Diseases that affect the neuromuscular junction (NMJ) interfere with normal nerve transmission an... more Diseases that affect the neuromuscular junction (NMJ) interfere with normal nerve transmission and cause weakness of voluntary muscles. The two most commonly encountered are acquired myasthenia gravis (MG) and the Lambert–Eaton myasthenic syndrome (LEMS). Acquired MG is an autoimmune disease in which antibodies are directed towards receptors at the NMJ. In 85% of patients, IgG antibodies against the postsynaptic acetylcholine receptor (AChR) are found (seropositive MG). The thymus gland appears to be involved in the production of these which cause an increase rate of degradation of AChR resulting in a decreased receptor density resulting in a reduced postsynaptic end-plate potential following motor nerve stimulation and leading to muscle weakness. Although all voluntary muscles can be affected, ocular, bulbar, respiratory, and proximal limb weakness predominates. In the majority of seronegative patients, an antibody directed towards a NMJ protein called muscle specific tyrosine kinase (MUSK) is found. Anti-MUSK MG is characterized by severe bulbar and respiratory muscle weakness. Diagnosis of MG requires a high degree of clinical suspicion coupled with pharmacological and electrophysiological testing, and detection of the various causative antibodies. Treatment of MG involves enhancing neuromuscular transmission with long-acting anticholinesterase agents and immunosuppression. Acute exacerbations are treated with either plasma exchange or intravenous immunoglobulin. Myasthenic crisis is associated with severe muscle weakness that necessitates tracheal intubation and mechanical ventilation. LEMS is an autoimmune disease in which IgG antibodies are directed towards the pre-synaptic voltage-gated calcium channels at the NMJ. It is often associated with malignant disease (usually small cell carcinoma of the lung). Autonomic dysfunction is prominent and patients show abnormal responses to neuromuscular blocking drugs.
Anaesthesia & Intensive Care Medicine, Dec 1, 2016
Abstract The brain uses large amounts of glucose for its basal energy requirements, and these are... more Abstract The brain uses large amounts of glucose for its basal energy requirements, and these are further increased during cerebral activation. In order that glucose can provide this energy, a plentiful and uninterrupted supply of oxygen is necessary. Cerebral blood flow is therefore critical for normal cerebral function. Its control is dictated by local intrinsic metabolic needs as well as extraneous factors such as arterial blood pressure, arterial carbon dioxide and oxygen tension, temperature and neural factors. This article reviews cerebral metabolism and cerebral blood flow and techniques by which both can be monitored.
Journal of Neurology, Neurosurgery & Psychiatry, 2019
ObjectivesThe placement of an external ventricular drain (EVD) is a common neurosurgical operatio... more ObjectivesThe placement of an external ventricular drain (EVD) is a common neurosurgical operation that carries great benefit in acute hydrocephalus but is not without risk. In our centre, bolt EVDs (B-EVD) are being placed in favour of tunnelled EVDs (T-EVD). The former has allowed for urgent CSF diversion in ITU. We compared EVD survival and complication rates between the two types of EVDs.DesignSingle centre prospective case-cohort.SubjectsTwenty-five patients with B-EVDs and thirty-four patients with T-EVDs.MethodsClinical notes and radiographic reports were collected before and after the placement of EVDs for patients in ITU between January 2017 and June 2018.ResultsFourteen of the 25 B-EVDs were placed on ITU, of which 2 were under stealth guidance. All 34 T-EVDs were placed in theatre. Mean time to CSF access after decision for diversion was 134 min in the B-EVD group and 227 min in the T-EVD group (p<0.05). Mean survival was 35 days for B-EVDs and 29 days for T-EVDs (p<...
