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Korean J Crit Care Med > Volume 20(2); 2005 > Article
Korean Journal of Critical Care Medicine 2005;20(2): 131-135.
원저 : 호기말 호기관 폐쇄법(End-Expiratory Port Occlusion Method)과 포획 가스 용적(Trapped Lung Volume)을 이용하여 측정한 자가호기말양압(Auto-PEEP)의 비교
손장원, 임채만, 고윤석
한양대학교 의과대학 내과학교실, 울산대학교 의과대학 서울아산병원 호흡기내과
Comparison of Auto-PEEP Levels Measured by End-expiratory Port Occlusion Method and Trapped Lung Volume
Jang Won Sohn, Chae Man Lim, Younsuck Koh
1Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
2Division of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. yskoh@amc.seoul.kr
BACKGROUND: There are several METHODS: for auto-PEEP measurement during mechanical ventilation. The end-expiratory port occlusion (EEPO) method is simple and easy. Theoretically, auto- PEEP level can be also calculated by using trapped lung volume and static compliance. However, the relationship between measured auto-PEEP by EEPO method and the calculated auto-PEEP has not been studied. The purpose of this study is to observe the relationship between the measured and the calculated auto-PEEP. METHODS: 15 patients with auto-PEEP during mechanical ventilation were included. Auto-PEEP was measured by EEPO method, and calculated by using a formula; trapped lung volume/static compliance. All of the patients were paralyzed during the study. If the measured auto-PEEP is higher than calculated auto-PEEP, this patient was included in `high group'; in the opposite case, `low group'. We compared respiratory mechanics between these two groups. RESULTS: Measured auto-PEEP was 9.60+/-2.82 cmH2O, and calculated auto-PEEP was 9.78+/-2.90 cmH2O. There was statistically significant relationship between measured and calculated auto-PEEP (r=0.81, p<0.01). There was no difference on respiratory mechanics between `high group' and `low group'. CONCLUSIONS: The auto-PEEP obtained by calculation with trapped lung volume and static compliance showed a good correlation with that of using EEPO method in the paralyzed patients.
Key Words: Static auto-PEEP; Compliance; Trapped lung volume
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