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Common Chemical Agent Threats Neurosurg Focus 12 (3):Article 3, 2002, Click here to return to Table of Contents Common chemical agent threats RANDALL R. MCCAFFERTY, M.D., AND PETER J. LENNARSON, M.D. Neurosurgical Services, Wright-Patterson Air Force Base, Ohio The events of September 11, 2001, highlight the fact that we live in precarious times. National and global aware- ness of the resolve and capabilities of terrorists has increased. The possibility that the civilian neurosurgeon may con- front a scenario involving the use of chemical warfare agents has heightened. The information reported in this paper serves as a primer on the recognition, decontamination, and treatment of trauma patients exposed to chemical war- fare agents. KEY WORDS • chemical warfare • terrorism • casualties • war Prior to World War I, chemical agents were considered tion to choking, blister, and blood agents, nerve agents but were infrequently used or ineffective products of war- were being produced in mass quantities. Despite signifi- fare. The Chinese used arsenical smokes as early as 1000 cant efforts by all parties to garner intelligence on the B.C. The Spartans used noxious smokes during the Pelo- capabilities of opposition forces, the magnitude of chemi- ponnesian War. During the American Civil War, numer- cal weapons programs was not fully understood until after ous proposals for the use of chlorine, sulfur, chloroform, the war. and hydrochloric and sulfuric acids were developed; how- Throughout the remainder of the 20th century, chemical ever, most proposals were likely never acted upon. weaponry continued to be developed and used in major With the onset of World War I, few people believed that wars around the world. Those involved in international the proposals and research into chemical weapons would organizations and treaties continued to define and restrict result in any significant battlefield operations. Initial at- various aspects of chemical weapons programs as well as tempts at chemical warfare were ineffective against oppo- in the more recently developing atomic and biological sition forces. In April and May of 1915, German forces programs. As recently as the Persian Gulf War, the alleged successfully deployed large stores of chlorine gas by wind use of nerve and mustard agents by Iraqi troops has been drift against Allied forces defending Ypres. Within the reported. Following that war, there have been reports of next 2 years, the chemical warfare techniques practiced chemical agent use ordered by Saddam Hussein against by German and Allied forces evolved into the use of Kurd and Shiite Muslims as well as proliferation of chem- phosgene gas, cyanogens, and vesicants. In addition, both ical weapons development in Libya. forces were supplied with chemical protective devices, Finally in 1993, the long awaited Chemical Weapons including gas masks. By Armistice Day in 1918, 26 mil- Convention was finalized. This treaty prohibited the de- lion casualties were recorded, approximately 1 million of velopment, production, stockpiling, and use of chemical which were attributable to gas warfare. weapons and provided for the verification and destruction In the years between World War I and World War II, of known stockpiles. Although 130 countries signed the new chemical weapons and protective and deployment ca- treaty, notable exceptions included Iraq and North Korea.3 pabilities were developed. All of the major nations in- Despite diplomatic efforts, chemical weapons will remain volved in World War I and several other countries devel- a threat in warfare and more recently have become a oped chemical weapons programs. Participants involved potential weapon of the terrorist. In 1994, a religious cult, in international conferences and treaties attempted to Aum Shinrikyo, released nerve gas in a residential area in define, limit, and/or prohibit the storage, development, Matsumoto, Japan, and in 1995 a sarin attack occurred in and training in the use and deployment of chemicals in a Tokyo subway. warfare. The ease with which chemical weapons can be obtained At the start of World War II, training in the use, storage, and manufactured increases the concern that nonmilitary and deployment of, and protection from chemical warfare people may be exposed to chemical agents. These agents was high. Although there was no major event involving are most effectively employed against individuals who the use of chemical agents during World War II, the capa- lack knowledge of their properties as well as to protect bilities of participating countries were impressive. In addi- against themselves and personnel against them. Cities, ports, and airfields are especially vulnerable civilian tar- gets. Following terrorist activity against the Pentagon and Abbreviations