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Korean J Crit Care Med > Volume 19(2); 2004 > Article
Korean Journal of Critical Care Medicine 2004;19(2): 126-129.
원저 : 폐쇄순환 마취 시 후두마스크와 기관내관에 의한 환기비교
신일우, 박경언, 정희동, 손주태, 이헌근, 정영균
경상대학교 의과대학 마취통증의학교실 및 *건강과학연구원
Comparison of Ventilations with LMA and Endotracheal Tube during Closed Circuit Anesthesia
Il Woo Shin, Kyeong Eon Park, Hee Dong Chung, Ju Tae Sohn, Heon Keun Lee, Young Kyun Chung
1Department of Anesthesiology and Pain Medicine, College of Medicine, Gyeongsang National University, Jinju, Korea. ykchung@nongae.gsnu.ac.kr
2Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju, Korea.
ABSTRACT
BACKGROUND: LMA has larger dead-space than tracheal tube, ventilation may be influenced by difference of dead space. Closed circuit mechanical ventilation has high risk of hypercarbia because of inadequate CO2 elimination or gas supply. Thus, end-tidal carbon dioxide tension (EtCO2) and arterial carbon dioxide tension (PaCO2) were compared during closed circuit mechanical ventilation with LMA or tracheal tube. METHODS: Thirty adult patients scheduled for general anesthesia were divided into 2 groups. After induction of general anesthesia, laryngeal mask airway (Group 1, n=15) or tracheal tube (Group 2, n=15) were randomly inserted and closed circuit mechanical ventilation was initiated. When steady state had been reached, PaCO2 and EtCO2 were recorded. RESULTS: The PaCO2 was 32.2+/-2.8 (Group 1), 31.5+/-2.2 (Group 2) and the EtCO2 was 33.0+/-2.9, 31.6+/-2.4 respectively and there was no statistical significance between groups. The difference of arterial and end-tidal carbon dioxide tension in each group was -0.8+/-2.6, -0.03+/-2.2 respectively and there was no statistical significance between groups. CONCLUSIONS: The results indicate that in patients who are mechanically ventilated via the closed circuit system, EtCO2, PaCO2, and the difference between arterial and end-tidal carbon dioxide tension were not significantly different between groups.
Key Words: Carbon dioxide tension; Closed circuit anesthesia; Laryngeal mask airway; Tracheal tube
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