Document Detail


Adenine nucleotides and ventricular fibrillation.
MedLine Citation:
PMID:  2448489     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The isolated perfused rat heart was used to study the influence of adenine nucleotides and their metabolites on vulnerability to ventricular fibrillation. In this model the incidence of ventricular arrhythmias after coronary artery ligation is determined by the extracellular K+ concentration; with perfusate K+ of 2.0 and 3.0 mmol/l hearts develop a high incidence of ventricular arrhythmias and fibrillation while arrhythmias are not encountered with perfusate K+ of 9.0 mmol/l. Assay of adenine nucleotides in uninvolved and ischaemic myocardium of these hearts showed a direct relationship between incidence of ventricular fibrillation and tissue levels of cyclic AMP but not tissue levels of lactate, high energy phosphates, adenosine, inosine and hypoxanthine/xanthine. Administration of dibutyryl cyclic AMP to isolated rat hearts reduced the ventricular fibrillation threshold; this action of cyclic AMP was effectively antagonized by adenosine and its N-ethylcarboxamido analogue but not by 2-chloroadenosine, phenylisopropyladenosine, cyclohexyladenosine and the adenosine deaminase inhibitor, EHNA. 2-Chloroadenosine, like adenosine, inhibited the increase in heart rate caused by DBcAMP. All the adenosine analogues had antiarrhythmic activity against spontaneously occurring ventricular arrhythmias during coronary artery occlusion. Adenosine analogues also antagonized the effect of dibutyryl cyclic AMP whereby it prolongs the QT interval. Adenosine, by as yet incompletely defined mechanisms, may act as an antagonist to the cyclic AMP mediated increase in vulnerability which contributes to the genesis of ventricular fibrillation in the early phase of myocardial ischaemia.
Authors:
W F Lubbe; A I Gilchrist; R K Holland; J Pybus
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of molecular and cellular cardiology     Volume:  19 Suppl 5     ISSN:  0022-2828     ISO Abbreviation:  J. Mol. Cell. Cardiol.     Publication Date:  1987 Oct 
Date Detail:
Created Date:  1988-03-15     Completed Date:  1988-03-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0262322     Medline TA:  J Mol Cell Cardiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  23-33     Citation Subset:  IM    
Affiliation:
Department of Medicine, University of Auckland, New Zealand.
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MeSH Terms
Descriptor/Qualifier:
Adenine Nucleotides / metabolism*
Animals
Coronary Disease / complications
Cyclic AMP / metabolism
Heart
Ion Channels / metabolism
Perfusion
Potassium / metabolism
Rats
Ventricular Fibrillation / etiology*,  metabolism
Chemical
Reg. No./Substance:
0/Adenine Nucleotides; 0/Ion Channels; 60-92-4/Cyclic AMP; 7440-09-7/Potassium

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


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