[The clinical relevance of intraoperative electrophysiologic mapping (author's transl)].

Electrophysiological intraoperative mapping is described as a technique for identification of the specialized AV conduction system during open heart surgery; furthermore it is suitable for delineating the morphological origin of ventricular tachycardias which requre surgical therapy. The mapping technique is described with respect to its methodical aspects and illustrated by means of congenital and acquired heart disease.