Journal of Neurology, Neurosurgery & Psychiatry, 2019
ObjectivesAt this single centre, tri-modal monitoring of ICP, temperature and direct brain tissue... more ObjectivesAt this single centre, tri-modal monitoring of ICP, temperature and direct brain tissue oxygen tension (PbtO2) is used to guide management of delayed cerebral ischaemia (DCI). We describe our experience of PbtO2 monitoring and its relationship with symptoms of DCI, regional cerebral blood flow (rCBF, perfusion imaging), intra-arterial chemical angioplasty and CSF diversion.DesignProspective cohort.SubjectsPatients with aSAH who underwent over 24 hours of multi-modal PbtO2, temperature and intracranial pressure (ICP) monitoring via a Raumedic NEUROVENT-PTO probe.MethodsLongitudinal analysis of PbtO2 values, presented as mmHg (mean±SD).ResultsAnalysis of 1392 hours of tri-modal monitoring in 13 SAH patients. PbtO2 decreases >50% consistently reproduced focal neurological deficit. Symptomatic PbtO2 values ranged from 12–20 mmHg. Of the six patients who had reduced rCBF, all had a mean PbtO2 <15 mmHg. Five patients underwent intra-arterial chemical angioplasty (10 mg Ver...
This review considers important aspects in the provision of anesthesia for endovascular neurosurg... more This review considers important aspects in the provision of anesthesia for endovascular neurosurgery. Subject literature was reviewed to include important publications which have influenced neuro-interventional practice alongside recent meta-analyses to provide a contemporaneous evidence-based review. The scope of endovascular neurosurgery and interventional neuro-radiology continues to expand. The advancement of catheter and imaging technologies, alongside the development of novel techniques, has allowed a minimally invasive endovascular approach to be applied to pathologies previously only treatable by open surgery, and to patients previously considered unsuitable for invasive surgical approaches. This has led to increasing complexity in both the procedures performed and the patients encountered in the neuro-radiology suite. An understanding of the technical aspects, physiological requirements, and potential problems relating to each procedure is required to facilitate close cooperation between the anesthesiologist and neuro-interventional team, to provide safe and effective care.
This review considers important aspects in the provision of anesthesia for endovascular neurosurg... more This review considers important aspects in the provision of anesthesia for endovascular neurosurgery. Subject literature was reviewed to include important publications which have influenced neuro-interventional practice alongside recent meta-analyses to provide a contemporaneous evidence-based review. The scope of endovascular neurosurgery and interventional neuro-radiology continues to expand. The advancement of catheter and imaging technologies, alongside the development of novel techniques, has allowed a minimally invasive endovascular approach to be applied to pathologies previously only treatable by open surgery, and to patients previously considered unsuitable for invasive surgical approaches. This has led to increasing complexity in both the procedures performed and the patients encountered in the neuro-radiology suite. An understanding of the technical aspects, physiological requirements, and potential problems relating to each procedure is required to facilitate close coope...
BACKGROUND The coronavirus disease 2019 (COVID-19) pandemic has affected people of all ages, race... more BACKGROUND The coronavirus disease 2019 (COVID-19) pandemic has affected people of all ages, races, and socioeconomic groups, and placed extraordinary stress on health care workers (HCWs). We measured the prevalence of burnout and assessed wellbeing and quality of life (QoL) in HCWs at a single UK neuroscience center after the first pandemic surge. METHODS A 38-item electronic questionnaire was disseminated through local team email lists between May 22 and June 7, 2020, to HCWs in a university neurosciences center. Burnout was measured using the single-item Emotional Exhaustion and Depersonalization scales, and wellbeing and QoL assessed using the Linear Analogue Self-Assessment Scale and the EuroQol-5 Dimension instrument. RESULTS The response rate was 57.4% (n=234); 58.2% of respondents were nurses, 69.4% were women and 40.1% were aged 25 to 34 years. Overall, 21.4% of respondents reported burnout assessed by the Emotional Exhaustion scale; burnout was higher for nurses (23.5%) and allied health care professionals (22.5%) compared with doctors (16.4%). HCWs from ethnic minority groups reported a higher rate of burnout (24.5%) compared with white HCWs (15.0%). There were no differences in reported wellbeing or QoL between professional groups, or HCW age, sex, or race. Nurses (36.8%) and staff from ethnic minority groups (34.6%) were more fearful for their health than others. CONCLUSIONS Our findings highlight the prevalence of HCW burnout after the first surge of the pandemic, with an increased risk of burnout among nurses and staff from ethnic minority groups. Both nursing and staff from ethnic minority groups were also more fearful for their health. With ongoing pandemic surges, the impact on HCW wellbeing should be continuously assessed to ensure that local strategies to support staff wellbeing are diverse and inclusive.
