Name two broad categories of chemical agents commonly considered in EMS CBRN incidents and give a typical symptom for each.

• A. Nerve agents and choking/asphyxiants; nerve agents cause SLUDGE and miosis.
• B. Choking/asphyxiants: coughing and chest tightness; Nerve agents: SLUDGE and miosis.
• C. Nerve agents and blister agents; both cause skin blisters.
• D. Biological agents and chemical agents; biological cause fever.

Answer: (B)

In EMS CBRN incidents, recognizing two broad chemical-agent categories helps you quickly identify likely effects and guide initial care. Nerve agents rapidly disrupt the nervous system and produce a cholinergic toxidrome. The hallmark signs are SLUDGE—Salivation, Lacrimation, Urination, Defecation, GI upset, and Emesis—and miosis (pinpoint pupils). Choking/asphyxiants primarily irritate and constrict the airways, leading to coughing and chest tightness with difficulty breathing. This pairing fits best because it matches the two common mechanisms and their typical, early symptom patterns, aiding rapid recognition and appropriate response. Other options mix categories that don’t align with the typical symptom profiles of these agents.