Preconditioning in Intact and Previously Diseased Myocardium: Laboratory or Clinical Dilemma?

Bela Juhasz, Peter Der, Tibor Turoczi, Ildiko Bacskay, Edit Varga, Arpad Tosaki

Research output: Contribution to journalReview article

27 Citations (Scopus)

Abstract

We studied the effects of various cycles of preconditioning (PC) (one cycle, 1 × PC; two cycles, 2 × PC; three cycles, 3 × PC; and four cycles, 4 × PC) on cardiac function, infarct size, and the incidence of reperfusion-induced arrhythmias in isolated hearts obtained from rabbits with hypercholesterolemia. After 8 weeks of hypercholesterolemia, hearts were subjected to 30 min of ischemia followed by 120 min of reperfusion. Various cycles of PC resulted in a "cycle-dependent" reduction in infarct size in the age-matched nonhypercholesterolemic group. In the 8-week hypercholesterolemic group, increasing cycles of PC resulted in a significant increase in infarct size from their nonpreconditioned ischemic/reperfused control value of 44 ± 5% to 45 ± 6%, 49 ± 5%, 59 ± 6% (p < 0.05), and 58 ± 5% (p < 0.05), respectively. PC increased the vulnerability of the myocardium to reperfusion-induced arrhythmias in hypercholesterolemics indicating that PC may be an "intact heart" phenomenon. The effects of PC appear currently to be a dilemma in laboratories and clinics. The solution to the problem of PC in intact and diseased myocardium requires further data from two different sources: (a) previously "diseased" animals, and (b) diseased human myocardium from clinics. Once these data are available, then the effects under which PC will be beneficial rather than harmful could be established and the dilemma solved.

Original languageEnglish
Pages (from-to)325-333
Number of pages9
JournalAntioxidants and Redox Signaling
Volume6
Issue number2
DOIs
Publication statusPublished - Apr 1 2004

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology
  • Clinical Biochemistry
  • Cell Biology

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