Abstract
In thirteen patients the physiological deadspace: tidal volume ratio and the alveolar to arterial oxygen tension difference have been measured immediately before and during anaesthesia with halothane in oxygen after 30–70 minutes spontaneous respiration. The mean values were unchanged and it was concluded that the physiological shunt was also unaltered except in two instances which are discussed. In a further series of ten patients an average reduction of 27 ml in the physiological deadspace was measured as a result of endotracheal intubation.

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