ICU Map
neurologic

Rapidly Progressive Weakness / Impending Ventilatory Failure

Bedside assessment and airway decision-making in rapidly ascending or fatiguable weakness risking ventilatory pump failure.

Rapidly progressive neuromuscular weakness in the ICU signals impending ventilatory pump failure. Unlike parenchymal lung disease, patients with neuromuscular failure maintain normal arterial blood gases until terminal diaphragmatic exhaustion occurs. Bedside decision-making relies on serial pulmonary mechanics, cough strength, bulbar airway protection, and autonomic stability.

Caution

Medication hazard: Avoid succinylcholine in GBS and other denervation states because extrajunctional receptor up-regulation can produce severe hyperkalemia. In myasthenia gravis, neuromuscular-blocker sensitivity is different; use reduced, titrated non-depolarizing doses with monitoring when paralysis is needed.

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SERIAL RESPIRATORY MECHANICS + BULBAR ASSESSMENT

  • Forced Vital Capacity (FVC): < 20 mL/kg represents critical ventilatory reserve loss indicating elective intubation.

  • Negative Inspiratory Force (NIF/MIP): Worse than -30 cmH2O (-20 to 0 cmH2O) indicates inspiratory muscle exhaustion.

  • Maximum Expiratory Pressure (MEP): < 40 cmH2O indicates loss of abdominal expulsive force predicting ineffective cough and secretion asphyxiation.

  • Single-Breath Count: Inability to count to 20 on a single breath correlates with FVC < 20 mL/kg.

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BULBAR & TRAJECTORY ASSESSMENT

  • Bulbar Failure Indicators: Dysphagia, nasal speech, pooling of oral secretions, weak cough, inability to clear saliva.

  • Neck Flexor Weakness: Inability to lift head from pillow strongly correlates with impending diaphragmatic paralysis.

  • Trajectory: A rapid downward trajectory over 6–12 hours supersedes single threshold numbers.

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SYNDROMIC DIFFERENTIATION

  • Guillain-Barré Syndrome (GBS): Ascending symmetric flaccid paralysis, areflexia, autonomic blood pressure lability, bradyarrhythmias.

  • Myasthenic Crisis: Fatiguable weakness, ptosis, diplopia, prominent bulbar weakness, triggered by infection, surgery, or medications.

  • Botulism: Acute descending paralysis, early dilated pupils, dry mouth, clear sensorium.

  • ICU-Acquired Weakness (CIP/CIM): Diffuse weakness in septic or prolonged mechanically ventilated patients (MRC score < 48/60).

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TARGETED IMMUNOTHERAPY & RESCUE

Evidence status

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Actionable Clinical Workflows (21)

Step-by-step ICU Processes
Mechanical Ventilation Initiation Workflow

From post-intubation verification and lung-protective settings to mechanics optimization.

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Mechanical Ventilation Liberation & Weaning

From readiness screening and spontaneous breathing trials to extubation and post-extubation support.

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Prone Positioning Protocol for Severe ARDS

From eligibility screening and team preparation to 16-hour proning cycles and response evaluation.

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Noninvasive Respiratory Support Escalation & Intubation Decision

From initial noninvasive modality selection to ROX index tracking and timely intubation triggers.

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Deep-Dive Topic Destinations (9)

Reference Knowledge
ICU-Acquired Weakness (CIP/CIM)neurology

Critical illness polyneuropathy and myopathy: recognition, risk reduction, diagnostic approach, ventilator liberation, rehabilitation, and prognosis.

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Myasthenia Gravis & Myasthenic Crisisneurology

Dedicated ICU management of myasthenic crisis: respiratory mechanics, airway timing, IVIG/plasma exchange, trigger control, medication hazards, and extubation.

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Guillain–Barré Syndrome (GBS)neurology

Dedicated ICU GBS care: respiratory surveillance, autonomic instability, IVIG/plasma exchange, airway strategy, pain/DVT prevention, and complications.

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Invasive Mechanical Ventilationrespiratory

Complete clinical topic overview. For the full 10-level interactive course, visit Master MV. Covers core ventilator modes, respiratory mechanics (Cstat, Raw, driving pressure), waveform dyssynchrony analysis, VILI prevention, and liberation protocols.

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Hypercapnic Respiratory Failurerespiratory

Mechanism-based diagnosis of acute and acute-on-chronic hypercapnia, controlled oxygen, NIV, invasive ventilation, auto-PEEP troubleshooting, neuromuscular monitoring, and post-acute planning.

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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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Severe Sodium Disorders: Hyponatremia & Hypernatremiarenal

Tonicity assessment, etiologic classification, 3% hypertonic saline bolus protocols, individualized ODS-safe correction limits, DDAVP relowering, DI diagnostics, and evidence-aware hypernatremia correction.

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Severe Hyperkalemia in Critical Illnessrenal

Nernst resting potential mechanics, ECG progression, the 3-step resuscitation framework (Stabilize, Shift, Eliminate), and post-dialysis rebound kinetics.

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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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