
Rhizopus spp., Beauveria spp., Sporotrichum spp., Basidiobolus ranarum and Paecilomyces spp. have all been
isolated from chelonians with pneumonia.128,170-172
Migrating nematode parasites and digenetic spirorchid trematodes may predispose the chelonian to
bacterial or fungal pneumonia.127,129 Aspiration
pneumonia may occur in debilitated chelonians.168
Clinical signs may include anorexia, lethargy, increased or abnormal respiratory sounds, increased
respiratory rate (especially at rest), and asymmetric
floating in aquatic species.168 Abnormal posture may
also be noted in cases of inspiratory and/or expiratory dyspnea, which may manifest itself as labored
breathing with the neck extended and mouth
open.168
124
Diagnosis of pneumonia is based on history, physical examination, and horizontal beam anterior-posterior and lateral radiographic views.168 A tracheal
wash should be performed before starting therapy if
the patient can tolerate the procedure.168 Sedation
may be necessary. A sterile red rubber catheter or
bronchoscope is placed through the glottis, down
the trachea, through a bronchus and into the lung.
If the pneumonia is determined to be unilateral
based on the radiographic findings, then treatment
can be targeted to that lung. Sterile saline solution
should be flushed through the catheter and then
aspirated back. Bronchoscopy is limited to larger
patients, but will allow visualization of the respiratory
tract and collection of appropriate samples. Cytology
and culture should be performed on samples obtained from the pulmonic lavage. Fungal pneumonias often produce localized or diffuse granulomatous nodules, which makes recovery of the organism
difficult without a biopsy. Nodules noted on radiographs may be suggestive of fungal involvement.168,172,173
Treatment for a fungal pneumonia should include minimizing stress, providing a positive nutritional balance, and maintaining hydration.1 Patients in extreme respiratory distress from pneumonia should be positioned on a slight incline
with their head and forelimbs extended.1 The animal can be intubated to facilitate suction of debris
from the lower respiratory tract. Coupage may be
helpful in bringing up debris to be suctioned.
Supplemental oxygen may inhibit respiration and
compromise the chelonian’s limited ability to
eliminate inflammatory debris.1 Oxygen supplementation should be humidified to avoid irritation
of the respiratory system.168 Bacterial pneumonia
should be managed with broad-spectrum antibiotics. Nebulization therapy can be used to increase
the humidity of the respiratory epithelial microenvironment, improve pulmonary hydration, and increase the mucociliary transport mechanism.1,168
Furthermore, it assists in breaking up necrotic and
inflammatory debris and delivers antimicrobials
directly to the site.
Treatment of fungal pneumonia in chelonia is
difficult and often unsuccessful. Some authors advocate prophylactic antifungal therapy in susceptible
species.1 Medical management generally consists of
oral or subcutaneous fluconazole51 or itraconazole.46
Amphotercin B may also be used, and can be delivered directly into an affected lung via a catheter
placed through a carapacial osteotomy.171,174 Granulomatous nodules may require surgical excision.168
Terry M. Norton
Acyclovir therapy is indicated when herpesvirus is
diagnosed or suspected.
Buoyancy Disorders
Aquatic turtles, especially sea turtles, are often
presented with buoyancy disorders, where they are
unable to float normally at the surface or submerge.79 Any condition leading to gas or air accumulation in a body organ or in the coelomic cavity
may cause abnormal buoyancy. Common causes of
this condition include 1) pneumonia, 2) gastrointestinal disease (eg, motility disorders, spinal cord
injury, foreign body and other obstructive processes leading to gas accumulation), and 3) free
air in the coelomic cavity (respiratory or intestinal
leakage or microbial fermentation). Efforts should
be directed toward diagnosing the primary problem, which may include blood work, radiology,
endoscopy and laparoscopy. Initially the turtle
should be stabilized and then attempts should be
made to treat the primary disease. Laparoscopic
surgery has been used to repair a lung tear in a sea
turtle (Pers comm, Dover S, 2004). Intracoelomic
administration of large volumes of sterile fluids
has been used as an ancillary treatment for this
condition in loggerhead sea turtles (Pers comm,
Sheridan, T, 2005). Some turtles, especially those
with spinal injuries, may remain abnormally buoyant for life.
Septicemia
Bacterial septicemia is a relatively common sequellae to more localized infections. Multiple Gramnegative bacteria are commonly cultured; however, anaerobic bacteria and fungal organisms may
also be isolated.1,175 Clinical signs may include anorexia, lethargy, weakness, red-purple oral mucous
membranes, and general malodor of the turtle.1
Petechial hemorrhages occur initially along marginal scutes and then develop into larger areas of
hemorrhage.1 Hemorrhage across the bridge is a
serious clinical sign and can progress to a disseminated intravascular coagulation (DIC)-like syndrome.1 Successful treatment of sepsis is more
likely if clinical signs are recognized early and
treatment is begun before diagnosis on predisposed turtles. Leaving these patients at the temperature at which they were received for 72 hrs
should be considered as a therapeutic option because warming the patient will facilitate bacterial
proliferation.1 Administer room-temperature fluids and IV broad-spectrum antibiotics while the
patient is still cool, and then gradually warm the
125
Chelonian Emergency and Critical Care
patient over a 48 hour span while continuing therapy.1
18.
