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British Journal of Anaesthesia, 2001, Vol. 86, No. 1 124-126
© 2001 The Board of Management and Trustees of the British Journal of Anaesthesia

Waste gas exposure to sevoflurane and nitrous oxide during anaesthesia using the oesophageal–tracheal Combitube small adultTM

K. H. Hoerauf, T. Hartmann, S. Acimovic, A. Kopp, G. Wiesner, B. Gustorff, H. Jellinek and P. Krafft

Department of Anaesthesiology and General Intensive Care, University of Vienna, Waehringer Guertel 18–20, A-1090 Vienna, Austria*Corresponding author

Exposure to sevoflurane (SEV) and nitrous oxide during ventilation using a Combitube (37Fr) small adult (SA)TM was compared with waste gas exposure using conventional endotracheal tubes. Trace concentrations of SEV and nitrous oxide were assessed using a direct reading spectrometer during 40 gynaecological laparoscopic procedures under general anaesthesia. Measurements were made at the patients’ mouth and in the anaesthetists’ breathing zone. Mean (SD) concentrations of SEV and nitrous oxide measured at the patients’ mouth were comparable in the Combitube SATM (SEV 0.6 (0.2) p.p.m.; nitrous oxide 9.7 (8.5) p.p.m.) and endotracheal tube group (SEV 1.2 (0.8) p.p.m.; nitrous oxide 17.2 (10.6) p.p.m.). These values caused comparable contamination of the anaesthetists’ breathing zone (SEV 0.6 (0.2) p.p.m. and nitrous oxide 4.3 (3.7) p.p.m. for the Combitube SATM group, compared with SEV 0.5 (0.2) p.p.m. and nitrous oxide 4.1 (1.8) p.p.m. for the endotracheal tube group). We conclude that the use of the Combitube SATM during positive pressure ventilation is not necessarily associated with increased waste gas exposure, especially when air conditioning and scavenging devices are available.

Br J Anaesth 2001; 86: 124–6


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