Abstract Status epilepticus (SE) it is widely recognized as the second most common and life-threa... more Abstract Status epilepticus (SE) it is widely recognized as the second most common and life-threatening neurological emergency after stroke, which carries a high mortality and morbidity. The main goal of treatment is to emergently stop clinical and electrographic seizure activity. Most authorities agree on three-line treatment for SE with administration of benzodiazepines followed by longer-acting anti-epileptic agents and finally, if seizures persist, the administration of general anaesthetic agents.
The insertion of bolt external ventricular drains (EVD) on the intensive care unit (ICU) has enab... more The insertion of bolt external ventricular drains (EVD) on the intensive care unit (ICU) has enabled rapid cranial cerebrospinal fluid (CSF) diversion. However, bolt EVDs tend to be perceived as a more challenging technique, particularly when dealing with small ventricles or when there is midline shift distorting the ventricular morphology. Furthermore, if neuronavigation guidance is felt to be necessary, this usually assumes a transfer to an operating theatre. In this technical note, we describe the use of electromagnetic neuronavigation for bolt EVD insertion on the ICU and assess the protocol’s feasibility and accuracy. Case series of neuronavigation-assisted bolt EVD insertion in ICU setting, using Medtronic Flat Emitter for StealthStation EM. Neuronavigation-guided bolt EVDs were placed at the bedside in n = 5 patients on ICU. Their widest frontal ventricular horn diameter in the coronal plane ranged from 11 to 20 mm. No procedural complications were encountered. Post-procedural CT confirmed the optimal placement of the EVDs. Electromagnetic neuronavigation is feasible at the ICU bedside and can assist the insertion of bolt EVDs in this setting. The preference for a bolt EVD to be inserted in ICU—as is standard practice at this unit—should not prohibit patients from benefitting from image guidance if required.
Diseases that affect the neuromuscular junction (NMJ) interfere with normal nerve transmission an... more Diseases that affect the neuromuscular junction (NMJ) interfere with normal nerve transmission and cause weakness of voluntary muscles. The two most commonly encountered are acquired myasthenia gravis (MG) and the Lambert–Eaton myasthenic syndrome (LEMS). Acquired MG is an autoimmune disease in which antibodies are directed towards receptors at the NMJ. In 85% of patients, IgG antibodies against the postsynaptic acetylcholine receptor (AChR) are found (seropositive MG). The thymus gland appears to be involved in the production of these which cause an increase rate of degradation of AChR resulting in a decreased receptor density resulting in a reduced postsynaptic end-plate potential following motor nerve stimulation and leading to muscle weakness. Although all voluntary muscles can be affected, ocular, bulbar, respiratory, and proximal limb weakness predominates. In the majority of seronegative patients, an antibody directed towards a NMJ protein called muscle specific tyrosine kinase (MUSK) is found. Anti-MUSK MG is characterized by severe bulbar and respiratory muscle weakness. Diagnosis of MG requires a high degree of clinical suspicion coupled with pharmacological and electrophysiological testing, and detection of the various causative antibodies. Treatment of MG involves enhancing neuromuscular transmission with long-acting anticholinesterase agents and immunosuppression. Acute exacerbations are treated with either plasma exchange or intravenous immunoglobulin. Myasthenic crisis is associated with severe muscle weakness that necessitates tracheal intubation and mechanical ventilation. LEMS is an autoimmune disease in which IgG antibodies are directed towards the pre-synaptic voltage-gated calcium channels at the NMJ. It is often associated with malignant disease (usually small cell carcinoma of the lung). Autonomic dysfunction is prominent and patients show abnormal responses to neuromuscular blocking drugs.