References
19.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Bonner BB: Chelonian therapeutics. Vet Clin of
North Am Exotic Animal Practice 3:257-332, 2000
Ernst CH, Lovich JE, Barbour RW: Introduction, in
Ernst CH, Lovich JE, Barbour BW (eds): Turtles of
the United States and Canada. Washington, DC,
Smithsonian Institution Press, 1994, p xviii
Crouse DT, Crowder LB, Caswell HA: A stage-based
population model for loggerhead sea turtles and
implications for conservation. Ecology 68:1412,
1987
Barrows M, McArthur S, Wilkinson: Diagnosis, in
McArthur S, Wilkinson R, & Meyer J (eds): Medicine and Surgery of Tortoises and Turtles. Ames, IA,
Blackwell Publishing, 2004, pp 109-140
Divers SJ: Basic reptile husbandry, history taking
and clinical examination. In Practice 18:51-58, 1996
McArthur S, Meyer J, Innis C: Anatomy and Physiology, in McArthur S, Wilkinson R, Meyer J (eds):
Medicine and Surgery of Tortoises and Turtles.
Ames, IA, Blackwell Publishing, 2004, pp 35-72
McArthur S: Veterinary Management of Tortoises
and Terrapins, Oxford, Blackwell Science, 1996
Bennet RA: Anesthesia and analgesia. Sem Avian
Exotic Pet Med 7:30-40, 1998
Bailey JE, Pablo LS: Anesthetic monitoring and
monitoring equipment in small exotic pet practice,
in Fudge AM (ed): Sem Avian and Exotic Pet Med
Philadelphia, PA, Saunders, 1998, pp 53-60
Malley AD: Reptile anesthesia and the practicing
veterinary surgeon, In Practice 19:351-370, 1997
Norton TM, Lung N, Tabaka C, et al. Medical management of Manouria emys emys confiscated from
Hong Kong, in: 2003 Scientific Proceedings, Annual Conference of the IUCN Turtle Survival Alliance. Orlando Florida, IUCN Turtle Survival Alliance, 2003
Muro J, Cuenca R, Pastor J, et al: Effects of lithium
heparin and tripotassium EDTA on hematologic
values of Herman’s tortoises (Testudo hermanni). J
Zool Wildl Med 29:40-44, 1998
Redrobe S, MacDonald J: Sample collection and
clinical pathology of reptiles. Vet Clin North Am
(Exotic An Pract) 2:709-730, 1999
Martinez-Silvestre A, Perpinan D, Marco I, et al:
Venipuncture technique of the occipital venous sinus in freshwater aquatic turtles. J Herpetol Med
Surg 12(4):31-32, 2002
Lloyd M, Morris P: Chelonian venipuncture techniques. Bull Assoc Reptil Amphib Vet 9:26-29, 1999
Jacobson ER: Blood collection techniques in reptiles: laboratory investigations, in Fowler ME, Miller
RE (eds): Zoo & Wild Animal Medicine: Current
Therapy 3. Philadelphia, PA, WB Saunders Co,
1993, pp 144-152
Hernandez-Divers SM, Hernandez-Divers SJ,
Wyneken J: Angiographic, anatomic and clinical
technique descriptions of a subcarapacial venipuncture site for chelonians. J Herpetol Med Surg 12(2):
32-37, 2002
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
Innis CJ, Kincaid AL: Bilateral calcium phosphate
ureteroliths and spirorchid trematode infection in a
red-eared slider turtle, Trachemys scripta elegans, with
a review of the pathology of spirorchiasis. Bull Assoc
Reptil Amphib Vet 9:32-35, 1999
Lopez-Olivera JR, Montane J, Marco I, et al: Effect
of venipuncture site on hematologic and serum
biochemical parameters in marginated tortoises
(Testudo margtinata). J Wildl Dis 39:830-836, 2003
Crawshaw GJ, Holz P: Comparison of plasma biochemical values in blood and blood lymph mixtures
from red-eared sliders, Trachemys scripta elegans. Bull
Assoc Reptil Amphib Vet 9:13-15, 1996
Taylor SK, Citino SB, Zdziarski JM, et al: Radiographic anatomy and barium sulfate transit time of
the gastrointestinal tract of the leopard tortoise. J
Zool Wildl Med 27:180-186, 1996
Silverman S, Janssen DL: Diagnostic Imaging, in
Mader DR (ed): Reptile Medicine and Surgery.
Philadelphia, PA, WB Saunders, 1996, pp 258-263
Wilkinson R, Hernandez-Divers S, Lafortune M, et
al: Diagnostic imaging techniques, in McArthur S,
Wilkinson R, & Meyer J (eds): Medicine and
Surgery of Tortoises and Turtles. Ames, IA, Blackwell Publishing, 2004, pp 187-208
Meyer J: Gastrographin as a gastrointestinal contrast
agent in the Greek tortoise (Testudo hermanni). J
Zoo Wildl Med 29:183-189, 1998
De Shaw B, Schoenfeld A, Cook RA, et al: Imaging
of reptiles: A comparison study of various radiographic techniques. J Zoo Wildl Med 27:364-370,
1996
Mitchell, MA: Diagnosis and management of reptile
orthopedic injuries, Vet Clin North Am (Exotic An
Pract) 5:97-114, 2000
McArthur S: Feeding techniques and fluids: in
McArthur S, Wilkinson R, Meyer J (eds): Medicine
and Surgery of Tortoises and Turtles. Ames, IA,
Blackwell Publishing, 2004, pp 257-272
Prezant RM, Jarchow JL: Lactated fluid use in reptiles: Is there a better solution? in 1997 Scientific
Proceedings, annual Conference of the Association
of Reptile and Amphibian Veterinarians. Houston,
Texas, Association of Reptile and Amphibian Veterinarians, 1997, pp 83-87
Turnbull BS, Smith CR, Stamper MA: Medical implications of hypothermia in threatened Loggerhead (Caretta caretta) and endangered Kemp’s Ridley (Lepidochelys kempi) and Green (Chelonia mydas)
sea turtles, in: 2000 Scientific Proceedings, Annual
Conference of the American Association of Zoo
Veterinarians Conference. New Orleans, LA, 2000,
pp 31-35
Wilkinson R: Therapeutics, in McArthur S, Wilkinson R, Meyer J (eds): Medicine and Surgery of
Tortoises and Turtles. Ames, IA, Blackwell Publishing, 2004, pp 465-503
Wack RF, Anderson NL: Resuscitation of a Hispaniolan slider, Trachemys decorata, using Oxyglobin®
and a blood transfusion J Herpetol Med Surg 14:4,
2004
Boyer TH: Emergency care of reptiles, Vet Clin of
North Am (Exotic Anim Prac) 1:191-206, 1998
Whitaker BR, Krum H: Medical management of sea
turtles in aquaria, in Fowler ME, Miller RE (eds):
126
Terry M. Norton
Zoo & Wild Animal Medicine 4th
ed. Philadelphia, PA, WB
49.
