title: Physical activity measured with implanted devices predicts patient outcome in chronic heart failure.
abstract: BACKGROUND
  Physical activity (PA) predicts cardiovascular mortality in the population at large. Less is known about its prognostic value in patients with chronic heart failure (HF).
  
  
  RESULTS
  Data from 836 patients with implantable cardioverter defibrillator without or with cardiac resynchronization therapy enrolled in the Sensitivity of the InSync Sentry OptiVol feature for the prediction of Heart Failure (SENSE-HF)(1) study and the Diagnostic Outcome Trial in Heart Failure (DOT-HF) were pooled. The devices continuously measured and stored total daily active time (single-axis accelerometer). Early PA (average daily activity over the earliest 30-day study period) was studied as a predictor of time to death or HF-related hospital admission (primary end point). Data from 781 patients were analyzed (65±10 years; 85% men; left ventricular ejection fraction, 26±7%). Older age, shorter height, ischemic cause, peripheral artery disease, atrial fibrillation, diabetes mellitus, rales, peripheral edema, higher New York Heart Association class, lower diastolic blood pressure, and no angiotensin II receptor blocker/angiotensin-converting enzyme inhibitor use were associated with reduced early PA. The primary end point occurred in 135 patients (15±7 months of follow-up). In multivariable analysis including baseline variables, early PA predicted death or HF hospitalization, with a 4% reduction in risk for each 10 minutes per day additional activity (hazard ratio [HR], 0.96; confidence interval [CI], 0.94-0.98; P=0.0002 compared with a model with the same baseline variables but without PA). PA also predicted death (HR, 0.93; CI, 0.90-0.96; P<0.0001) and HF hospitalization (HR, 0.97; CI, 0.95-0.99; P=0.011).
  
  
  CONCLUSIONS
  Early PA, averaged over a 30-day window early after defibrillator implantation or cardiac resynchronization therapy in patients with chronic HF, predicted death or HF hospitalization, as well as mortality and HF hospitalization separately, accounting for baseline HF severity. Clinical Trial Registration Information- URL: http://www.clinicaltrials.gov. Unique identifiers: NCT00400985, NCT00480077.
authors: Department of Cardiology, Antwerp University Hospital, Edegem, Belgium.
authors: Viviane M
authors: VM
authors: Conraads
authors: Martijn A
authors: MA
authors: Spruit
authors: Frieder
authors: F
authors: Braunschweig
authors: Martin R
authors: MR
authors: Cowie
authors: Luigi
authors: L
authors: Tavazzi
authors: Martin
authors: M
authors: Borggrefe
authors: Michael R S
authors: MR
authors: Hill
authors: Sandra
authors: S
authors: Jacobs
authors: Bart
authors: B
authors: Gerritse
authors: Dirk J
authors: DJ
authors: van Veldhuisen
mesh_terms: D000368:Aged; D017147:Defibrillators, Implantable; D005260:Female; D005500:Follow-Up Studies; D014943:Global Health; D006333:Heart Failure / Q000401:mortality / Q000503:physiopathology* / Q000628:therapy; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D011379:Prognosis; D012189:Retrospective Studies; D013318:Stroke Volume; D015996:Survival Rate; D013997:Time Factors; D016277:Ventricular Function, Left / Q000502:physiology*
keywords: heart failure; mortality; physical activity