on April 3, 2006
Published online before print April 3, 2006, doi: 10.1161/01.HYP.0000217141.20163.23
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Submitted on February 12, 2006
From the Framingham Heart Study (R.D., M.J.P., T.J.W., B.N., E.J.B., D.L., M.G.L., W.B.K., R.B.D., R.S.V.), National Heart, Lung, and Blood Institute, Framingham, Mass; Massachusetts Veterans Epidemiology Research and Information Center (R.D.), VA Boston Healthcare System and the Division of Aging, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass; Division of Cardiology (T.J.W.), Massachusetts General Hospital, Harvard Medical School, Boston, Mass; National Heart, Lung, and Blood Institute (D.L.), Bethesda, Md; Department of Mathematics and Statistics (M.J.P., B.N., M.G.L., R.B.D.), Boston University, Boston, Mass; Cardiology Section (R.S.V., E.J.B.) and Department of Preventive Medicine and Epidemiology (E.J.B., D.L., M.G.L., W.B.K., R.S.V.), Boston University School of Medicine, Boston, Mass. * To whom correspondence should be addressed. E-mail: vasan{at}bu.edu.
Abstract--Prolonged electrocardiographic QRS duration is frequently observed in congestive heart failure (CHF) patients. We hypothesized that CHF risk increases with longer QRS interval in individuals free of CHF. We evaluated 1759 Framingham Study participants (mean age, 69 years; 63% women) without prior myocardial infarction or CHF who attended a routine examination. QRS duration was analyzed as a continuous (log-transformed) and a categorical variable [referent, <100 ms; incomplete bundle branch block (BBB), 100 to 119 ms; complete BBB,
Revised on February 20, 2006
Electrocardiographic QRS Duration and the Risk of Congestive Heart Failure. The Framingham Heart Study
Ravi Dhingra;
120 ms]. During follow-up (mean, 12.7 years), 324 participants (205 women) developed CHF. CHF incidence increased across the 3 baseline QRS duration categories in both sexes. Each SD increment in log-QRS duration was associated with a multivariable-adjusted 23% increase in CHF risk [95% confidence interval [CI] 8% to 38%; P<0.001]. In time- dependent models with QRS category and risk factors updated every 2 years, incomplete BBB was associated with a 1.4-fold (95% CI, 1.05 to 1.96; P=0.03) and complete BBB with a 1.7-fold (95% CI, 1.28 to 2.35; P<0.001) risk of CHF. These associations were maintained on adjustment for baseline left ventricular mass. In our community-based sample, longer electrocardiographic QRS was associated with increased CHF risk, consistent with the hypothesis that depolarization delay may increase CHF risk.
Key words: electrocardiography • epidemiology • heart failure
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