Amir Jadidi et al. JACEP 2018;4:531-543 Arrhythmia Freedom Following Pulmonary Vein Isolation for Persistent Atrial Fibrillation Stratified According to P-Wave Duration Kaplan-Meier curves are demonstrating the percentage of patients free from arrhythmia following pulmonary vein isolation for persistent atrial fibrillation at 1-year follow-up. The green curve indicates patients with P-wave duration <150 ms, and the red curve demonstrates patients with P-wave duration ≥150 ms. Amir Jadidi et al. JACEP 2018;4:531-543 2018 The Authors