Study guide
Fulminant Demyelination & Autoimmune Encephalitis
ABPN Neurocritical Care Study Guide Exam
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1 Chapter 1: Neurologic Examination & Coma Assessment in the ICU
Current Examination, Blueprint & Preparation Neurologic Examination in Critically Ill Patients Coma Evaluation & Consciousness Alterations Delirium & Toxic-Metabolic Encephalopathy in the ICU
2 Chapter 2: Cerebral Physiology & Intracranial Dynamics
Cerebral Blood Flow, Metabolism & Autoregulation Intracranial Pressure & Compliance Cerebral Edema & Herniation Syndromes
3 Chapter 3: Intracranial Hypertension & Cerebral Perfusion Management
Tiered ICP Management Protocols Hyperosmolar Therapy & Fluid Management Advanced & Refractory ICP Interventions
4 Chapter 4: Airway, Mechanical Ventilation & Pulmonary ICU Management
Emergency Airway Management & Neuro-Intubation Mechanical Ventilation Strategies in Acute Brain Injury Tracheostomy & Ventilator Weaning in Neurocritical Care Pulmonary Complications in the Neuro-ICU Obstructive Lung Disease, Pulmonary Hypertension & Bronchoscopy
5 Chapter 5: Hemodynamics, Shock & Cardiovascular Management
Hemodynamic Monitoring & Blood Pressure Targets Vasoactive Agents: Inotropes, Vasopressors & Antihypertensives Cardiac Complications of Brain Injury
6 Chapter 6: Neuropharmacology, Analgesia & Sedation
ICU Sedation & Analgesia Neuromuscular Blockade & Monitoring Propofol Infusion Syndrome & Drug Toxicities Antiseizure Drug Pharmacology in the ICU
7 Bleeding, Thrombosis & Hematologic Emergencies
Warfarin & Heparin Reversal Direct Oral Anticoagulant (DOAC) Reversal Antiplatelet Management & Platelet Dysfunction Venous Thromboembolism Prophylaxis & Management Transfusion, Coagulopathy, TMA & Cellular-Therapy Neurotoxicity
8 Chapter 8: Systemic ICU Care, Fluids, Electrolytes & Endocrine
Hyponatremia & Osmoregulation: SIADH vs Cerebral Salt Wasting Diabetes Insipidus, Hypernatremia & Endocrine Crises Critical Care Prophylaxis, Nutrition & Infection Prevention
9 Systemic Trauma & Environmental Injury
Polytrauma, Chest Injury & Abdominal Hemorrhage Burns, Electrical Injury & Hanging
10 Cardiac Emergencies & Mechanical Support
IABP, Ventricular Devices & ECMO Acute Coronary, Valvular, Rhythm & Aortic Emergencies
11 Kidney Injury, Acid–Base & Renal Replacement
Acute Kidney Injury & Renal Drug Clearance Acid–Base Disorders, Electrolytes & Renal Replacement
12 Systemic Infection & Endocrine Emergencies
Sepsis, Endocarditis & Antimicrobial Principles Thyroid, Adrenal & Dysglycemic Emergencies
13 Gastrointestinal & Hepatic Emergencies
Acute Abdomen, GI Bleeding & Abdominal Compartment Syndrome Acute Liver Failure, Cirrhosis & Hepatic Drug Effects
14 Chapter 9: Neuroimaging in the Neuro-ICU
Non-Contrast CT & CT Angiography CT Perfusion & Advanced Perfusion Imaging Magnetic Resonance Imaging in Critical Illness
15 Chapter 10: Electrophysiology & Neuromonitoring
Continuous EEG & ACNS Standardized Critical Care Terminology Invasive Neuromonitoring: ICP & External Ventricular Drains Multimodal Monitoring: PbtO2, Microdialysis & Transcranial Doppler
16 Angiography, Electrodiagnosis & CSF Analysis
Conventional Angiography & Cranial–Spinal Shunts EMG, Nerve Conduction & Acute Muscle Disease CSF Analysis: Infection, Inflammation & Hemorrhage
17 Chapter 11: Bedside Procedures, Ultrasound & Death by Neurologic Criteria
Critical Care Procedural Skills Critical Care Ultrasound & Echocardiography Determination of Death by Neurologic Criteria
18 Chapter 12: Acute Ischemic Stroke & Reperfusion Therapies