Saunders, 1999, pp 217-231
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
Rosskopf WJ: Disorders of reptilian leukocytes and
erythrocytes, in Laboratory Medicine: Avian and
Exotic Pets Fudge AM (ed), Philadelphia, PA, WB
Saunders Co, 2000, pp 198-204
Divers SJ: Emergency care of the critically ill reptile,
in 1997 Scientific Proceedings, Annual Conference
of the Association of Reptilian and Amphibian Veterinarians. Houston, Texas, Association of Reptile
and Amphibian Veterinarians, 1997, pp 153-162
McCracken H, Hyatt AD, Slocombe RF: Two cases
of anemia in reptiles treated with blood transfusion
(1) hemolytic anemia in a diamond python caused
by an erythrocytic virus, (2) nutritional anemia in a
bearded dragon, in 1994 Scientific Proceedings, Annual Conference of the American Association of
Zoo Veterinarians. Pittsburgh, PA, American Association of Zoo Veterinarians, 1994, pp 47-51
Mader DR: Trauma management in reptiles and
amphibians. Proc NA Vet Conf 10:742-743, 1997
Wellehan JFX, Lafortune M, Gunkel C, et al: Coccygeal vascular catheterization in lizards and crocodilians. J Herpetol Med Surg 14:26-28, 2004
Mader, DR, Schaff S, Moretti R, et al: Intracoelomic
catheters in sea turtles, in 2002 Scientific Proceedings, Annual Conference of the Association of Reptilian and Amphibian Veterinarians. Reno, NV, Association of Reptilian and Amphibian Veterinarians
2002, pp 31-32
Innis C: IME-Per-cloacal worming of tortoises. Bull
Assoc Rept Amph Vet 5:4, 1995
Jarchow JL: Hospital care of the reptile patient, in
Jacobson E, Kollias G Jr (eds): Contemporary Issues
in Small Animal Practice 9: Exotic Animals. New
York, Churchill Livingstone, 1988, p 59
Caligiuri R, Kollias GV, Jacobson E, et al: The effects
of ambient temperature on amikacin pharmacokinetics in gopher tortoises. J Vet Pharmacol Ther
13:287-291, 1990
Jacobson ER, Harman G, Laille E, et al: Plasma
concentrations of praziquantel in loggerhead sea
turtles Caretta caretta following oral administration
of single & multiple doses. Am J Vet Res 64:304-309,
2003
Lawrence K, Muggleton PW, Needham JR: Preliminary study on the use of ceftazidime, a broad spectrum cephalosporin antibiotic, in snakes. Res Vet
Sci 36:16-20, 1984
Stamper MA, Papich MG, Lewbart GA, et al: Pharmacokinetics of ceftazidime in loggerhead sea turtles (Caretta caretta) after single intravenous and
intramuscular injections. J Zoo Wildl Med 30:32-35,
1999
Manire CA, Rhinehart HL, Pennick GJ, et al: Plasma
concentrations of itraconazole after oral administration in Kemp’s Ridley sea turtles, Lepidochelys
kempi. J Zool and Wildl Med 34:171-178, 2003
Wimsatt J, Johnson J, Mangone BA, et al: Clarithromycin pharmacokinetics in the desert tortoise. J
Zoo Wildl Med, 30:36-43, 1999
Kolmstetter CM, Frazier D, Cox S, et al: Pharmacokinetics of metronidazole in yellow rat snakes,
Elaphe obsolete quadrivittata. J Herpetol Med Surg
11:4-8, 2001
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
Prezant RM, Isaza R, Jacobson ER: Plasma concentrations with disposition kinetics of enrofloxacin in
gopher tortoises (Gopherus polyphemus). J Zoo Wildl
Med 25:82-87, 1994
Raphael BL, Papich M: Cook RA. Pharmacokinetics
of enrofloxacin after a single intramuscular injection in Indian star tortoises (Geochelone elegans). J
Zoo Wildl Med 25:88-94, 1994
Mallo K, Harms CA, Lewbart GA, et al: Pharmacokinetics of fluconazole in loggerhead sea turtles
(Caretta caretta) after single intravenous and subcutaneous injections, and multiple subcutaneous injections. J Zoo Wildl Med 33:29-35, 2002
Holz P, Barker IK, Crawshaw GJ, et al: The anatomy
and perfusion of the renal portal system in the
red-eared slider (Trachemys scripta elegans). J Zoo
Wildl Med 28:386-393, 1997
James SB, Calle PP, Raphael BL, et al: Comparison
of injection versus oral enrofloxacin pharmacokinetics in red-eared slider turtles, Trachemys scripta
elegans. J Herpetol Med Surg, 13:5-10, 2003
Holtz P, Barker IK, Burger JP, et al: The effect of the
renal portal system on pharmacokinetic parameters
in the red-eared slider (Trachemys scripta elegans). J
Zoo Wildl Med 28:386-393, 1997
Beck K, Loomis M, Lewbart G, et al: Preliminary
comparisons of plasma concentrations of gentamicin injected into the cranial and caudal limb musculature of the Eastern box turtle, (Terrapene carolina carolina). J Zool Wildl Med 26:265-268, 1995
