ICU Map

Serotonin Syndrome & Neuroleptic Malignant Syndrome — ICU Decision Pathway

Bedside differentiation and ICU management of serotonin toxicity versus neuroleptic malignant syndrome.

RecognizeAssessDecideDifferentialInterveneReassess
Hyperthermia, Rigidity and Medication Exposure
Assessment StepNeuromuscular examination is the fastest discriminatorExplore Topic
Serotonin toxicity usually has rapid onset, clonus and hyperreflexia (often lower-limb predominant) with autonomic excitation; NMS usually evolves over days with generalized lead-pipe rigidity and hyporeflexia/normal reflexes.
Clinical ActionStop the offending drug(s) immediately
Discontinue serotonergic agents in serotonin syndrome and dopamine antagonists in NMS; identify interacting drugs and recent dose changes.
Reassessment / LoopReassess response and escalate
Trend physiology and organ function; if the patient is worsening, revisit diagnosis, source control and rescue options rather than repeating ineffective therapy.

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

  • Escalate early for shock, rapidly progressive organ failure, dangerous ECG/airway findings or failure of initial therapy.

Related Bedside Clinical Problems (2)

Bedside Presentations
Hyperthermia, Rigidity and Medication Exposure

Differentiate serotonin toxicity from NMS by exposure, onset and neuromuscular findings, then stop the culprit and aggressively treat hyperthermia, agitation and organ complications.

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Agitation After Antipsychotic Exposure: QT Risk, EPS or NMS?

A complication-first bedside problem for an ICU patient exposed to antipsychotics who develops worsening agitation, rigidity, hyperthermia or electrical instability.

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Linked Deep-Dive Topics (1)

Reference Knowledge
Serotonin Syndrome & Neuroleptic Malignant Syndrometoxicology

Bedside differentiation and ICU management of serotonin toxicity versus neuroleptic malignant syndrome.

Explore Topic →

Evidence status

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