Title of article :
Capillary density of skeletal muscle: contributing mechanism for exercise intolerance in class II–III chronic heart failure independent of other peripheral alterations
Author/Authors :
Brian D. Duscha، نويسنده , , William E. Kraus، نويسنده , , Steven J Keteyian، نويسنده , , Martin J Sullivan، نويسنده , , Howard J Green، نويسنده , , Fred H Schachat، نويسنده , , Anne M Pippen، نويسنده , , Clinton Brawner، نويسنده , , Jason M Blank، نويسنده , , Brian H. Annex، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1999
Pages :
8
From page :
1956
To page :
1963
Abstract :
OBJECTIVES The study was conducted to determine if the capillary density of skeletal muscle is potential contributor to exercise intolerance in class II–III chronic heart failure (CHF). BACKGROUND Previous studies suggest that abnormalities in skeletal muscle histology, contractile protein content and enzymology contribute to exercise intolerance in CHF. METHODS The present study examined skeletal muscle biopsies from 22 male patients with CHF compared with 10 age-matched normal male control patients. Aerobic capacities, myosin heavy chain (MHC) isoforms, enzymes, and capillary density were measured. RESULTS The patients with CHF demonstrated reduced peak oxygen consumption when compared to controls (15.0 ± 2.5 vs. 19.8 ± 5.0 ml·kg−1·min−1, p <0.05). Using cell-specific antibodies to directly assess vascular density, there was reduction in capillary density in CHF measured as the number of endothelial cells/fiber (1.42 ± 0.28 vs. 1.74 ± 0.35, p = 0.02). In CHF, capillary density was inversely related to maximal oxygen consumption (r = 0.479, p = 0.02). The MHC IIx isoform was found to be higher in patients with CHF versus normal subjects (28.5 ± 13.6 vs. 19.5 ± 9.4, p <0.05). CONCLUSIONS There was significant reduction in microvascular density in patients with CHF compared with the control group, without major differences in other usual histologic and biochemical aerobic markers. The inverse relationship with peak oxygen consumption seen in the CHF group suggests that reduction in microvascular density of skeletal muscle may precede other skeletal muscle alterations and play critical role in the exercise intolerance characteristic of patients with CHF.
Keywords :
MHC , nuclear magnetic resonance , NMR , chronic heart failure , myosin heavy chain , MET , CHF , LVEF , left ventricular ejection fraction , metabolic equivalent , arteriovenous-oxygen difference , A-Vo2
Journal title :
JACC (Journal of the American College of Cardiology)
Serial Year :
1999
Journal title :
JACC (Journal of the American College of Cardiology)
Record number :
481194
Link To Document :
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