The signs and stages of anaesthesia. No. 1.

A brief sequence of a female patient being anaesthetised is shown. Most of the film looks at the theory of the stages of anaesthesia using Guedel's chart using diagrams. It is the third stage when surgery can commence (this is in turn subdivided into planes). The fourth stage is respiratory failure and potentially death. Within each stage respiration is noted and the action of the diaphram and the thorax. The theory is shown in practice as a male patient is shown anaesthetised. The patient's breathing is observed even when covered in surgical gowns. Reflexes relating to the eye are demonstrated. The action of pre-medication on the size of the pupil is discussed. The end.