Coexistent emphysema delays the decrease of vital capacity in idiopathic pulmonary fibrosis

SummaryAlthough previous authors have reported single data point, yearly changes in respiratory function have not been examined in combined pulmonary fibrosis and emphysema (CPFE). To quantify the annual changes in respiratory function of patients with CPFE and to examine the difference in survival between CPFE patients and patients with idiopathic pulmonary fibrosis without emphysema (IPF alone), 26 patients with CPFE and 33 IPF alone patients, whose respiratory function had been monitored for at least a year, were selected. The baseline of vital capacity percent predicted (VC% pred) in CPFE patients was greater than that in IPF-alone patients (86.6±24.0% vs. 72.8±19.4%, p=0.018). The annual decrease in VC% pred was significantly less in CPFE patients than in IPF-alone patients (−1.2±4.8% vs. −8.0±7.4%, p<0.001). Baseline ratio of forced expiratory volume in one second to forced vital capacity (FEV1/FVC%) in CPFE patients was lower than that in IPF-alone patients (76.6±8.5% vs. 85.2±6.7%, p