Fig. 4From: MRI-assessed diaphragmatic function can predict frequent acute exacerbation of COPD: a prospective observational study based on telehealth-based monitoring systemThe morphology of diaphragm and lung hyperinflation at end of maximal breathing in COPD subgroups. a.b. present mild group at the end of maximal inspiration (a) and expiration (b); c.d. present moderate group at the end of maximal inspiration (c) and expiration (d); e.f. present severe group at the end of maximal inspiration (e) and expiration (f); g.h. present very severe group at the end of maximal inspiration (g) and expiration (h). Mild group, FEV1 ≥ 80% predicted; moderate group, 50% ≤ FEV1 < 80% predicted; severe group, 30% ≤ FEV1 < 50% predicted; very severe group, FEV1 < 30% predictedBack to article page