CLINICAL ANAESTHESIA AND THE MULTIPLE-GAUZE CONDENSER-HUMIDIFIER

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Abstract
Airway temperatures and humidities were examined during adult anaesthesia before and after use of a heat-and-moisture exchanger (HME). The unmodified anaesthetic circuits delivered gases at room temperature, with three levels of relative humidity. End-phase temperatures and absolute humidities were higher with the HME in circuit, most noticeably when the inspired gases were saturated. Use of the HME with a dry non-rebreathing system gave minimal improvement in the end-inspired humidity of gases entering the trachea, and the respiratory heat loss remained high.

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