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Ventricular remodeling in global ischemia

P Anversa1, X Zhang, P Li

  • 1Department of Medicine, New York Medical College, Valhalla, USA.

Cardioscience
|June 1, 1995
PubMed
Summary

Chronic left coronary artery constriction in rats causes cardiac dysfunction and failure. This leads to ventricular remodeling, increased wall stress, and myocyte loss, despite compensatory hypertrophy and hyperplasia in remaining heart tissue.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Pathophysiology
  • Myocardial Remodeling

Background:

  • Chronic constriction of the left coronary artery is a model for studying heart disease.
  • Understanding the structural and functional consequences of coronary artery disease is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the effects of chronic left coronary artery constriction on cardiac function and structure in a rat model.
  • To examine ventricular pump performance, myocardial damage, and myocyte response following coronary artery narrowing.

Main Methods:

  • Surgical induction of coronary artery narrowing in rats.
  • Assessment of cardiac hemodynamics, ventricular function, and myocardial damage.
  • Evaluation of myocyte hypertrophy, hyperplasia, and DNA synthesis.

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Main Results:

  • Coronary artery constriction induced cardiac dysfunction and failure, with distinct physiological characteristics.
  • Left ventricular hypertrophy, dilatation, and wall thinning were observed, more severe in failing hearts.
  • Myocardial damage was widespread, particularly in the endocardium and in failing rats, leading to increased diastolic wall stress and depressed ventricular performance.
  • Myocyte cell loss and hypertrophy were exacerbated in ventricular failure, with evidence of DNA synthesis and mitotic division.

Conclusions:

  • A fixed left coronary artery lesion causes significant cardiac abnormalities, including increased diastolic wall stress and ventricular remodeling.
  • Compensatory myocyte hypertrophy and hyperplasia occur in viable tissue, but are insufficient to prevent progressive cardiac dysfunction and failure.
  • The findings highlight the complex interplay between hemodynamic changes, tissue injury, and cellular responses in the development of heart failure.