Hypoxia-Ischemia, BrainAnoxiaAnimals, NewbornPlethysmography, Whole BodyHypoxia, BrainReperfusion InjuryIschemiaRats, Sprague-DawleyBrain IschemiaReperfusionMyocardial Reperfusion InjuryCell HypoxiaMyocardial ReperfusionPia MaterMyocardial IschemiaHypercapniaNeuroprotective AgentsHypotensionBrainRats, WistarDisease Models, AnimalCerebrovascular CirculationCell DeathNeuronsMyocardiumIschemic PreconditioningIschemic Preconditioning, MyocardialTime FactorsMyocardial Infarction