Figure 2From: The lungs need to be deflated: effects of glycopyrronium on lung hyperinflation in COPD patientsPressure-volume curve of the respiratory system. EELV, end-expiratory lung volume: (1) in healthy subjects, (2) in subjects with lung hyperinflation; PEEPi, intrinsic end-expiratory positive pressure; VT, tidal volume.Back to article page