(Hypertension. 1999;33:676-680.)
© 1999 American Heart Association, Inc.
Scientific Contributions |
Gender-Related Differences in Myocyte Remodeling in Progression to Heart Failure
From The South Dakota Health Research Foundation-Cardiovascular Institute, Sioux Falls.
Correspondence to A. Martin Gerdes, PhD, South Dakota Health Research Foundation-Cardiovascular Research Institute, 1400 W 22nd St, Sioux Falls, SD 57105-1570. E-mail mgerdes{at}usd.edu
Abstract—Gender-related differences responsible for the better prognosis of females with heart failure have not been clearly established. To address this issue, we investigated potential gender-related differences in myocyte remodeling in spontaneously hypertensive heart failure rats. Echocardiograms and myocyte growth were compared between males and females at compensated (2, 4, and 6 months) and decompensated (18 months in males and 24 months in females) stages of cardiac hypertrophy. Although left ventricular diastolic dimensions did not differ significantly between failing male and female rats, fractional shortening declined significantly only in failing males. Myocyte cross-sectional area did not change after 4 months of age in both genders, which is likely to be responsible for the absence of a change in left ventricular wall thickness during the progression to heart failure. Myocyte volume and cross-sectional area were significantly larger in males than females at 2, 4, and 6 months of age, although there were no significant differences at the failing stage. Reduced adaptive hypertrophic reserve was observed in males, which is likely to contribute to the higher morbidity and mortality of males with chronic heart failure.
Key Words: heart failure • remodeling, ventricular • myocytes
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