Study guide
Traumatic Dissection, Carotid–Cavernous Fistula & Penetrating Injury
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
Traumatic Dissection, Carotid–Cavernous Fistula & Penetrating Injury
Key Takeaways Explain This Topic AI
Blunt carotid or vertebral injury can cause delayed thromboembolic stroke after trauma.
A direct carotid–cavernous fistula can produce orbital congestion, proptosis, bruit, and ophthalmoplegia.
Penetrating head injury requires assessment of hemorrhage, vascular injury, contamination, CSF leakage, and seizures.
An initially normal noncontrast head CT does not exclude a clinically important cervical vascular injury.
Last updated: October 2026
Look Beyond the Initial Hematoma
The TBI outline includes arterial dissection, carotid–cavernous fistula, and penetrating injury. Their important feature is a mismatch between mechanism or examination and a routine noncontrast head CT. A patient can have an injured cervical artery before an infarct becomes visible, or an abnormal fistula causing orbital venous hypertension without a large intraparenchymal hemorrhage. Repeated neurologic and ocular examination therefore remains useful after the initial resuscitation.
Begin with airway, oxygenation, hemorrhage control, cervical stability, and the broader trauma survey. Once immediate threats are addressed, determine whether the mechanism, fractures, wound path, or unexplained deficits warrant CTA or other vascular imaging under the trauma team's screening protocol. Do not assume that a patient without neck pain has intact cervical arteries; coma and sedation may make symptoms unavailable.
Blunt Cerebrovascular Injury
Blunt cerebrovascular injury (BCVI) includes carotid and vertebral injuries after stretching, compression, rotation, or direct impact. An intimal tear can produce mural hematoma, luminal narrowing, intraluminal thrombus, pseudoaneurysm, occlusion, or transection. Stroke may be delayed because embolization or progressive thrombosis occurs after the initial event.
High-risk cervical spine or skull-base injuries, neck trauma, and focal deficits unexplained by the brain imaging can prompt screening. Use a systematic local protocol rather than remembering only a single fracture type. CTA is commonly the first study. Equivocal findings may require repeat imaging or conventional angiography according to the clinical situation.
- Vascular finding Clinical concern Management reasoning
- Dissection or intraluminal thrombus Thromboembolic stroke Assess antithrombotic therapy when safe
- Pseudoaneurysm Embolism, enlargement, selected rupture risks Specialist surveillance and selected intervention
- Occlusion Ischemia or collateral-dependent circulation Assess brain perfusion and stroke options
- Active extravasation or transection Hemorrhage Urgent endovascular or surgical control
EAST recommends antithrombotic therapy for diagnosed BCVI when the clinical situation permits. The exact drug and timing depend on hemorrhage stability, other procedures, and competing risks. Antiplatelet therapy and anticoagulation are not interchangeable in every circumstance, but a concurrent TBI does not mean BCVI should automatically remain untreated indefinitely. Discuss the balance among trauma, neurosurgical, and stroke teams. Routine stenting is not recommended for every intermediate-grade injury; selected lesions require individualized intervention and follow-up.
Carotid–Cavernous Fistula
A direct carotid–cavernous fistula can follow traumatic disruption of the intracavernous internal carotid artery into the cavernous sinus. High-pressure arterial flow produces venous congestion. Findings include pulsatile proptosis, chemosis, an orbital bruit, raised intraocular pressure, diplopia, and cranial nerve palsies. The abducens nerve is particularly vulnerable within this region, but the full pattern depends on anatomy and drainage.
CTA or MRA can suggest the lesion; conventional angiography defines the fistula and venous drainage and can support treatment planning. Vision-threatening congestion, cortical venous reflux, or other dangerous features warrant prompt neurovascular and ophthalmic assessment. Management often uses endovascular techniques tailored to preserve necessary arterial flow while closing the abnormal connection. Do not treat an orbital bruit and progressive chemosis as ordinary postoperative swelling without investigating the vascular mechanism.
Distinguish a direct traumatic fistula from lower-flow dural fistulas, cavernous sinus thrombosis, orbital infection, and other causes of proptosis. Fever or systemic infection shifts the differential, while the trauma mechanism and pulsatility support a high-flow connection. Several processes can coexist after a severe facial injury.
Penetrating Brain Injury
Penetrating injury adds risks of vascular disruption, retained material, contamination, infection, CSF fistula, and early seizures. Assess wound trajectory and intracranial involvement with appropriate CT and vascular studies. Some traumatic vascular lesions can evolve or be missed initially, so follow-up imaging may be necessary depending on wound path and initial findings. Metallic fragments also change MRI safety; composition and location must be assessed before entering the scanner.
Do not remove an impaled object casually in the emergency department. It may be tamponading bleeding, and extraction requires a coordinated operative plan. Manage contamination, tetanus status, wound care, antimicrobial prophylaxis where indicated by the specialist protocol, and seizure prevention without inventing one universal regimen for every trajectory. Avoid unnecessary aggressive retrieval of deep fragments when the procedural damage may exceed benefit; surgical decisions depend on accessible devitalized tissue, mass lesions, contamination, and vascular risk.
A useful vignette is delayed hemiparesis after cervical trauma with an initially unchanged head CT. The appropriate next question is whether the neck vessels and cerebral circulation have been assessed. In a separate case, pulsatile orbital congestion after skull-base injury suggests a fistula and calls for neurovascular evaluation rather than empiric osmotherapy alone.
Source checked October 17, 2026: EAST BCVI guideline and ACS TBI guidance .