Document Detail


Contribution of specific skeletal muscle metabolic abnormalities to limitation of exercise capacity in patients with chronic heart failure: a phosphorus 31 nuclear magnetic resonance study.
MedLine Citation:
PMID:  7942449     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Several studies of phosphorus 31 (31P) magnetic resonance spectroscopy (MRS) have demonstrated the presence of skeletal muscle metabolic abnormalities during exercise in patients with chronic heart failure (CHF). We studied the contribution of these abnormalities to the limitation of exercise capacity in CHF. In 25 patients (age 57 +/- 2 years, left ventricular ejection fraction [LVEF] 28% +/- 1.6%, peak oxygen consumption (VO2) 16 +/- 1.2 ml/kg/mm) (mean +/- SEM), we studied the calf muscle at rest and during plantar flexion with 31P MRS. The phosphocreatine (PCr) depletion rate was significantly negatively correlated to peak VO2 (r = -0.62, p = 0.001) but not to LVEF. Muscle pH was correlated with the inorganic phosphorus (Pi)/PCr ratio (r = -0.69, p = 0.0001) and with the PCr/adenosine triphosphate beta (ATP beta) ratio (which negatively relates to adenosine diphosphate [ADP] concentration) (r = 0.65, p = 0.00001). Although muscle ATP (ATP/sum of phosphorus [sigma P] remained stable, in 8 patients ATP/sigma P decreased significantly (-15% +/- 4%, p = 0.0002). In this ATP-depleted group, peak VO2 was significantly lower than that of the nondepleted group and PCr depletion more rapid, whereas LVEF did not differ. Skeletal muscle metabolic abnormalities in CHF contribute markedly to the alteration of exercise capacity. Rapid PCr depletion and muscle acidosis are the most relevant abnormalities. ATP depletion and excessive increase in ADP during exercise may contribute further to exercise limitation specifically in patients with more marked CHF.
Authors:
Z Chati; F Zannad; B Robin-Lherbier; J M Escanye; C Jeandel; J Robert; E Aliot
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  128     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1994 Oct 
Date Detail:
Created Date:  1994-10-27     Completed Date:  1994-10-27     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  781-92     Citation Subset:  AIM; IM; S    
Affiliation:
Department of Cardiology, Hôpital Central, Nancy, France.
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MeSH Terms
Descriptor/Qualifier:
Adenosine Diphosphate / metabolism
Adenosine Triphosphate / metabolism
Adult
Aged
Analysis of Variance
Female
Heart Failure / metabolism*,  physiopathology
Humans
Magnetic Resonance Spectroscopy*
Male
Middle Aged
Muscle, Skeletal / metabolism*
Oxygen Consumption
Phosphocreatine / metabolism*
Physical Exertion*
Stroke Volume
Chemical
Reg. No./Substance:
56-65-5/Adenosine Triphosphate; 58-64-0/Adenosine Diphosphate; 67-07-2/Phosphocreatine

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


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