PMID: 8945028Nov 1, 1996Paper

Evaluation of autosensing as an automatic means of maintaining a 2:1 sensing safety margin in an implanted pacemaker. Autosensing Investigation Team

Pacing and Clinical Electrophysiology : PACE
A CastroJ C Allen

Abstract

As intracardiac signal amplitudes fluctuate due to patient activity, drug intake, and other factors, it is imperative that an adequate sensing safety margin in an implanted pacemaker be used to compensate. We studied an investigational autosensing feature that automatically adjusts the device's sensitivity. Data were collected from 55 patients, with Intermedics model 292-03 or 294-03 pacemakers, upon inclusion of the study (Visit 1); 1 month postinclusion (Visit 2); 1 month, 1 day postinclusion (Visit 3); then 1 month, 2 days postinclusion (Visit 4). Atrial (N = 45) and/or ventricular (N = 54) thresholds were assessed at each visit; during Visit 2, myopotential tests were performed at two sensitivity settings. Autosensing was activated following Visit 1, then programmed on randomly at Visit 2 or Visit 3. From Visit 2-Visit 4, patients were monitored during daily activities (D), exercise (E), and sleep (S) with 24-hour Holter. With Autosensing on, atrial undersensing episodes were D = 33 (P > 0.2), and S = 28 (p < 0.05); ventricular undersensing episodes were D = 6 (p > 0.5). Ventricular oversensing episodes were S = 2; atrial oversensing episodes were S = 34 (p > 0.5), D = 2, and E = 3. Comparing Autosensing adjusted sensitivit...Continue Reading

References

Nov 1, 1992·Pacing and Clinical Electrophysiology : PACE·M BergH Schieffer
Oct 1, 1990·Pacing and Clinical Electrophysiology : PACE·J H WilsonE H Wettenstein
Dec 1, 1990·Pacing and Clinical Electrophysiology : PACE·A H ShandlingM Nolasco
Dec 1, 1991·Pacing and Clinical Electrophysiology : PACE·B A RossP C Gillette
Nov 1, 1985·Pacing and Clinical Electrophysiology : PACE·M RosenqvistO Edhag

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Citations

Nov 21, 2000·The American Journal of Cardiology·J NeuznerJ Sperzel
Nov 21, 2000·The American Journal of Cardiology·J Warren
Feb 22, 2001·International Journal of Cardiology·M RomanòA Grieco
Mar 23, 2002·Forensic Science International : Synergy·Mirko JungeKlaus Püschel
Mar 25, 1999·The American Journal of Cardiology·B R JonesJ A Warren
Nov 24, 1998·Pacing and Clinical Electrophysiology : PACE·B NowakJ Meyer
Feb 17, 1999·Pacing and Clinical Electrophysiology : PACE·C T LamG Ayers
Jan 21, 2000·Pacing and Clinical Electrophysiology : PACE·T V GlotzerJ M Zimmerman

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