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Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
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Coronary sinus occlusion enhances coronary collateral flow and reduces subendocardial ischemia

A Ido1, N Hasebe, H Matsuhashi

  • 1First Department of Internal Medicine, Asahikawa Medical College, Asahikawa 078-8510, Japan.

American Journal of Physiology. Heart and Circulatory Physiology
|February 17, 2001
PubMed

Insights

Coronary sinus occlusion (CSO) enhances blood flow to the heart muscle during ischemia. This intervention improves blood supply to the subendocardium, potentially preserving ischemic heart tissue.

Area of Science:

  • Cardiovascular Physiology
  • Myocardial Ischemia Research

Background:

  • Myocardial ischemia poses a significant threat to cardiac function.
  • Coronary collateral blood flow is crucial for mitigating ischemic damage.

Purpose of the Study:

  • To investigate the effects of coronary sinus occlusion (CSO) on coronary collateral blood flow.
  • To determine the impact of CSO on regional myocardial blood flow (RMBF) distribution during ischemia.

Main Methods:

  • Utilized a canine model with left anterior descending coronary artery occlusion.
  • Measured RMBF and intramyocardial pressure (IMP) in subendocardial and subepicardial layers.
  • Assessed the effects of CSO with intact vasomotor tone and after adenosine administration.

Main Results:

  • CSO significantly increased RMBF in the ischemic region, particularly in the subendocardium.
  • The subendocardial to subepicardial ratio of RMBF (Endo/Epi) was significantly elevated by CSO.
  • These beneficial effects were partially attenuated by adenosine but remained significant.

Conclusions:

  • Coronary sinus occlusion demonstrates potential in enhancing coronary collateral flow.
  • CSO may play a role in preserving ischemic myocardium, with a notable benefit to the subendocardium.

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