Document Detail


Transmural right ventricular blood flow during acute pulmonary artery hypertension in the sedated dog. Evidence for subendocardial ischemia despite residual vasodilator reserve.
MedLine Citation:
PMID:  7094229     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Right ventricular failure during acute pressure overload has been attributed to ischemia which occurs when maximal coronary vasodilation is achieved so that further increases in myocardial blood flow cannot occur. To test the hypothesis that coronary vasodilator reserve is exhausted during acute right ventricular pressure overload, right and left ventricular myocardial blood flow was measured in 14 awake dogs during progressive pulmonary artery occlusion; coronary vasodilator reserve was tested by infusion of adenosine (4 microM/kg per min) before and during pulmonary artery occlusion. Right ventricular myocardial blood flow rose from 0.77 +/- 0.09 ml/min per g (mean +/- SEM) during control conditions to 1.69 +/- 0.27 ml/min per g during moderate pulmonary artery occlusion (P less than 0.01). With further pulmonary artery occlusion to cause increased right ventricular end-diastolic pressure and decreased aortic pressure, a selective decrease in myocardial blood flow to the right ventricular subendocardium was observed, and the right ventricular subendocardial-to-subepicardial blood flow ratio fell from 1.36 +/- 0.14 to 0.77 +/- 0.06 (P less than 0.05). With restoration of mean aortic pressure to control levels, right ventricular systolic pressure increased, right ventricular end-diastolic pressure decreased, and the right ventricular subendocardial-to-subepicardial ratio increased to 1.36 +/- 0.18 (P less than 0.01). Adenosine infusion during pulmonary artery occlusion in five dogs caused an increase in mean right ventricular blood flow (1.11 +/- 0.10 to 2.25 +/- 0.30; P less than 0.05). This increase was most marked in the outer layers but, nevertheless, was also significant in the subendocardium. These data indicate that acute severe right ventricular pressure overload may be associated with right ventricular subendocardial hypoperfusion, even when coronary vasodilator reserve is not exhausted.
Authors:
F L Gold; R J Bache
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation research     Volume:  51     ISSN:  0009-7330     ISO Abbreviation:  Circ. Res.     Publication Date:  1982 Aug 
Date Detail:
Created Date:  1982-09-17     Completed Date:  1982-09-17     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0047103     Medline TA:  Circ Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  196-204     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adenosine / pharmacology
Animals
Blood Pressure
Coronary Circulation*
Coronary Disease / physiopathology
Dogs
Endocardium / physiopathology
Heart Ventricles*
Hypertension, Pulmonary / physiopathology*
Hypnotics and Sedatives / pharmacology*
Pulmonary Artery / physiopathology
Vasodilation / drug effects*
Grant Support
ID/Acronym/Agency:
HL-20598/HL/NHLBI NIH HHS; HL-21872/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Hypnotics and Sedatives; 58-61-7/Adenosine

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


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