[Transvenous electric ablation of an accessory pathway in supraventricular re-entry tachycardias refractory to therapy].

Transvenous catheter ablation of a concealed accessory pathway was attempted twice in an 18-year-old patient with dilatative cardiomyopathy and drug-refractory supraventricular tachycardias. The postero-septal concealed pathway was successfully ablated by the catheter technique without interruption of the normal, anterograde AV-nodal conduction. Accessory pathway conduction did not recur during 4 months of follow-up.