Hernadez-Divers SJ: Single-dose oral and intravenous pharmacokinetics of meloxicam in the green
iguana, in 2004 Scientific Proceedings, Annual Conference of the Association of Reptilian and Amphibian Veterinarians, Naples, FL, 2004, pp 106-107
McArthur S: Anaesthesia, analgesia, and euthanasia,
in McArthur S, Wilkinson R, & Meyer J (eds): Medicine and Surgery of Tortoises and Turtles. Ames,
IA, Blackwell Publishing, 2004, pp 379-401
Norton TM, Spratt J, Behler J, et al: Medetomidine
and ketamine anesthesia with atipamezole reversal
in private free ranging tortoises Gopherus polyphemus,
in 1998 Scientific Proceedings, Annual Conference
of the Association of Reptilian and Amphibian Veterinarians. Kansas City, MO, Association of Reptile
and Amphibian Veterinarians, 1998, pp 25-27
Lock BA, Heard DJ, Dennis P: Preliminary evaluation of medetomidine/ketamine combinations for
immobilization and reversal with atipamezole in
three tortoise species. Bull Assoc Reptil AmphibVet
8:6-9, 1998
Bennett, RA: Review article: A review of anesthesia
and chemical restraint in reptiles. J Zoo Wildl Med
22(3):282-303, 1991
Page, CD: Current reptilian anesthesia procedures,
in Fowler ME, Miller RE (eds): Zoo & Wild Animal
Medicine: Current Therapy 3. Philadelphia, PA, WB
Saunders Co, 1993, pp 140-143
Holz P, Holtz RM: Evaluation of ketamine, ketamine/xylazine, and ketamine/midazolam anesthesia in red-eared sliders. J Zoo Wildl Med 25:531-537,
1994
Oppenheim YC, Moon PF: Sedative effects of midazolam in red-eared slider turtles. J Zoo Wildl Med
26:409-413, 1995
127
Chelonian Emergency and Critical Care
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
83.
Rooney MB, Levine G, Gaynor J, et al: Sevoflurane
anesthesia in desert tortoises (Gopherus agassizii). J
Zool and Wildl Med 30:64-69, 1999
Sleeman JM, Gaynor J: Sedative and cardiopulmonary effects of medetomidine and reversal with atipamezole in desert tortoises. J Zoo Wildl Med 31:
28-35, 2000
Dennis PM, Heard DJ, et al: Cardiopulmonary effects of a medetomidine-ketamine combination administered intravenously in gopher tortoises. J Am
Vet Med Assoc, 220:1516-1519, 2002
Bennet RA, Divers SJ, Schumacher J, et al: Roundtable-Anesthesia. Bull Assoc Reptil Amphib Vet
9:20-27, 1999
Mader DR: Understanding local analgesics: Practical use in the green iguana (Iguana iguana), in
1998 Scientific Proceedings, Annual Conference of
the Association of Reptilian and Amphibian Veterinarians. Kansas City, MO, Association of Reptile
and Amphibian Veterinarians, 1998, pp 7-10
Chittick EJ, Stamper MA, Lewbart GA, et al: Medetomidine, ketamine, and sevoflurane for anesthesia of injured loggerhead sea turtles: 13 cases (19962000). J Amer Vet Med Assoc 221:1019-1025
Smith C: Desert tortoise care. Bull Assoc Reptil
Amphib Vet 4:13-15, 1994
Boyer DM, Boyer TH: Tortoise care. Bull Assoc
Reptil Amphib Vet 4:16-27, 1994
Boyer TH, Boyer DM: Aquatic turtle care. Bull Assoc Reptil Amphib Vet 2:13-17, 1992
Boyer TH: Box turtle care. Bull Assoc Reptil Amphib Vet 2:9-14, 1992
Higgins BM: Sea Turtle Husbandry, in Lutz PL,
Musick JA, Wyneken J (eds): The Biology of Sea
Turtles Volume II, Boca Raton, FL, CRC Press,
2003, pp 411-440
Gurley R: Keeping and Breeding Freshwater Turtles. Ada, OK, Living Art Publishing, 2003, pp 1-297
McArthur S: Hospitalization: in McArthur S, Wilkinson R, & Meyer J (eds): Medicine and Surgery
of Tortoises and Turtles. Ames, IA, Blackwell Publishing, 2004, pp 239-255
Abrahams R: Housing reptiles in the veterinary hospital. Bull Associ Reptil Amphib Vet 3:6, 1993
Wright K: IME-Two Products Useful for Tube-feeding Herbivorous Reptiles. Bull Assoc Rept Amph
Vet 7:5-6,1997
Adkins E, Driggers T, Ferguson G, et al: Ultraviolet
light and reptiles, amphibians, Roundtable. Bull
Assoc Reptil Amphib Vet 13:27-37
Campbell T: Sea turtle rehabilitation, in Mader DR
(ed): Reptile Medicine and Surgery. Philadelphia,
PA, WB Saunders, 1996, pp 427-436
Howard LL, Papendick R, Stalis IH, et al: Benzimidazole toxicity in birds, in 1999 Scientific Proceedings, Annual Conference of the American Association of Zoo Veterinarians. Columbus, Ohio, American Association of Zoo Veterinarians 1999, p 36
Boyer TH: Turtles, Tortoises, and Terrapins, in
Mader DR (ed): Reptile Medicine and Surgery.
