Hypothermia, InducedOut-of-Hospital Cardiac ArrestHeart ArrestCardiopulmonary ResuscitationHypothermiaHypoxia-Ischemia, BrainRewarmingAsphyxia NeonatorumBody TemperatureComaResuscitationBrain InjuriesTreatment OutcomeShiveringEmergency Medical ServicesVentricular FibrillationInfant, NewbornBody Temperature RegulationDrowningTime FactorsMyocytes, CardiacIntensive Care Units, PediatricElectroencephalographyIntensive CareCritical CareIntracranial PressureNervous System DiseasesBrain DiseasesHospitals, PediatricNeurologic ExaminationRetrospective StudiesCA1 Region, HippocampalCardiac OutputMonitoring, PhysiologicClinical ProtocolsSeizuresFeasibility StudiesDisease Models, AnimalProspective StudiesHeartBrain