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J Appl Physiol 72: 1270-1278, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 72, Issue 4 1270-1278, Copyright © 1992 by American Physiological Society

ARTICLES

Structural change of the thorax in chronic obstructive pulmonary disease

J. M. Walsh, C. L. Webber Jr, P. J. Fahey and J. T. Sharp
Section of Pulmonary and Critical Care Medicine, Loyola University Medical Center, Maywood, Illinois.

This study examines structural changes of the thorax in hyperinflated subjects with chronic obstructive pulmonary disease (COPD). Age-matched normal subjects were used for comparison. Thoracic dimensions were determined using anteroposterior and lateral chest radiographs performed at total lung capacity, functional residual capacity, and residual volume. Rib cage dimensions (lateral diameter, rib angle, anteroposterior diameter) and diaphragm position were determined at each lung volume. There were no significant differences in rib cage dimension between the COPD and normal subjects for all lung volumes. In contrast, the diaphragm was significantly lower in the COPD subjects. The change of rib cage dimensions in the COPD subjects (for a similar volume change) was not different from that in normal subjects, whereas the change of diaphragm position in the COPD subjects (for a similar volume change) was reduced. In conclusion, the primary structural change of the thorax in COPD with chronic hyperinflation is confined to the diaphragm, with no appreciable structural change in the rib cage.


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