Hypothermia, InducedHypothermiaRewarmingSeverity of Illness IndexBody TemperatureTreatment OutcomeHypoxia-Ischemia, BrainIntracranial HypertensionProspective StudiesCardiopulmonary BypassIntracranial PressureCardiovascular Surgical ProceduresHeart ArrestReperfusionCerebrovascular CirculationConstrictionAcid-Base EquilibriumNervous System DiseasesBrainCerebral InfarctionTime FactorsFeasibility StudiesBrain IschemiaPerfusionRats, Sprague-DawleyBody Temperature RegulationCirculatory Arrest, Deep Hypothermia InducedAsphyxia NeonatorumShiveringCardiopulmonary Resuscitation