Which agent type is characterized by symptoms such as dizziness, weakness, anxiety, nausea, tachypnea, seizures, and possible respiratory arrest?

• A. Vesicants
• B. Blood agents
• C. Pulmonary agents
• D. Biological agents

Answer: (B)

The symptoms described point to an agent that interferes with the body's use of oxygen at the cellular level, leading to rapid brain and organ hypoxia. Blood agents, such as hydrogen cyanide, work by blocking the mitochondrial electron transport chain, causing histotoxic hypoxia. This produces a quick progression of dizziness, weakness, anxiety, and nausea, with tachypnea as the body tries to compensate. As oxygen utilization remains impaired, the CNS can seize up, leading to seizures and, without intervention, respiratory arrest. In contrast, vesicants mainly cause skin and mucous membrane irritation with blistering, pulmonary agents primarily irritate the airways and can cause edema, and biological agents typically present with fever and longer incubation periods. Therefore, the described pattern best fits blood agents.