Combined Bipolar/Unipolar Radiofrequency Maze is Superior to Unipolar Maze in Concomitant Surgery

• Main Authors: Yeow-Leng Chua FRCS, Jia-Lin Soon FRCS(CTh), Nakao Masakazu MRCS, See-Lim Lim FRCS
• Format: Article
• Language: English
• Published: SAGE Publishing 2011-12-01
• Series: Proceedings of Singapore Healthcare
• Online Access: https://doi.org/10.1177/201010581102000402

Introduction: Atrial fibrillation is the most common arrhythmia with significant morbidity and mortality. Radiofrequency (RF) ablation, despite its shortcomings, remain an acceptable and ‘simple’ technique. Methods: We reviewed 137 consecutive concomitant irrigated RF modified maze procedures, and compared the outcomes of 65 patients undergoing Unipolar-RF versus 72 patients using the combined Uni/Bipolar-RF approach. All patients were prospectively followed clinically, with serial electrocardiography and selective echocardiography. One hundred and twenty-two patients (89.1%) underwent mitral valve procedures, and eight coronary bypass, and seven adult congenital operations were performed. Results: The predominantly male (54.7%) patients had a mean age of 58.3±11.5 years (23–88 years). At median follow-up of 3.21 years (0.01–6.06 years), 15 (10.9%) patients were lost to follow-up. Freedom from AF in the Uni/Bipolar-RF group was higher at six months: 85.1% (57/67) versus 65% (39/60) in the Unipolar-RF group (P=0.012). This superior trend persisted at five years: 100% (5/5) in the Uni/Bipolar-RF group versus 79.5% (31/39) in the Unipolar-RF group, although this is not statistically significantly (P=0.566). Patients with left atrial dilatation beyond 7.6cm were more likely to remain in AF (OR 0.44, 95% CI, 0.19–1.00, P=0.049). Perioperative mortality was 2.9%. There was no collateral damage by the device and procedure. The mean survival for patients AF-free at last follow-up is 5.73 years (95% CI, 5.48–5.98), comparable to 5.58 years (95% CI, 5.07–6.10) in those remaining in AF. Thirty (22.6%) patients were completely off anti-arrhythmic medication while 36 (25.6%) were anticoagulant-free. Conclusion: The combined Uni/bipolar-RF modified bi-atrial Maze technique is simple, safe and superior to isolated Unipolar-RF ablation. Midterm results continue to support its use although long-term durability remains to be elucidated.