Philadelphia, PA, WB Sauders, 1996, pp 332-335
Tothill A, Johnson JD, Wimsatt J, et al: Effect of
cisapride, metoclopramide, and erythromycin on
gastrointestinal transit time in the desert tortoise.
J Herpetol Med and Surg 10:16-20, 2000
84.
85.
86.
87.
88.
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
Helmick KE, Bennett RA, Ginn P, et al: Intestinal
volvulus and stricture associated with a leiomyoma
in a green turtle (Chelonia mydas), J Zoo Wildl Med
31:221-227, 2000
McArthur S: Problem-solving approach to conditions of marine turtles: in McArthur S, Wilkinson R,
Meyer J (eds): Medicine and Surgery of Tortoises
and Turtles. Ames, IA, Blackwell Publishing, 2004,
pp 301-307
Jaeger GH, Wosar MA, Harms CA, et al: Use of a
supraplastron approach to the coelomic cavity for
repair of an esophageal tear in a loggerhead turtle.
J Am Vet Med Assoc 223:353-355, 2003
Schumacher J, Papendick R, Herbst L, et al: Volvulus of the proximal colon in a hawksbill turtle (Eretmochelys imbricata). J Zoo Wildl Med: 27:386-391,
1996
Reidarson TH, Jantsch CA, Gendron SM: Medical
treatment for multiple foreign objects in a hawksbill
turtle (Eretmochelys imbricata). J Zoo Wildl Med 25:
158-160, 1994
Boyer TH: Emergency care of reptiles. Sem Avian
Exotic Pet Med 3:210-216, 1994
Gould WJ, Yaegar AE, Glennon JC: Surgical correction of an intestinal obstruction in a turtle. J Amer
Vet Med Assoc 200:705-706, 1992
Lloyd CG: Surgical management of colon prolapse
and subsequent stricture in a Mediterranean spurthighed tortoise, Testudo graeca. J Herpetol Med
Surg 13:10-13, 2003
Sandove SS, Pisciotta R, DiGiovanni R: Assessment
and initial treatment of cold-stunned sea turtles.
Chelon Conserv Biol 3:84-87, 1998
Harms CA, Mallo KM, Ross PM, et al: Venous blood
gases and lactates of wild loggerhead sea turtles
(Caretta caretta) following two capture techniques. J
Wildl Dis 39:366-374, 2003
Wellehan JFX, Gunkel CI: Emergent diseases in
reptiles. Sem Avian Exotic Pet Med, 13:160-174,
2004
Teare JA, Bush M: Toxicity and efficacy of ivermectin in chelonians. J Am Vet Med Assoc 183:11951197, 1983
Wilkinson R: Formulary, in McArthur S, Wilkinson
R, Meyer J (eds): Medicine and Surgery of Tortoises
and Turtles. Ames, IA, Blackwell Publishing, 2004, p
497
Lloyd M: Chlorhexidine toxicosis from soaking redbellied short-necked turtles, Emydura subglobosa.
Bull Assoc Reptil Amphib Vet 6:6-7, 1996
Duhr D: Poisoning due to an intake of mice bait
with cholecalciferol in combination with acute egg
binding in a tortoise. Praktische Tierarzt 79:210212, 1998
McArthur S: Appendices, Plants said to be poisonous to chelonians: in McArthur S, Wilkinson R,
Meyer J (eds): Medicine and Surgery of Tortoises
and Turtles. Ames, IA, Blackwell Publishing, 2004,
pp 511-513
Rotstein DS, Lewbart GA, Hobbie K, et al: Suspected oak Quercus toxicity in an African spurred
tortoise, Geochelone sulcata. J Herpetol Med Surg
13:20-21, 2003
Borkowski R: Lead poisoning and intestinal perfo-
128
102.
103.
104.
105.
106.
107.
108.
109.
110.
111.
112.
113.
114.
115.
116.
117.
118.
Terry M. Norton
rations in a snapping turtle due to fishing gear
ingestion. J Zoo Wildl Med 28:109-113, 1997
Lawton MPC: Neurological disease, in Benyon PH
(ed): Manual of Reptiles. British Small Animal Veterinary Association. Ames, IA, Iowa State University
Press, 1992, pp 128-137
Redlow T, Foley A, Singel K: Sea turtle mortality
associated with red tide events in Florida, in Seminoff (compiler): 2002 Scientific Proceedings, 22nd
Annual Symposium on Sea Turtle Biology and Conservation, US Dept Commerce NOAA Tech Memo,
NMFS-SEFSC, Miami, FL 2002
Bennett RA: Neurology, in Mader DR (ed): Reptile
Medicine and Surgery. Philadelphia, PA, WB Saunders, 1996, pp 141-148
Norton TM, Jacobson ER, Caliguiri R, et al: Medical
management of a Galapagos tortoise (Geochelone elephantopus) with hypothyroidism. J Zool and Wildl
Med 20:212-216, 1989
Boyer TH: Hypovitaminosis A and hypervitaminosis
A, in Mader DR (ed): Reptile Medicine and Surgery. Philadelphia, PA, WB Saunders, 1996, pp
382-384
Boyer TH: Metabolic bone disease, in Mader DR
(ed): Reptile Medicine and Surgery. Philadelphia,
PA, WB Saunders, 1996, pp 385-391
Glazebrook JS, Campbell RSF: A survey of the diseases of marine turtles in northern Australia. II.
