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Is stunning an important component of preconditioning?

A Cargnoni1, C Ceconi, P Bernocchi

  • 1Salvatore Maugeri Foundation, IRCCS, Cardiovascular Pathophysiology Research Center, Gussago, Brescia, Italy.

Journal of Molecular and Cellular Cardiology
|December 1, 1996
PubMed
Summary

Myocardial stunning after brief ischemia enhances cardioprotection during preconditioning. This cardiac protection involves ATP sparing, crucial for preserving heart function during ischemic events.

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Area of Science:

  • Cardiovascular Physiology
  • Cellular Biology

Background:

  • Ischemic preconditioning (IP) is a phenomenon where brief periods of ischemia protect the heart against subsequent longer ischemic insults.
  • The precise mechanisms underlying IP-mediated cardioprotection, particularly the role of stunning, remain incompletely understood.

Purpose of the Study:

  • To investigate whether myocardial stunning following a brief ischemic period is a key component of cardioprotection induced by preconditioning.
  • To elucidate the relationship between stunning, energetic metabolism, and functional recovery in an in vitro model of cardiac ischemia.

Main Methods:

  • Isolated Langendorff-perfused rat hearts were subjected to aerobic perfusion followed by either control conditions or two cycles of 2-minute ischemia/reperfusion (preconditioning).
  • Two preconditioning protocols were compared: one with a 5-minute reperfusion interval (group 3) and another with a 20-minute reperfusion interval (group 4) before a severe ischemic insult.

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  • Mechanical function, high-energy phosphate content (creatine phosphate and ATP), and creatine kinase release were monitored throughout the experiment.

    • Main Results:

    • Preconditioning with a 5-minute reperfusion interval (group 3), which induced myocardial stunning, resulted in significantly improved recovery of systolic pressure and reduced diastolic pressure rise compared to controls.
    • Group 3 hearts exhibited reduced creatine kinase release and higher levels of high-energy phosphates (creatine phosphate and ATP) at the end of ischemia and after reperfusion.
    • Preconditioning with a 20-minute reperfusion interval (group 4), allowing full recovery of mechanical function and preventing stunning, failed to provide cardioprotection.

    Conclusions:

    • Myocardial stunning, characterized by a decrease in mechanical function after a brief ischemic episode, plays a significant role in preconditioning-induced cardioprotection.
    • This stunning appears to facilitate ATP sparing, contributing to the preservation of cardiac energy reserves and improved outcomes during subsequent severe ischemia.
    • The findings suggest that stunning is not merely a detrimental effect but an integral part of the protective adaptation elicited by ischemic preconditioning in vitro.