This paper analyzes mediastinal and pericardial stress--strain in COPD
patients and the author suggests that the mediastinum deformation of
COPD patients should not be neglected. It leads to the stress growth in
it; the stress is accumulated around and effects on the pericardium. Ac-
cording to the pericardium's balance equation proposed by the author, the
stress increase can result in the decrease of pericardium curvature and medi-
a...