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. Published on behalf of the European Society of Cardiology. All rights reserved.
Bibliographical notePublisher Copyright:
© The Author 2015.
All Science Journal Classification (ASJC) codes
- Cardiology and Cardiovascular Medicine
- Physiology (medical)