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Ann Thorac Surg 2001;72:1473-1478
© 2001 The Society of Thoracic Surgeons
a Department of Cardiovascular Surgery, Osaka National Hospital, Osaka, Japan
Accepted for publication June 13, 2001.
* Address reprint requests to Dr Isobe, Department of Cardiovascular Surgery, Osaka National Hospital, 2-1-14 Hoenzaka, Chuo-ku, Osaka, 540-0006, Japan
e-mail: isobe{at}onh.go.jp
Background. Atrial transport and atrial natriuretic peptide secretion is severely reduced from normal after the maze III procedure. To improve these factors, we developed a bilateral appendage-preserving maze procedure (BAP-maze).
Methods. Forty-six patients with chronic atrial fibrillation who underwent the BAP-maze procedure were compared with 40 patients who underwent the maze III procedure. The ratio of the peak velocity of the A and E waves of transmitral flow (transthoracic pulsed Doppler echocardiography), the left atrial appendage ejection fraction (transesophageal echocardiography), and the atrial natriuretic peptide secretory reserve during treadmill exercise test were measured at 6 months postoperatively.
Results. Sinus rhythm was restored in 44 patients (95.7%) by the BAP-maze procedure and in 39 patients (97.5%) by the maze III procedure. The ratio of the peak velocity of the A and E waves was 0.52 ± 0.22 in the BAP-maze group and 0.25 ± 0.19 in the maze III group (p < 0.0001). The left atrial appendage ejection fraction was 44.7% ± 11.5%, and the atrial natriuretic peptide secretory reserve was greater in the BAP maze group (p = 0.037).
Conclusions. The BAP-maze procedure improved atrial transport and atrial natriuretic peptide secretion as well as simplifying the maze operation, without decreasing its effectiveness against atrial fibrillation.
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