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Related Concept Videos

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Related Experiment Video

Updated: Jul 12, 2026

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
06:39

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Published on: April 13, 2015

Coronary cyclic flow variations "precondition" ischemic myocardium.

M Ovize1, R A Kloner, S L Hale

  • 1Heart Institute Hospital of the Good Samaritan, Los Angeles, CA 90017.

Circulation
|February 1, 1992
PubMed
Summary

Spontaneous coronary thrombus formation can precondition the heart, reducing infarct size similar to mechanical preconditioning. This protective effect of cyclic flow variations (CFV) persists even after longer ischemia, unlike mechanical preconditioning.

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Last Updated: Jul 12, 2026

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
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Area of Science:

  • Cardiovascular Science
  • Ischemic Heart Disease Research
  • Myocardial Protection Mechanisms

Background:

  • Mechanical preconditioning via brief coronary artery occlusion reduces infarct size.
  • The cardioprotective effects of spontaneous transient ischemia, like those in unstable angina, are unknown.

Purpose of the Study:

  • To determine if spontaneous thrombotic episodes limit infarct size and preserve contractile function after sustained ischemia and reperfusion in a canine model.
  • To compare the effects of mechanical preconditioning with spontaneous thrombotic episodes (cyclic flow variations - CFV).

Main Methods:

  • Canine model subjected to 60 or 90 minutes of sustained ischemia followed by reperfusion.
  • Treatment groups included control, mechanical preconditioning, and CFV induced by coronary artery stenosis and endothelial injury.
  • Infarct size and myocardial contractile function were assessed.

Main Results:

  • Both mechanical preconditioning and CFV significantly reduced infarct size after 60 minutes of ischemia.
  • After 90 minutes of ischemia, only CFV significantly reduced infarct size compared to controls.
  • Neither preconditioning method preserved contractile function during or after ischemia/reperfusion.

Conclusions:

  • Repeated coronary thrombus formation (CFV) effectively preconditions ischemic myocardium, offering protection that persists longer than mechanical preconditioning.
  • Preconditioning, whether mechanical or thrombotic, does not preserve contractile function during sustained ischemia or prevent post-reperfusion stunning.
  • Clinical episodes of unstable angina may precondition the myocardium, potentially influencing outcomes of acute myocardial infarction.