Change of inspired oxygen concentration in low flow anesthesia

Kim Jiwook; Kang Donghee; Lee Hochul; Ryu Sungwon; Ryu Siejeong; Kim Doosik

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자료유형: 학술저널

저자정보: Kim Jiwook (Kosin University College of Medicine) Kang Donghee (Kosin University College of Medicine) Lee Hochul (Kosin University College of Medicine) Ryu Sungwon (Kosin University College of Medicine) Ryu Siejeong (Kosin University College of Medicine) Kim Doosik (Kosin University College of Medicine)

저널정보: 대한마취통증의학회(구 대한마취과학회) Anesthesia and Pain Medicine Anesthesia and Pain Medicine Vol.15 No.4

발행연도: 2020.1

수록면: 434 - 440 (7page)

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Background: There are several advantages of low flow anesthesia including safety, economics, and eco-friendliness. However, oxygen concentration of fresh gas flow and inspired gas are large different in low flow anesthesia. This is a hurdle to access to low flow anesthesia. In this study, we aimed to investigate the change in inhaled oxygen concentration in low flow anesthesia using oxygen and medical air.Methods: A total of 60 patients scheduled for elective surgery with an American Society of Anesthesiologist physical status I or II were enrolled and randomly allocated into two groups. Group H: Fresh gas flow rate (FGF) 4 L/min (FiO₂ 0.5). Group L: FGF 1 L/min (FiO₂ 0.5). FGF was applied 4 L/min in initial phase (10 min) after intubation. After initial phase FGF was adjusted according to groups. FGF continued at the end of surgery. Oxygen and inhalation anesthetic gas concentration were recorded for 180 min at 15 min interval.Results: The inspired oxygen concentration decreased by 5.5% during the first 15 min in the group L. Inspired oxygen decreased by 1.5% during next 15 min. Inspired oxygen decreased by 1.4% for 30 to 60 min. The inspired oxygen of group L is 35.4 ± 4.0% in 180 min. The group H had little difference in inspired oxygen concentration over time and decreased by 1.8% for 180 min.Conclusions: The inspired oxygen concentration is maintained at 30% or more for 180 min in patients under 90 kg. Despite some technical difficulties, low flow anesthesia may be considered.

#Balanced anesthesia #General anesthesia #Inspired oxygen #Low flow.

참고문헌 (19)

참고문헌 신청

Foldes FF / 1952 / The administration of nitrous oxide-oxygen anesthesia in closed systems / Ann Surg 136:978~981

Virtue RW / 1974 / Minimal-flow nitrous oxide anesthesia / Anesthesiology 40:196~198

Geoffrey N / 2008 / Low-flow anaesthesia / Contin Educ Anaesth Crit Care Pain 8:1~4

Hargasser S / 1995 / A lower solubility recommends the use of desflurane more than isoflurane, halothane, and enflurane under low-flow conditions / J Clin Anesth 7:49~53

Baum J / 2001 / Low flow anaesthesia: the theory and practice of low flow, minimal flow and closed system anaesthesia / Butterworth-Heinemann :195~234

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Kim Jiwook

소속기관 Department of Anesthesiology and Pain Medicine Kosin University Gospel Hospital

주요연구분야 의약학 > 임상의학 > 마취과학

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Kang Donghee