Document Detail

Studying semblances of a true killer: experimental model of human ventricular fibrillation.
MedLine Citation:
PMID:  22268105     Owner:  NLM     Status:  MEDLINE    
It is unknown whether ventricular fibrillation (VF) studied in experimental models represents in vivo human VF. First, we examined closed chest in vivo VF induced at defibrillation threshold testing (DFT) in four patients with ischemic cardiomyopathy pretransplantation. We examined VF in these same four hearts in an ex vivo human Langendorff posttransplantation. VF from DFT was compared with VF from the electrodes from a similar region in the right ventricular endocardium in the Langendorff using two parameters: the scale distribution width (extracted from continuous wavelet transform) and VF mean cycle length (CL). In a second substudy group where multielectrode phase mapping could be performed, we examined early VF intraoperatively (in vivo open chest condition) in three patients with left ventricular cardiomyopathy. We investigated early VF in the hearts of three patients in an ex vivo Langendorff and compared findings with intraoperative VF using two metrics: dominant frequency (DF) assessed by the Welch periodogram and the number of phase singularities (lasting >480 ms). Wavelet analysis (P = 0.9) and VF CL were similar between the Langendorff and the DFT groups (225 ± 13, 218 ± 24 ms; P = 0.9), indicating that wave characteristics and activation rate of VF was comparable between the two models. Intraoperative DF was slower but comparable with the Langendorff DF over the endocardium (4.6 ± 0.1, 5.0 ± 0.4 Hz; P = 0.9) and the epicardium (4.5 ± 0.2, 5.2 ± 0.4 Hz; P = 0.9). Endocardial phase singularity number (9.6 ± 5, 12.1 ± 1; P = 0.6) was lesser in number but comparable between in vivo and ex vivo VF. VF dynamics in the limited experimental human studies approximates human in vivo VF.
K Nair; T Farid; S Masse; K Umapathy; S Watkins; K Poku; J Asta; M Kusha; E Sevaptsidis; J Jacob; J S Floras; K Nanthakumar
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-01-20
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  302     ISSN:  1522-1539     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-04-02     Completed Date:  2012-05-15     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H1533-7     Citation Subset:  IM    
Division of Cardiology, University Health Network, Toronto General Hospital, University of Toronto, Ontario, Canada.
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MeSH Terms
Body Surface Potential Mapping
Data Interpretation, Statistical
Electric Countershock
Electrodes, Implanted
Endocardium / physiology
Heart Transplantation / physiology
Intraoperative Period
Middle Aged
Models, Theoretical
Myocardial Ischemia / physiopathology
Stroke Volume / physiology
Tachycardia, Ventricular / physiopathology
Ventricular Fibrillation / physiopathology*
Ventricular Function, Left / physiology

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

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