Background: Few studies have investigated the association between temporal change in QT interval and incident heart failure (HF). The aim of this study is to examine this association in the Atherosclerosis Risk in Communities (ARIC) study.
Methods and results: A secondary analysis was performed for the ARIC study. Overall, 10,274 participants (age 60.0±5.7 years, 45.7% male and 19.5% black) who obtained a 12-lead electrocardiography (ECG) at both Visit 1 (1987-1989) and Visit 3 (1993-1995) in the ARIC study were included. QT interval duration was corrected by using Bazett's formula (QTc). The change in corrected QT interval duration (∆QTc) was calculated by subtracting QTc at Visit 3 from Visit 1. The main outcome measure was incident HF. Multivariable Cox regression models were used to assess the association between ∆QTc and incident HF. During a median follow up of 19.5 years, 1,833 cases (17.8%) of incident HF occurred. ∆QTc was positively associated with incident HF (HR: 1.06, 95% CI 1.03, 1.08, per 10 ms increase, P<0.001; HR 1.22, 95% CI 1.08, 1.36, T3 vs. T1, P=0.002), after adjusting for traditional cardiovascular risk factor, QTc and QRS duration.
Conclusions: Temporal increases in QTc are independently associated with increased risk of HF.
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