The Effectiveness of Two Anesthesia Machines in the Water Generation of the Anesthesia Circuit during the Prolonged Low Flow Desflurane Anesthesia

BACKGROUND: Water is generated by a reaction of carbon dioxide and a carbon dioxide absorbent We evaluated the effectiveness of the anesthesia machines about the water generation which occurs to an anes- thetic circuit during the prolonged low flow anesthesia. METHODS: Fifteen patients were divided into three groups; group HHS (n=5) in which a hot heater system was equipped inside anesthesia machine, group WCD (n=5) in which a water catchment device was connected with anesthesia machine, and control group N(n=5)in which normal anesthesia machine was used without special device, and studies were performed with FGF 11 - min- low flow desflurane anesthesia for more than 6 hours. The water situation in an anesthe- sia circuit was observed during the operation and was compared after the operation between these groups. RESULTS: In an anesthesia circuit of the anesthesia machines inside there was no water in group HHS and WCD, but more water in group N. In an anesthesia circuit of the anesthesia machines outside there was little water in group WCD, but more water in group HHS and N. CONCLUSIONS: Two anesthesia machines, group HHS and WCD, were effective about reduction of water generation in an anesthesia circuit of the anesthesia machines inside during FGF 11 - min-I prolonged low flow desflurane anesthesia.