[P-synchronized ventricular stimulation in supraventricular tachycardia].

The author used P-synchronized stimulation of the ventricles to prevent tachycardia paroxysms in patients with frequent drug-resistant paroxysms of supraventricular tachycardia (SVT). Electrophysiologic examinations revealed additional conductive pathways functioning during tachycardia in the retrograde direction in 12 patients whereas in 6 cases tachycardia was accounted for by the mechanism of the re-entry of the excitation wave inside the atrioventricular node. The detected mechanisms of SVT development made it possible to use a method of its prevention by ventricular electrostimulation in the P-synchronized mode. Stimulation parameters were determined by a specially devised technique during electrophysiological examination. Following this stimulation, tachycardia attacks were completely prevented and attempts to provoke them by various types of stimulation were unsuccessful.