ICU Map

Acute Neurologic Deterioration & Brain Death Workflow

From acute GCS drop and herniation emergency measures to emergent CT, neurocritical intervention, and death by neurologic criteria determination.

RecognizeAssessDecideDifferentialInterveneReassess
Acute Neurological Deterioration (Drop in GCS >= 2 / Pupillary Asymmetry)
Assessment StepStabilize airway & circulation; check fingerstick glucose immediatelyExplore Topic
If GCS <= 8 or loss of protective airway reflexes, perform rapid sequence intubation with neuroprotective precautions (avoid hypoxia and hypotension, maintain MAP >= 80–90).
Decision PointCheck for signs of acute brain herniation or severely elevated ICP
Signs: unilateral dilated fixed pupil, decerebrate/decorticate posturing, Cushing's triad (bradycardia, severe hypertension, irregular respirations).
Differential Branches (2)
1Branch
Clinical ActionHerniation Present: Emergent Osmotherapy & Temporary Hyperventilation
Administer 3% Hypertonic Saline (250 mL IV over 10–15 min) or Mannitol 20% (1 g/kg IV rapid bolus). Elevate head of bed 30 degrees. Hyperventilate temporarily to PaCO2 30–35 mmHg.
Assessment StepTransport immediately for Emergent Non-Contrast Head CT
Identify mass effect, midline shift, intracranial hemorrhage (ICH, SDH, EDH, SAH), hydrocephalus, or large hemispheric infarction.
Decision PointEvaluate for emergent neurosurgical vs medical neurocritical management
Surgical: emergent hematoma evacuation, decompressive hemicraniectomy, or EVD for hydrocephalus. Medical: targeted temperature management, ICP monitoring, antiepileptic therapy.
Assessment StepCatastrophic Unrecoverable Injury: Formal Brain Death EvaluationExplore Topic
When clinical criteria met: irreversible coma, absence of all brainstem reflexes (pupillary, corneal, oculocephalic, oculovestibular, gag, cough), and an apnea test consistent with BD/DNC: no respiratory effort, arterial pH < 7.30, and PaCO2 >= 60 mmHg AND >= 20 mmHg above the appropriate pre-apnea/chronic baseline, after excluding hypothermia, shock, and confounding CNS depressants. If chronic CO2 retention is suspected and the premorbid baseline is unknown, ancillary testing is additionally required after an otherwise qualifying apnea test.
2Branch
Assessment StepNo Herniation: Perform urgent Non-Contrast CT Head & metabolic panel
Evaluate stroke / intracranial hemorrhage, sepsis-associated encephalopathy, hepatic encephalopathy (ammonia), uremia, and drug intoxication.

An educational representation of clinical reasoning, not a diagnostic algorithm or personalized medical advice — always apply clinical judgment and institutional protocols.

Caution

Escalate — Red Flags & Critical Warnings

  • Even a single episode of hypotension (SBP < 90 mmHg or MAP < 65) or hypoxemia (SpO2 < 90%) in acute brain injury doubles patient mortality — aggressively defend cerebral perfusion pressure (CPP = MAP - ICP >= 60–70 mmHg).
  • BD/DNC determination must NOT proceed until CNS-depressant drug effects are excluded. Use measured drug levels when available or allow at least 5 drug half-lives, extending this interval for renal/hepatic dysfunction, obesity, hypothermia, prolonged infusions, or active metabolites. EEG does not demonstrate sedative clearance and is not an accepted ancillary test for BD/DNC under the 2023 consensus guideline.

Related Bedside Clinical Problems (16)

Bedside Presentations
Acute Hypercapnia & Ventilatory Failure

Triaging rising PaCO2: distinguishing acute uncompensated acidemia from chronic compensation, identifying central vs pump vs dead-space failure, and titrating noninvasive ventilation.

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New Bradycardia & Conduction Blocks

Acute bradyarrhythmia management: identifying hemodynamic instability, distinguishing sinus node arrest vs high-grade AV block, medical chronotropic support (atropine, epinephrine), and emergent pacing.

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Acute Severe Hypertension & Hypertensive Emergencies

Differentiating hypertensive emergency (acute target organ damage) from asymptomatic hypertension: tailored pressure targets for SCAPE, aortic dissection, hemorrhagic stroke, and ischemic stroke.

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Linked Deep-Dive Topics (8)

Reference Knowledge
Altered Consciousness, Coma, & Delirium in the ICUneurology

ARAS neuroanatomy, structural vs toxic-metabolic coma, the comprehensive Coma Exam (pupils, cold calorics, posturing), FOUR score, and CAM-ICU delirium.

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Acute Ischemic Strokeneurology

Core vs penumbra dynamics, ASPECTS & CT perfusion, Tenecteplase/Alteplase thrombolysis, DAWN/DEFUSE 3 extended thrombectomy, BP targets, and malignant MCA hemicraniectomy.

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Intracranial Hemorrhage: ICH & SAHneurology

Spontaneous ICH vs Aneurysmal SAH, INTERACT-2/ATACH-2 blood pressure targets, emergency anticoagulant reversal, ENRICH minimally invasive evacuation, ISAT coiling, and Nimodipine for delayed cerebral ischemia.

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Intracranial Hypertension & Cerebral Edemaneurology

Monro-Kellie doctrine, ICP waveforms (P2>P1, Lundberg A-waves), CPP targets (60–70 mmHg), herniation syndromes, and the 4-tier BTF management protocol.

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Severe Traumatic Brain Injuryneurology

Severe TBI neurocritical care: prevent hypoxemia/hypotension, treat intracranial hypertension, individualize ventilation/CPP, use evidence-based short antiseizure prophylaxis when chosen, and escalate surgery when indicated.

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Brain Death / Death by Neurologic Criteria (BD/DNC)neurology

2023 AAN/AAP/CNS/SCCM consensus guideline: prerequisites, brainstem reflex examination, apnea testing on and off ECMO, valid ancillary tests, plus separate post-declaration donor-management principles.

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Status Epilepticusneurology

Recognition and time-sensitive escalation of care for prolonged or repeated seizures.

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ICU Sedation, Analgesia, Delirium & Liberationneurology

Analgesia-first sedation, light sedation targets, ABCDEF bundle, spontaneous breathing trials, and non-pharmacologic delirium mitigation.

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Evidence status

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