Document Detail

The impact of automatic threshold tracking on pulse generator longevity in patients with different chronic stimulation thresholds.
MedLine Citation:
PMID:  11139924     Owner:  NLM     Status:  MEDLINE    
Automatic adjustment of the stimulation output of pacemakers to changing stimulation thresholds using the Autocapture feature increases patient safety and decreases energy consumption. This study examined the impact of Autocapture on pulse generator longevity in patients with different chronic stimulation thresholds. Eighty patients (mean age 79 +/- 9 years; 37 men, 43 women) with Pacesetter Regency SR+ pacemakers were included in the study. Data were collected before discharge of the patients from the hospital, 6-12 weeks postimplant, and then every 6-12 months. Pulse generator longevity was calculated theoretically, assuming 100% stimulation with a stable threshold, at a pacing rate of 65 +/- 6 beats/min and 1% backup pulses. Theoretical pulse generator longevity was calculated for low (< 1 V), intermediate (> or = 1 V and < 2 V), and high (> or = 2 V) stimulation thresholds. Pulse generator longevity was compared among three groups: (A) Autocapture programmed On, (B) Autocapture programmed Off, (C) theoretical calculations using thresholds of patients in group A with the stimulation voltage programmed at twice pacing threshold, or at a minimum of 2.4 V. The mean follow-up time since implantation was 19 +/- 8 months. The calculated longevity benefits for patients in group A were 36%, 59%, and 30% compared to group B, and 19%, 32%, and 49% compared to group C in patients with low, intermediate, and high chronic stimulation thresholds, respectively. Theoretical calculations based on chronic stimulation thresholds in our patient population with Regency SR+ pacemakers suggest that Autocapture may markedly prolong pulse generator longevity in patients with a broad range of long-term pacing thresholds.
L Simeon; F Duru; M Fluri; H R Jenzer; M Rahn; R Candinas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  23     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  2000 Nov 
Date Detail:
Created Date:  2001-01-03     Completed Date:  2001-02-22     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1788-91     Citation Subset:  IM    
Cardiac Arrhythmia Unit, University Hospital of Zurich, Rämistr. 100, Zurich, CH-8091 Switzerland.
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MeSH Terms
Arrhythmias, Cardiac / therapy*
Chronic Disease
Electric Power Supplies / statistics & numerical data
Electric Stimulation / instrumentation,  methods
Electrophysiologic Techniques, Cardiac / statistics & numerical data
Equipment Design / statistics & numerical data
Pacemaker, Artificial / statistics & numerical data*
Retrospective Studies
Sensory Thresholds*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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