Cholinergic crisis: key signs that threaten morbidity, mortality, and quality of life
Severe bronchorrhea/bronchospasm with respiratory failure, miosis, bradycardia/hypotension, muscle fasciculations progressing to weakness/paralysis, seizures/coma, and profuse secretions (SLUDGE-M) are the defining, life‑threatening signs of a cholinergic crisis. 1
- Central nervous system (CNS)
- Anxiety, confusion → seizures, coma, respiratory depression/arrest 1
- Eyes
- Marked miosis (pinpoint pupils), blurred vision 1
- Cardiovascular
- Early tachycardia/hypertension (rare/brief) → predominant bradycardia, AV block, prolonged QT, hypotension; malignant arrhythmias possible 1
- Respiratory (highest mortality risk)
- Upper airway irritation, copious oral/airway secretions (bronchorrhea), bronchospasm, pulmonary edema; respiratory muscle paralysis → ventilatory failure 1
- Musculoskeletal (nicotinic)
- Generalized fasciculations → weakness → flaccid paralysis (including diaphragm) 1
- Gastrointestinal/urinary (muscarinic)
- Nausea, vomiting, abdominal cramps, severe diarrhea; urinary incontinence 1
- Secretory glands
- Excessive salivation, lacrimation, sweating 1
Common pitfalls/caveats to avoid:
- Misattributing respiratory failure to pneumonia alone; in cholinergic crisis, look for triad of miosis, bradycardia, and copious secretions with low cholinesterase activity when available 1, 2.
- Overlooking biphasic cardiac course; anticipate late bradyarrhythmias and QT prolongation with malignant arrhythmias risk 1.
- Missing neuromuscular progression from fasciculations to paralysis, which predicts need for ventilation and drives mortality 1.
- Recognize triggers beyond nerve agents: therapeutic/overdose acetylcholinesterase inhibitors (pyridostigmine, distigmine, rivastigmine) and cholinergic agonists; high-risk settings include renal failure or bowel obstruction causing drug accumulation 3, 4, 2.