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Related Experiment Videos

Myocardial oxygen utilization after reversible global ischemia.

J E Bavaria1, S Furukawa, G Kreiner

  • 1Division of Cardiothoracic Surgery, University of Pennsylvania, Philadelphia.

The Journal of Thoracic and Cardiovascular Surgery
|August 1, 1990
PubMed
Summary

Global myocardial ischemia significantly increases oxygen consumption in sheep hearts, impairing oxygen utilization efficiency. This "stunned" myocardium shows increased vulnerability to further ischemic events, especially with diseased coronary vessels.

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Area of Science:

  • Cardiovascular Physiology
  • Myocardial Metabolism

Background:

  • Reversible global myocardial ischemia can lead to myocardial stunning.
  • Understanding the metabolic changes post-ischemia is crucial for cardiac health.

Purpose of the Study:

  • To investigate the hypothesis that oxygen consumption increases after reversible, global myocardial ischemia.
  • To quantify the relationship between left ventricular oxygen consumption and systolic wall stress post-ischemia.

Main Methods:

  • Twenty sheep were used to test the hypothesis.
  • Left ventricular oxygen consumption (LVO2) was measured before and after 25 minutes of warm global ischemia.
  • LVO2 was linearly related to the integral of left ventricular circumferential systolic wall stress, with altered afterload.

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Main Results:

  • A significant, fourfold increase in the slope of the LVO2-wall stress relationship was observed post-ischemia (4.35 vs. 1.06, p=0.0001).
  • This indicates a massive increase in oxygen consumption in globally stunned myocardium.
  • The relationship between LVO2 and wall stress was described by regression equations for pre- and post-ischemic states.

Conclusions:

  • Globally stunned myocardium exhibits severely impaired oxygen utilization efficiency.
  • Post-ischemic hearts are more vulnerable to further ischemia, particularly in the presence of coronary artery disease.