| A Clinical Study on the Actual Inhaled Concentration of Halothane Output from Fluotec Mark III Vaporizer. |
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Soon Im Kim |
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Department of Anesthesiology, Soon Chung Hyang College, School of Medicine, Seoul, Korea. |
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| Abstract |
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The accurate control of the concentration of anesthetic gas is most important for ideal induction, maintenance and recovery in general inhalation anesthesia. So vaporizers for the control of the concentration of anesthetic gas were investigated for many years, and the Fluotec series for halothane was also designed. When using the Fluotec Mark lll, which is known to be one of the most accurate halothane vaporizer, it will be clinicaly significant to confirm the relationships of the actual concentration of halothane output and the dial setting in the change of carrier gas flow rate, so studied as follows. At Soon Chun Hyang University Hospital, general inhalation anesthesia was used on three groups of 20 patients each. Halothane was delivered respectively at a dial setting concentration of 1% to group l, 2% to group ll and 3% to group lll. The halothane concentration was measured with the Engstom EMMA gas analyser in 50% oxygen(O2) and nitrous oixde(N2O) gas mixture, as the carrier gas flow was changed from 2l to 4l, to 6l per minute. The results were as follows: 1) The actual inhaled concentration of halothane increased in proportion ot the increase of carrier gas flow rate in all three groups. 2) At a dial setting concentration of 1 percent the delivered actual concentration of halothane approximated the dial setting, on the other hand, at a dial setting concentration of 2 percent and 3 percent the delivered actual concentreation of halothane was less that the dial setting. |
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