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Effects of lung volume levels and Trapidil on transdiaphragmatic pressure in young healthy subjects Ryouichi Ohta 1 , Keiji Takahashi 1 , Hideki Ikeda 1 , Shinobu Sato 1 , Shoji Yasui 1 1First Department of Internal Medicine, Yamagata University School of Medicine Keyword: 横隔膜収縮圧(transdiaphragmatic pressure) , トラピジール(Trapidil) , 肺気量位(lungvolume level) pp.237-242
Published Date 1990/3/15
DOI https://doi.org/10.11477/mf.1404900110
  • Abstract
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Effects of lung volume levels, and effect of intra-venous administration of Trapidil on the maximal force developed by the diaphragm were investigated by the measurement of transdiaphragmatic pressure (Pdi) in 10 healthy young subjects. To evaluate transdiaphragmatic pressure, ΔPdimax was used. ΔPdimax was calculated by the subtraction of the transdiaphragmatic pressure at FRC (Pdi FRC) from the maximal transdiaphragmatic pressure (Pdimax) at each lung-volume level.

Regardless of the administration of Trapidil, ΔPdimax was highest at FRC in each subject. When Trapidil was administered, Pdimax increased in cases where absolute Pdimax FRC was initially low, The relation between changes of ΔPdimax at FRC after Trapidil administration and ΔPdimax showed signifi-cant linear correlation (r=-0.85, p<0.002).

These results suggest that FRC is the most ade-quate lung volume level to produce an effective trans-diaphragmatic pressure, and that Trapidil increases the muscle force of the diaphragm in cases where the force is initially low in young healthy subjects.


Copyright © 1990, 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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