Inflammable antiseptics and theatre fires.

This paper describes an investigation designed to find out if theatre fires could be started by the antiseptic painted on the patient's skin being ignited by cautery or diathermy. It was found that hot wire cautery or diathermy generated enough heat to ignite all alcohol-based antiseptics even if these contained as little as 20 per cent alcohol. They could also cause iodine to explode in the presence of nitrous oxide, and nobecutane to explode in the presence of nitrous oxide or increased oxygen. The likelihood of these combinations causing fires is discussed, and it is recommended that when diathermy or cautery is to be used near the surface of the body, either an aqueous-based antiseptic is used or if spirit solutions are required they are carefully dried off before proceeding.