Five-Repetition Sit-to-Stand Test as Predictor of Mortality in High Risk COPD Patients

Abstract

ObjectiveTo determine if adding performance on the five-repetition sit-to-stand test (5-STS) to chronic obstructive pulmonary disease (COPD) high-risk criteria, proposed by the Spanish COPD guidelines (GesEPOC), affects mortality prognosis. MethodsObservational study of COPD outpatients involved prospective follow-up for 5 years. Patients were classified based on 5-STS performance and risk criteria proposed by GesEPOC version 2021. Outcome measures were 5-year mortality timing and rate. Kaplan–Meier curves and univariate and multivariate Cox proportional-hazard analyses, analysis of variance, and univariate and multivariate linear and logistic regression models were used. ResultsOne hundred and thirty-seven patients were included. Mean age was 66±8.3 years, and 87.6% were men. Of them, 115 (83.9%) were classified as high risk, 43 (34.4%) of whom had poor performance on the 5-STS. Overall mortality at 5 years was 27% and was significantly higher in the high-risk (29.6%) compared with the low-risk (13.6%) group. Among high-risk patients, mortality at 5 years was significantly worse with poor 5-STS performance (60.5%) compared with non-poor performance (11.1%). Poor performance on the 5-STS was independently associated with increased 5-year mortality risk (HR 4.70; 95% CI: 1.96–11.27) in a model adjusted for history of heart disease and dyspnea. ConclusionAmong high-risk COPD patients, those with poor performance on the 5-STS have a significantly higher mortality at 5 years than those with non-poor 5-STS performance.