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13. Preservation of ischemia and isoflurane-induced preconditioning after brain death in rabbit hearts

Author

Chiari, Pascal, Piriou, Vincent, Hadour, Guylaine, Rodriguez, Claire, Loufouat, Joseph, Lehot, Jean-Jacques, Ovize, Michel, and Ferrera, Rene

Subjects
Catecholamines -- Physiological aspects, Ischemia -- Physiological aspects, Heart muscle -- Physiological aspects, Biological sciences
Abstract

We sought to determine whether brain death-induced catecholamine re]ease preconditions the heart, and if not, whether it precludes further protection by repetitive ischemia or isoflurane. Anesthetized rabbits underwent 30 min of coronary occlusion and 4 h of reperfusion. The effect on infarct size of either no intervention (controls), ischemic preconditioning (IPC), or isoflurane inhalation (Iso) was evaluated with or without previous brain death (BD) induced by subdural balloon inflation. Plasma catecholamine levels were measured at several time points. Although it dramatically increase plasma catecholamine levels, BD failed to reduce infarct size that averaged 0.49 [+ or -] 0.34 without BD versus 0.45 [+ or -] 0.27 g with BD. IPC and Iso, alone as well as after BD, significantly reduced infarct size that averaged 0.11 [+ or -] 0.04, 0.21 [+ or -] 0.15, 0.10 [+ or -] 0.09, and 0.22 [+ or -] 0.10 g in IPC, Iso, BD + IPC, and BD + Iso groups, respectively (means [+ or -] SD, P < 0.05 vs. controls). BD-induced catecholamines 'storm' does not precondition the rabbit heart that however retains the ability to be protected by repetition of brief ischemia or isoflurane inhalation. catecholamines; volatile anesthetics; myocardium

Published
2002

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