Andras Bikov 1 , 2 , Peter Lange 3 , 4 , Julie A Anderson 5 , Robert D Brook 6 , Peter M A Calverley 7 , Bartolome R Celli 8 , Nicholas J Cowans 9 , Courtney Crim 10 , Ian J Dixon 9 , Fernando J Martinez 11 , David E Newby 12 , Julie C Yates 10 , Jørgen Vestbo 1 , 2
20 May 2020
Chronic obstructive pulmonary disease (COPD) is one of the leading causes of death worldwide. Impaired lung function is associated with heightened risk for death, cardiovascular events, and COPD exacerbations. However, it is unclear if forced expiratory volume in one second (FEV 1) and forced vital capacity (FVC) differ in predictive value.
Data from 16,485 participants in the Study to Understand Mortality and Morbidity (SUMMIT) in COPD were analyzed. Patients were grouped into quintiles for each lung function parameter (FEV 1 %predicted, FVC %predicted, FEV 1/FVC). The four highest quintiles (Q2–Q5) were compared to the lowest (Q1) to assess their relationship with all-cause mortality, cardiovascular events, and moderate-to-severe and severe exacerbations. Cox-regression was used, adjusted for age, sex, ethnicity, body-mass index, smoking status, previous exacerbations, cardiovascular disease, treatment, and modified Medical Research Council dyspnea score.
Compared to Q1 (<53.5% FEV 1 predicted), increasing FEV 1 quintiles (Q2 53.5–457.5% predicted, Q3 57.5–461.6% predicted, Q4 61.6–465.8% predicted, and Q5 ≥65.8%) were all associated with significantly decreased all-cause mortality (20% (4–34%), 28% (13–40%), 23% (7–36%), and 30% (15–42%) risk reduction, respectively). In contrast, a significant risk reduction (21% (4–35%)) was seen only between Q1 and Q5 quintiles of FVC. Neither FEV 1 nor FVC was associated with cardiovascular risk. Increased FEV 1 and FEV 1/FVC quintiles were also associated with the reduction of moderate-to-severe and severe exacerbations while, surprisingly, the highest FVC quintile was related to the heightened exacerbation risk (28% (8–52%) risk increase).