Document Detail

Oxygen cost of stress development in hypertrophied and failing hearts from the spontaneously hypertensive rat.
MedLine Citation:
PMID:  8418024     Owner:  NLM     Status:  MEDLINE    
Left ventricular isovolumic stress development and metabolic parameters were studied in 18-24-month-old spontaneously hypertensive rats (SHRs) and age-matched Wistar-Kyoto (WKY) rat controls using the isolated, isovolumic (balloon in left ventricle) buffer-perfused rat heart preparation. After WKY rats and all SHRs were compared, SHRs were divided into two groups: those animals with (SHR-F) and without (SHR-NF) evidence of heart failure. Hearts were perfused at 100 mm Hg using a constant pressure system at a temperature of 37 degrees C. In the baseline state, peak systolic pressure was greatest in the SHR-NF group and lowest in the SHR-F group. Peak midwall stress was greatest in the WKY group and, again, lowest in the SHR-F group. Oxygen consumption was lowest in the SHR-F group. When the oxygen cost of stress development was estimated by normalizing myocardial oxygen consumption by peak developed midwall stress, values were lowest in the WKY, greater in the SHR-NF, and greatest in the SHR-F group. Lactate production did not occur in the baseline state in any of the groups. Functional and metabolic responses to graded hypoxia, induced by changing the gas mixture of the perfusate from 95% to 50%, 25%, and 0% oxygen at perfusion pressures of 100 and 130 mm Hg, were studied. Increasing perfusion pressure generally resulted in small increases in peak systolic pressure and myocardial oxygen consumption but did not substantially reverse the contractile or metabolic deficit present in the SHR-F group.(ABSTRACT TRUNCATED AT 250 WORDS)
W W Brooks; N A Healey; S Sen; C H Conrad; O H Bing
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hypertension     Volume:  21     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:  1993 Jan 
Date Detail:
Created Date:  1993-02-01     Completed Date:  1993-02-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  56-64     Citation Subset:  IM; S    
Medical Service, Boston VA Medical Center, MA 02130.
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MeSH Terms
Anoxia / metabolism
Cardiomegaly / metabolism*,  physiopathology
Heart Failure / metabolism*,  physiopathology
Hypertension / metabolism*,  physiopathology
Oxygen Consumption*
Rats, Inbred SHR
Rats, Inbred WKY
Stress, Mechanical
Grant Support

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