Background and Objective: Due to the high cost of scavenging systems, it is rare to find them in use in the hospitals of developing countries. This study was designed to determine the efficacy of a modified scavenging system for isoflurane for use in the Philippines Material and Methods: A modified scavenging system was constructed using a 500 ml of beaker glass with 100 ml of tap water, the opening tightly sealed with styropore. A single anesthesia machine, gas analyzer and isoflurane vaporizer were used in this study. Oxygen flow was set at one liter per minute. The isoflurane vaporizer was set at 2.5 volume percent. A corrugated tube conveys wasted gas into the beaker and allows the gas to bubble through the tap water. Another tube conveys bubbled gas from the beaker to the atmosphere. As soon as there is no change for at least 15 seconds in the numeric value and graphical representation of the MAC and volume percent of isoflurane in the gas analyzer, the reading was recorded as MAC-O minute and volume percent-0 minute. This was repeated every 15 minutes thereafter in the inlet port and every five minute in exit port until 60 minutes Results: The mean MAC and volume percent of isoflurane at point A and B were 1.1 versus 0.938461538 and 1.3 versus 1.158974359, respectively (t-test p0.05). At point B, all observation was statistically lower than the baseline (t-test p0.05) Conclusion: The MAC and volume percent of isoflurane were statistically lower at point B from 0 observation time until 60 minute observation time using the modified scavenging system. (Author)
ANESTHESIA, ISOFLURANE