Document Detail


Arachidonic acid cascade and the generation of ischemia- and reperfusion-induced ventricular arrhythmias.
MedLine Citation:
PMID:  2410739     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This article reviews the evidence we found in our study that the local generation of thromboxane and prostacyclin is one important factor involved in determining the severity of the ventricular arrhythmias that result from acute myocardial ischaemia and subsequent reperfusion. The hypothesis examined is that thromboxane release, presumably from platelets, is harmful in the early stages of ischaemia (perhaps because this induces further platelet aggregation and/or a reduction in blood flow as a result of both active vasoconstriction and of mechanical obstruction) and that prostacyclin generation (presumably mainly from endothelial cells) is beneficial at this time. The evidence is that in anaesthetised greyhound dogs, blockade of the thromboxane receptor (AH 23848) or inhibition of thromboxane synthesis (with a variety of "specific" inhibitors of thromboxane synthetase such as dazoxiben, dazmegrel, and "low-dose" aspirin) slightly reduces the severity of ischaemia-induced arrhythmias and markedly increases survival after myocardial reperfusion by reducing reperfusion-induced ventricular fibrillation (e.g., from 80% in control dogs to less than 20% in treated dogs). The evidence that prostacyclin generation is helpful in this situation comes from studies with locally infused prostacyclin or iloprost and with nafazatrom, a drug that increases the amount of prostacyclin released into local coronary venous blood soon after the onset of myocardial ischaemia; these procedures also reduce the number of ventricular extrasystoles occurring during ischaemia and the incidence of reperfusion-induced ventricular fibrillation. These findings do not imply that arachidonic acid derivatives are the only, or even the main, biochemical factor involved in the generation of these arrhythmias.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
J R Parratt; S J Coker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cardiovascular pharmacology     Volume:  7 Suppl 5     ISSN:  0160-2446     ISO Abbreviation:  J. Cardiovasc. Pharmacol.     Publication Date:  1985  
Date Detail:
Created Date:  1985-09-06     Completed Date:  1985-09-06     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7902492     Medline TA:  J Cardiovasc Pharmacol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  S65-70     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Arachidonic Acid
Arachidonic Acids / metabolism*
Arrhythmias, Cardiac / etiology*
Coronary Disease / complications,  metabolism*
Dogs
Epoprostenol / pharmacology,  secretion
Iloprost
Norepinephrine / secretion
Perfusion
Pyrazoles / pharmacology
Pyrazolones*
Receptors, Prostaglandin / drug effects
Receptors, Thromboxane
Thromboxanes / biosynthesis,  secretion
Chemical
Reg. No./Substance:
0/Arachidonic Acids; 0/Pyrazoles; 0/Pyrazolones; 0/Receptors, Prostaglandin; 0/Receptors, Thromboxane; 0/Thromboxanes; 35121-78-9/Epoprostenol; 506-32-1/Arachidonic Acid; 51-41-2/Norepinephrine; 59040-30-1/nafazatrom; 78919-13-8/Iloprost

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


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