03017nas a2200493 4500008004100000022001400041245006200055210005700117260001300174300001100187490000700198520168900205653000901894653002401903653001901927653002401946653001101970653001101981653001401992653002102006653000902027653001602036653001702052100002102069700002402090700001902114700002302133700002302156700002202179700002402201700002402225700002502249700001802274700002602292700001902318700001802337700002002355700002202375700002202397700002502419700002002444700002302464856003602487 2013 eng d a1556-387100aThe QT interval and risk of incident atrial fibrillation.0 aQT interval and risk of incident atrial fibrillation c2013 Oct a1562-80 v103 a
BACKGROUND: Abnormal atrial repolarization is important in the development of atrial fibrillation (AF), but no direct measurement is available in clinical medicine.
OBJECTIVE: To determine whether the QT interval, a marker of ventricular repolarization, could be used to predict incident AF.
METHODS: We examined a prolonged QT interval corrected by using the Framingham formula (QT(Fram)) as a predictor of incident AF in the Atherosclerosis Risk in Communities (ARIC) study. The Cardiovascular Health Study (CHS) and Health, Aging, and Body Composition (ABC) study were used for validation. Secondary predictors included QT duration as a continuous variable, a short QT interval, and QT intervals corrected by using other formulas.
RESULTS: Among 14,538 ARIC study participants, a prolonged QT(Fram) predicted a roughly 2-fold increased risk of AF (hazard ratio [HR] 2.05; 95% confidence interval [CI] 1.42-2.96; P < .001). No substantive attenuation was observed after adjustment for age, race, sex, study center, body mass index, hypertension, diabetes, coronary disease, and heart failure. The findings were validated in Cardiovascular Health Study and Health, Aging, and Body Composition study and were similar across various QT correction methods. Also in the ARIC study, each 10-ms increase in QT(Fram) was associated with an increased unadjusted (HR 1.14; 95% CI 1.10-1.17; P < .001) and adjusted (HR 1.11; 95% CI 1.07-1.14; P < .001) risk of AF. Findings regarding a short QT interval were inconsistent across cohorts.
CONCLUSIONS: A prolonged QT interval is associated with an increased risk of incident AF.
10aAged10aAtrial Fibrillation10aCohort Studies10aElectrocardiography10aFemale10aHumans10aIncidence10aLong QT Syndrome10aMale10aMiddle Aged10aRisk Factors1 aMandyam, Mala, C1 aSoliman, Elsayed, Z1 aAlonso, Alvaro1 aDewland, Thomas, A1 aHeckbert, Susan, R1 aVittinghoff, Eric1 aCummings, Steven, R1 aEllinor, Patrick, T1 aChaitman, Bernard, R1 aStocke, Karen1 aApplegate, William, B1 aArking, Dan, E1 aButler, Javed1 aLoehr, Laura, R1 aMagnani, Jared, W1 aMurphy, Rachel, A1 aSatterfield, Suzanne1 aNewman, Anne, B1 aMarcus, Gregory, M uhttps://chs-nhlbi.org/node/5998