Document Detail


The effect of adrenaline and high Ca2+ on the mechanical performance and oxygen consumption of the isolated perfused trout (Oncorhynchus mykiss) heart.
MedLine Citation:
PMID:  17490904     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In heart muscle from mammals, catecholamines frequently evoke an oxygen waste and reduce efficiency. It was examined if this also applies to fish in which heart muscle activity is often restricted by oxygen availability. In the isolated perfused heart from rainbow trout, adrenaline (0.5 microM) increased power output by approximately 97%, when afterload was adjusted to maximum both before and after adrenaline addition, and by approximately 68%, when afterload remained at the maximum obtained before adrenaline addition. Oxygen consumption was enhanced by a similar amount (approximately 70%) in both situations. Hence, efficiency, i.e. power output/oxygen consumption, increased significantly from 25 to 30% for the heart always exposed to maximal afterload, whereas it stayed unchanged at 24% for the heart exposed to control afterload only. Adrenaline increases the Ca2+ activity participating in activation, but doing this by elevating perfusate Ca2+ from 1.5 to 5 mM instead of applying adrenaline did not change the mechanical efficiency, although afterload was maximized. The results suggest that catecholamines enhance heart pump activity in the living trout without any oxygen waste. On the contrary, the oxygen budget may even improve when the peripheral resistance is increased by catecholamines.
Authors:
D Rytter; H Gesser
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Publication Detail:
Type:  In Vitro; Journal Article     Date:  2007-04-11
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  147     ISSN:  1095-6433     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-06-05     Completed Date:  2007-08-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1083-9     Citation Subset:  IM    
Affiliation:
Institute of Biological Sciences, University of Aarhus, Building 1131, DK-8000 Aarhus C, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Animals
Calcium / pharmacology*
Cardiac Output / drug effects
Epinephrine / pharmacology*
Heart / drug effects*,  physiology*
Oxygen Consumption / drug effects*
Perfusion*
Trout / physiology*
Chemical
Reg. No./Substance:
51-43-4/Epinephrine; 7440-70-2/Calcium

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


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