Document Detail


Impedance changes during catheter ablation and their relationship to electrical arcing and clinical efficacy.
MedLine Citation:
PMID:  2466247     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study has used high energy ablative shocks in saline and in man to characterize the complex, energy dependent behavior of the impedance at the electrode-tissue interface. In vitro shocks showed a fall in impedance when an arc was formed, due to formation around the electrode of a vapor globe rendered conductive by the arc. Following arc extinction, this same vapor globe insulates the electrode, and subsequently collapses, forming a shock wave, and allowing current flow to resume. Shocks delivered to tissue specimens exhibited progressively higher impedance and less insulation as contact pressure was increased. In vivo, lesser degrees of insulation during arcing shocks were associated with greater clinical efficacy.
Authors:
D Cunningham; A J Ahsan; E Rowland; A F Rickards
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  12     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1989 Jan 
Date Detail:
Created Date:  1989-04-14     Completed Date:  1989-04-14     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  144-9     Citation Subset:  IM    
Affiliation:
National Heart Hospital, London, UK.
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MeSH Terms
Descriptor/Qualifier:
Animals
Electric Conductivity
Electric Countershock
Electrocoagulation*
Heart Conduction System / surgery*
Humans
Microelectrodes
Pressure
Sodium Chloride
Swine
Chemical
Reg. No./Substance:
7647-14-5/Sodium Chloride

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


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