Anaesthesia & Intensive Care Medicine, Dec 1, 2016
Abstract The brain uses large amounts of glucose for its basal energy requirements, and these are... more Abstract The brain uses large amounts of glucose for its basal energy requirements, and these are further increased during cerebral activation. In order that glucose can provide this energy, a plentiful and uninterrupted supply of oxygen is necessary. Cerebral blood flow is therefore critical for normal cerebral function. Its control is dictated by local intrinsic metabolic needs as well as extraneous factors such as arterial blood pressure, arterial carbon dioxide and oxygen tension, temperature and neural factors. This article reviews cerebral metabolism and cerebral blood flow and techniques by which both can be monitored.
Journal of Neurology, Neurosurgery & Psychiatry, 2019
ObjectivesThe placement of an external ventricular drain (EVD) is a common neurosurgical operatio... more ObjectivesThe placement of an external ventricular drain (EVD) is a common neurosurgical operation that carries great benefit in acute hydrocephalus but is not without risk. In our centre, bolt EVDs (B-EVD) are being placed in favour of tunnelled EVDs (T-EVD). The former has allowed for urgent CSF diversion in ITU. We compared EVD survival and complication rates between the two types of EVDs.DesignSingle centre prospective case-cohort.SubjectsTwenty-five patients with B-EVDs and thirty-four patients with T-EVDs.MethodsClinical notes and radiographic reports were collected before and after the placement of EVDs for patients in ITU between January 2017 and June 2018.ResultsFourteen of the 25 B-EVDs were placed on ITU, of which 2 were under stealth guidance. All 34 T-EVDs were placed in theatre. Mean time to CSF access after decision for diversion was 134 min in the B-EVD group and 227 min in the T-EVD group (p<0.05). Mean survival was 35 days for B-EVDs and 29 days for T-EVDs (p<...
Journal of Neurology, Neurosurgery & Psychiatry, 2019
ObjectivesAt this single centre, tri-modal monitoring of ICP, temperature and direct brain tissue... more ObjectivesAt this single centre, tri-modal monitoring of ICP, temperature and direct brain tissue oxygen tension (PbtO2) is used to guide management of delayed cerebral ischaemia (DCI). We describe our experience of PbtO2 monitoring and its relationship with symptoms of DCI, regional cerebral blood flow (rCBF, perfusion imaging), intra-arterial chemical angioplasty and CSF diversion.DesignProspective cohort.SubjectsPatients with aSAH who underwent over 24 hours of multi-modal PbtO2, temperature and intracranial pressure (ICP) monitoring via a Raumedic NEUROVENT-PTO probe.MethodsLongitudinal analysis of PbtO2 values, presented as mmHg (mean±SD).ResultsAnalysis of 1392 hours of tri-modal monitoring in 13 SAH patients. PbtO2 decreases >50% consistently reproduced focal neurological deficit. Symptomatic PbtO2 values ranged from 12–20 mmHg. Of the six patients who had reduced rCBF, all had a mean PbtO2 <15 mmHg. Five patients underwent intra-arterial chemical angioplasty (10 mg Ver...
This review considers important aspects in the provision of anesthesia for endovascular neurosurg... more This review considers important aspects in the provision of anesthesia for endovascular neurosurgery. Subject literature was reviewed to include important publications which have influenced neuro-interventional practice alongside recent meta-analyses to provide a contemporaneous evidence-based review. The scope of endovascular neurosurgery and interventional neuro-radiology continues to expand. The advancement of catheter and imaging technologies, alongside the development of novel techniques, has allowed a minimally invasive endovascular approach to be applied to pathologies previously only treatable by open surgery, and to patients previously considered unsuitable for invasive surgical approaches. This has led to increasing complexity in both the procedures performed and the patients encountered in the neuro-radiology suite. An understanding of the technical aspects, physiological requirements, and potential problems relating to each procedure is required to facilitate close cooperation between the anesthesiologist and neuro-interventional team, to provide safe and effective care.
