Hypothermia, InducedCirculatory Arrest, Deep Hypothermia InducedHypothermiaRewarmingHeart Arrest, InducedCardiopulmonary BypassPerfusionExtracorporeal CirculationBody TemperaturePerioperative PeriodAorta, ThoracicAortic Aneurysm, ThoracicBlood Coagulation DisordersAortic AneurysmAneurysm, DissectingHypoxia-Ischemia, BrainPerfusion ImagingHeart ArrestTime FactorsBody Temperature RegulationTreatment OutcomeMyocardial Perfusion ImagingAsphyxia NeonatorumCardiopulmonary ResuscitationShiveringRetrospective StudiesCold TemperatureComaCerebrovascular CirculationBrainBrain InjuriesBrain IschemiaTomography, Emission-Computed, Single-PhotonCoronary CirculationRats, Sprague-DawleyHypoxia, BrainResuscitationHeatingOut-of-Hospital Cardiac ArrestChemotherapy, Cancer, Regional PerfusionDisease Models, AnimalIntracranial PressureAsphyxiaSkin TemperatureLaser-Doppler FlowmetryRats, WistarHyperthermia, InducedRegional Blood FlowIntraoperative ComplicationsDeep Brain StimulationElectroencephalographyInfant, NewbornDogsSwineMicrocirculation