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• W2726856831 abstract "Background Although abnormalities of the QT interval are associated with atrial fibrillation ( AF ), it is unclear whether ventricular depolarization ( QRS duration) or repolarization ( JT interval) is a more important marker of AF risk. Methods This analysis included 4,181 (95% white; 59% women) participants from the Cardiovascular Health Study ( CHS ) who were free of baseline AF and major intraventricular delay. A linear scale was used to compute heart rate adjusted QT ( QT a), QRS ( QRS a ), and JT ( JT a ) intervals. Prolonged QT a , QRS a , and JT a were defined by values greater than the sex‐specific 95th percentile for each measurement. AF events were ascertained during the annual study electrocardiograms and from hospitalization discharge data. Cox regression was used to compute hazard ratios ( HR ) and 95% confidence intervals ( CI ) for the associations of prolonged QT a , QRS a , and JT a with AF , separately. Results Over a mean follow‐up of 12.1 years, a total of 1,236 (30%) AF events were detected. An increased risk of AF ( HR = 1.50. 95% CI = 1.20, 1.88) was observed with prolonged QT a . When we examined the association between individual components of the QT a interval and AF , the risk of AF was limited to prolonged JT a ( HR = 1.31, 95% CI = 1.04, 1.65) and not prolonged QRS a ( HR = 1.00, 95% CI = 0.77, 1.30). Similar results were obtained per 1‐ SD increase in QT a ( HR = 1.07, 95% CI = 1.01, 1.13), QRS a ( HR = 0.99, 95% CI = 0.94, 1.06), and JT a ( HR = 1.07, 95% CI = 1.01, 1.13). Conclusions The JT interval is a more important marker of AF risk in the QT interval among persons who do not have ventricular conduction delays." @default.
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• W2726856831 date "2017-06-29" @default.
• W2726856831 modified "2023-09-26" @default.
• W2726856831 title "The association of QT interval components with atrial fibrillation" @default.
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• W2726856831 doi "https://doi.org/10.1111/anec.12467" @default.
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