This review considers important aspects in the provision of anesthesia for endovascular neurosurg... more This review considers important aspects in the provision of anesthesia for endovascular neurosurgery. Subject literature was reviewed to include important publications which have influenced neuro-interventional practice alongside recent meta-analyses to provide a contemporaneous evidence-based review. The scope of endovascular neurosurgery and interventional neuro-radiology continues to expand. The advancement of catheter and imaging technologies, alongside the development of novel techniques, has allowed a minimally invasive endovascular approach to be applied to pathologies previously only treatable by open surgery, and to patients previously considered unsuitable for invasive surgical approaches. This has led to increasing complexity in both the procedures performed and the patients encountered in the neuro-radiology suite. An understanding of the technical aspects, physiological requirements, and potential problems relating to each procedure is required to facilitate close coope...
BACKGROUND The coronavirus disease 2019 (COVID-19) pandemic has affected people of all ages, race... more BACKGROUND The coronavirus disease 2019 (COVID-19) pandemic has affected people of all ages, races, and socioeconomic groups, and placed extraordinary stress on health care workers (HCWs). We measured the prevalence of burnout and assessed wellbeing and quality of life (QoL) in HCWs at a single UK neuroscience center after the first pandemic surge. METHODS A 38-item electronic questionnaire was disseminated through local team email lists between May 22 and June 7, 2020, to HCWs in a university neurosciences center. Burnout was measured using the single-item Emotional Exhaustion and Depersonalization scales, and wellbeing and QoL assessed using the Linear Analogue Self-Assessment Scale and the EuroQol-5 Dimension instrument. RESULTS The response rate was 57.4% (n=234); 58.2% of respondents were nurses, 69.4% were women and 40.1% were aged 25 to 34 years. Overall, 21.4% of respondents reported burnout assessed by the Emotional Exhaustion scale; burnout was higher for nurses (23.5%) and allied health care professionals (22.5%) compared with doctors (16.4%). HCWs from ethnic minority groups reported a higher rate of burnout (24.5%) compared with white HCWs (15.0%). There were no differences in reported wellbeing or QoL between professional groups, or HCW age, sex, or race. Nurses (36.8%) and staff from ethnic minority groups (34.6%) were more fearful for their health than others. CONCLUSIONS Our findings highlight the prevalence of HCW burnout after the first surge of the pandemic, with an increased risk of burnout among nurses and staff from ethnic minority groups. Both nursing and staff from ethnic minority groups were also more fearful for their health. With ongoing pandemic surges, the impact on HCW wellbeing should be continuously assessed to ensure that local strategies to support staff wellbeing are diverse and inclusive.
Abstract Status epilepticus (SE) it is widely recognized as the second most common and life-threa... more Abstract Status epilepticus (SE) it is widely recognized as the second most common and life-threatening neurological emergency after stroke, which carries a high mortality and morbidity. The main goal of treatment is to emergently stop clinical and electrographic seizure activity. Most authorities agree on three-line treatment for SE with administration of benzodiazepines followed by longer-acting anti-epileptic agents and finally, if seizures persist, the administration of general anaesthetic agents.
The insertion of bolt external ventricular drains (EVD) on the intensive care unit (ICU) has enab... more The insertion of bolt external ventricular drains (EVD) on the intensive care unit (ICU) has enabled rapid cranial cerebrospinal fluid (CSF) diversion. However, bolt EVDs tend to be perceived as a more challenging technique, particularly when dealing with small ventricles or when there is midline shift distorting the ventricular morphology. Furthermore, if neuronavigation guidance is felt to be necessary, this usually assumes a transfer to an operating theatre. In this technical note, we describe the use of electromagnetic neuronavigation for bolt EVD insertion on the ICU and assess the protocol’s feasibility and accuracy. Case series of neuronavigation-assisted bolt EVD insertion in ICU setting, using Medtronic Flat Emitter for StealthStation EM. Neuronavigation-guided bolt EVDs were placed at the bedside in n = 5 patients on ICU. Their widest frontal ventricular horn diameter in the coronal plane ranged from 11 to 20 mm. No procedural complications were encountered. Post-procedural CT confirmed the optimal placement of the EVDs. Electromagnetic neuronavigation is feasible at the ICU bedside and can assist the insertion of bolt EVDs in this setting. The preference for a bolt EVD to be inserted in ICU—as is standard practice at this unit—should not prohibit patients from benefitting from image guidance if required.
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