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Right arrow Electrophysiology - arrhythmias

Eur J Cardiothorac Surg 2001;19:443-447
© 2001 Elsevier Science NL

The radiofrequency modified maze procedure. A less invasive surgical approach to atrial fibrillation during open-heart surgery

Hauw T. Siea, Willem P. Beukemaa, Anand R. Ramdat Misiera, Arif Elvana, Jacob J. Ennemaa, Hein J.J. Wellensb

a Department of Cardiothoracic Surgery and Department of Cardiology and Cardioanesthesiology, Ziekenhuis De Weezenlanden, Groot Wezenland 20, 8011 JW Zwolle, The Netherlands
b Academic Hospital Maastricht, Maastricht, The Netherlands

Received 12 October 2000; received in revised form 11 January 2001; accepted 13 January 2001.

Corresponding author. Tel.: +31-38-424-2866; fax: +31-38-424-3163
e-mail: hauwsie{at}worldonline.nl

Objective: Patients with mitral valve disease and suffering of atrial fibrillation of more than 1 year's duration have a low probability of remaining in sinus rhythm after valve surgery alone. Intraoperative radiofrequency ablation was used as an alternative to simplify the surgical maze procedure. Methods: Seventy-two patients with mitral valve disease, aged 63±11 years ranging from 31 to 80 years, underwent valve surgery and radiofrequency energy applied endocardially, based on the maze III procedure to eliminate the arrhythmia. The right-sided maze was performed on the beating heart and the left-sided maze during aorta cross-clamping. Results: Surgical procedures included mitral valve repair (n=38) or replacement (n=34) and in addition tricuspid valve repair (n=42), closure of an atrial septal defect (n=2) and correction of cor triatriatum (n=1). The left-sided maze needed 14±3 min extra ischemic time. There were two in-hospital deaths (2.7%) and three patients (4.2%) died during follow-up of 20±15 months. Among 67 surviving patients, 51 patients (76%) were in sinus rhythm, two patients (3%) had an atrial rhythm and eight patients (12%) had persistent atrial fibrillation or atrial flutter. Four patients had a pacemaker implanted, in one patient because of sinus node dysfunction. Doppler echocardiography in 64 patients demonstrated right atrial contractility in 89% and left atrial transport in 91% of patients. Conclusions: Intraoperative radiofrequency ablation of atrial fibrillation is an effective and less invasive alternative for the original maze procedure to eliminate atrial fibrillation.

Key Words: Atrial fibrillation • Mitral valve disease • Radiofrequency




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