used in this paper: CNS = central nervous system; World Trade Center on September 11, 2001, President US = United States. Bush established a Homeland Defense program in the US. Neurosurg. Focus / Volume 12 / March, 2002 1 Unauthenticated | Downloaded 10/02/21 04:36 PM UTC R. R. McCafferty and P. J. Lennarson In light of these recent events, there is a real possibility in which groups of patients experience symptoms such as that civilian medical personnel may be exposed to patients runny nose, blurred vision, drooling, stomach cramps, and and circumstances involving chemical weapons. The fol- chest tightness, medical personnel must consider that mild lowing is a brief synopsis of those chemicals and their exposures have occurred as well as the possibility of a effects that a neurosurgeon may need to recognize and be contaminated working area, equipment, or clothing. able to treat when managing victims in a mass-casualty The first principle in treating patients exposed to a scenario. Chemical weapons may be classified in a variety nerve agent is to protect the medical personnel from expo- of different ways. For this discussion, the common nerve sure. This may require the donning of a protective mask agents, vesicants, blood agents, choking agents, and riot and hood, gloves, and impermeable clothing as the situa- control agents will be discussed. In addition, basic protec- tion dictates. Second, the source of nerve agent exposure tive mechanisms and decontamination procedures will be must be terminated. This may require that the patient be addressed. removed from a contaminated scene, as well as removal of clothing and personal items, cleansing of the patient, and/ NERVE AGENTS or placement of a protective mask. Ideally decontamina- tion would involve the use of diluted household bleach or The biological primary effect of nerve agents is their charcoal and resorptive resins. If these are not available, inhibition of the enzyme acetylcholinesterase.1 Although large amounts of water may be used to wash skin surfaces these agents are commonly used as insecticides and may and dilute the exposure, or tissue paper can be used to also be used in medicine, the chemicals of military impor- wipe away nerve agent resins. Care must be used to con- tance tend to be more potent and longer lasting. Nerve tain contaminated items to avoid exposure to other people. agents can be divided into G and V agents. Tabun (GA), Third, an airway should be established (or maintained). sarin (GB), soman (GD), and VX are examples of these Suction of large secretions and supplemental oxygen agents. Nerve agents are frequently clear and colorless in may be all that is necessary. Endotracheal intubation or a pure state and tend to liquify at moderate temperatures, cricothyroidotomy may be required in more critically ill although G agents much more likely than V agents can patients. present a vapor hazard. Nerve agents can be absorbed through any body surface Chemical Agent Antidotes area or through the gastrointestinal and respiratory tracts.3 The US military recognizes the following antidotes in The effects of nerve agents occur extremely rapidly when the treatment of nerve agent exposure: atropine, prali- inhaled as a vapor, but cutaneous absorption of liquid doxime chloride, and diazepam.2 Certain troops deployed nerve agents can take several minutes. Holding one’s in combat may be provided with antidote-containing au- breath and donning an effective mask can prevent expo- toinjectors for self- or buddy administration.3 In general sure to vaporized nerve agent. The liquid form of nerve medical treatment of the nerve agent–exposed patient agent can penetrate regular clothing extremely quickly. should be directed at combating the physiological effects Rapid removal of permeable clothing and decontamina- of the nerve agent, as well as those effects of the medica- tion of exposed body surfaces can markedly reduce the tions given to treat the patient. amount of the compound that is absorbed cutaneously. Atropine blocks the effects of acetylcholine at mus- These agents are rapidly inactivated by alkali and chlori- carinic receptors. Thus, atropine decreases secretions and nating compounds. Diluted chlorinating compounds may reverses the contraction of smooth muscle (that is, it re- be used to decontaminate patients and healthcare person- lieves bronchoconstriction and gastrointestinal hyper- nel, and stronger solutions may be used to clean clothing motility). Except in very high doses, atropine does not and equipment. resolve miosis. Field troops are given autoinjectors that Because the action of nerve agents is to inhibit acetyl- supply a 2-mg dose of atropine. In a civilian healthcare cholinesterase enzymes, symptoms are produced when setting, 2 mg of atropine should
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