Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
DOI 10.1186/s12887-017-0965-y
RESEARCH ARTICLE
Open Access
Full title: peripheral venous catheter
complications in children: predisposing
factors in a multicenter prospective cohort
study
Rim Ben Abdelaziz1,2,3,8* , Habiba Hafsi1, Hela Hajji1, Hela Boudabous1,2,3, Amel Ben Chehida1,2,3, Ali Mrabet2,4,
Khadija Boussetta2,5, Sihem Barsaoui2,6, Azza Sammoud2,7, Mourad Hamzaoui2,8, Hatem Azzouz1,2,3
and Néji Tebib1,2,3
Abstract
Background: Peripheral venous catheterization (PVC) is frequently used in children. This procedure is not free from
potential complications. Our purpose was to identify the types and incidences of PVC complications in children and
their predisposing factors in a developing country.
Methods: We conducted a prospective observational multicenter study in five pediatric and pediatric surgery
departments over a period of 2 months. Two hundred fifteen PVC procedures were conducted in 98 children. The
times of insertion and removal and the reasons for termination were noted, and the lifespan was calculated.
Descriptive data were expressed as percentages, means, standard deviations, medians and interquartile ranges. The
Chi2 test or the Fisher test, with hazard ratios and 95% confidence intervals (CI95%), as well as Student’s t test or the
Mann-Whitney U test were used to compare categorical and quantitative variables, respectively, in groups with and
without complications. The Spearman test was used to determine correlations between the lifespan and the
quantitative variables. The Kruskal Wallis test was used to test for differences in the median lifespan within 3 or
more subgroups of a variable. Linear regression and logistic binary regression were used for multivariate analysis. A
p-value <0.05 was considered significant.
Results: The mean lifespan was 68.82 ± 35.71 h. A local complication occurred in 111 PIVC (51.9%) cases. The risk
factors identified were a small catheter gauge (24-gauge) (p = 0.023), the use of a volume-controlled burette (p =
0.036), a longer duration of intravenous therapy (p < 0.001), a medical diagnosis of respiratory or infectious
disease (p = 0.047), the use of antibiotics (p = 0.005), including cefotaxime (p = 0.024) and vancomycin (p = 0.031),
and the use of proton pump inhibitors (p = 0.004).The lifespan of the catheters was reduced with the occurrence
of a complication (p < 0.001), including the use of 24-gauge catheters (p = 0.001), the use of an electronic pump
or syringe(p = 0.036) and a higher rank of the intravenous device in each patient (p = 0.010).
(Continued on next page)
* Correspondence: rimelair@gmail.com; rimbenabdelaziz@yahoo.fr
1
Department of Pediatrics, La Rabta Hospital, Tunis, Tunisia
2
Université Tunis El Manar, Faculté de Médecine de Tunis; LR12SPO2 les
maladies héréditaires du métabolisme investigation et prise en charge, Tunis,
Tunisia
Full list of author information is available at the end of the article
© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0
International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and
reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to
the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver
(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
Page 2 of 11
(Continued from previous page)
Conclusions: PVC complications were frequent in our pediatric departments and are often associated with
misuse of the device. These results could engender awareness among both doctors and nurses regarding the
need for rationalization of the use of PVC and better adherence to the recommendations for the use of each
drug and each administration method.
Keywords: Peripheral venous catheter, Children, Complication, Extravasation, Lifespan, Prevention
Background
Peripheral venous catheterization (PVC) is one of the
most frequently used procedures in hospitalized children. It is estimated that more than 80% of patients
undergo this procedure during hospitalization [1]. In
addition to the administration of intravenous fluids,
drugs, blood products and parenteral nutrition, peripheral venous catheters are also inserted prophylactically
before procedures and in unstable patients for emergency use [2].Despite its frequent use, intravenous
cannulation is not without risks. It is a leading source of
procedure-related pain in the hospital [3, 4].Complications such as clotting, occlusion, leakage, infiltration,
extravasation, phlebitis and infection can also occur [5].
In neonatal intensive care units, local complications
occur in up to 97%of PVCs [6–9], and the catheters have
a median lifespan of 23–40 h [6, 10]. Studies in pediatric
departments have reported a lower incidence of
complications in approximately a quarter of PVC cases
[11–13], with catheters having a median lifespan ranging
from 29 to 60 h [13–16].
Various risk factors of local PVC complications have been
identified in these studies, which may be related to patient
characteristics (a younger age [15, 16]), underlying
conditions such as diabetes or cancer [12], the nature of
drugs or fluids used (antibiotics, corticosteroids, hypertonic
solution, etc) [6, 17], the site of insertion (the antecubital
fossa [11, 18],wrist [15] and ankle [16]), the characteristics
of the catheter(a smaller gauge [15]), drug and medication
administration methods (infusion pumps [12]), and the
means of maintaining and securing the PVC (the use of
flushes and splints improves PVC patency [15, 19]).
In recent years, significant technological innovations
have been developed to promote the insertion use and
means of securing peripheral intravenous catheters
(PIVC). Cannula insertion can be facilitated with vein
visualization devices or ultrasound guidance [20–22].
Medical-grade tissue adhesives (cyanoacrylates) and
antimicrobial-impregnated dressings have shown promise
in reducing local and infectious complications associated
with intravenous therapy [23–25]. According to recent
data, clinical practice and international best practice recommendations for the use, care and maintenance of PVCs
have considerably changed [26].
In Tunisia, as in many other developing countries,
new technologies are not available because of their high
cost. Even basic products such as chlorhexidine or transparent film dressings are not routinely used in pediatric
units. Therefore, the available data on PVC complications in children, their risk factors and recommendations
for best practice are not systematically generalizable to
our circumstances.
Our study aimed to (i) provide data on the lifespan of
PIVC in children, (ii) describe the incidence and the
types of complications of PVC in Tunisian pediatric
departments, and (iii) identify any significant risk factors
for PVC failure.
Methods
Study design and settings
We conducted a prospective, multicenter study over a
period of 2 months, including April and May of
2015.Two university hospitals in Tunis participated: The
Children’s Hospital Béchir Hamza of Tunis (CHBH), the
pediatric Hospital in Tunisia, and La Rabta Hospital
(LRH),a predominantly adult hospital hosting a pediatric
department specialized in inherited metabolic diseases.
