Variables measured during cardiopulmonary exercise testing as predictors of mortality in chronic systolic heart failure

HF-ACTION Investigators

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

Background Data from a cardiopulmonary exercise (CPX) test are used to determine prognosis in patients with chronic heart failure (HF). However, few published studies have simultaneously compared the relative prognostic strength of multiple CPX variables. Objectives The study sought to describe the strength of the association among variables measured during a CPX test and all-cause mortality in patients with HF with reduced ejection fraction (HFrEF), including the influence of sex and patient effort, as measured by respiratory exchange ratio (RER). Methods Among patients (n = 2,100, 29% women) enrolled in the HF-ACTION (HF-A Controlled Trial Investigating Outcomes of exercise traiNing) trial, 10 CPX test variables measured at baseline (e.g., peak oxygen uptake [Vo2], exercise duration, percent predicted peak Vo2 [%ppVo2], ventilatory efficiency) were examined. Results Over a median follow-up of 32 months, there were 357 deaths. All CPX variables, except RER, were related to all-cause mortality (all p < 0.0001). Both %ppVo2 and exercise duration were equally able to predict (Wald chi-square: ∼141) and discriminate (c-index: 0.69) mortality. Peak Vo2 (ml·kg-1·min-1) was the strongest predictor of mortality among men (Wald chi-square: 129) and exercise duration among women (Wald chi-square: 41). Multivariable analyses showed that %ppVo2, exercise duration, and peak Vo2 (ml·kg-1·min-1) were similarly able to predict and discriminate mortality. In men, a 10% 1-year mortality rate corresponded to a peak Vo2 of 10.9 ml·kg-1·min-1 versus 5.3 ml·kg-1·min-1 in women. Conclusions Peak Vo2, exercise duration, and % ppVo2 carried the strongest ability to predict and discriminate the likelihood of death in patients with HFrEF. The prognosis associated with a given peak Vo2 differed by sex.

Original languageEnglish (US)
Pages (from-to)780-789
Number of pages10
JournalJournal of the American College of Cardiology
Volume67
Issue number7
DOIs
StatePublished - Feb 23 2016

Keywords

  • Peak Vo
  • Respiratory exchange ratio
  • Sex
  • Survival

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Fingerprint Dive into the research topics of 'Variables measured during cardiopulmonary exercise testing as predictors of mortality in chronic systolic heart failure'. Together they form a unique fingerprint.

  • Cite this