Nerve Agents

Excerpt

Nerve agents are highly toxic chemical compounds, including both naturally derived organophosphates and synthetic agents, commonly used as chemical weapons or in agriculture. They share a common mechanism as potent acetylcholinesterase inhibitors that cause excessive accumulation of acetylcholine in both autonomic and neuromuscular synapses, leading to overstimulation of muscarinic and nicotinic receptors.

Patients affected by nerve agents present primarily with symptoms of excess acetylcholine, with the most severe symptoms including increased respiratory secretions and bronchospasm, respiratory failure, and paralysis. Diagnosis of nerve agent poisoning is based on history and identification of a cholinergic toxidrome on physical exam, while laboratory tests such as cholinesterase assays may further support the diagnosis but are not readily available in most settings. Treatment focuses on aggressive supportive care, airway management, and early administration of the appropriate antidotes, including atropine, which antagonizes muscarinic receptors, and pralidoxime, which reactivates acetylcholinesterase if administered early. Benzodiazepines are preferred for the management of seizures. Decontamination with soap, water, or specialized agents like Reactive Skin Decontamination Lotion is crucial to prevent ongoing absorption.

Prolonged exposure is associated with long-term neurologic and psychological effects, including insomnia, anxiety, impaired memory, and vision disturbances. Mortality is primarily due to respiratory failure, emphasizing the need for early intervention, particularly in mass casualty settings where bioterrorism may be involved. Familiarity with nerve agent toxicity and preparedness with antidotes is essential for healthcare and emergency response teams.