In total, four pediatric departments and one pediatric
surgery department participated in the study. The overall
hospitalization capacity of these departments is 260
beds. Only the pediatric department of LRH is a
mother-child ward. In the other wards, children are hospitalized by themselves and mothers are allowed to visit
for a few hours during the day.
Sample and recruitment
All patients admitted to the hospital and requiring at
least one PIVC were included. Children referred from
another department with a pre-existing PIVC were
excluded. Any children who underwent PIVC placement
later during hospitalization were included. Children
transferred out with a PIVC in place were also noted,
but they were not followed up in the wards. These PVCs
were labeled as non-complication cases.
We calculated that a sample of at least 200 PVCs was
clinically practical and sufficient to provide a
heterogenous sample containing all important factors
that contribute to complications and would be large
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
enough to overcome potential biases [27].Therefore, we
used a convenient study period of 2 months based on
feasibility and the number of patients treated in the
participating wards.
Study participation was initiated by a member of the
research team during routine morning visits who
collected baseline data and attached the data collection
form to the patient’s medical file.
Each patient was given a case number, and each catheter was numbered in the order of the time of insertion.
Outcome variables
The primary outcomes were (i) the lifespan of the PIVC
(calculated from the time of insertion to the time of
removal) and (ii) the occurrence of a complication
(occlusion, infiltration, phlebitis, necrosis, displacement
or infection). Both parameters were defined by clinicians
per their standard clinical judgment. No formal assessment tool was used. The secondary outcomes were variables with potential significant associations with PVC
complications, including patient characteristics (age,
gender, medical diagnosis), indication for PVC, PIVC
gauge, the site of insertion, medications and fluids, and
administration method. These specific variables were
chosen based on previous literature reporting risk
factors of PVC complications in children with consideration for the feasibility of their measurement given the
limited human resources dedicated to this study.
Data collection
Details related to the primary and secondary outcome
variables were collected on a paper form designed for
this study. Two research nurses dedicated to the study
completed the forms during business hours based on
information from monitoring sheets used in each ward.
Every day, each nurse went into one of the two hospitals
on an alternating basis to ensure a daily presence in the
study sites.
Catheter placement and monitoring
The participating hospitals do not have special intravenous insertion teams, so all PIVCs were inserted by
nurses who had completed PIVC insertion training.
Nurses were not aware of the study. Alcohol 70%was
used to decontaminate the skin and devices involved in
catheter manipulation. Both 24- and 22-gauge Teflon
cannulae were used (B-CAT I.V. cannula, BIÇAKCILAR®, Istanbul, Turkey and PRIMAFLON® I.V cannula,
Med Devices Lifesciences Ltd., London, UK).Ultrasound
and vein visualization devices were not available and
were not used for PIVC insertion during the study. Tape
dressings (Neoplast ® universal tape and universal tape
perforated with zinc oxide, Adhe-elss.a. Sousse Tunisia)
were used for the insertion site and the catheter hub.
Page 3 of 11
When necessary, additional nonsterile tape, bandages
and splints were used. No extension set was used
between the PIVC and devices used for infusions or
syringes for the administration of boluses. The infusions
and medications were given by either the gravitational
method (with or without a volume-controlled burette
(VCB)) (Alaris® GW volumetric pump, CareFusion,
Hampshire, UK and Romsons ® vented infusion set,
Romsons Junior, Agra India and Infusion burette
SO.F.A.P TN, Tunis, Tunisia), infusion pumps or
electronic syringes (depending on their availability) (Lifepum ® Syringe pump, Well Kang Ltd., Dublin, Ireland,
Perfusor ® compact, Braun and Phoenix® syringe pump,
Foures, GRADIGNAN - France), or bolus injection.
PIVCs were flushed with normal saline solution before
use. The insertion site was assessed during nursing
rounds or if a sign (from the patient himself or his
mother, the medical staff or the infusion device) of
potential dysfunction emerged. Dressings were replaced
if they were loose or if visible ooze was noticed. In all
cases, the catheters were discontinued or replaced based
on clinical indications (no routine changes to the
catheters).
Ethical considerations
The study was approved by local Clinical Research
Ethics Committee. In our study there was no experimentation or intervention on patients. The manuscript did
not contain any recognizable patient data, so a written
informed consent was not required. Verbal parental permission was obtained and a subject’s consent was also
obtained when appropriate.
Statistical analysis
The data were processed using SPSS Version 21 software. For categorical variables, we calculated percentages. For quantitative variables, we calculated the means,
standard deviations, medians and interquartile ranges
(IQRs). For intergroup comparisons, we used the Chi2
test or the Fisher exact test for categorical variables.
Hazard ratios (HR) were analyzed with 95% confidence
intervals (CI95%). For quantitative variables, we used
Student’s t-test or the non-parametric Mann-Whitney
Utest as indicated. The Spearman test was used to determine correlations between two quantitative variables
(such as the lifespan of a PIVC and the age of a patient
or the total duration of intravenous (IV) therapy). The
Kruskal Wallis test was used to test for differences in
the median lifespan within 3 or more subgroups of a
variable (such as administration method and study site).
For the multivariate analysis, we included variables with
a p-value < 0.2 in the univariate analysis and any other
variable predicted to be a potential risk factor for the
outcome variables (the occurrence of complications and
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
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PIVC lifespan) based on previous literature. The forced
entry method was used to introduce all predictor
variables in one block. For the variable occurrence of a
complication, we used logistic binary regression and for
the variable PIVC lifespan, we used linear regression. A
p-value <0.05 was considered significant.
details of the device characteristics are given in Table 2.
The gravitational method (with or without VCB) was
predominantly used, accounting for 77.7% of the cases.
The total duration of IV therapy was significantly longer
when a VCB was used (14.91 ± 4.01 days) compared to
the gravitational method (7.62 ± 4.01 days) or an infusion
pump (6.23 ± 4.54 days) (p < 0.001).
Results
Participant characteristics
PVC complications
In this study, 98 children were included. The mean age
was 5.2 ± 4.7 years (range 0.1–18). The medical diagnoses groups were respiratory diseases (24.5%), infectious
diseases (15.3%), hematological diseases (18.3%), metabolic diseases (20.4%), dehydration (2%), surgery (6.1%),
neurological diseases (3.1%) and other diseases (11.2%).
