Evaluation of injury current amplitude in elderly patients undergoing right ventricular pacing

Objectives: Investigate the current of injury (COI) during right ventricular lead implantation at the old patients. Methods and Results: 123 patients (pts) were implanted 2 chambers pacemaker were divided to 2 Groups. Group I included 84 pts with age < 70 years and Group II included 39 pts with age ≥ 70 years. All pts was measured the pacemaker parameters of right ventricular lead, right atrial lead and COI during lead implantation. There is not significantly different between 2 groups in the pacemaker parameter of right ventricular implantation: at sensing amplitudes (Group I were 11,18±1,92 mV vs Group II were 10,8±2 mV; p=NS); at lead impedances (Group I were 637,6±73,51 ᾨ vs Group were II 634,09±62,21 ᾨ; p=NS) and at pacing thresholds (Group I were 0,67±0,17 V vs Group II were 0,69±0,22 V; p=NS). Similar, there is not significantly different between 2 groups in the pacemaker parameter of left ventricular implantation: at sensing amplitudes (Group I were 3,23 ± 1,56 mV vs Group II were 3,15 ± 1,38 mV; p=NS); at lead impedances (Group I were 586,31 ± 125, 82 ᾨ vs Group were II 565,21 ± 137, 62 ᾨ; p=NS) and at pacing thresholds (Group I were 0,79 ± 0,14 V vs Group II were 0,76 ± 0,21 V; p=NS). Group II gets the lower of COI amplitude at right ventricular lead versus Group I (Group II were 10,81±2,31 mV vs Group I were 14,06 ± 4,13 mV; p=0,03) but no different of COI amplitude at right atrial lead between 2 Groups (Group II were 2,91 ± 0,48 mV vs Group I were 3,02 ± 0, 32 mV; p=NS) Conclusion: The patients with age ≥ 70 years get lower of COI amplitude than the patients with age < 70 years.