Document Detail

Relationship between pacemaker fibrillation thresholds and electrode area.
MedLine Citation:
PMID:  1143115     Owner:  NLM     Status:  MEDLINE    
Energy thresholds for electrical pacing of the heart are lower with small electrodes than with large. Because pacing of the heart during the vulnerable period may produce ventricular fibrillation, it is also pertinent to know if fibrillation threshold is affected by the electrode size. Electrodes of different surface area but of the same material were implanted in 40 dogs and the pacing thresholds were recorded. Ventricular fibrillation was electrically induced by discharging a 2-msec d.c. cathodal pulse of progressively increasing energy into the vulnerable period. It was found that small electrodes required more energy to produce ventricular fibrillation than large electrodes, and the ratio of fibrillation to stimulation threshold was higher for the small-surface-area electrode. The difference between the thresholds and ratios obtained with the various electrodes was statistically significant. A similar experiment was performed in animals with chronically implanted electrodes, producing comparable results. The results indicate that, in regard to pacing and fibrillation thresholds, small electrodes are preferable to large.
P Chen; G H Myers; V Parsonnet; K Chatterjee; P Katz
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Medical instrumentation     Volume:  9     ISSN:  0090-6689     ISO Abbreviation:  Med Instrum     Publication Date:    1975 Jul-Aug
Date Detail:
Created Date:  1975-10-10     Completed Date:  1975-10-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0361136     Medline TA:  Med Instrum     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  165-70     Citation Subset:  IM    
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MeSH Terms
Differential Threshold
Electrodes, Implanted
Pacemaker, Artificial* / adverse effects,  instrumentation
Ventricular Fibrillation / etiology*

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

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