[Dissection of the accessory conduction pathways with simultaneous mitral valve surgery].

The case of surgical treatment of a 44-years old female with a double atrio-ventricular accessory pathway and mitral stenosis was described. Fast ventricular rates due to conduction through the accessory pathways during atrial fibrillation in course of mitral stenosis caused severe heart failure, occasionally with deep hypotonia. Combined treatment with prajmaline and propafenone blocked conduction through accessory pathways. The ventricular rate slowed from approx. 200/min to 150/min. Addition of digoxin slowed the ventricular rate down to approx 80-100/min. There were no signs of preexcitation. Treatment with diuretics and vasodilators was continued. The state of patient improved. Echocardiographic and hemodynamic evaluation revealed: mitral stenosis (orifice - 75 mm2) with moderate regurgitation, small aortic and tricuspid regurgitation. The coronary arteries were normal. On the base of the ECG recordings during atrial fibrillation both accessory pathways were localized on lateral and posterior parts of the left free wall. The patient was operated on. Both atrio-ventricular by-pass tracts were dissected using Sealy's method in Cox modification and then mitral valve prosthesis Medtronic-Hall 27 mm was implanted. Prajmaline and propafenone were discontinued and preexcitation did not recovered. The sinus rhythm was restored by electroversion. The patient had no overt heart failure on discharge from the Institute.