Is Gas Density Independent of the Maximum Expiratory Flows at Low Lung Volumes?
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概要
- 論文の詳細を見る
MEFV and MIFV curves of six volunteer subjects were recorded while they were breathing He-O_2, air and SF_6-O_2, respectively, at 0.5, 1.0 or 2.0 ATA. MEFVs at lung volumes greater than 25% of vital capacity had a close relation with the density of inspired gas, and varied as an exponential function of density. The exponents were between -0.35 and -0.45 according to lung volumes. Correlation coefficients of gas density to peak flow, V_50 and V_25 were -0.987, -0.986 and -0.976, respectively. Even at a very low lung volume (V_10) the coefficient was -0.734. Statistical analysis of V_10 revealed that the correlation coefficient of V_10 with viscosity or with kinematic viscosity is almost identical to that with density and has a magnitude of -0.73. MEFV at very low lung volumes or flows in the peripheral airways is very unlikely to be laminar.
- 東海大学の論文
- 1979-07-00
著者
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Yamauchi Toshitada
Department Of Internal Medicine Ii School Of Medicine Tokai University
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Yamauchi Toshitada
Department Of Internal Medicine School Of Medicine Tokai University
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Ohta Yasuyo
Department Of Medicine Tokai University School Of Medicine
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YAMAZAKI Yohnosuke
Department of Anesthesiology, School of Medicine, Tokai University
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- Is Gas Density Independent of the Maximum Expiratory Flows at Low Lung Volumes?