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Association between quartiles of coupling interval heterogeneity and incident CHF over time. Kaplan-Meier curves adjusted for age, gender, race, body mass index, history of diabetes, hypertension, myocardial infarction, smoking, use of Vaughan-Williams class Ia, Ib, Ic, II and IV antiarrhythmics, PVC frequency, PVC duration and coupling interval duration. CHF, congestive heart failure; PVC, premature ventricular complex.
