[The factors influencing the incidence of heart rhythm disorders after the radical correction of the tetralogy of Fallot].

The frequency and factors favouring the development of cardiac rhythm disorders were studied in 306 patients operated on radically for Fallot's tetralogy (follow-up: 6 months--29 years). This complication was found in 99 patients (32.3%). Most patients showed ventricular arrhythmia--62 (62.6%). Paroxysmal tachycardia was noted in 11 patients, atrio-ventricular block in 15 patients, combination of different arrhythmias in 11 patients. Risk factors were: inadequate correction of the malformation, age over 15 at the time of operation, approach through the right ventricle with plastic repair of the drainage tract, five years after surgery.