Sensitivity to intravenous anaesthetics: a report of three cases.

Three patients with sensitivity to an intravenous anaesthetic-thiopentone, propanidid, and Althesin (alphadolone and alphaxalone)-are described. In the cases of thiopentone and Althesin the reaction was characterized by cardiovascular collapse, while bronchospasm also occurred with thiopentone. The reaction to propanidid was a direct skin sensitivity. All patients had a personal or family history of asthma and all had been previously exposed to the offending drug. A leucocyte challenge test showed an allergic response to thiopentone and Althesin in two patients but gave a negative result in the patient with the skin reaction. Allergic reactions can occur to all types of intravenous anaesthetics in a few patients.