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Oxygen free radicals decrease survival time of isolated rat hearts.

A G Semb1, J Vaage, J W Laumann

  • 1Institute for Experimental Medical Research, University of Oslo, Norway.

Scandinavian Journal of Thoracic and Cardiovascular Surgery
|January 1, 1989
PubMed
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Oxygen free radicals (OFR) generated in the heart significantly reduce cardiac survival time. However, allopurinol, an OFR inhibitor, effectively protects heart function, preventing cardiac arrest.

Area of Science:

  • Cardiovascular Physiology
  • Biochemistry
  • Free Radical Biology

Background:

  • Oxygen free radicals (OFR) are implicated in cardiovascular dysfunction.
  • Enzymatic generation of OFR can occur within the coronary circulation.

Purpose of the Study:

  • To investigate the effects of enzymatically generated OFR on isolated rat heart function and survival.
  • To determine the protective effects of allopurinol against OFR-induced cardiac damage.

Main Methods:

  • Isolated rat hearts were retrogradely perfused with Krebs-Ringer solution.
  • Oxygen free radicals were generated using xanthine oxidase (XOD) and hypoxanthine (HX).
  • Cardiac survival time, coronary flow, heart rate, and aortic pulse pressure were measured.

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Main Results:

  • Generation of OFR significantly reduced cardiac survival time (31 min) compared to controls (5 hours).
  • Xanthine oxidase or hypoxanthine alone also decreased survival time.
  • Allopurinol administration prevented the reduction in survival time, restoring it to control levels.
  • OFR reduced aortic pulse pressure but did not affect coronary flow or heart rate.

Conclusions:

  • Enzymatically generated oxygen free radicals impair cardiac function and lead to cardiac arrest.
  • Allopurinol demonstrates significant cardioprotective effects against OFR-induced injury.
  • Targeting OFR production may be a viable therapeutic strategy for cardiovascular protection.