Chemical terrorism: a primer for 2002.

Agents of chemical warfare have inflicted mass casualties on military and civilian personnel. Although not yet deployed on populations in the United States, stockpiles exist in countries that view the United States with enmity. There are four groups of such agents. The inhalants, chlorine and phosgene, were the earliest such weapons. Cyanide gases, because of their volatility, exert their lethal consequences in enclosed spaces. The vesicants and nerve agents, currently the most successful agents of chemical mass destruction, are the major focus of this overview. Mustard, the prototype of the vesicants, and its sulfur and nitrogen analogues are aerosolized liquids that linger on victims, incapacitating through their effects on the skin, eye, and respiratory tract. Mortality is low, but morbidity is substantial and mass casualties strain health care resources. Nerve agents, by contrast, are designed to kill. All, including Tabun, Sarin, Soman, and VX, are organophosphates that inactivate acetylcholinesterase. Widespread manifestations of peripheral and central neuronal dysfunction can be fatal without timely administration of antidotes. Decontamination, axiomatic in the management of agents of chemical warfare, is outlined, and therapeutic strategies are summarized in the light of current understanding.