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High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
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Heterogeneity of myocardial blood flow

J I Hoffman1

  • 1University of California San Francisco 94143, USA.

Basic Research in Cardiology
|March 1, 1995
PubMed

Insights

Myocardial blood flow shows significant variability across heart chambers, walls, and microregions. This heterogeneity, especially in layers, may explain common heart conditions like subendocardial ischemia and patchy necrosis in chronic ischemia.

Area of Science:

  • Cardiovascular Physiology
  • Cardiac Imaging
  • Myocardial Perfusion

Background:

  • Myocardial blood flow is not uniform, varying by heart chamber, ventricular wall layers, and microregions.
  • Myocardial flow reserve also demonstrates variability, even in a non-beating heart, particularly within layers and microregions.

Purpose of the Study:

  • To investigate the heterogeneity of myocardial blood flow and its implications for cardiac health.
  • To explore the relationship between blood flow variability and conditions like ischemia and necrosis.

Main Methods:

  • Analysis of myocardial blood flow distribution across different cardiac structures.
  • Assessment of myocardial flow reserve variability under various conditions, including cardiac arrest.

Main Results:

  • Significant heterogeneity in myocardial blood flow was observed across chambers, layers, and microregions.
  • Variability in myocardial flow reserve was noted, even during cardiac arrest, suggesting regional resistance differences.
  • In the beating heart, flow variability is likely linked to regional differences in workload and oxygen demand.

Conclusions:

  • Layer-specific heterogeneity in myocardial blood flow may underlie subendocardial ischemia prevalent in heart disease.
  • Microheterogeneity of blood flow could explain the patchy necrosis observed in chronic ischemic conditions.

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