The details of the participants’ characteristics are given
in Table 1.
Complications were observed in 111 PIVCs (51.9%)in 46
children (46%), including infiltration in 80 cases (37.2%),
accidental removal in 19 cases (8.8%), phlebitis in 11
cases (5.1%) and skin necrosis in one case. No local
infection or device-related bloodstream infections were
observed. Among the PIVCs with complications, 67
(60%) were replaced with a new device.
Factors associated with PVC complications
Catheter characteristics
Two hundred fifteen PIVCs were inserted with a mean
of 2.28 ± 1.69 PIVCs/patient (range 1–9). Twenty-twogauge catheters were used in 53.7% of the cases. The
insertion site was in the hand in 82.2% of the cases. The
main indications for PVCs were drug administration in
67.8% of the cases, infusion in 24.8% of the cases and
blood product transfusion in 7.5% of the cases. The
Table 1 Characteristics of participants (n = 98)
N (%)
Male gender
Median
(IQR)
49 (50)
Age (years)
4.5 (6.67)
Site of the study
Pediatric Department A of CHBH
31 (32)
Pediatric Department B of CHBH
8 (8)
Pediatric Department C of CHBH
22 (22)
Surgery Department A of CHBH
5 (5)
Pediatric Department of LRH
32 (33)
Diagnosis
Infection
15 (15.3)
Respiratory
24 (24.5)
Hematology
19 (18.3)
Metabolic
18 (20.4)
Dehydration
2 (2)
Neurologic
3 (3.1)
Surgery
6 (6.1)
Other
11 (11.2)
Duration of hospitalization in the study sites (days)
Total duration of intravenous therapy/patient (days)
CHBH Children’s Hospital Béchir Hamza, LRH La Rabta Hospital, IQR
Inter-quartile range
6 (7.25)
4.5 (4.75)
Among the patient- and device-related variables considered in the univariate analysis, the following variables
were significantly associated with the occurrence of local
complications: a small catheter gauge (24-gauge) (p =
0.023), the use of the gravitational method, especially
with a VCB (p = 0.036), a shorter indwelling time (p <
0.001), a longer duration of IV therapy (p < 0.001),medical diagnosis, especially respiratory and infectious diseases (p = 0.047), the type of IV drug used, especially
antibiotics (p = 0.031), including cefotaxime(p = 0.024)
and vancomycin (p = 0.031), and the use of proton pump
inhibitors (PPIs) (p = 0.004). All of these variables were
considered in the multivariate model and the use of PPIs
(p = 0.011), a longer duration of IV therapy (p < 0.001)
and a shorter indwelling time (p = 0.011) were found to
be statistically significant.
None of the other variables, such as the ward, a patient’s age and gender, insertion site (in the hand, foot or
head), the type of infusion, the administration of blood
products, or the method of drug administration, contributed to the occurrence of local PVC complications.
Table 3 shows the comparison of children and device
characteristics in the two groups with and without
complications.
When we considered each type of complication individually, some variables were associated with the occurrence of a specific type of complication in the
multivariate analysis. Infiltration (or extravasation) was
associated with a shorter indwelling time (p < 0.001), a
longer duration of IV therapy (p = 0.007), the use of antibiotics, including ceftriaxone (p = 0.035) and vancomycin (p = 0.032), and PPI use (p = 0.005). Phlebitis was
associated with PPI use (p = 0.031) and ceftriaxone (p =
0.017) and vancomycin (p = 0.011) use. Accidental PIVC
removal was associated with a shorter indwelling time
(p = 0.011).
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
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Table 2 Characteristics of devices (N = 215)
N (%)
Number of devices/patient
Median (IQR)
2 (2)
Indwelling time (hours)
72 (48)
Site of PVC insertion
Dorsum of the hand
170 (78.8)
Wrist
2 (1)
Antecubital fossa
3 (1.5)
Lower arm
2 (1)
Foot
37 (17.2)
Head
1 (0.5)
Cannula gauge
22G (blue)
115 (53.5)
24 G (yellow)
100 (46.5)
Reason for PVC insertion
Infusion
145 (67.4)
Medication
53 (24.7)
Blood product transfusion
17 (7.9)
Administration method
Gravitational
114 (53)
Volume-controlled burette
53 (24.7)
Infusion pump
48 (22.3)
Fluids
5% Dextrose
58 (27)
28 (13)
10% Dextrose
21 (9.8)
Normosaline solution
9 (4.2)
Drugs (one or more)/device
145 (67.4)
Number of drugs/device
Antibiotics (one or more)/device
114 (53)
Aciclovir
7 (3.3)
Paracetamol
31 (14.4)
Corticosteroids
16 (7.4)
Proton Pump Inhibitors
26 (12.1)
Pamidronate
7 (3.2)
Other
11 (5.1)
1 (1)
Rhythm of device use/day (N = 165)
≤3 times
92 (42.8)
> 3 times
123 (57.2)
IQR Inter-quartile range
PIVC lifespan and associated factors
The cumulative lifespan of a PIVC was up to 15,011 h.
The mean lifespan was 68.82 ± 35.71 h (range 1–168).
The factors associated with PIVC lifespan were catheter
gauge, the administration method, the rank of the IV
device in each patient, the nature of the infusion and the
study site. The mean lifespan was shorter for 24-gauge
catheters (61.32 ± 33.25 h) compared to 22-gauge
catheters (77.21 ± 36.26 h) (p < 0.001). When the gravitational method was used to administer infusions or drugs,
the lifespan of the PIVC was longer (72.56 ± 35.85 h)
when an electronic pump or syringe was used (60.03
± 33.88 h) (p < 0.001). The lifespan of a PIVC decreased
significantly with the rank of the device in the same
patient (Pearson coefficient = −0.216, p = 0.001). The
lifespan was shorter with the use of 10% dextrose (49.95
± 28.70 h) compared to 5% dextrose (74 ± 39.39 h) and
normal saline solutions (98.67 ± 47 h) (p = 0.005). Participants from the pediatric department of LRH had the
shortest PIVC lifespan (57.14 ± 33.34 h) compared to the
other departments (lifespan ranging from 65 ± 28.73 to
96 ± 33.94 h)(p = 0.005). When we considered the subgroup of PIVCs with complications, we found that the
difference in lifespan between the different study sites
was non-significant (p = 0.080). In the subgroup of
devices without complications, the lifespan was
significantly lower in the pediatric department of
LRH(64.7 ± 32.56 h) than in the other wards (lifespan
ranging from 86 ± 34 to 96 ± 33 h)(p = 0.001).
