Modified Senning procedures for simple transposition of the great arteries.

From December 1990 to July 1994, 10 infants with simple transposition of the great arteries (TGA) underwent the Senning procedure at National Cheng Kung University Medical College. Their ages ranged from 1 to 8 months (mean, 4.8 +/- 2 months), and their body weight ranged from 3.5 to 7.5 kg (mean, 5.7 +/- 1.2 kg). Four infants were treated with the conventional method by covering the sinoatrial (SA) node with the anterior right atrial flap (group 1). The other six patients had modified procedures, having the suture line across the caval vein, caudal to the SA node (group 2). Three of the group 1 patients experienced junctional rhythm temporarily, another had SA node dysfunction for 1 week postoperatively. In group 2, all patients were in sinus rhythm except one, who returned to sinus rhythm on the second postoperative day. There was one (10%) surgical mortality, a patient in group 1, and one (10%) late mortality, in group 2. The clinical follow-up interval was 6 to 46 months (mean, 28.8 mo). All survivors were in sinus rhythm, and echocardiographic studies demonstrated no difference between the two groups as to conduit obstruction or degree of tricuspid valve regurgitation. In conclusion, in situations that require atrial switch for the correction of TGA, a suture line across the caval vein, caudal to the SA node, may be a useful modification to prevent arrhythmias.