Ischemic PostconditioningMyocardial Reperfusion InjuryIschemic PreconditioningHormesisIschemic Preconditioning, MyocardialReperfusion InjuryClaudin-5Myocardial ReperfusionCardiotonic AgentsMyocardial InfarctionTetralogy of FallotRats, Sprague-DawleyMalondialdehydeMyocardiumBrain IschemiaDisease Models, AnimalProto-Oncogene Proteins c-aktRats, WistarSignal TransductionTime Factors