In the multivariate analysis, the use of 10% dextrose
was the only factor associated with a reduced PIVC lifespan (p = 0.003). Table 4 shows the details of the comparison of the means and standard deviations PIVC
lifespan between subgroups of patients and devices
characteristics.
Discussion
Local PVC complications were common in our pediatric
departments, which were observed in approximately half
of the devices and children. The complication rate was
higher than those from other studies on comparable
pediatric populations (not including neonatal and intensive care units) [11, 12]. These studies reported PVC
complications in approximately25% of devices. The most
frequent complications were infiltration and accidental
removal, affecting 37.2% and 17.1% of devices, respectively. These rates were higher than the results of Malyon
and al. who found rates of 14% and 5% for these complications [11] and de Lima Jacinto et al. who reported
infiltration in 16% of children [12].
We noted one case of skin necrosis, which was a result
of a late diagnosis of extravasation [28] partially due to a
lack of monitoring. In the wards where the study was
conducted, the nurse/patient ratio was variable, ranging
from 1:4 to 1:10 and even as low as 1:13 to 1:20 during
night shifts, affecting the quality of monitoring and
increasing the risk of delayed diagnosis of complications
and the occurrence of tissue damage [6].
The PIVC lifespan in our study was longer than that
found in the literature (68.82 ± 35.71 (range 1–168)).
Studies evaluating this variable in children are scarce.
The mean lifespan in these studies ranges from 29.53 to
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
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Table 3 Comparison of children and device characteristics in the two groups with and without complications
Characteristics
Complication (N = 109)
No Complication (N = 106)
Univariate analysis
Median ± IQR
N (%)
Median ± IQR
N (%)
p-value
Male gender
59 (54.1)
57 (53.8)
0.958
Age (years)
3 (5.7)
5 (6.7)
0.658
0.527
Duration of hospitalization (days)
13 (7)
8 (10)
0.093
0.383
HR [CI95%HR]
Multivariate Analysis
p-value
Total duration of IV therapy/patient (days)
11(10)
7 (8.75)
<0.001
0.011
Dwell time (hours)
48 (48)
72 (51.2)
<0.001
<0.001
Rank of the PVC/patient
2 (2)
1 (1)
0.352
Pediatric Department A of CHBH
30 (27.5)
33 (31.1)
0.764
Pediatric Department B of CHBH
14 (12.8)
10 (9.4)
Study site
Pediatric Department C of CHBH
34 (31.2)
29 (27.4)
Surgery Department A of CHBH
2 (1.8)
4 (3.8)
Pediatric Department of LRH
29 (26.6)
30 (28.3)
Infection
27 (24.8)
19 (17.9)
Respiratory
38 (34.9)
27 (25.5)
Hematology
14 (12.8)
21 (19.8)
Metabolic
9 (8.3)
21 (19.8)
Other
21 (19.3)
18 (17)
Hand
86 (78.9)
85 (80.2)
Foot
20 (18.3)
17 (16)
Other
3 (2.8)
4 (3.8)
22G (blue)
50 (45.9)
65 (61.3)
24 G (yellow)
59 (54.1)
41 (38.7)
76 (69.7)
69 (65.1)
Diagnosis
0.047
0.336
0.0547
0.714
Site of PVC insertion
Cannula gauge
0.023
1.87 [1.09–3.22]
0.164
Reason for PVC insertion
Medication
Infusion
26 (33.9)
27 (25.5)
Blood product transfusion
7 (6.4)
10 (9.4)
52 (47.7)
62 (58.5)
0.656
0.769
0.036
0.216
Drug/infusion administration method
Gravitational
Volume-controlled burette
35 (32.1)
18 (17)
Infusion pump
22 (20.2)
26 (24.5)
Administration rhythm ≥3 times/day
60 (55)
63 (59.4)
0.516
0.703
Number of medications/device
1 (1)
1 (1)
0.150
0.527
Antibiotics
68 (62.4)
46 (43.4)
0.005
Ampicillin
9 (8.3)
10 (9)
0.761
Amoxicillin clavulanate
9 (8.3)
9 (8.3)
0.951
Cefotaxim
29 (26.6)
15 (14.2)
0.024
Ceftriaxone
3 (2.8)
2 (1.9)
0.674
Ceftazidime
9 (8.3)
7 (6.6)
0.644
2.16 [1.25–3.73]
0.615
2.19 [1.1–4.39]
0.545
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
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Table 3 Comparison of children and device characteristics in the two groups with and without complications (Continued)
Characteristics
Fosfomycin
Complication (N = 109)
No Complication (N = 106)
Univariate analysis
Median ± IQR
N (%)
Median ± IQR
N (%)
p-value
1 (0.9)
3 (2.8)
0.365
Vancomycin
11 (10.1)
3 (2.8)
0.031
Amikacin
7 (6.4)
4 (3.8)
0.378
Paracetamol
11 (10.1)
20 (18.9)
0.067
Aciclovir
5 (4.8)
2 (1.9)
0.244
Proton Pump Inhibitors
20 (18.3)
6 (5.7)
0.004
Corticosteroids
10 (9.2)
6 (5.7)
0.326
Pamidronate
2 (1.8)
5 (4.7)
0.275
0.445
Multivariate Analysis
HR [CI95%HR]
p-value
3.86 [1.04–14.29]
0.104
0.572
3.74 [1.44–9.74]
0.011
Infusate
10% dextrose
10 (34.5)
11 (37.9)
5% dextrose
16 (55.2)
12 (41.4)
Normosaline
3 (10.3)
6 (20.7)
IQR Inter-quartile range, HR Hazard ratio, CI95%HR: Confidence interval to 95% of the hazard ratio
51 h, with significant variations (1 to 136 h) [6, 8, 17, 29,
30]. The PIVC lifespan was shorter with the use of 24gauge catheters compared to 22-gauge catheters and
electronic pumps or syringes compared to the gravitational method, a higher rank of the IV device in a patient, and the use of 10% dextrose solution compared to
5% dextrose and normal saline solutions. Only the use of
10% dextrose remained significant in the multivariate
analysis. Gupta et al. studied the lifespan of PIVCs in a
neonatal intensive care unit in India. He found no association between PIVC lifespan and the risk factors identified in our study. The use of cefotaxime was the only
factor that reduced the lifespan of PIVCs with complications in this study [6]. No other studies have reported
risk factors associated with a shorter PIVC lifespan, but
all factors identified in our study were associated with
PVC complications in the literature [12, 28].
