PMID: 8945049Nov 1, 1996Paper

Present day pacemakers for pulse generator exchange: is 3.5 V a sufficient nominal setting for the pulse amplitude? Thera Pacemaker Study Group

Pacing and Clinical Electrophysiology : PACE
A SchuchertT Meinertz

Abstract

Projected pacemaker longevity is calculated according to the nominal setting, which is 3.5 V for pulse amplitude in most present day pacemakers. The aim of this study was to test whether the nominal ventricular output setting of 3.5 V and 0.4 ms provides a 100% safety margin if these pacemakers are connected to implanted ventricular pacing leads. The study included 24 patients undergoing pulse generator exchange. The new pacemaker was either a Thera DR (n = 21) or Thera SR (n = 3) device. Ventricular pacing leads were implanted 70 +/- 38 months previously. Intraoperative measurements included pacing threshold at 0.5-ms pulse duration, impedance, and R wave amplitude. To achieve a 100% safety margin with 3.5 V, the cut-off pacing threshold is 1.7 V. At discharge it was assessed whether ventricular pulse amplitude remained at < or = 3.5 V or was programmed to > 3.5 V. At pulse generator exchange, pacing threshold was 1.2 +/- 0.5 V, including four patients with pacing thresholds > 1.7 V. Impedance was 587 +/- 189 omega and R wave amplitude was 12.8 +/- 4.8 mV. At discharge, ventricular pulse amplitude remained at the nominal setting in 13 patients, including 2 patients with high pacing thresholds at pacemaker exchange, and was pro...Continue Reading

References

Oct 30, 1969·Annals of the New York Academy of Sciences·T A Preston, R D Judge
Jan 1, 1994·Pacing and Clinical Electrophysiology : PACE·A Schuchert, K H Kuck
Jun 1, 1993·Pacing and Clinical Electrophysiology : PACE·A G Del BufaloL Kappenberger
Apr 28, 1995·Deutsche medizinische Wochenschrift·A SchuchertT Meinertz
Feb 1, 1996·Pacing and Clinical Electrophysiology : PACE·R FogelM White
Jan 1, 1996·Pacing and Clinical Electrophysiology : PACE·S CazeauJ Mugica

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