[Atrioventricular conduction by a bundle of Kent discovered after a surgical A.V.B].

The case is reported of an 8 year old child who had a 1/1 atrio-ventricular conduction by the bundle of Kent after accidental surgical division of the bundle of His; this "accessory" pathway conducted satisfactorily over a period of 12 years. At the age of 20, the patient had a complete conduction block of the bundle of Kent, causing a complete atrio-ventricular block; this indicated the definitive insertion of a pacemaker.