Which anesthetic agent is the most flammable?

Cyclopropane is recognized as the most flammable anesthetic agent among the choices listed. This is due to its highly volatile nature, which allows it to ignite easily when exposed to open flames or high temperatures. Its flammability has historically posed significant risks, especially when used in combination with other agents or in environments where ignition sources may be present.

Halothane, sodium pentothal, and nitrous oxide, while they may have specific safety considerations, do not possess the same level of flammability as cyclopropane. Halothane, for example, is not considered flammable under normal conditions, and sodium pentothal (a barbiturate anesthetic) is a solid at room temperature and requires other means of administration. Nitrous oxide is generally used for its analgesic and anesthetic effects but is classified as a non-flammable gas, although it can support combustion. Therefore, understanding the properties of cyclopropane helps highlight its unique risk profile as the most flammable option in the context of anesthetic agents.