Investigation into the patterns of respiratory heat and moisture exchange in intubated patients, under general anaesthesia, is detailed. This paper gives the inspiratory and expiratory temperatures and humidities found in a non-rebreathing circuit near the valve and near the trachea. A model lung was constructed to control and determine factors which have been implicated in playing a major part in heat and moisture homeostasis within the respiratory tract. Laboratory and clinical results are compared.
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