[A new balloon electrode for intraoperative endocardial mapping].

To enhance the utility of epicardial mapping in the intraoperative determination of the location of the arrhythmic source, we developed a new balloon electrode covered with Presnet-tubular dressing material including 46 snap electrode recording sites. The bipolar recording sites, 1.0 mm in diameter and spaced at intervals of 1.5 mm, are constructed of gold and directly attached steel wire. This new balloon electrode was effective intraoperative determination of the lesion in 2 patients one with Wolff-Parkinson-White syndrome and the other with ventricular tachycardia.