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Left ventricular geometry and function in experimental heart failure.

C W Tomlinson1

  • 1Department of Internal Medicine, Faculty of Medicine, University of British Columbia, Vancouver.

The Canadian Journal of Cardiology
|September 1, 1987
PubMed
Summary
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Left ventricular shape changes may indicate early heart dysfunction before measurable declines in ejection fraction or cardiac output. This finding highlights shape as a crucial biomarker for cardiac adaptation to stress.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Animal Models

Background:

  • Left ventricular (LV) shape is vital for cardiac adaptation to stress.
  • Hemodynamic compromise should manifest as alterations in LV shape.

Purpose of the Study:

  • To investigate the relationship between left ventricular shape and cardiac function.
  • To determine if shape alterations can predict early cardiomyopathy before functional decline.

Main Methods:

  • Two-dimensional echocardiography was used to obtain shape indices (2D and 3D) in dogs.
  • Adriamycin was administered serially to induce cardiomyopathy.
  • LV shape and hemodynamic parameters (ejection fraction, stroke volume, cardiac index) were assessed serially.

Main Results:

Related Experiment Videos

  • Early adriamycin treatment (144 mg/m2) impaired LV systolic elliptical configuration without significant changes in ejection fraction, stroke volume, or cardiac index.
  • Higher adriamycin doses (244 mg/m2) led to gradual reductions in these hemodynamic parameters.
  • Strong negative correlations were found between ejection fraction reduction and changes in 2D (-0.803) and 3D (-0.855) shape indices.

Conclusions:

  • Left ventricular shape is intrinsically linked to cardiac function.
  • Loss of elliptical shape during systole may serve as an early indicator of impaired cardiac function.
  • Shape analysis offers a potential non-invasive method for early detection of cardiomyopathy.