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Ann Thorac Surg 2002;74:S1307-S1311
© 2002 The Society of Thoracic Surgeons
a Department of Cardiothoracic Surgery, University Hospital Maastricht, Cardiovascular Research Institute Maastricht, Maastricht, The Netherlands
b Department of Cardiology, University Hospital Maastricht, Cardiovascular Research Institute Maastricht, Maastricht, The Netherlands
* Address reprint requests to Dr Maessen, CARIM, Department of Cardiothoracic Surgery, University Hospital Maastricht, P.O. Box 5800, 6202 AZ, Maastricht, The Netherlands
e-mail: jma{at}scpc.azm.nl
Presented at the Eighth Annual Cardiothoracic Techniques and Technologies Meeting 2002, Miami Beach, FL, Jan 23–26, 2002.
BACKGROUND: In this feasibility study, early results are presented of our first series of patients with microwave ablation for atrial fibrillation (AF) on the beating heart.
METHODS: From June 2001 until December 2001, a total of 24 patients underwent beating-heart epicardial ablation for AF. With a microwave antenna, the left and right pulmonary veins were isolated and connected to each other followed by amputation of the left atrial appendage. Subsequently, patients underwent either off-pump coronary artery bypass graft or valve surgery on pump. The mean age of the patients was 67.4 ± 6 years. Three patients experienced paroxysmal atrial fibrillation and all others chronic AF. Mean left atrial diameter was 5.4 ± 0.6 cm, and mean ablation time was 13 min.
RESULTS: All procedures but one were completed successfully on the beating heart. All patients were in sinus rhythm after the procedure. A total of 15 patients experienced periods with postoperative AF during hospital stay; 9 of these patients were discharged with AF. All patients received either sotalol or amiodarone. At latest follow-up (3 to 9 months), 20 of 23 patients were in sinus rhythm.
CONCLUSIONS: With microwave ablation, electrical isolation of the pulmonary veins can be achieved epicardially without cardiopulmonary bypass support.
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