[Surgical atrioventricular disconnection in Wolff-Parkinson-White syndrome].

Surgical atrioventricular disconnection is a possible means of treating patients with severe paroxysmal arrhythmias resistant to medical treatment due to the Wolff-Parkinson-White syndrome. Between 1971 and April 1982 we operated 50 patients (38 men and 12 women) with the WPW syndrome. Thirty seven patients were operated for arrhythmias (paroxysmal tachycardia) resistant to medical therapy or with a high risk of sudden death. Thirteen patients had associated cardiac disease with less severe arrhythmias (aortic valve disease: 6 cases; mitral and aortic valve disease: 3 cases; mitral valve disease: 3 cases, and atrial septal defect: 1 case). The causes of paroxysmal tachycardia were atrial fibrillation (13 cases), atrial flutter (2 cases), orthodromic reciprocating tachycardia (30 cases), with associated atrial fibrillation in 9 cases, and with associated atrial flutter in 4 cases. Antidromic reciprocating tachycardia was present in 2 cases. In 3 cases, the preexcitation was a chance finding. Electrophysiological studies performed before and after antiarrhythmic drug administration showed type A WPW (LV preexcitation) in 23 cases, and type B WPW (RV preexcitation) in 20 cases. The ECG was normal in the horizontal plane in 7 cases. The atrioventricular accessory pathway was permeable in both directions in 39 cases; in 9 cases the pathway was permeable only in the retrograde direction and in 2 cases it was permeable only in the anterograde direction. In 7 patients an atrio-hisian short circuit was demonstrated. The site of the accessory conduction pathway was located by epicardial mapping, the first surgical stage, in the left lateral region of the atrioventricular junction (28 cases), in the right lateral region (6 cases), in the posterior septal region (15 cases) (right sided in 4 cases, left sided in 11 cases), and in the anterior septal region (1 case). The accessory pathway (so-called Bundle of Kent) was interrupted by atrioventricular disconnection. Six patients died during surgery, mainly at the beginning of the series; the operative risk is now low (1 death in the last 34 cases: 2,95%). Complete interruption of the accessory pathway was obtained in 38 cases, 1 of which had to be reoperated. Three patients had an incomplete result due to partial interruption or the presence of a second accessory pathway. However, these patients no longer have severe arrhythmias. Surgical section failed in 3 cases, but the patients are now controlled by medical therapy.(ABSTRACT TRUNCATED AT 400 WORDS)