AbstractGet full access to this articleView all access options for this article.Get accessReferences1. Gedeon A , Mebius C. The hygroscopic condenser humidifier. Anaesthesia 1979;34:1043–1047.2. Dery R , Pelletier J , Jacques A , Clavet M , Houde JJ . Humidity in anesthesiology. III. Heat and moisture patterns in the respiratory tract during anaesthesia with the semi-closed system. Can Anaesth Soc J 1967;14:287–298.