Document Detail


Progressive cardiac dysfunction with repeated pacing-induced ischemia: protection by AICA-riboside.
MedLine Citation:
PMID:  1951744     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of repeated episodes of demand-induced ischemia on regional myocardial wall thickening, endocardial electrogram, and regional myocardial blood flow are not well delineated. We studied the cumulative effects of six periods of pacing-induced ischemia in 35 chloralose-anesthetized dogs with circumflex coronary stenosis. Repetitive ischemia of the posterior left ventricular free wall was induced with six 5-min pacing periods separated by 15-min recovery periods. The three groups of dogs studied were 1) saline control, 2) the purine precursor 5-aminoimidazole 4-carboxamide riboside (AICA-r), and 3) nitroglycerin (NTG). During the initial pacing period (before treatment), thickening of the posterior wall declined in the saline group (43 +/- 5% of control), the AICA-r group (47 +/- 8% of control), and the NTG group (55 +/- 3% of control), associated with endocardial S-T segment elevation and a decrease in subendocardial blood flow. Wall thickening continued to decrease in each group with each successive pacing episode. However, during the sixth pacing period wall thickening was significantly (P less than 0.05) less in the saline group (2 +/- 5% of control) than in the AICA-r (31 +/- 7% of control) or NTG (61 +/- 7% of control) group. The progressive decline in wall thickening was accompanied by a further decrease in subendocardial blood flow and a rise in S-T segment in the saline group but not in the AICA-r or NTG group (P less than 0.05). These results demonstrate that sequential periods of ischemia and reperfusion cause a progressive decline in regional wall motion, coincident with a progressive decrease in subendocardial blood flow.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
M A Young; K M Mullane
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  261     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1991 Nov 
Date Detail:
Created Date:  1991-12-23     Completed Date:  1991-12-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H1570-7     Citation Subset:  IM    
Affiliation:
Research Department, Gensia Pharmaceuticals, San Diego, California 92121.
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MeSH Terms
Descriptor/Qualifier:
Aminoimidazole Carboxamide / analogs & derivatives*,  pharmacology
Analysis of Variance
Animals
Blood Pressure / drug effects
Coronary Circulation
Coronary Disease / physiopathology*,  prevention & control
Dogs
Endocardium / drug effects,  physiopathology
Heart / drug effects,  physiopathology*
Heart Rate / drug effects
Male
Nitroglycerin / pharmacology*
Ribonucleotides / pharmacology*
Chemical
Reg. No./Substance:
0/Ribonucleotides; 3031-94-5/AICA ribonucleotide; 360-97-4/Aminoimidazole Carboxamide; 55-63-0/Nitroglycerin

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


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