Document Detail


Effect of left ventricular hypertrophy secondary to chronic pressure overload on transmural myocardial 2-deoxyglucose uptake. A 31P NMR spectroscopic study.
MedLine Citation:
PMID:  7648676     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: This study tested the hypothesis that 31P nuclear magnetic resonance (NMR)-detectable 2-deoxyglucose (2DG) uptake is increased in chronically pressure-overloaded hypertrophied left ventricular myocardium. METHODS AND RESULTS: 31P NMR spectroscopy was used to determine the transmural distribution of high-energy phosphate levels and 2-deoxyglucose-6-phosphate (2DGP) accumulation during intracoronary infusion of 2DG (15 mumol.kg body wt-1.min-1) in eight normal dogs and in eight dogs with severe left ventricular hypertrophy (LVH) produced by ascending aortic banding. The ratio of LV weight to body weight was 8.25 +/- 0.65 g/kg in the LVH group compared with 4.35 +/- 0.11 g/kg in the normal group (P < .01). Myocardial ATP content was decreased by approximately 40% and phosphocreatine (PCr) by approximately 60% in LVH hearts. ATP values were transmurally uniform in LVH and normal hearts, whereas PCr was lower in the subendocardium (Endo) than the subepicardium (Epi) of both groups. The PCr/ATP ratio was lower in LVH hearts (1.72 +/- 0.05, 1.64 +/- 0.07, and 1.53 +/- 0.10 in Epi, midwall, and Endo, respectively) compared with normal hearts (2.36 +/- 0.05, 2.09 +/- 0.06, and 1.96 +/- 0.06; each P < .01 normal versus LVH). Arterial blood levels of glucose, insulin, and free fatty acids were comparable between groups, whereas arterial lactate and norepinephrine levels were significantly higher in the LVH group. 2DG infusion did not affect systemic hemodynamics or myocardial high-energy phosphate or inorganic phosphate levels in either group. At the end of 60 minutes of 2DG infusion, there was no detectable accumulation of 2DGP in the normal hearts. However, seven of the eight LVH hearts showed time-dependent accumulation of 2DGP, which was linearly related to the severity of hypertrophy (r = .90 for subendocardial 2DGP versus LV weight/body weight). A transmural gradient of 2DGP was present, with greatest accumulation in the subendocardium (3.3 +/- 1.6, 5.8 +/- 2.3, and 7.9 +/- 2.2 mumol/g in Epi, midwall, and Endo of the LVH hearts, respectively; P < .05 Epi versus Endo). CONCLUSIONS: The pressure-overloaded hypertrophied left ventricle demonstrated increased accumulation of 2DGP detected with 31P NMR spectroscopy. Accumulation of 2DGP was positively correlated with the degree of hypertrophy and was most marked in the subendocardium.
Authors:
J Zhang; D J Duncker; X Ya; Y Zhang; T Pavek; H Wei; H Merkle; K Uğurbil; A H From; R J Bache
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Publication Detail:
Type:  Comparative Study; 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:  Circulation     Volume:  92     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1995 Sep 
Date Detail:
Created Date:  1995-09-25     Completed Date:  1995-09-25     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1274-83     Citation Subset:  AIM; IM    
Affiliation:
Department of Medicine, University of Minnesota Health Sciences Center, Minneapolis, USA.
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / metabolism
Animals
Coronary Circulation / physiology
Deoxyglucose / diagnostic use*
Dogs
Energy Metabolism / physiology
Glucose-6-Phosphate* / analogs & derivatives*
Glucosephosphates / metabolism
Hypertension / complications
Hypertrophy, Left Ventricular / etiology,  metabolism*
Magnetic Resonance Spectroscopy / diagnostic use
Myocardium / metabolism*
Phosphocreatine / metabolism
Ventricular Pressure / physiology
Grant Support
ID/Acronym/Agency:
HL-21872/HL/NHLBI NIH HHS; HL-32427/HL/NHLBI NIH HHS; HL-33600/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Glucosephosphates; 154-17-6/Deoxyglucose; 3573-50-0/2-deoxyglucose-6-phosphate; 56-65-5/Adenosine Triphosphate; 56-73-5/Glucose-6-Phosphate; 67-07-2/Phosphocreatine

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


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