Document Detail

Efficacy of low-energy T wave shocks for induction of ventricular fibrillation in patients with implantable cardioverter defibrillators.
MedLine Citation:
PMID:  9533375     Owner:  NLM     Status:  MEDLINE    
The efficacy of low-energy T wave shocks for induction of ventricular fibrillation (VF) was evaluated in 33 patients undergoing implantable cardioverter defibrillator (ICD) implantation (33 sessions) or predischarge ICD testing (20 sessions). To induce VF, the ventricle was paced for eight cycles at a 400-ms cycle length (S1-S1), and the T wave was scanned with a monophasic shock (S2) delivered via the defibrillating lead system. Of 294 attempts, the T wave shocks induced VF in 65%, nonsustained ventricular tachycardia in 10%, and less than five ventricular beats in 25%. As compared with the failed T shocks, the mean energy of successful T wave shocks was higher and the S1-S2 coupling interval was shorter. When the S2 timing was examined in relation to the T wave peak, the VF induction efficacy was 37% for shocks delivered more than 70 ms before the T wave peak, 82% for shocks delivered 30-70 ms before the T wave peak, and 50% for shocks delivered less than 30 ms before or just after the T wave peak (P < .001). Thus, in patients undergoing ICD implantation or ICD conversion testing, the use of low-energy T wave shocks is an effective and safe method to provoke VF.
A K Bhandari; N Isber; M Estioko; T Ziccardi; D S Cannom; Y Park; R D Lerman; C Prejean; G W Sun
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of electrocardiology     Volume:  31     ISSN:  0022-0736     ISO Abbreviation:  J Electrocardiol     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-05-18     Completed Date:  1998-05-18     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  31-7     Citation Subset:  IM    
Heart Institute of the Good Samaritan Hospital, Los Angeles, California 90017, USA.
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MeSH Terms
Aged, 80 and over
Defibrillators, Implantable*
Electric Countershock / methods*
Middle Aged
Reproducibility of Results
Ventricular Fibrillation* / physiopathology

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

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