Published online before print June 23, 2008, doi: 10.1161/HYPERTENSIONAHA.108.113191
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
(Hypertension. 2008;52:229.)
© 2008 American Heart Association, Inc.
Original Articles |
Prognostic Value of Ambulatory Heart Rate Revisited in 6928 Subjects From 6 Populations
From the Research Center for Prevention and Health and Department of Clinical Physiology, Faculty of Health Sciences (T.W.H.), Hvidovre University Hospital, Copenhagen, Denmark; Studies Coordinating Centre (L.T., J.A.S.), Division of Hypertension and Cardiovascular Rehabilitation, Department of Cardiovascular Diseases, University of Leuven, Leuven, Belgium; Departamento de Fisiopatología (J.B.), Hospital de Clínicas, Universidad de la República, Montevideo, Uruguay; Center for Epidemiological Studies and Clinical Trials (Y.L., J.W.), Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Tohoku University Graduate School of Pharmaceutical Science and Medicine (M.K., T.O., Y.I.), Sendai, Japan; Section of Geriatrics (K.B.-B., L.L.), Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden; Department of Epidemiology (T.R., J.A.S.), Maastricht University, Maastricht, The Netherlands; Asociación Española Primera de Socorros Mutuos (E.S.), Montevideo, Uruguay; Copenhagen University Hospital (J.J., C.T.-P.), Copenhagen, Denmark; Aarhus University and Division of Cardiology (H.I.), Holbak Hospital, Holbak, Denmark; and Conway Institute of Biomolecular and Biomedical Research (E.O.), University College Dublin, Dublin, Ireland.
Correspondence to Jan A. Staessen, Studies Coordinating Centre, Laboratory of Hypertension, University of Leuven, Campus Gasthuisberg, Herestraat 49, Box 702, B-3000 Leuven, Belgium. E-mail jan.staessen{at}med.kuleuven.be
The evidence relating mortality and morbidity to heart rate remains inconsistent. We performed 24-hour ambulatory blood pressure monitoring in 6928 subjects (not on β-blockers; mean age: 56.2 years; 46.5% women) enrolled in prospective population studies in Denmark, Belgium, Japan, Sweden, Uruguay, and China. We computed standardized hazard ratios for heart rate, while stratifying for cohort, and adjusting for blood pressure and other cardiovascular risk factors. Over 9.6 years (median), 850, 325, and 493 deaths accrued for total, cardiovascular, and noncardiovascular mortality, respectively. The incidence of fatal combined with nonfatal end points was 805, 363, 439, and 324 for cardiovascular, stroke, cardiac, and coronary events, respectively. Twenty-four-hour heart rate predicted total (hazard ratio: 1.15) and noncardiovascular (hazard ratio: 1.18) mortality but not cardiovascular mortality (hazard ratio: 1.11) or any of the fatal combined with nonfatal events (hazard ratio: 
1.02). Daytime heart rate did not predict mortality (hazard ratio: 1.11) or any fatal combined with nonfatal event (hazard ratio: 0.96). Nighttime heart rate predicted all of the mortality outcomes (hazard ratio: 
1.15) but none of the fatal combined with nonfatal events (hazard ratio: 1.11). The night:day heart rate ratio predicted total (hazard ratio: 1.14) and noncardiovascular mortality (hazard ratio: 1.12) and all of the fatal combined with nonfatal events (hazard ratio: 1.15) with the exception of stroke (hazard ratio: 1.06). Sensitivity analyses, in which we stratified by risk factors or from which we excluded 1 cohort at a time or the events occurring within 2 years of enrollment, showed consistent results. In the general population, heart rate predicts total and noncardiovascular mortality. With the exception of the night:day heart rate ratio, heart rate did not add to the risk stratification for fatal combined with nonfatal cardiovascular events. Thus, heart rate adds little to the prediction of cardiovascular risk.
Key Words: heart rate • mortality • cardiovascular disease • risk factors • epidemiology