Cryoballoon in AF ablation: Impact of PV ovality on AF recurrence ☆

Abstract Introduction Complete occlusion of the pulmonary veins (PV) is crucial for successful PV isolation. While two different sizes of cryoballoons (23 and 28mm) are available, complete occlusion is not always achieved in any given PV. We investigated the role of PV ostial anatomy during cryoballoon PV occlusion grading and atrial fibrillation (AF) recurrence rate. Methods PV ostial diameter was analyzed in 168 consecutive patients (111 men, 61±10years, 124 paroxysmal (px) and 44 persistent AF) using cardiac computed tomography (CT) prior to procedure. The ovality index at the PV ostial level was calculated in any given PV. During follow-up, 7-day holter monitors were performed at 1, 3, 6, 9, 12, 18 and 24months post-ablation. Results The success rate at 12±6months follow-up was 69% including a 3-month blanking period (px AF: 66%; persistent AF 77%). The ovality index of the left-sided PVs was significantly larger ("more oval") than that of the right-sided PVs ( p p =0.004). Patients with AF recurrence had "more oval" left-sided PVs compared to patients free from AF recurrence (LSPV 0.40±0.2 vs. 0.33±0.2; p =0.04 and LIPV 0.41±0.3 vs. 0.32±0.2; p =0.03), whereas no significant association was found for right sided PVs. Conclusion The ostial PV anatomy seems to have an important impact on clinical outcome and should be considered when planning and performing cryoballoon AF ablation procedures.