[First experiences with the effect of low-energy electric impulse on the atrioventricular junction in various types of paroxysmal supraventricular tachycardia]. / Pervyi opyt nizkoénergeticheskogo élektroimpu'lsnogo vozdeistviia na atrioventrikuliarnoe soedinenie serdtsa pri nekotorykh paroksizma'lnykh nadzheludochkovykh takhikardiiakh.

Efficient treatment of paroxysmal supraventricular reciprocal tachycardias (nodal and orthodromal) was studied in 29 patients by applying low-energy discharges (mean 2.3 +/- 0.1 kV) to the area of the atrioventricular junction. Late results of the treatment were assessed 7-22 months later. Cessation of tachycardia paroxysms was observed in 10 patients, their lower frequency (by more than 50%) was seen in 14 cases. The value of discharge energy, their numbers, relations between potential amplitudes produced by atria and His' bundle, feasibility of paroxysm induction, presence or absence of bundle-branch block were not prognostic criteria for efficiency of this mode of therapy in the present investigation. In the authors' opinion, the method is promising in the treatment of atrioventricular nodal and orthodromal paroxysmal tachycardias.

[Clinical use and late results of transvenous endocardial destruction of the atrioventricular junction by the bipolar method]. / Klinicheskii opyt i otdalennye rezul'taty transvenoznoi éndokardial'noi destruktsii atrioventrikuliarnogo soedineniia serdtsa bipoliarnym sposobom.

Transvenous endocardial destruction of the AV junction, using an original bipolar technique, was carried out in 32 patients with supraventricular tachyarrhythmias, resistant to medication. The procedure was effective in 29 (91%) of 32 patients. Stable and complete AV block was achieved in 23 of 30 patients, with subsequent implantation of a pacemaker, while in 4 patients, clinical improvement was achieved with intact AV conductivity. Two patients with re-entry tachycardia of the AV junction were subjected to low-energy contusion of the AV junction, and the results were good. Major hemodynamic and myocardial contractility parameters were basically unchanged at long-term follow-up; spontaneous heart rate was significantly decreased in patients with implanted pacemakers, and some of those developed pacemaker dependence.