Fig. 1
From: The clinical relevance of the emphysema-hyperinflated phenotype in COPD
Change in end-expiratory lung volume (EELV) with COPD. EELV is set at the point at which the elastic recoil pressures of the lung and chest wall are equal and opposite in direction. In COPD patients with hyperinflation, emphysema decreases lung elastic recoil pressure and causes a reset of functional residual capacity, or EELV, at a higher absolute lung volume. The difference between expected (long-dashed lines) and observed EELV (short-dashed lines) represent static hyperinflation