Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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The Isoflurane Concentration of Precision Vaporizer Goldman Vaporizer According to Room Temperature and Carrier Gas Flow Rate

온도 및 유량에 따른 흡입 마취제 전용 기화기와 Goldman 기화기의 isoflurane 농도 변화

  • 김성미 (건국대학교 수의과대학 수의외과학교실) ;
  • 장화석 (건국대학교 수의과대학 수의외과학교실) ;
  • 이정선 (건국대학교 수의과대학 수의외과학교실) ;
  • 최치봉 (건국대학교 수의과대학 수의외과학교실) ;
  • 임희란 (건국대학교 수의과대학 수의외과학교실) ;
  • 최준철 (건국대학교 수의과대학 수의외과학교실) ;
  • 김휘율 (건국대학교 수의과대학 수의외과학교실)
  • Published : 2004.09.01
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Abstract

Anesthetic machines may be equipped with either a precision or nonprecision vaporizer. A precision vaporizer is designed to deliver an exact concentration of anesthetic agent. Goldman vaporizer is a low-flow, closed-circle circuit with a low resistance vaporizer, in circuit. Vaporizers used within circle system(VIC) are not usually temperature compensated and this is generally thought to be a disadvantage. As the volatile agent is vaporized, heat is extracted from the liquid and temperature decreases. This cooling of the liquid leads to a decrease in concentration of the anaesthetic agent delivered by the vaporizer. The purpose of this study is to examine the mechanical consistency of the delivery of isoflurane from Goldman vaporizer and precision vaporizer at various gas flow rates and temperatures. And we first studied isoflurane concentration according to room temperature changes delivered by a Goldman vaporizer and precision vaporizer using different gas flow. The room temperature of $15^{\circ}C,$ $20^{\circ}C,$ $28^{\circ}C$ and fresh gas flow rates of 0.5, 1.0, 1.5, 2.0, 3.0 l/min were used. The inspired agent concentration was measured using a Datex-Ohmeda multigas analyzer. As rose in room temperature, the isoflurane concentration of precision vaporizer approximated the dial setting. On the other hand, at a dial setting concentration of 5.0 percent the delivered isoflurane concentration of precision vaporizer was more than the dial setting in high temperature. The isoflurane concentration of precision vaporizer remained constant despite the increase in temperature. The isoflurane concentration of Goldman vaporizer was increased with rise in room temperature and decreased with rise in gas flow.

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References

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