DIAGNOSTIC-SIGNIFICANCE OF CHANGES OF THE PACEMAKER SPIKE POTENTIAL IN PATIENTS WITH MONOPOLAR CARDIAC STIMULATION (ACCORDING TO THE DATA OF ECG DIGITAL ANALYZER)

Pacemaker pulse potentials in standard ECG leads were analyzed by a di gital ECG analyzer (PM-20M, Biotronik) in 226 patients with monopolar ventricular stimulation. During the first days after operation in 189 patients with uncomplicated postoperative course the value of relative pulse potential was 251+/-43 mV. This value was decreased down to 231 +/-33 mV by the end of the first month (p<0.05) and remained on this l evel during a period up to 7 years. In cases of electrode microdiscloc ation (12 patients and endocardial electrode dislocation (10 patients) the relative pulse potential value increased and reached 295+/-73 mV and 296+/-53 mV, respectively. In cases with high stimulation threshol ds considerable decrease of relative pulse potential (from 260+/-73 mV to 60+/-41 mV) was noted. In 5 patients hormone therapy resulted in r apid reversion of the relative pulse potential to the initial value.