Background: Pulmonary-vein isolation (PVI) is currently used for the treatment of chronic and paroxysmal atrial fibrillation and a major risk of PVI is thromboembolism. The purpose of this study was to observe embolic event rate in patients with persistent or paroxysmal atrial fibrillation (AF) undergone PVI.
Methods: Circumferential PVI (CPVI) was performed in 64 consecutive patients with persistent AF (42 men, aged (60.0 +/- 9.1) years) and in 84 consecutive patients with paroxysmal AF (53 men, aged (61.4 +/- 9.3) years). Warfarin was administrated in all patients before ablation for at least 3 weeks ((5.2 +/- 2.6) weeks) and continued for at least 3 months post ablation with international normalized ratio (INR) of 2.0 - 3.0. During CPVI, intravenous heparin was given at a dose of 5000 - 8000 U or 75 - 100 U/kg, followed by 1000 U or 12 U/kg per hour.
Results: In patients with persistent AF, 1 patient developed embolic event during ablation and 3 patients developed embolic events after ablation. In contrast, no thromboembolic event was observed in patients with paroxysmal AF (4/64 vs 0/84, P = 0. 033).
Conclusion: Thromboembolic event rate related to CPVI is significantly higher in patients with persistent AF than that in patients with paroxysmal AF.
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