Devices with complications had a shorter lifespan than
those without complications. The literature on this subject is conflicting. De Lima Jacinto reported that complications were associated with a shorter indwelling time
[12], while Malyon et al. found that indwelling time was
longer in PIVCs exhibiting complications and investigated reasonable expectations regarding PIVC indwelling
time in the acute pediatric population [11]. A recent review analyzed data from seven randomized controlled
trials that compared routine removal of peripheral IV
catheters with removal only when clinically indicated in
hospitalized or community patients receiving continuous
or intermittent infusions [31]. The authors found no evidence to support changing catheters every 72 to 96 h.
Consequently, they suggested that healthcare organizations consider a policy in which catheters are changed
only if clinically indicated.
We identified many risk factors associated with complications, but the ones that remained significant in the
multivariate analysis were a longer duration of IV therapy, and the use of PPIs, ceftriaxone and vancomycin.
Unlike other factors that have already been reported in
the literature [6, 8, 12, 30, 32, 33], the association between the use of PPIs and the occurrence of PVC complications is a novel finding.
We did not find any studies reporting on or attempting to explain this finding. Our investigations after the
study revealed that in four of the participating wards,
administration recommendations for PPIs and other
drugs were not respected. PPIs and corticosteroids were
administered via direct bolus injection rather than slow
infusion. Vancomycin was administered over 20–30 min,
which is less than the recommended time (≥1 h). These
practices were due to the lack of infusion pumps. The
nurses reduced administration time to enable the use of
the pumps in more patients. Therefore, one of the requirements to reduce complications in our pediatric departments is to have enough infusion pumps to
administer medications in accordance with the recommendations and ensure the safe use of these devices
[34].
The complication rate was significantly higher in the
VCB subgroup compared to the standard gravitational
drip and infusion pump subgroups. To our knowledge,
this result has not been reported previously. This finding
may be due to the lack of infusion pumps in our
pediatric departments (1 pump/10–20 patients in each
ward). Therefore, care providers tend to use VCBs rather
than pumps to administer medications and infusions, especially in neonates and young infants. This device is indicated for short infusions (<24 h) with a 21-gauge
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
Page 8 of 11
Table 4 comparison of PVC lifespan means and standard deviations between subgroups of patients and devices characteristics
Male gender
yes
no
mean ± SD
mean ± SD
73.26 ± 36.88
65.84 ± 34.04
p-value univariate
Spearman coefficient
p-value multivariate
0.132
Age (years)
0.612
−0.035
Duration of hospitalization (days)
0.643
0.032
Total duration of IV therapy/patient (days)
0.551
0.041
Rank of the PVC/patient
0.001
−0.216
0.509
0.005
0.160
0.019
0.163
Study site
Pediatric Department A of CHBH
77.33 ± 35.66
Pediatric Department B of CHBH
65 ± 28.73
Pediatric Department C of CHBH
73.52 ± 37.3
Surgery Department A of CHBH
96 ± 33.94
Pediatric Department of LRH
57.14 ± 33.34
Diagnosis
Infection
68.76 ± 33.47
Respiratory
72.31 ± 37.18
Hematology
76.58 ± 34.27
Metabolic
75.2 ± 36.31
Other
56.71 ± 34.86
0.109
0.582
0.590
0.068
<0.001
0.610
0.690
0.979
0.009
0.233
Site of PVC insertion
Hand
70.41 ± 36.04
Foot
66.91 ± 34.91
Other
70.22 ± 35.54
Cannula gauge24 G (yellow)
61.33 ± 33.25
77.21 ± 36.26
Reason for PVC insertion
Medication
71.16 ± 35.21
Infusion
66.21 ± 38.83
Blood product transfusion
69.62 ± 30.62
Use of infusion pump
72.56 ± 35.85
60.30 ± 33.88
Number of medications/device
0.614
0.041
0.330
Administration rhythm ≥3 times/day
0.220
0.004
0.444
Antibiotics
71.06 ± 37.45
68.42 ± 33.77
0.590
67.89 ± 41.91
70.01 ± 35.17
0.806
Amoxicillin clavulanate
65.33 ± 34.74
70.23 ± 35.85
0.579
Cefotaxim
68.73 ± 33.38
70.1 ± 36.37
0.820
Ceftriaxone
86 ± 33.49
69.43 ± 35.75
0.306
Ceftazidime
79.25 ± 32.88
69.06 ± 35.89
0.273
Ampicillin
Fosfomycin
69.21 ± 35.43
102 ± 40.90
0.069
Vancomycin
66.86 ± 39.02
70.03 ± 35.56
0.749
Amikacin
0.812
0.418
82.72 ± 20.22
69.12 ± 36.26
0.069
0.440
Paracetamol
86.71 ± 32.6
66.97 ± 35.5
0.004
0.164
Aciclovir
61.71 ± 23.42
70.31 ± 36.07
0.533
Proton Pump Inhibitors
59.36 ± 34.29
71.26 ± 35.75
0.111
Corticosteroids
59.03 ± 28.06
70.69 ± 36.17
0.210
0.474
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
Page 9 of 11
Table 4 comparison of PVC lifespan means and standard deviations between subgroups of patients and devices characteristics
(Continued)
Pamidronate
yes
no
p-value univariate
mean ± SD
mean ± SD
49.71 ± 20.85
70.50 ± 35.94
Spearman coefficient
p-value multivariate
0.130
0.282
0.005
0.003
Infusate
10% dextrose
49.95 ± 28.70
5% dextrose
74 ± 39.39
Normal saline
98.67 ± 47
SD Standard deviation, IV Intravenous, PVC Peripheral venous cannula, CHBH Children’s Hospital Béchir Hamza, LRH La Rabta Hospital
cannula or larger. The main reported reason for complications related to this device is misuse [35]. In our study,
VCBs were used with small gauge catheters and the
mean duration of IV therapy with VCBs (14.91 ±
4.01 days) was longer than recommended and significantly longer compared with the gravitational method
(7.62 ± 4.01 days) or infusion pumps (6.23 ± 4.54 days)
(p < 0.001). In addition, the height of the infusion bag in
relation to the patient must be 80 cm (Documentation
technique ASEPT INMED. Régulateur de debit DosiFlow®). We found that these requirements were ignored
among nurses in all wards that participated in our study.
