Objective To determine whether prolongation of QTc interval predicts atrial fibrillation (AF) recurrence after catheter ablation in a cohort of patients with hypertension.Methods we retrospectively enrolled 242 hypertensive patients with AF who underwent the first time catheter ablation procedure in Beijing Anzhen hospital.Baseline data and QTc before procedure were collected.Results 98 patients had AF recurrence after a mean follow-up of 17.0± 9.4 months.Those experiencing recurrence had longer QTc than those who did not experience recurrence (419±23 ms vs 429± 26 ms, P=0.004).Multivariate Cox regression analysis demonstrated that QTc and left atrium dimension (LAD) were independent predictors for recurrence of AF.The patients with longer QTc was associated with an increased risk of AF recurrence (HR:2.361, 95% CI 1.353-4.121 ,P=0.003).QTc had an incremental value over LAD in predicting AF recurrence after catheter ablation.Conclusion QT prolongation is an independent risk factor for atrial fibrillation recurrence after catheter ablation in patients with hypertension