Document Detail


Age-related response of rabbit heart to normothermic ischemia: a 31P-MRS study.
MedLine Citation:
PMID:  1539698     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The age-related response of the myocardium to 30 min of 37 degrees C global ischemia and 120 min of 37 degrees C reperfusion, measured by phosphorus-31 magnetic resonance spectroscopy and the recovery of isovolumic function, was evaluated by using perfused neonatal (3-8 days old, n = 10), immature (24-30 days old, n = 10), and adult (2-4 mo old, n = 5) rabbit hearts. Basal intracellular pH (pHi) was highest in neonatal hearts and decreased with age. The basal phosphocreatine (PCr)-to-ATP ratio differed in each group, increasing with age. Rapid depletion of PCr occurred in all groups during ischemia; ATP retention was greater in adults than in neonates. Reperfusion resulted in no measurable recovery of ATP in any group. Postischemic pHi stabilized above preischemic values in neonatal and immature hearts and below preischemic values in adult hearts. Recovery of PCr and cytosolic Pi (Pcyi) content, heart rate, and coronary flow during reperfusion was greater in neonatal and immature than in adult hearts. During the final 20 min of ischemia, pHi was lower in immature than in neonatal or adult hearts. Postischemic recovery of left ventricular maximum rate of pressure rise (+dP/dtmax) was depressed in immature compared with neonatal and adult hearts. These results demonstrate increased tolerance of the neonatal heart and increased susceptibility of the immature heart to unprotected normothermic ischemic injury relative to the adult heart and suggest that maturational changes in myocardial pHi regulation may be responsible for the observed age-related response.
Authors:
L J Carr; Q M VanderWerf; S E Anderson; G J Kost
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  262     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1992 Feb 
Date Detail:
Created Date:  1992-04-01     Completed Date:  1992-04-01     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H391-8     Citation Subset:  IM    
Affiliation:
Department of Pathology, School of Medicine, University of California, Davis 95616.
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / metabolism
Aerobiosis
Aging / physiology*
Animals
Body Temperature*
Coronary Disease / diagnosis,  physiopathology*
Energy Metabolism
Hydrogen-Ion Concentration
Intracellular Membranes / metabolism
Magnetic Resonance Spectroscopy*
Myocardial Reperfusion
Myocardium / metabolism
Phosphocreatine / metabolism
Phosphorus
Rabbits
Grant Support
ID/Acronym/Agency:
RR-02479/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
56-65-5/Adenosine Triphosphate; 67-07-2/Phosphocreatine; 7723-14-0/Phosphorus

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


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