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Related Experiment Videos

Adenosine and the stunned heart

M P Randhawa1, R D Lasley, R M Mentzer

  • 1Division of Cardiothoracic Surgery, University of Wisconsin Hospitals, Madison 53792.

Journal of Cardiac Surgery
|March 1, 1993
PubMed
Summary

Adenosine protects the heart from stunning by activating A1 receptors. This study confirms adenosine

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Area of Science:

  • Cardiovascular Physiology
  • Pharmacology

Background:

  • Myocardial stunning is a significant concern following ischemia-reperfusion injury.
  • Adenosine, acting via A1 and A2 receptors, influences cardiovascular function.
  • Previous research suggests adenosine's cardioprotective potential.

Purpose of the Study:

  • To investigate the role of adenosine A1 receptor-mediated mechanisms in protecting stunned myocardium.
  • To evaluate the effects of exogenous adenosine on postischemic cardiac function.

Main Methods:

  • Studies utilized isolated rat hearts and a canine model of myocardial ischemia-reperfusion.
  • Adenosine A1 and A2 receptor agonists and antagonists were employed.
  • Interstitial fluid adenosine levels were modulated using an adenosine deaminase inhibitor (EHNA).
  • Postischemic recovery of systolic wall thickness was measured in dogs receiving intracoronary adenosine.

Main Results:

  • Adenosine and the A1 agonist R-phenylisopropyladenosine (PIA) prolonged the time to ischemic contracture in rat hearts.
  • The A2 agonist phenylaminoadenosine had no effect.
  • Receptor antagonists blocked the actions of adenosine and PIA.
  • EHNA administration increased interstitial adenosine levels and improved postischemic function in dogs.
  • Exogenous intracoronary adenosine significantly enhanced systolic wall thickness recovery in canine hearts (p < 0.01).

Conclusions:

  • Adenosine exerts a protective effect against myocardial stunning.
  • These findings strongly support an adenosine A1 receptor-mediated mechanism for cardiac protection in stunned myocardium.

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