Pollution of Ambient Air by Volatile Anesthetics: A Comparison of Four Anesthetic Management Techniques
UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD
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Chronic exposure to waste anesthetic gas WAG may lead to health problems. The purpose of this study was to compare WAG concentrations resulting from four combinations of FGF and vaporizer settings during a simulated intravenous induction where the anesthetic is deepened using a volatile anesthetic delivered via mask ventilation prior to intubation. Using lung model, WAG was sampled three times each using four different combinations and three volatile anesthetics 3 sevoflurane, 2 isoflurane, and 6 desflurane. The combinations were FGF offvaporizer on, FGF onvaporizer off, leaving both on and turning both off. WAG was measured using a MIRAN Ambient Air Analyzer placed at a level approximating the anesthetists head. One-way analysis of variance with a Student-Newman-Keuls post hoc test was used to compare the concentration of WAG among the combinations of FGFvaporizer settings and among the agents for a given combination. Regardless of the agent, only the FGF onvaporizer on combination resulted in a statistically greater WAG level p0.005. The results support using three of the four combinations examined when mask ventilation with a volatile agent accompanies an intravenous induction. Future studies should examine other methods of controlling WAG levels and use time-weighted averages to help address clinical significance.
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