Is postconditioning effective in prevention against long-lasting myocardial ischemia in the rabbit?
The goal of the study was to determine whether postconditioning protects against different ischemia durations in the rabbit. Rabbits were assigned to a 20-, 25-, 45- or 60-min coronary occlusion followed by 24-h of reperfusion. Rabbits received no further intervention (control) or were postconditioned with four cycles of 30-s occlusion and 30-s reperfusion after myocardial infarction. Plasma levels of troponin I were quantified throughout reperfusion. In control conditions, infarct sizes (% area at risk using triphenyltetrazolium chloride) after 20, 25, 45 and 60 min of coronary occlusions were 23+/-3, 51+/-4, 70+/-3 and 81+/-3 %, respectively. With 20 and 25 min occlusion, postconditioning reduced infarct size by 43+/-10 and 73+/-21 %, respectively. On the other hand, with 45 or 60 min occlusion, postconditioning had no significant effects on infarct size (61+/-3 and 80+/-2 % of area at risk). Preconditioning protocol was performed with 25- and 60-min coronary occlusion. As expected, preconditioning significantly reduced infarct size. In conclusion, in the rabbit, the cardioprotection afforded by postconditioning is limited to less than 45 min coronary occlusion.
Létienne
R
R
Centre de Recherche Pierre Fabre, 17 Av. Jean Moulin, 81106 Castres, France. robert.letienne@pierre-fabre.com
Calmettes
Y
Y
Le Grand
B
B
D000818:Animals; D006439:Hemodynamics; D019157:Ischemic Preconditioning, Myocardial; D008297:Male; D017202:Myocardial Ischemia / Q000097:blood / Q000473:pathology / Q000517:prevention & control*; D009206:Myocardium / Q000473:pathology; D011817:Rabbits; D019210:Troponin I / Q000097:blood
D019210:Troponin I