Document Detail


Assessment of the efficacy of interventions to limit ischemic injury by direct measurement of intramural carbon dioxide tension after coronary artery occlusion in the dog.
MedLine Citation:
PMID:  105016     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Although numerous interventions have been shown to exert a salutary effect on the ischemic myocardium, the severity of ischemia generally has been measured by indirect techniques. In the present investigation the effect of ischemia on intramural carbon dioxide tension (PmCO(2)) was measured directly in the open-chest, anesthetized dog with a mass spectrometer during repetitive 10-min coronary artery occlusions separated by 45-min periods of reflow; simultaneously, regional myocardial blood flow in the ischemic area was measured by (127)Xenon washout. In all dogs the increase in PmCO(2) from before to 10 min after the first occlusion (DeltaPmCO(2)) exceeded that during subsequent occlusions. In those dogs not receiving an intervention (controls), DeltaPmCO(2) during the third occlusion was similar to that during the second occlusion. When propranolol, hyaluronidase, and nitroglycerin were administered to different groups of dogs before the third occlusion, each caused significantly smaller elevations in DeltaPmCO(2) than those occurring during the control second occlusion, and the combination of all three interventions induced the smallest increase in DeltaPmCO(2). Regional myocardial blood flow rose with hyaluronidase and was unchanged with propranolol, nitroglycerin, and the three drugs in combination. In contrast to these beneficial interventions, isoproterenol infused with the third occlusion caused a higher DeltaPmCO(2) than during the control second occlusion. It is concluded, first, that interventions that modify the severity of ischemia can be evaluated by measuring intramural carbon dioxide tension; second, that propranolol, hyaluronidase, and nitroglycerin reduce ischemic injury, whereas isoproterenol increases it; and third, that the combination of propranolol, hyaluronidase, and nitroglycerin exerts an additive beneficial effect on ischemia.
Authors:
L D Hillis; S F Khuri; E Braunwald; R A Kloner; D Tow; E Barsamian; P R Maroko
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of clinical investigation     Volume:  63     ISSN:  0021-9738     ISO Abbreviation:  J. Clin. Invest.     Publication Date:  1979 Jan 
Date Detail:
Created Date:  1979-04-25     Completed Date:  1979-04-25     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7802877     Medline TA:  J Clin Invest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  99-107     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Arterial Occlusive Diseases / physiopathology*
Carbon Dioxide / metabolism*
Coronary Disease / drug therapy*,  physiopathology
Coronary Vessels*
Dogs
Drug Therapy, Combination
Female
Hyaluronoglucosaminidase / pharmacology
Isoproterenol / pharmacology
Male
Myocardium / metabolism
Nitroglycerin / pharmacology
Propranolol / pharmacology
Regional Blood Flow / drug effects
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 525-66-6/Propranolol; 55-63-0/Nitroglycerin; 7683-59-2/Isoproterenol; EC 3.2.1.35/Hyaluronoglucosaminidase
Comments/Corrections

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


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