Sixty percent of failed PIVCs were replaced, suggesting
that the other 40% were unnecessary and could have
been removed earlier. This result is consistent with the
data from Malyon et al. who reported that only the half
of failed PIVCs were replaced [11]. Limm et al. reported
that half of PIVCs inserted in the emergency department
was unused 72 h later [36].In the pediatric department
of LRH, the lifespans of all PIVCs and those without
complications were significantly shorter than those in
other departments in CHBH. This difference was not
observed in the devices exhibiting complications. Since
routine PIVC replacement was not implemented in the
participating wards, this result suggests that in the
pediatric department of LRH, nurses tend to remove unused PIVCs earlier than in other wards. Therefore, the
staff in these other wards needs to be educated regarding
the removal of useless PIVCs to reduce the risk of PVC
complications [11].
We also found that PVC complications were
associated with a longer total duration of IV therapy.
This is consistent with the data in the literature
[12]. Rationalizing the use of IV therapy may
contribute to reducing the PVC complication rate in
our hospitals.
In our study, practices for PIVC insertion, dressing,
safeguarding and maintenance were different from international standards [26]. Therefore, we considered that
these practices, in addition to the other factors identified
in our study, may have contributed to the higher rate of
complications compared to the literature. In fact, it is
known that PIVC dressings play a vital role in preventing catheter complications [37].
In our study, nurses used tape for PIVC dressings
while Malyon et al. used bordered polyurethane dressings (BPU) [11]. Livesley and Richardson compared
these two methods and found that peripheral venous
catheter failure occurred less frequently in the tape
group than in the bordered transparent dressing group
[38]. However, replacing tape dressings with polyurethane dressings is not a priority for us in reducing the rate
of PVC complications since polyurethane dressings are
costly and unavailable in our hospitals.
Splinting was not routinely performed in our study.
Laudenbach et al... found no differences in complication
rates or types between two groups of children with and
without splinting [39], while Tripathi et al. found that
splints significantly prolonged PIVC survival, especially
in younger patients [15]. Hugill et al. recommend the
use of splints to reduce catheter movement, especially
when a catheter is inserted in an area with high flexion
and in neonates [25].We must consider the application
of these recommendations to reduce the high rate of
complications in our hospitals.
For skin preparation, alcohol 70% was used in our
study, but chlorhexidine 2% in combination with alcohol 70% is recommended in international guidelines
[34] and was used in Malyon et al’s study [11]. Studies comparing these two methods confirmed the
superiority of chlorhexidine solution in reducing bacterial contamination or colonization on a device. No
significant differences were noted in terms of displacement or infiltration between the two methods
[40, 41]. The available data are not sufficient to determine whether the skin preparation procedure contributed to the relatively high rate of PVC failure in our
study. Further investigations are required to determine whether to use chlorhexidine 2% in combination
with alcohol 70% routinely, especially because this
product is not available in all of our public hospitals.
Recently, the use of chlorhexidine 2% in combination
with alcohol 70% was introduced in CHBH. Therefore, a study should be conducted to evaluate the
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
effect of this change in practice on the PVC-related
complication rate in this hospital.
Strengths and limitations
Our study is the first multicenter cohort study on PVC
complications in a tertiary pediatric population in a
developing country. Our results could be regarded as
preliminary data for the implementation of practices to
reduce the incidence of PVC complications in children
in Tunisia and in other developing countries.
However, a few limitations exist in this study. The lack
of funding limited the number of people dedicated to
data collection. The two nurses who collected the data
were volunteers, as this study was part of their end-ofstudy project, and they could only be present during
business hours. This could be a source of bias as some
patients, especially those who were admitted and
released or transferred during night shifts, and rapidly
removed devices could have been missed. To some
extent, this could explain the longer mean lifespan of
PIVCs in our study compared to other studies in
children.
The variables studied were numerous, but because of
limited feasibility due to limited resources for our study,
we could not integrate all potential factors that could
affect the occurrence of PVC complications, including
details related to PIVC fixation and dressing, maintenance practices, and details regarding PIVC use (the sizes
of the syringes used to administer each medication, the
type of pump used, the infusion rate, and adherence to
recommendations for each medication or device used)
[15, 25, 39, 42–44]. These variables should be considered
in future studies to evaluate actions that can be taken in
our hospitals to reduce PVC-related complications.
Page 10 of 11
Abbreviations
CHBH: CHILDREN’S Hospital Béchir Hamza; CI95%: 95% confidence interval;
HR: Hazard ratio; IQR: Interquartile range; IV: Intravenous; LRH: La Rabta Hospital;
PIVC: Peripheral intravenous venous catheter; PPI: Proton pump inhibitors;
PVC: Peripheral venous catheterization; VCB: Volume-controlled burette
Acknowledgements
The authors would like to acknowledge their collaboration with all medical
and nursing staff of the Pediatric and Pediatric Surgery departments of La
Rabta University Hospital and Hôpital d’enfants Béchir Hamza de Tunis who
participated in the study.
Funding
All the authors declare there is no source of funding for this study.
Availability of data and materials
The datasets used and/or analyzed during the current study are available
from the corresponding author upon reasonable request.
Authors’ contributions
RBA participated in the study design, statistical analysis of the data and
manuscript drafting. HH participated in data collection, statistical analysis of
the data and manuscript drafting. AM participated in the statistical analysis
and manuscript drafting. HH, HBD, ABC, KB, SB,AS,MH,HA, and NT
participated in data collection. The final manuscript version has been
reviewed and approved by all authors.