Acute Ischemic Stroke Management & Thrombolysis Endovascular Thrombectomy & Large Vessel Occlusion Malignant Hemispheric & Cerebellar Infarction
19 Chapter 13: Spontaneous Intracerebral Hemorrhage & Intraventricular Hemorrhage
Acute Intraparenchymal Hemorrhage Management Intraventricular Hemorrhage & Hydrocephalus Surgical Evacuation & Minimally Invasive Surgery in ICH
20 Chapter 14: Aneurysmal Subarachnoid Hemorrhage & Delayed Cerebral Ischemia
Aneurysmal Subarachnoid Hemorrhage: Acute Resuscitation & Securing Delayed Cerebral Ischemia & Cerebral Vasospasm Non-Aneurysmal Subarachnoid Hemorrhage & Vascular Malformations
21 Venous, Spinal & Traumatic Vascular Disease
Cerebral Venous Thrombosis & Spinal Cord Infarction Traumatic Dissection, Carotid–Cavernous Fistula & Penetrating Injury
22 Chapter 15: Traumatic Brain & Spinal Cord Injury
Severe Traumatic Brain Injury & Contusions Acute Traumatic Spinal Cord Injury & Neurogenic Shock Spine Trauma, Fractures & Cord Syndromes
23 Chapter 16: Status Epilepticus, Seizures & Neuromuscular Emergencies
Status Epilepticus: Convulsive & Non-Convulsive Refractory & Super-Refractory Status Epilepticus Acute Neuromuscular Respiratory Failure
24 Chapter 17: Post-Cardiac Arrest Care, CNS Infections & Encephalitis
Targeted Temperature Management & Post-Cardiac Arrest Care Post-Cardiac Arrest Neuroprognostication Acute CNS Infections, Encephalitis & Inflammatory Emergencies
25 Neuroinflammation & Neurooncology
Fulminant Demyelination & Autoimmune Encephalitis Brain, Spinal & Leptomeningeal Cancer Emergencies
26 Pregnancy, Transplantation & Pediatric Care
Pregnancy, Postpartum & Post-Transplant Neurologic Care Pediatric Neurocritical Care
27 Chapter 18: Neurosurgical & Perioperative Emergencies
Postoperative Neurosurgical Complications Device Complications: EVDs, Shunts & ICP Monitors Cerebral Hyperperfusion Syndrome & Post-Interventional Emergencies
28 Chapter 19: Ethics, Palliative Care & Organ Donation in the Neuro-ICU
Communication, Surrogate Decision-Making & Conflict Resolution Neuroprognostication Ethics, Withdrawal of Life Support & Palliative Care Organ Donation & Management of the Deceased Donor
Fulminant Demyelination & Autoimmune Encephalitis
Key Takeaways Explain This Topic AI
Fulminant inflammatory demyelination can involve brain, optic nerves, or spinal cord and may require ICU support.
Exclude a compressive lesion in acute myelopathy before assuming inflammatory myelitis.
Normal initial MRI or negative initial antibody testing does not exclude autoimmune encephalitis.
Antibody results require interpretation in the clinical phenotype, specimen, assay, and treatment context.
Last updated: October 2026
Recognize an Inflammatory Emergency
The outline names fulminant demyelinating disease and autoimmune encephalitis separately from ordinary toxic-metabolic coma. Severe inflammatory disease can produce extensive edema, acute myelopathy, brainstem dysfunction, respiratory weakness, or refractory seizures. Stabilize airway, ventilation, circulation, and seizures while evaluating the cause. An immune hypothesis should not delay empirical treatment of a plausible serious infection or urgent exclusion of spinal compression.
Ask how quickly the syndrome evolved and which systems are affected. Multifocal neurologic deficits with encephalopathy suggest a different process from a single abrupt vascular-territory deficit. A spinal sensory level, sphincter dysfunction, and evolving weakness suggest cord disease. However, the tempo overlaps across infection, vascular disease, neoplasm, and inflammation; no single feature proves an immune cause.
