Publication Date:
2016-03-22
Description:
Aims We hypothesized that P-wave amplitude in lead I is related to left atrial (LA) remodelling and inter-atrial conduction pattern, and has a predictive value for recurrence after radiofrequency catheter ablation (RFCA) among patients with paroxysmal atrial fibrillation (PAF). Methods and results A total of 525 consecutive patients with PAF (76% male, 56 ± 12 years old) who underwent RFCA were included. We compared pre-procedural sinus rhythm electrocardiograms without antiarrhythmic drug effect with LA volume (CT), LA voltage (NavX), the earliest activation site (EAS) conduction pattern of LA, and clinical recurrence rate. P-wave amplitude in lead I was significantly lower in patients with recurrence than in those that remained in sinus rhythm ( P 〈 0.001) during 21 ± 10-month follow-up. P-wave amplitude in lead I was linearly correlated with LA voltage ( β = 2.52, 95% CI 0.606–4.425, P = 0.010), LA conduction velocity ( β = 1.91, 95% CI 0.941–2.876, P 〈 0.001), and low septal displacement of EAS ( β = –1.67, 95% CI –2.352 to –0.996, P 〈 0.001). P-wave amplitudes 〈0.1 mV in lead I were independently associated with clinical recurrence of AF on multivariate Cox regression analysis (adjusted HR 2.163, 95% CI 1.307–3.581, P = 0.003). The integrated area under the curves was 0.705 (95% CI 0.655–0.755). Conclusion Low P-wave amplitude (〈0.1 mV) in lead I is related to LA remodelling and displaced inter-atrial conduction pattern to low septum, and independently predicts clinical recurrence after RFCA in patients with PAF.
Print ISSN:
1099-5129
Electronic ISSN:
1532-2092
Topics:
Medicine
