Gilroy R J, Mangura B T, Lavietes M H
Department of Medicine, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark.
Am Rev Respir Dis. 1988 Mar;137(3):668-72. doi: 10.1164/ajrccm/137.3.668.
To examine the effect of abdominal distension upon the actions of both rib cage and abdomen, we made serial determinations of tidal volume with a chest wall volume-displacement method in 8 pregnant women. Enhancement of tidal volume, long recognized in pregnancy, was achieved usually by augmentation of rib cage volume displacement. By contrast, abdominal volume displacement during quiet breathing is not altered in a predictable fashion by the gravid state. Given these findings, we hypothesize that the increased diaphragmatic contraction of pregnancy is accompanied by the transmission of that force to the lower rib cage via the area of apposition and that diaphragmatic contraction accounts for enhancement of the tidal breath. Diminished abdominal compliance might contribute to the augmentation of rib cage volume displacement as well. Konno-Mead diagrams suggest that this hypothesis is true in some, but not all, subjects.
为研究腹胀对胸廓和腹部活动的影响，我们采用胸壁容积位移法对8名孕妇的潮气量进行了连续测定。孕期潮气量增加这一现象早已为人所知，通常是通过胸廓容积位移的增加来实现的。相比之下，安静呼吸时腹部容积位移并不会因妊娠状态而以可预测的方式发生改变。基于这些发现，我们推测孕期膈肌收缩增强会通过附着区域将该力量传递至下胸廓，且膈肌收缩是潮气量增加的原因。腹部顺应性降低也可能有助于胸廓容积位移的增加。康诺-米德图表明，这一假设在部分而非所有受试者中成立。
