Radiofrequency catheter ablation of a nodoventricular Mahaim tract.

We report the case of a patient with both a left bundle branch block-preexcited tachycardia using a Mahaim bundle and a tachycardia exhibiting a left bundle branch pattern without preexcited complexes related to an AV nodal reentrant tachycardia. Successful ablation of the nodoventricular tract was obtained in the posteroseptal location in the AV node region. The pattern of Wolff-Parkinson-White (WPW) syndrome and both forms of tachycardia disappeared.