[Therapeutic electrical procedures in recurring, drug refractory tachycardias. I. Antitachycardiac implantable pacemaker systems].

In 9 Patients with medicamentously therapy-refractory tachycardias (twice paroxysmal AV-node-reentry tachycardia, four times paroxysmal orthrodromic reentry tachycardia in the WPW-syndrome, once paroxysmal atrial reentry tachycardia, twice recurrent ventricular tachycardia) after adequate electrophysiological testings antitachycardiac pacemakers able to activate the patients were implanted. In these cases the implantable tachyblocker TUR-RFP-01 was used in 4 cases for the highly frequent volley atrial stimulation, in 2 cases for the more highly frequent volley ventricular stimulation. In 3 patients the interruption of the tachycardia was performed by ventricular underdrive stimulation by means of putting the magnet on a conventional R-wave-inhibited ventricular pacemaker. In all cases the recurrent tachycardias could reliably be terminated by the patients themselves by activation of the antitachycardiac systems (duration of the follow-up period 3-14 months, on an average 10.7 +/- 3.4 months); only in one case in the further course a change of the stimulation parameters was necessary which were carefully tested at the beginning. On account of the danger of the acceleration of the tachycardia and of the evocation of ventricular fibrillation, respectively, should, however, be performed highly frequent ventricular stimulations for the termination of ventricular tachycardias only in readiness for defibrillation.