An anaesthetist calls you to request an ICU bed for a patient suffering from spina bifida who has just suffered what is believed to be an adverse reaction shortly after induction of anaesthesia. Classify allergic reactions. In this viva candidates were asked to explain and classify allergic reactions, the pharmacological basis to their treatment (eg what are the mechanisms by which adrenaline is used for anaphylaxis) and to list common agents (latex was commonly overlooked) in ICU practice that are associated with allergic reactions.