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Measurement of airway resistance during general anesthesia Takayuki Sakai 1 , Hitoshi Yoshida 1 , Hirofumi Yano 1 , Masuhiko Takaori 1 1Dept. of Anesthesiology, Kawasaki Medical School pp.1059-1064
Published Date 1987/10/15
DOI https://doi.org/10.11477/mf.1404205132
  • Abstract
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Effect of lung volume and respiratory airflow on airway resistance were studied in five patients dur-ing general anesthesia under controlled ventilation. Airway resistance which was measured during an inspiratory phase with constant airflow was de-creased in inverse correlationship to increase in lung volume. On the contrary, airway resistance which was measured by airway pressure alone during the expiratory phase was increased with exactly linear relationship (r=0.679) as expressed by a function of Y=K1+K2X, to the increase of expiratory airflow as to the lung volume. "K1" was calculated by values of airway resistance corresponded to 3-4 different airflows was mostly identical to that calculated from transpulmonary pressure and also was noted unaf-fected from an intentional resistance-loading to the expiration. Therefore,K1, measured from the method, as mentioned above, may be justified as one of better expression of airway resistance independently to either inspiratory lung volume or expiratory airflow.


Copyright © 1987, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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