Oceanarium-reared and wild turtles Dis Aquat Org
9:97-104, 1990
Norton TM, Keller JM, Peden-Adams M, et al: Debilitated loggerhead turtle (Caretta caretta) syndrome along the southeastern US coast: Incidence,
pathogenesis, and monitoring, in: 2005 Scientific
Proceedings, 25th Annual Symposium on Sea Turtle
Biology and Conservation, Savannah, GA, 2005
DeNardo D, Barten SL, Rosenthal KL, et al: Dystocia Roundtable. J Herp Med and Surg, 10:8-17, 2003
Thomas HL, Willer CJ, Wasar MA, et al: Egg-retention in the urinary bladder of a Florida cooter turtle, Pseudemys floridana floridana. J Herpetol Med
Surg 12:4-6, 2002
Nutter FB, Lee DD, Stamper MA, et al: Hemiovariosalpingectomy in a loggerhead sea turtle (Caretta
caretta). Vet Record 146:78-80, 2000
McKown RD: A cystic calculus from a wild western
spiny soft-shell turtle Apalone (Trionyx) spiniferus hartwegi. J Zoo Wildl Med 29:347, 1998
Bennett RA, Mader, DR: Soft tissue surgery, in
Mader DR (ed): Reptile Medicine and Surgery.
Philadelphia, PA, WB Saunders, 1996, pp 295-296
McArthur S: Problem-solving approach to common
diseases of terrestrial and semi-aquatic chelonians,
in McArthur S, Wilkinson R, Meyer J (eds): Medicine and Surgery of Tortoises and Turtles. Ames,
IA, Blackwell Publishing, 2004, p 315
Bennett RA: Cloacal prolapse, in Mader DR (ed):
Reptile Medicine and Surgery, Philadelphia, PA,
WB Sauders, 1996, pp 355-359
McArthur S: Problem-solving approach to common
diseases of terrestrial and semi-aquatic chelonians,
in McArthur S, Wilkinson R, Meyer J (eds): Medicine and Surgery of Tortoises and Turtles. Ames,
IA, Blackwell Publishing, 2004, p 323
Stover J, Norton T, Jacobson E, et al: Cistudinomyia
119.
120.
121.
122.
123.
124.
125.
126.
127.
128.
129.
130.
131.
132.
133.
134.
cistudinis infestation in Aldabra tortoises. Int Colloq
Pathol Reptiles Amphib 3:109-110, 1989
Sales MJ, Ferrer D, Castella J, et al: Myiasis in two
Hermann’s tortoises (Testudo hermanni). Vet Rec
153:600-601, 2003
George RH: Health problems and diseases of sea
turtles, in Lutz PL, Musick JA (eds), The Biology of
Sea Turtles, Boca Raton, FL, CRC Press 1997, pp.
363-386
Jacobson ER, Clubb S, Gaskin JM, et al: Amoebiasis
in red-footed tortoises. J Amer Vet Med Assoc 183:
1192-1194, 1983
Bonner B, Denver M, Garner M, et al: Roundtable:
Entamoeba invadens. J Herpetol Med Surg 11:17-22,
2001
Jacobson ER, Schumacher J, Telford SR, et al: Intranuclear coccidiosis in radiated tortoises (Geochelone radiata) J Zoo Wildl Med 25:95-122, 1994
Garner MM, Gardiner C, Linn M, et al: Seven new
cases of intranuclear coccidiosis in tortoises, an
emerging disease? in 1998 Scientific Proceedings,
Annual Conference of the American Association of
Zoo Veterinarians. Omaha, NE, American Association of Wildlife Veterinarians, 1998, pp 71-73
Gordon AN, Kelly WR, Lester JG: Epizootic mortality of free-living green turtles (Chelonia mydas), due
to coccidiosis. J Wildl Dis 29:490-494, 1993
Rideout BA, Montali RJ, Phillips LJ, et al: Mortality
of captive tortoises due to viviparous nematodes of
the genus Proatractis (family Atractidae). J Wildl Dis
23:103-108, 1987
Glazebrook JS, Campbell RSF, Blair D: Studies on
cardiovascular fluke (Digenea: Spirorchiidae) infections in sea turtles from the Great Barrier Reef,
Queensland, Australia. J Comp Path 101:231, 1989
Reavill DR, Schmidt RE, Stevenson R: Review of
spirorchid flukes (Digenea: Spirorchidae) and 3
cases in freshwater turtles, in 2004 Scientific Proceedings, Annual Conference of the Association of
Reptilian and Amphibian Veterinarians. Naples, FL,
Association of reptile and Amphibian Veterinarians, 2004, pp 139-142
Zwart P, Truyens HA: Hexamitiasis in tortoises. Vet.
