ICU Map

Altered Consciousness

From securing the basics to categorizing structural, toxic-metabolic, infectious, and seizure-related causes.

RecognizeAssessDecideDifferentialInterveneReassess
Altered Consciousness
Assessment StepAssess airway and hemodynamics first
Airway, breathing, and circulation before further workup — a falling level of consciousness threatens airway protection.
Assessment StepCheck a fingerstick glucose immediately
Hypoglycemia is rapidly reversible and easy to miss if the workup jumps straight to imaging.
Assessment StepPerform a focused neurologic exam
Pupils, symmetry, focal deficits, Glasgow Coma Scale, and any signs of trauma.
Decision PointIdentify likely category
The exam findings above usually place the picture into one of four broad categories.
Differential Branches (4)
1Branch
Decision PointStructural / focal causeExplore Topic
An asymmetric exam or new focal deficit points here — obtain emergent neuroimaging.
Diagnosis / EtiologyStroke / intracranial hemorrhage
Diagnosis / EtiologyMass lesion / herniation
2Branch
Decision PointToxic-metabolic (diffuse, symmetric)
A symmetric exam without focal signs points here — review medications and metabolic labs.
Diagnosis / EtiologySedative / opioid effect
Diagnosis / EtiologyHepatic / uremic encephalopathyExplore Topic
Diagnosis / EtiologySevere hypo- or hyperglycemia
3Branch
Physiologic MechanismInfectiousExplore Topic
Sepsis-associated encephalopathy or CNS infection — check for fever, meningismus, and a septic source.
4Branch
Physiologic MechanismSeizure / postictal state
Consider a witnessed or unwitnessed seizure, especially with a gradually improving exam over time.

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

  • New focal neurologic deficit or asymmetric pupils — obtain emergent neuroimaging; do not attribute the picture to metabolic causes without excluding a structural lesion.
  • GCS ≤ 8 or loss of airway-protective reflexes — secure the airway before continuing further in the workup.

Related Bedside Clinical Problems (26)

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 Tachycardia & Tachyarrhythmias

Algorithmic triage of acute heart rates > 100–150 bpm: stability screen (immediate cardioversion if unstable), narrow vs wide QRS differentiation, Brugada VT rules, and sinus tachycardia etiology search.

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Acute Altered Mental Status & ICU Delirium

Systematic neurologic evaluation: immediate metabolic/toxic screening (glucose, hypoxia, hypercapnia), nonconvulsive status epilepticus exclusion, structural CT triage, and CAM-ICU delirium management.

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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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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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Acute Liver Failure (ALF)gi-hepatic

Hyperammonemia, cytotoxic cerebral edema, balanced coagulopathy, N-acetylcysteine, 3% saline neuroprotection, CRRT ammonia clearance, and King's College transplant criteria.

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Endocrine Emergencies in Critical Careendocrine-metabolic

Bedside recognition and organ-support priorities for thyroid storm, myxedema coma, adrenal crisis, pheochromocytoma crisis, and severe hypercalcemia.

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Toxicologic Emergencies in Critical Caretoxicology

Resuscitate first, identify toxidromes and ECG/acid-base threats, use toxin-specific antidotes, and escalate early to poison-center, extracorporeal, or ECLS support when physiology demands it.

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Diabetic Ketoacidosis (DKA)endocrine-metabolic

Pathophysiology, SGLT2i euglycemic DKA, balanced fluid resuscitation, potassium-before-insulin safety rules, dextrose addition kinetics, and subcutaneous transition.

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Sepsisinfectious-disease

Life-threatening organ dysfunction caused by a dysregulated host response to infection — recognized by an acute rise in SOFA score, not by infection plus fever alone.

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Acute Kidney Injury in Critical Carerenal

Sepsis-AKI microcirculatory decoupling, KDIGO staging, Furosemide Stress Test (FST), urine microscopy, and the AEIOU dialysis threshold framework.

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