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Nerve Agent Exposure: Early Symptoms and Immediate Response

Recognizing Mild-to-Moderate Nerve Agent Exposure

Nerve agents (sarin, VX, tabun, soman, Novichok) inhibit acetylcholinesterase, causing cholinergic crisis. Early recognition saves lives. Symptoms progress from mild to severe rapidly.

Mild / Early Symptoms (SLUDGE + CNS)

  • Salivation (excessive drooling)
  • Lacrimation (tearing)
  • Urination (involuntary)
  • Defecation / Diaphoresis (profuse sweating)
  • Gastrointestinal distress (nausea, vomiting, cramps, diarrhea)
  • Emesis / Emphysema (bronchospasm, wheezing, excessive bronchial secretions)
  • Miosis (pinpoint pupils) — hallmark sign
  • Blurred / dim vision (due to miosis + ciliary spasm)
  • Headache, dizziness, confusion, anxiety
  • Rhinorrhea (runny nose)
  • Muscle fasciculations / weakness (especially face, limbs)
  • Fatigue, dyspnea

Severe / Late Symptoms

  • Loss of consciousness, seizures, apnea, flaccid paralysis, cardiac arrest.

Immediate Actions (MARCH + Antidotes)

  1. Move upwind / uphill; Mask (protective mask) if available.
  2. Airway: Position recovery; suction secretions.
  3. Respiration: Assist ventilation if needed (bag-valve-mask).
  4. Circulation: Monitor pulse; IV access.
  5. Hypothermia/Head injury prevention.
  6. Administer Antidote Kit (Auto-injector) ASAP:
    • Atropine 2 mg IM/IV (repeat q5–10 min until secretions dry, HR >80, SBP >90).
    • Pralidoxime (2-PAM) 600 mg IM / 1–2 g IV (reverses AChE inhibition if given early).
    • Diazepam/Midazolam for seizure prophylaxis/control.
  7. Decontaminate: Remove all clothing (90%+ contamination removal); flush skin/eyes with copious water/0.5% hypochlorite.
  8. Evacuate to higher echelon care; continue atropine titration.

Key Points

  • Symptoms can appear within seconds (vapor) to hours (liquid skin exposure).
  • Miosis + SLUDGE = Nerve agent until proven otherwise.
  • Atropine treats muscarinic effects; 2-PAM treats nicotinic (muscle) effects.
  • Multiple auto-injector doses may be needed; carry extras.

This is reference information. In a real event, follow local emergency protocols and command directives.

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