Relationship of the static deflation volume and pressure in a patient with idiopathic pulmonary fibrosis

The lung volume (as a percent of predicted TLC) is plotted against the static transpulmonary pressure (cmH2O) for a patient with ILD. In general, the compliance, maximum static transpulmonary pressure, and the coefficient of retraction (the maximum transpulmonary pressure to TLC) tend to correlate with the extent of parenchymal lung involvement observed on lung biopsy.