Document Detail


The effect of shock separation time on multiple-shock defibrillation.
MedLine Citation:
PMID:  634187     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Reports in the literature of studies of the efficacy of multiple, staggered shocks used for cardiac defibrillation have shown widely varying results. Twin half sinusoids, separated by an integral number of 60-Hz half-cycles, were used for transthoracic defibrillation of dogs. The separation of the pulses was varied from 0 to 13 half-cycles (0 to 108 msec). An online computer was used to determine the energy content of each shock and to obtain curves of the percentage of success vs energy, current, and voltage. The results show that 2 pulses, separated by 9 half-cycles (75 msec), require 57 percent of the peak current and 87 percent of the peak voltage required by a single pulse. The energy requirement, however, was 9.9 percent higher with the staggered shock. Other pulse separations required higher voltages and currents. Possible mechanisms for the effect are discussed.
Authors:
T W Moore; F N DiMeo; S E Dubin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medical instrumentation     Volume:  12     ISSN:  0090-6689     ISO Abbreviation:  Med Instrum     Publication Date:    1978 Jan-Feb
Date Detail:
Created Date:  1978-05-17     Completed Date:  1978-05-17     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0361136     Medline TA:  Med Instrum     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  31-3     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Dogs
Electric Countershock*
Electricity
Time Factors

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


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