Parasitol 1:175-183, 1975
Jacobson E, Chrisman C, Homer B, et al: Pathologic
findings in loggerhead, Caretta caretta, with polyneuropathy in coastal waters off south Florida, in 2001
Scientific Proceedings, Annual Conference of the
Association of Reptilian and Amphibian Veterinarians. Orlando, FL, Association of Reptile and Amphibian Veterinarians, 2001, pp 57-58
Kolmstetter CM, Frazier D, Cox S, et al: Pharmacokinetics of metronidazole in the green iguana,
Iguana iguana. Bull Assoc Reptile and Amphibian
Vet, 8:4-7, 1998
Adnyana W, Ladds PW, Blair D: Efficacy of praziquantel in the treatment of green sea turtles with
spontaneous infection of cardiovascular flukes. Aust
Vet J 75:405-407, 1997
Jacobson ER: Reptilian virus diagnosis, in Fudge
(ed) Laboratory Medicine-Avian and Exotic Pets,
WB Saunders, Philadelphia, PA, pp 229-235, 1999
McArthur S, Blahak S, Koelle P, et al: Roundtable:
Chelonian herpesvirus. J Herpetol Med Surg 12:1431, 2002
129
Chelonian Emergency and Critical Care
135.
136.
137.
138.
139.
140.
141.
142.
143.
144.
145.
146.
147.
148.
149.
Petttan-Brewer KCB, Drew ML, Ramsay E, et al:
Herpesvirus particles associated with oral and respiratory lesions in a California desert tortoise (Gopherus agassizii), J Wildl Dis, 32:521-526, 1996
Westhouse RA, Jacobson ER, Harris RK, et al: Respiratory and pharyngo-esophogeal iridovirus infection in a gopher tortoise (Gopherus polyphemus). J
Wildl Dis 32:682-686, 1996
Johnson AJ, Norton TM, Wellehan JFX, et al: Irirodvirus outbreak in captive Burmese star tortoises
(Geochelone platynota). 2004 Scientific Proceedings,
Annual Conference of the Association of Reptilian
and Amphibian Veterinarians. Naples, FL, Association of Reptilian and Amphibian Veterinarians,
2004, pp 143-144
Schumacher IM, Bradford-Haddenbrook D, Brown
MB, et al: Relationship between clinical signs of
URTD and antibodies to Mycoplasma agassizii in
Desert torts from Nevada. J Wildl Dis 33:261-266,
1997
Jacobson ER, Maclaughlin GS: Chelonian mycoplasmosis. 1997 Scientific Proceedings, Annual Conference of the Association of Reptilian and Amphibian
Veterinarians. Houston, TX, Association of Reptilian and Amphibian Veterinarians, 1997, pp 99-103
McLaughlin GS, Jacobson ER, Brown DR, et al:
Upper respiratory disease in gopher tortoises:
pathologic investigation of naturally occurring disease in Florida J Wildl Dis 36:272-283, 2000
Jacobson ER, Gaskin JM, Brown MB, et al: Chronic
upper respiratory disease of free-ranging desert tortoises (Xerobates agassizii). J Wildl Dis 27:296-316,
1991
Muro J, Ramis A, Pastor J, et al: Chronic rhinitis
associated with herpesviral infection in captive spurthighed tortoises from Spain. J Wildl Dis 34:487495, 1998
Une Y, Uemura K, Kamile J, et al: Herpesvirus infection in tortoises (Malacochersus tornieri and
Testudo horsfieldi). Vet Pathol 36:624-627, 1999
Soares JF, Chalker VJ, Erles K, et al: Prevalence of
Mycoplasma agassizi and chelonian herpesvirus in
captive tortoises (Testudo spp) in the United Kingdom. 2003 Scientific Proceedings, Annual Conference of the Association of Reptilian and Amphibian
Veterinarians. Minneapolis, MN, Association of
Reptilian and Amphibian Veterinarians, 2003, p 91
Jacobson ER, Gaskin JM, Roelke, et al: Conjunctivitis, tracheitis and pneumonia associated with herpesvirus infection in green sea turtles. J Amer Vet
Med Assoc 189:1220-1223, 1986
Jacobson ER, Gaskin JM, Walkquist H: Herpesviruslike infection in map turtles. J Amer Vet Med Assoc
181:1322-1324
Jacobson ER, Burgelt C, Williams B, et al: Herpesvirus in cutaneous fibropapillomatosis of the green
sea turtle. Dis Aquatic Org 12:1, 1991
Herbst LH, Greiner EC, Ehrhart LM, et al: Serological association between spirorchidiasis, herpesvirus
infections, and fibropapillomatosis in Green turtles
from Florida. J Wildl Dis 34:497-507, 1998
Curry SS, Brown DR, Gaskin JM, et al: Persistent
infectivity of a disease associated herpesvirus in
green turtles after exposure to seawater. J Wildl Dis
36:792-797, 2000
150.
151.
152.
153.
154.
155.
156.
157.
158.
159.
160.
161.
162.
163.
164.
165.
166.
167.
Jacobson ER, Mansell, Sundberg JP et al: Cutaneous
fibropapillomas in green turtles (Chelonia mydas).
J Comp Path 101:3952, 1989
Herbst LH, Jacobson ER, Klein PA: Green turtle
fibropapillomatosis. Evidence for a viral etiology.
