Usefulness of Prolonged PR Interval to Predict Atrial Tachyarrhythmia Development Following Surgical Repair of Tetralogy of Fallot

Published:September 17, 2022DOI:
      Atrial tachyarrhythmias (ATAs), which may occur after tetralogy of Fallot (TOF) surgery, can cause sudden cardiac death. However, ATAs may also develop in response to electrical substrates. This study aims to examine the predictive factors for ATAs by identifying electrical substrates in the atrium obtained from 12-lead electrocardiogram in patients who underwent TOF repair. A total of 144 patients aged >15 years (median, 31.6 years) who underwent TOF repair at Hokkaido University were enrolled. We investigated the correlation between the development of ATAs with age, time interval after initial corrective surgery, brain natriuretic peptide levels, cardiac magnetic resonance parameters (right ventricular end-diastolic volume index, right ventricular end-systolic volume index, right ventricular ejection fraction, right atrial volume index, left ventricular end-diastolic volume index, left ventricular ejection fraction), and 12-lead electrocardiogram parameters (P wave maximum voltage, PR interval, QRS width, number of fragmented QRS). Of the 144 patients, 44 patients (30.6%) developed ATAs. Multivariate analysis revealed time interval after initial corrective surgery (odds ratio 6.7, 95% confidence interval 1.78 to 12.6) and PR interval (odds ratio 2.7, 95% confidence interval: 1.17 to 4.20) as independent risk factors for the development of ATAs. The receiver operating characteristic curve revealed a PR interval cut-off value of >200 milliseconds as predictive of the development of ATAs in patients more than 15 years after initial corrective surgery (area under the curve, 0.658; sensitivity, 71.4%; specificity, 66.4%). The present study demonstrated that a prolonged PR interval is a simple and convenient predictor for the development of ATAs in patients who underwent TOF repair.
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