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Intimal injury in a transiently occluded coronary artery increases myocardial necrosis. Effect of aspirin

  • Original Article
  • Heart, Circulation, Respiration and Blood; Environmental and Exercise Physiology
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Abstract

This study tested the hypothesis that intimal injury in a transiently occluded coronary artery limits myocardial salvage. The effect of intimal injury on reactive hyperaemia was investigated in 17 pigs submitted to a 30-min occlusion of the left anterior descending coronary artery (LAD), not resulting in myocardial infarction. Catheter-induced intimal damage increased local platelet deposition (99mTc) and reduced hyperaemia, but did not modify myocardial platelet or polymorphonuclear leucocyte content (myeloperoxidase activity) after 6 h reperfusion. To investigate the influence of intimal injury on the extent of myocardial necrosis secondary to a more prolonged coronary occlusion, and the role of platelets on this influence, 52 pigs were submitted to a double randomization (2×2 factorial design) to 250 mg i.v. aspirin vs. placebo and to coronary intimal injury vs. no coronary damage before a 48-min occlusion of the LAD and 6 h of reperfusion. After excluding 12 animals with reocclusion, coronary intimal injury was associated with larger infarcts (triphenyltetrazolium reaction) in animals receiving placebo (36.2±7.0% of the area at risk in animals with intimal injury vs. 10.8±3.9% in animals without coronary injury, P=0.006) but not in those receiving aspirin (20.3±6.5 vs. 21.7±6.5% of the area at risk in animals with and without intimal injury respectively). These results suggest that coronary intimai injury in the reperfused artery may have adverse effects on myocardial salvage by mechanisms other than reocclusion or embolization of platelet aggregates.

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Barrabés, J.A., Garcia-Dorado, D., Oliveras, J. et al. Intimal injury in a transiently occluded coronary artery increases myocardial necrosis. Effect of aspirin. Pflügers Arch. 432, 663–670 (1996). https://doi.org/10.1007/s004240050183

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  • DOI: https://doi.org/10.1007/s004240050183

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