Occupational exposure to desflurane and isoflurane during cardiopulmonary bypass: is the gas outlet of the membrane oxygenator an operating theatre pollution hazard? |
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Authors: | Hoerauf K; Harth M; Wild K; Hobbhahn J |
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Institution: | University Hospital, Department of Anaesthesiology (B), University Hospital of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria |
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Abstract: | We have compared occupational exposure to isoflurane and desflurane during
cardiopulmonary bypass, with and without a scavenging system at the
membrane oxygenator outlet. Trace concentrations of volatile anaesthetics
were measured by a direct reading instrument in 40 elective heart surgery
procedures. Measurements were obtained in the breathing zones of the
anaesthetist and perfusionist. When a scavenging system was used, median
desflurane values were less than 0.3 ppm and isoflurane values less than
0.2 ppm. Without a scavenging system values were, in general, three-
(isoflurane) to five- (desflurane) fold higher. We conclude that the use of
a scavenging system at the membrane oxygenator outlet can reduce
occupational exposure to volatile anaesthetics. We therefore recommend
routine use of scavenging devices during cardiopulmonary bypass.
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