[Comparison of body surface maps with epicardial maps in patients with Wolff-Parkinson-White syndrome].

To investigate the ventricular activation process reflected on body surface maps, we compared body surface isopotential and isochrone maps with epicardial isochrone maps in 39 patients with Wolff-Parkinson-White syndrome. The epicardial earliest activation site, the latest activation site and the distribution of isochrone line during mid QRS period were reflected well on the location of minimum during early QRS period, the location of maximum during terminal QRS period, and the movement of base line during mid QRS period on isopotential maps respectively. Right ventricular breakthrough via normal conduction pathway was recognized on epicardial maps in most patients with left sided or septal accessory pathway, though some patients had it on isopotential maps and a few patients had it on isochrone maps. The unique distribution of initial minimum in patients with posteroseptal pathway was caused by the ventricular fusion of the preexcitation at diaphragmatic base and the normal activation at right ventricular free wall.