Fulminant Demyelinating Syndromes
Acute disseminated encephalomyelitis (ADEM) typically combines encephalopathy with multifocal neurologic dysfunction and inflammatory demyelinating lesions. It is more common in children but can occur in adults. Severe hemorrhagic variants can progress rapidly with edema and mass effect. Assess brain and spinal imaging and seek infection or other mimics when the clinical course is atypical.
Severe multiple sclerosis , aquaporin-4-IgG-associated neuromyelitis optica spectrum disorder , and MOG antibody-associated disease can present with major optic, brainstem, or spinal deficits. These labels are not interchangeable. Longitudinally extensive cord lesions, area postrema symptoms, optic-nerve patterns, and antibody results can help distinguish them, but lesion length alone is not a complete diagnosis.
In acute myelopathy, MRI must assess compression, hemorrhage, infarction, infection, and inflammation. An apparently central neurologic weakness can also coexist with respiratory muscle failure or autonomic dysfunction. Monitor bulbar function, respiratory mechanics when feasible, bladder status, and cardiovascular stability. Do not wait for severe blood-gas abnormalities when clinical respiratory reserve is declining.
Investigation and Treatment Reasoning
Assessment Question it helps answer
Brain and spine MRI Is there inflammation, mass effect, compression, or another structural pattern?
CSF when safe Is there inflammation or evidence of infection, and are targeted immune studies indicated?
Serum and selected CSF antibodies Does a validated result support the clinical phenotype?
EEG Are seizures contributing to the altered consciousness?
Systemic evaluation Is there infection, malignancy, drug toxicity, or another trigger?
High-dose corticosteroids are commonly used for severe inflammatory demyelination, with plasma exchange considered for severe or insufficiently responsive attacks and other therapies selected by syndrome and response. These are specialist decisions with infection, glucose, bleeding, and hemodynamic risks. The fact that corticosteroids are harmful for traumatic cerebral edema does not make them inappropriate for a separate inflammatory indication.
Autoimmune Encephalitis
Autoimmune encephalitis may present with subacute memory change, altered mental state, psychiatric symptoms, seizures, movement abnormalities, sleep disturbance, dysautonomia, or hypoventilation. Anti-NMDAR disease can produce prominent dyskinesias and autonomic instability. LGI1-associated disease may include faciobrachial dystonic seizures and hyponatremia. Other syndromes have different tumor associations and treatment responses.
MRI can be normal initially. CSF inflammation can be modest or absent, and antibody panels are neither perfectly sensitive nor perfectly specific. Interpret a positive result in the phenotype and specimen context; low-specificity isolated serum findings can mislead. Send paired or targeted serum and CSF testing when appropriate and assess for an associated neoplasm according to the syndrome, age, and clinical findings.
When infectious encephalitis remains plausible, begin appropriate empirical antimicrobials while testing proceeds. An early negative HSV PCR may require repeat sampling if suspicion remains. Once the immune diagnosis is sufficiently supported and important alternatives are addressed, expert recommendations support prompt first-line immunotherapy, commonly corticosteroids, IVIG, or plasma exchange. Escalation such as rituximab depends on response and the presumed immune mechanism; it is not a mandatory identical sequence for every antibody.
ICU Complications and Recovery
Manage seizures, aspiration risk, infection, dysautonomia, immobility, nutrition, and medication effects. Abnormal movements are not automatically seizures; correlate with EEG and bedside findings. Antipsychotic sensitivity, QT effects, and sedative accumulation may complicate care. Recovery can be slow even after the acute inflammatory process is treated, so distinguish prolonged recovery from evidence of irreversible injury.
In a vignette with psychiatric change followed by seizures, dyskinesias, autonomic instability, and hypoventilation, recognize an encephalitic syndrome and investigate immune and infectious causes. A normal initial MRI does not justify dismissing the condition as primary psychiatric disease. In a separate rapidly progressive myelopathy, the immediate priority is to exclude compression and assess respiratory and autonomic risks before choosing a disease-specific immune treatment.
Sources checked October 17, 2026: autoimmune encephalitis acute-management recommendations and 2024 Canadian consensus . Recommendations include expert consensus where trial evidence is limited.