Distinct trajectories of fatigue in chronic heart failure and their association with prognosis

Abstract

Aims To identify distinct trajectories of fatigue over a 12-month period and to examine their impact on mortality in chronic heart failure (CHF).Methods and resultsConsecutive CHF patients (n = 310) were assessed at baseline and at 2-and 12-month follow-up for symptoms of exertion and general fatigue. Latent growth mixture modelling was used to examine the course of fatigue over time. The endpoint was mortality following the 12-month assessment of fatigue. Over the initial 12-month follow-up, six distinct trajectories for exertion fatigue and four distinct trajectories for general fatigue were identified. Beyond the 12-month follow-up (mean follow-up period, 693 days), 50 patients (17) had died. After controlling for standard risk factors and disease severity, both severe exertion fatigue [hazards ratio (HR) = 2.59, 95 confidence interval (CI): 1.09-6.16, P = 0.03] and severe general fatigue (HR = 3.20, 95 CI: 1.62-6.31, P = 0.001) trajectories predicted an increased mortality rate (29 vs. 19 and 28 vs. 14, respectively). The low exertion fatigue trajectory was associated with a decreased mortality risk (3 vs. 19, HR = 0.12, 95 CI: 0.02-0.93, P = 0.04).ConclusionFatigue trajectories varied across CHF patients and had a differential effect on mortality. Persistent severe fatigue was a predictor of poor prognosis. These results may help identify distinct groups of CHF patients with potentially differential risks of adverse health outcomes. © 2010 The Author.