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Related Experiment Videos

Coronary sinus occlusion: effect on ischemic left ventricular dysfunction and reactive hyperemia.

A K Jacobs1, D P Faxon, W D Coats

  • 1Evans Memorial Department of Clinical Research, University Hospital, Boston, MA 02118.

American Heart Journal
|February 1, 1991
PubMed
Summary

Pressure-controlled intermittent coronary sinus occlusion (PICSO) did not improve left ventricular function during brief ischemia. PICSO blunted reactive hyperemia, likely due to mechanical venous engorgement, not reduced ischemic stimulus.

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Area of Science:

  • Cardiovascular Physiology
  • Ischemic Heart Disease Research

Background:

  • Pressure-controlled intermittent coronary sinus occlusion (PICSO) is a technique explored for reducing infarct size.
  • The impact of PICSO on left ventricular function following brief ischemia requires further investigation.

Purpose of the Study:

  • To evaluate the efficacy of PICSO in mitigating left ventricular dysfunction caused by short-term ischemia.
  • To determine the effect of PICSO on reactive hyperemia during reperfusion.

Main Methods:

  • Nine open-chest anesthetized dogs underwent 3-minute left anterior descending artery (LAD) occlusion with and without PICSO.
  • Regional left ventricular function was assessed using sonomicrometry.
  • Coronary blood flow was measured, and experiments were repeated with adenosine infusion to induce maximal vasodilation.

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Main Results:

  • PICSO did not prevent, reduce, or shorten ischemic left ventricular dysfunction.
  • PICSO uniformly blunted reactive hyperemia during reperfusion.
  • PICSO reduced coronary blood flow even during adenosine-induced maximal vasodilation.

Conclusions:

  • PICSO does not appear to protect against brief ischemic left ventricular dysfunction.
  • The blunting of reactive hyperemia by PICSO is likely attributed to mechanical venous engorgement.
  • Further research is needed to understand the mechanical effects of PICSO on coronary hemodynamics.