Ethics approval and consent to participate
The La Rabta University Hospital Local Clinical Research Ethics Committee
evaluated and approved the study protocol. All patients and their parents or
legal representatives provided informed consent to participate in the study.
Consent for publication
Not applicable.
Competing interests
All authors declare that they have no competing interests.
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in
published maps and institutional affiliations.
Author details
Department of Pediatrics, La Rabta Hospital, Tunis, Tunisia. 2Université Tunis
El Manar, Faculté de Médecine de Tunis; LR12SPO2 les maladies héréditaires
du métabolisme investigation et prise en charge, Tunis, Tunisia. 3Université
Tunis El Manar, Faculté de Médecine de Tunis; Military General Directorate of
Health, department of Epidemiology and Public Health, Tunis, Tunisia.
4
Université Tunis El Manar, Faculté de Médecine de Tunis; Department of
Pediatrics B, Hôpital d’enfants Béchir Hamza de Tunis, Tunis, Tunisia.
5
Université Tunis El Manar, Faculté de Médecine de Tunis; Department of
Pediatrics A, Hôpital d’enfants Béchir Hamza de Tunis, Tunis, Tunisia.
6
Université Tunis El Manar, Faculté de Médecine de Tunis; Department of
Pediatrics C, Hôpital d’enfants Béchir Hamza de Tunis, Tunis, Tunisia.
7
Université Tunis El Manar, Faculté de Médecine de Tunis; Department of
Pediatric Surgery A, Hôpital d’enfants Béchir Hamza de Tunis, Tunis, Tunisia.
8
Department of Pediatrics, La Rabta Hospital Jabbari, 1007 Tunis, Tunisia.
1
Conclusions
This study showed that the PVC-related complication
rate is high in our pediatric departments. Many of the
identified risk factors are preventable. Several practices
can be implemented in the immediate future without
additional cost, including rationalization of the use of
this device, reducing the duration of IV therapy,
removing unnecessary PIVCs, and better adherence to
the recommendations for the use of each drug and each
administration method. Improving PIVC protection
using splints in smaller children and when devices are
inserted in areas with high flexion should reduce
infiltration and removal rates. Other actions, such as
increasing the number of nurses per patient and supplying enough infusion pumps, require additional financial
investments and the involvement of health authorities in
our country. Further studies should be conducted to
evaluate the effects of these actions on PVC complication rates in our hospitals.
Received: 20 March 2017 Accepted: 8 December 2017
References
1. Waitt C, Waitt P, Pirmohamed M. Intravenous therapy. Postgrad Med J. 2004;
80(939):1–6.
2. Datta S, Hanning CD. How to insert a peripheral venous cannula. Br J Hosp
Med. 1990;43(1):67–9.
3. Zempsky WT. Optimizing the management of peripheral venous access
pain in children: evidence, impact, and implementation. Pediatrics. 2008;
122(Suppl 3):S121–4.
Ben Abdelaziz et al. BMC Pediatrics (2017) 17:208
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
Kennedy RM, Luhmann J, Zempsky WT. Clinical implications of unmanaged
needle-insertion pain and distress in children. Pediatrics. 2008;122(Suppl 3):
S130–3.
Pettit J. Assessment of infants with peripherally inserted central catheters:
part 2. Detecting less frequently occurring complications. Advances in
neonatal care : official journal of the National Association of Neonatal
Nurses. 2003;3(1):14–26.
Gupta P, Rai R, Basu S, Faridi MM. Lifespan of peripheral intravenous cannula
in a neonatal intensive care unit of a developing country. J Pediatr Nurs.
2003;18(4):287–92.
Legemaat M, Carr PJ, van Rens RM, van Dijk M, Poslawsky IE, van den
Hoogen A. Peripheral intravenous cannulation: complication rates in the
neonatal population: a multicenter observational study. The journal of
vascular access. 2016;17(4):360–5.
Franck LS, Hummel D, Connell K, Quinn D, Montgomery J. The safety and
efficacy of peripheral intravenous catheters in ill neonates. Neonatal
network : NN. 2001;20(5):33–8.
Danski MT, Mingorance P, Johann DA, Vayego SA, Lind J. Incidence of local
complications and risk factors associated with peripheral intravenous catheter
in neonates. Revista da Escola de Enfermagem da U S P. 2016;50(1):22–8.
Dalal SS, Chawla D, Singh J, Agarwal RK, Deorari AK, Paul VK. Limb splinting
for intravenous cannulae in neonates: a randomised controlled trial. Arch
Dis Child Fetal Neonatal Ed. 2009;94(6):F394–6.
Malyon L, Ullman AJ, Phillips N, Young J, Kleidon T, Murfield J, Rickard CM.
Peripheral intravenous catheter duration and failure in paediatric acute care:
a prospective cohort study. Emergency medicine Australasia : EMA. 2014;
26(6):602–8.
de Lima Jacinto AK, Avelar AF, Pedreira ML. Predisposing factors for
infiltration in children submitted to peripheral venous catheterization.
Journal of infusion nursing : the official publication of the Infusion Nurses
Society. 2011;34(6):391–8.
Hetzler R, Wilson M, Hill EK, Hollenback C. Securing pediatric peripheral i.V.
Catheters–application of an evidence-based practice model. J Pediatr Nurs.
2011;26(2):143–8.
Foster L, Wallis M, Paterson B, James H. A descriptive study of peripheral
intravenous catheters in patients admitted to a pediatric unit in one
Australian hospital. Journal of infusion nursing : the official publication of
the Infusion Nurses Society. 2002;25(3):159–67.
Tripathi S, Kaushik V, Singh V. Peripheral IVs: factors affecting complications
and patency–a randomized controlled trial. Journal of infusion nursing : the
official publication of the Infusion Nurses Society. 2008;31(3):182–8.
Unbeck M, Forberg U, Ygge BM, Ehrenberg A, Petzold M, Johansson E.
Peripheral venous catheter related complications are common among
paediatric and neonatal patients. Acta Paediatr. 2015;104(6):566–74.
Shenoy S, Karunakar BP. Factors influencing the peripheral venous catheter
survival in critically ill children in a pediatric intensive care unit. Indian J
Pediatr. 2014;81(12):1293–6.
