Hypoxia-Ischemia, BrainAnoxiaAnimals, NewbornHypoxia, BrainIschemiaPlethysmography, Whole BodyBrain IschemiaCell HypoxiaPia MaterHypercapniaNeuroprotective AgentsRats, Sprague-DawleyHypotensionMyocardial IschemiaCerebrovascular CirculationBrainDisease Models, AnimalCell DeathRats, WistarCerebral ArteriesNeuronsReperfusion InjuryCerebral InfarctionOxygenFetal HypoxiaIschemic Attack, TransientInfarction, Middle Cerebral ArteryMyocardial Reperfusion InjuryHypoxia-Inducible Factor 1, alpha SubunitReperfusionMiddle Cerebral Artery