Abstract
Purpose: The aim of this study was to investigate the mechanical effects of chest wall compression on regional chest wall motion during quiet breathing in healthy male subjects.
Methods: Seven healthy male subjects were participated. Total and regional chest wall motion was measured by optoelectronic plethysmography in the supine position during quiet breathing with upper rib cage compression and lower rib cage compression. We also simultaneously studied pleural and abdominal pressures.
Results: Upper rib cage volume was increased during upper rib cage compression, and lower rib cage volume was increased during lower rib cage compression. Upper rib cage volume was, however, decreased during lower rib cage compression. Pleural and abdominal pressures were increased during chest wall compression as compared to during quiet breathing, particularly in the case of abdominal pressure during lower rib cage compression.
Conclusion: We concluded that chest wall compression increases regional chest wall volume of the compressed chest. However, lower rib cage compression decreases upper rib cage volume by increasing abdominal pressure.