Wallis MC, McGrail M, Webster J, Marsh N, Gowardman J, Playford EG,
Rickard CM. Risk factors for peripheral intravenous catheter failure: a
multivariate analysis of data from a randomized controlled trial. Infect
Control Hosp Epidemiol. 2014;35(1):63–8.
Pettit J. Assessment of infants with peripherally inserted central catheters:
part 1. Detecting the most frequently occurring complications. Advances in
neonatal care : official journal of the National Association of Neonatal
Nurses. 2002;2(6):304–15.
Tekindur S, Yetim M, Kilickaya O. Ultrasound-guided peripheral vein
cannulation. Am J Emerg Med. 2016;34(8):1675.
Kuo CC, Wu CY, Feng IJ, Lee WJ. Efficacy of ultrasound-guided peripheral
intravenous access: a systematic review and meta-analysis. Hu li za zhi The
journal of nursing. 2016;63(6):89–101.
Demir D, Inal S: Does the use of a vein visualization device for peripheral
venous catheter placement increase success rate in pediatric patients? Pediatr
Emerg Care; 2017. doi:10.1097/PEC.0000000000001007. [Epub ahead of print]
Rickard CM, Webster J, Wallis MC, Marsh N, McGrail MR, French V, Foster L,
Gallagher P, Gowardman JR, Zhang L, et al. Routine versus clinically
indicated replacement of peripheral intravenous catheters: a randomised
controlled equivalence trial. Lancet. 2012;380(9847):1066–74.
Silva M, Auguste AJ, Terzian ACB, Vedovello D, Riet-Correa F, Macario VMK,
Mourao MPG, Ullmann LS, Araujo JP Jr, Weaver SC, et al. Isolation and
characterization of Madariaga virus from a horse in Paraiba state. Brazil
Transbound Emerg Dis. 2017;64(3):990–3.
Page 11 of 11
25. Hugill K. Is there an optimal way of securing peripheral IV catheters in
children? British journal of nursing (Mark Allen Publishing). 2016;25(19):S20–1.
26. Gorski LA. The 2016 infusion therapy standards of practice. Home Healthc
Now. 2017;35(1):10–8.
27. Vittinghoff E, McCulloch CE. Relaxing the rule of ten events per variable in
logistic and Cox regression. Am J Epidemiol. 2007;165(6):710–8.
28. Thigpen JL. Peripheral intravenous extravasation: nursing procedure for
initial treatment. Neonatal network : NN. 2007;26(6):379–84.
29. Shimandle RB, Johnson D, Baker M, Stotland N, Karrison T, Arnow PM. Safety
of peripheral intravenous catheters in children. Infect Control Hosp
Epidemiol. 1999;20(11):736–40.
30. Machado AF, Pedreira ML, Chaud MN. Prospective, randomized and
controlled trial on the dwell time of peripheral intravenous catheters in
children, according to three dressing regimens. Revista latino-americana de
enfermagem. 2005;13(3):291–8.
31. Webster J, Osborne S, Rickard CM, New K. Clinically-indicated replacement
versus routine replacement of peripheral venous catheters. The Cochrane
database of systematic reviews. 2015;8:CD007798.
32. Phelps SJ, Helms RA. Risk factors affecting infiltration of peripheral venous
lines in infants. J Pediatr. 1987;111(3):384–9.
33. Forni C, Loro L, Tremosini M, Trofa C, D'Alessandro F, Sabbatini T, Kapron M,
Genco R, Schiavone M. Borri C et al: [cohort study of peripheral catheter related
complications and identification of predictive factors in a population of
orthopedic patients]. Assistenza infermieristica e ricerca : AIR. 2010;29(4):166–73.
34. Loveday HP, Wilson JA, Pratt RJ, Golsorkhi M, Tingle A, Bak A, Browne J,
Prieto J, Wilcox M. Health UKDo: epic3: national evidence-based guidelines
for preventing healthcare-associated infections in NHS hospitals in England.
The Journal of hospital infection. 2014;86(Suppl 1):S1–70.
35. Djian C, Nicolas C, Janoly-Dumenil A, MM P. Flow control regulator: misuse
and new guidelines. J Pharm Clin. 2008;27(2):65–72.
36. Limm EI, Fang X, Dendle C, Stuart RL, Egerton Warburton D. Half of all
peripheral intravenous lines in an Australian tertiary emergency department
are unused: pain with no gain? Ann Emerg Med. 2013;62(5):521–5.
37. Marsh N, Webster J, Mihala G, Rickard CM. Devices and dressings to secure
peripheral venous catheters: a Cochrane systematic review and metaanalysis. Int J Nurs Stud. 2016;67:12–9.
38. Livesley J, Richardson S. Securing methods for peripheral cannulae. Nurs
Stand. 1993;7(31):31–4.
39. Laudenbach N, Braun CA, Klaverkamp L, Hedman-Dennis S. Peripheral i.V.
Stabilization and the rate of complications in children: an exploratory study.
J Pediatr Nurs. 2014;29(4):348–53.
40. Small H, Adams D, Casey AL, Crosby CT, Lambert PA, Elliott T. Efficacy of
adding 2% (w/v) chlorhexidine gluconate to 70% (v/v) isopropyl alcohol for
skin disinfection prior to peripheral venous cannulation. Infect Control Hosp
Epidemiol. 2008;29(10):963–5.
41. Goudet V, Timsit JF, Lucet JC, Lepape A, Balayn D, Seguin S, Mimoz O.
Comparison of four skin preparation strategies to prevent catheter-related
infection in intensive care unit (CLEAN trial): a study protocol for a
randomized controlled trial. Trials. 2013;14:114.
42. Marsh N, Webster J, Mihala G, Rickard CM. Devices and dressings to secure
peripheral venous catheters: a Cochrane systematic review and metaanalysis. Int J Nurs Stud. 2017;67:12–9.
43. Ullman A, Marsh N, Rickard C. Securement for vascular access devices:
looking to the future. British journal of nursing (Mark Allen Publishing).
2017;26(8):S24–6.
44. Goossens GA. Flushing and locking of venous catheters: available evidence
and evidence deficit. Nursing research and practice. 2015;2015:985686.