Document Detail

Effects of polarity on defibrillation thresholds using a biphasic waveform in a hot can electrode system.
MedLine Citation:
PMID:  9455750     Owner:  NLM     Status:  MEDLINE    
The polarity of a monophasic and biphasic shocks have been reported to influence DFTs in some studies. The purpose of this study was to evaluate the effect of the first phase polarity on the DFT of a biphasic shock utilizing a nonthoracotomy "hot can" electrode configuration which had a 90-microF capacitance. We tested the hypothesis that anodal first phase was more effective than cathodal ones for defibrillation using biphasic shocks in ten anesthetized pigs weighing 38.9 +/- 3.9 kg. The lead system consisted of a right ventricular catheter electrode with a surface area of 2.7 cm2 and a left pectoral "hot can" electrode with 92.9 cm2 surface area. DFT was determined using a repeated "down-up" technique. A shock was tested 10 seconds after initiation of ventricular fibrillation. The mean delivered energy at DFT was 11.2 +/- 1.7 J when using the right ventricular apex electrode as the cathode and 11.3 +/- 1.2 J (P = NS) when using it as the anode. The peak voltage at DFT was also not significantly different (529.0 +/- 41.3 and 531.8 +/- 28.6 V, respectively). We concluded that the first phase polarity of a biphasic shock used with a nonthroracotomy "hot can" electrode configuration did not affect DFT.
Y Yamanouchi; K A Mowrey; G R Nadzam; D G Hills; M W Kroll; J E Brewer; A M Donohoo; B L Wilkoff; P J Tchou
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  20     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-03-04     Completed Date:  1998-03-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2911-6     Citation Subset:  IM    
Department of Cardiology, Cleveland Clinic Foundation, OH 44195, USA.
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MeSH Terms
Disease Models, Animal
Electric Countershock* / instrumentation,  methods
Heart Catheterization
Treatment Outcome
Ventricular Fibrillation / physiopathology,  therapy*

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