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Perfusion-induced changes in cardiac contractility depend on capillary perfusion

M A Dijkman1, J W Heslinga, P Sipkema

  • 1Laboratory for Physiology, Vrije Universiteit Amsterdam, The Netherlands.

The American Journal of Physiology
|March 5, 1998
PubMed
Summary

The Gregg phenomenon, an increase in cardiac contractility due to perfusion, is linked to capillary perfusion. Blocking capillary flow in rat papillary muscles abolished this contractility response.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Muscle Mechanics

Background:

  • The Gregg phenomenon describes increased cardiac contractility with perfusion, often observed in preparations lacking coronary autoregulation.
  • Inadequate autoregulation can lead to unprotected changes in capillary pressure, potentially influencing contractility.

Purpose of the Study:

  • To investigate the relationship between cardiac muscle contractility and capillary perfusion.
  • To determine if capillary perfusion is a necessary component of the Gregg phenomenon.

Main Methods:

  • Isolated perfused rat papillary muscles were used, contracting isometrically at 27°C.
  • Perfusion pressure was increased stepwise, and active tension was measured.
  • Capillary perfusion was obstructed using 15-micron plastic microspheres to assess functional changes.

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Main Results:

  • Increased perfusion pressure significantly increased active tension in control muscles, accompanied by increased muscle diameter.
  • Obstructing capillary perfusion drastically reduced flow but did not significantly alter active tension in unperfused conditions.
  • Following microsphere obstruction, elevated perfusion pressures failed to increase active tension and even caused a decrease.

Conclusions:

  • The Gregg phenomenon is directly related to capillary perfusion.
  • Adequate capillary perfusion is essential for the observed increase in cardiac contractility under elevated perfusion pressures.