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Related Experiment Videos

Mechanism for depressed cardiac function in left ventricular volume overload.

W Holt1, W Auffermann, S T Wu

  • 1Department of Medicine, University of California, San Francisco 94143.

American Heart Journal
|February 1, 1991
PubMed
Summary

Increasing left ventricular volume initially boosts developed pressure but causes ischemia and reduced function at higher volumes. This volume overload impairs heart function through mechanical pressure and reduced oxygen supply.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Biophysics

Background:

  • Left ventricular developed pressure is crucial for cardiac output.
  • Understanding how chamber volume affects cardiac mechanics is essential for treating heart conditions.

Purpose of the Study:

  • To investigate the impact of varying left ventricular chamber volumes on cardiac function.
  • To elucidate the mechanisms underlying changes in left ventricular developed pressure under volume overload.

Main Methods:

  • Utilized isovolumic isolated perfused rat hearts.
  • Employed phosphorous-31 and hydrogen-1 nuclear magnetic resonance spectroscopy, echocardiography, and other techniques.
  • Monitored left ventricular pressure and intraventricular balloon volumes.

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Main Results:

  • Developed pressure showed a triphasic response: increasing, plateauing, then decreasing with rising volume.
  • Volume overload (≥250 µL) induced endocardial ischemia, altered water distribution, and thinned the ventricular wall.
  • Ischemia was evidenced by decreased developed pressure, impaired calcium transients, altered phosphorylation, and redox state.

Conclusions:

  • Mechanical pressure from volume overload causes cardiac ischemia and dysfunction.
  • High intracellular calcium during overload may result from compression and ischemia, increasing rigor cross-bridges and wall stress.