A prolonged PR interval (≥202 ms) was a significant predictor of atrial fibrillation recurrence after radiofrequency catheter ablation (HR 1.969; 95% CI 1.343 to 2.886; P=0.001).
Cohort (n=576)
Does a prolonged PR interval predict clinical recurrence of atrial fibrillation after radiofrequency catheter ablation in patients with AF?
A prolonged PR interval (≥202 ms) is associated with advanced left atrial remodeling and serves as a significant noninvasive predictor of AF recurrence after radiofrequency catheter ablation.
Effect estimate: HR 1.969 (95% CI 1.343 to 2.886)
p-value: p=0.001
BACKGROUND: A prolonged PR interval is known to be a poor prognostic factor in cardiovascular disease. The aim of this study was to investigate the association between PR interval and clinical outcome in patients undergoing radiofrequency catheter ablation (RFCA) of atrial fibrillation (AF). METHODS AND RESULTS: We prospectively included 576 patients with AF (75.5% male, 57.8±11.6 years old, 68.8% paroxysmal AF) who underwent RFCA. We analyzed preprocedural sinus rhythm ECGs obtained in the absence of antiarrhythmic drug, and all enrolled patients were categorized into 4 groups based on the quartile values of the PR interval (166, 182, and 202 ms), and were analyzed according to the left atrium (LA) volume (CT; Computed tomography), LA voltage (NavX), and clinical outcome of AF ablation. Based on quartile value of PR interval, the highest quartile of PR interval (Q4; PR ≥202 ms) was oldest (P<0.001), and most likely to have persistent AF (P<0.001) and hypertension (P=0.013) compared with the other groups. However, there was no significant difference in LA conduction velocity and atrial effective refractory period. Q4 had the greatest LA dimension (P<0.001) and volume index (P<0.001), and lowest LA appendage-emptying velocity (P<0.032) and LA voltage (P<0.001) compared with the others. For 13.1±7.5 months, the classification based on the PR interval was a significant predictor of AF recurrence after RFCA of AF (HR=1.969, 95% CI 1.343 to 2.886, P=0.001). CONCLUSIONS: The PR interval was closely associated with advanced LA remodeling due to AF, and had a noninvasive significant predictive value of clinical recurrence of AF after RFCA.
Park et al. (Tue,) conducted a cohort in Atrial fibrillation (n=576). Prolonged PR interval (≥202 ms) vs. Shorter PR intervals (<202 ms) was evaluated on Clinical recurrence of AF after RFCA (HR 1.969, 95% CI 1.343 to 2.886, p=0.001). A prolonged PR interval (≥202 ms) was a significant predictor of atrial fibrillation recurrence after radiofrequency catheter ablation (HR 1.969; 95% CI 1.343 to 2.886; P=0.001).