[Reproduction of tachycardias in patients with WPW syndrome]

Intracavitary electrophysiological study of the heart (IES) was carried out in 27 patients with WPW syndrome. In 17/27, permanent tachycardia, reentry type was reproduced, in 1/27--unstable and in 2/27--echo phenomenon, in 1/27--atrial fibrillation. In 6/27 no tachycardia was reproduced. In I patient the tachycardia, type reentry "detained" in atrial flutter, and in 2--in ventricular tachycardia (unstable). In all patients IES established the presence of additional connections between auricles and ventricles: to left auricle--9 patients (5 obscure connections out of them), to right auricle--6 patients, to septum--10 patients, James connection--1 and connection of Mahaim--1 patient. IES is a valuable method for reproduction of tachycardia in the existence of anatomic base (additional connection) and proper electrophysiological characteristics (short refractory phases). In parallel with tachycardia, reentry type, atrial and ventricular tachycardia could develop in the patients with WPW, making use of the additional connection. IES contributes to the elucidation of numerous diagnostic and therapeutic problems in the patients with WPW.