1995 Scientific Proceedings, Annual Conference of
the American Association of Zoo Veterinarians. East
Lansing, MI, American Association of Zoo Veterinarians, 1995, p 224
Aguirre AA, Spraker TR, Balazs GH, et al: Spirorchidiasis and fibropapillomas in green turtles
from the Hawaiian Islands. J Wildl Dis 34:91-98,
1998
Norton TM, Jacobson ER, Sunburg J: Cutaneous
and renal fibropapilloma in a green turtle, Chelonia
mydas. J Wildl Dis 26:212-216, 1990
De Voe R, Geissler K, Elmore S, et al: Ranavirusassociated morbidity and mortality in a group of
captive eastern box turtles (Terrapene carolina carolina). J Zoo Wildl Med 35:534-543, 2004
Chen ZX, Zheng JC, Jiang YL: A new iridovirus
isolated from soft-shelled turtles. Virus Res 63:147151, 1999
Origgi FC, Klein PA, Mathes K, et al: Enzyme-linked
immunosorbent assay for detecting herpesvirus exposure in Mediterranean tortoises. J Clin Microbiol
39:3156-3163, 2001
McArthur S: Problem-solving approach to common
diseases of terrestrial and semi-aquatic chelonians,
in McArthur S, Wilkinson R, Meyer J (eds): Medicine and Surgery of Tortoises and Turtles. Ames,
IA, Blackwell Publishing, 2004, p 374
Stewart JS: Anaerobic bacterial infections in reptiles. J Zoo Wildl Med 21:180, 1990
McArthur S: Infectious agents, in McArthur S,
Wilkinson R, & Meyer J (eds): Medicine and
Surgery of Tortoises and Turtles. Ames, IA, Blackwell Publishing, 2004, pp 31-34
Greer LL, Strandberg JD, Whitaker BR: Mycobacterium chelonae osteoarthritis in a Kemp’s Ridley sea
turtle (Lepidochelys kempii). J Wild Dis 39:736-41,
2003
Bemis DA, Patton CS, Ramsey EC: Dermatophilosis
in captive tortoises. J Vet Diagn Invest 11:553-557,
1999
Masters AM, Ellis TM, Carson JM, et al: Dermatophilus chelonae sp. nov. isolated from chelonids in
Australia. Int J Syst Bact, 45:50-56, 1995
Brown JD, Sleeman JM, Elvinger F: Epidemiological
determinants of aural abscessation in free-living
Eastern box turtles (Terrapene carolina) in Virginia. J
Wild Dis 39:918-921, 2003
Willer CJ, Lewbart GA, Lemons C: Aural abscesses
in wild Eastern box turtles, Terrapene carolina
carolina, from North Carolina: aerobic bacterial
isolates and distribution of lesions J Herpetol Med
Surg 13(2):4-9, 2003
Cutler SL: Nematode-associated aural abscess in a
Mediterranean tortoise, Testudo graeca. J Herpetol
Med Surg 14:4-5, 2004
Jacobson ER, Calderwood MB, Clubb SL: Mucormycosis in hatchling Florida soft-shelled turtles. J Amer
Vet Assoc 177:835-837, 1980
Divers SJ, Lawton MPC: Antibiotic-impregnated
polymethylmethacrylate beads as a treatment for
130
168.
169.
170.
171.
172.
Terry M. Norton
osteomyelitis in reptiles, in 1999 Scientific
Proceedings, Annual Conference of the Association
of Reptilian and Amphibian Veterinarians.
Columbus, Ohio, Association of Reptile and
Amphibian Veterinarians, pp 145-147
Murray MJ. Pneumonia and normal respiratory
function, in Mader DR (ed): Reptile Medicine and
Surgery. WB Saunders Co, Philadelphia, 1996, pp
396-405
Vanrompay D, De Meurichy W, Ducatelle R, et al:
Pneumonia in Moorish tortoises (Testudo graeca)
associated with avian serovar A Chlamydia psittaci.
Vet Rec 17:284-285, 1994
Jacobson ER, Gaskin JM, Shields RP: Mycotic pneumonia in mariculture reared green turtles. J Amer
Vet Med Assoc 175:929-933, 1979
Hernandez-Divers SJ: Pulmonary candidiasis caused
by Candida albicans in a Greek tortoise (Testudo
graeca) and treatment with intrapulmonary amphotericin B. J Zoo Wild Med 32:352-359, 2001
Hernandez-Divers SJ, Norton T, Hernandez-Divers
S: Endoscopic diagnosis of pulmonary granulomas
due to Paecilomyces in a juvenile loggerhead sea
turtle, Caretta caretta, in 2002 Scientific Proceedings,
Annual Conference of the Association of Reptilian
and Amphibian Veterinarians. Reno, Nevada, Asso-
173.
174.
175.
176.
177.
ciation of Reptilian and Amphibian Veterinarians,
2002, pp 3-4
Divers SJ: Two techniques for endoscopic evaluation of the chelonian lung, in 2002 Scientific
Proceedings, Annual Conference of the Proceedings Association of Reptilian and Amphibian Veterinarians. Reno, Nevada, Association of Reptilian and Amphibian Veterinarians, 2002, pp 123125
Divers SJ: The diagnosis and treatment of lower
respiratory tract disease in tortoises with particular
regard to intrapneumonic therapy, in 1998 Scientific Proceedings, Annual Conference of the Association of Reptilian and Amphibian Veterinarians.
Kansas City, MO, Association of Reptilian and Amphibian Veterinarians, 1998, pp 95-98
Garner MM, Herrington R, Howerth EW, et al:
Shell disease in river cooters (Pseudemys concinna)
and yellow-bellied turtles (Trachemys scripta) in a
Georgia lake. J Wild Dis 33:78-86, 1997
Carpenter JW, Mashima TY, Rupiper DJ: Exotic
Animal Formulary, Second Edition. Philadelphia,
PA, WB Saunders, 2001, pp 41-105
Costello MF: Principles of cardiopulmonary cerebral resuscitation in special species, in Fudge AM
(ed), Sem Avian Exotic Pet Med 13:132-141, 2004