반폐쇄식 회로를 이용한 폐쇄회로 마취시 신선가스 유량이 호흡일에 미치는 영향 = Effect of Fresh Gas Flow on the Work of Breathing of Closed Circuit Anesthesia using Semiclosed Circuit System.

다국어 초록 (Multilingual Abstract)

Backgound: We can maintain closed circuit anesthesia using semi-closed circuit system. The effect of anesthetic techniques, such as closed-circuit anesthesia (CCA) using semiclosed circuit system and semi-closed circuit anesthesia (SCCA), on the work of breathing has not been studied yet in detail. This study was purposed to compare the work of breathing according to anesthetic technique (CCA, SCCA).
Methods: Thirty patients scheduled for elective orthopedic surgery were enrolled for study and randomly assigned to receive either SCCA group (n = 15) or CCA group (n = 15). Anesthesia was induced with propofol 2 mg/kg with 2% lidocaine 1 ml, fentanyl 100 μg and rocuronium 0.6 mg/kg. Two percents isoflurane with O2 2 L/min and N2O 2 L/min were given for 10 min to patients initially to wash in the functional residual capacity of both lungs and the breathing circuits. In SCCA group, anesthesia was maintained with 2% isoflurane in O2 2 L/min and N2O 2 L/min flow throughout the surgery and in CCA group, O2 was reduced to 200 ml/min and N2O to 100 mL/min with isoflurane vaporizer setting adjusted to 4% for anesthesia maintenance. When the operation was ended, the vaporizer set of isoflurane deceased to zero and then O2 was increased to 4 L/min for the arousal of the patient. We measured the inspiratory/expiratory concentration of isoflurane, endtidal CO2, the hemodynamic parameters, the change of airway pressure, the work of breathing and compliance at anesthetic induction and emergence in both groups.
Results: There were no significant differences in the inspiratory/expiratory concentrations of isoflurane, the hemodynamic parameters and endtidal CO2 between both groups. There were no significant differences in airway pressure, the work of breathing and compliance.
Conclusions: CCA using semiclosed circuit system does not increase the work of breathing compared to SCCA.
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Key words: closed circuit anesthesia, isoflurane, semi-closed circuit anesthesia, work of breathing.

목차 (Table of Contents)

• 목 차
• Abstract
• Ⅰ. 서 론
• Ⅱ. 대상 및 방법
• Ⅲ. 결 과
• Ⅳ. 고 찰
• Ⅴ. 참고문헌
• 표 및 그림