Abstract
Airway heat and humidity were investigated in patients whose anaesthesia involved endotracheal intubation. When delivered gases were saturated with water vapour, inspiratory moisture gain kept pace with temperature increase, and all relative humidities remained high. This occurred even when the supplied gas was saturated at room temperature, and the inspiratory temperatures rose more than 5°C en route to the trachea through the artificial airway. The findings are related to possible effects on the respiratory mucosa, and to alterations in total body heat balance.
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