HypothermiaBody TemperatureBody Temperature RegulationDrug ToleranceDronabinolCerebral VentriclesHypothermia, InducedCirculatory Arrest, Deep Hypothermia InducedDepression, ChemicalInjectionsHypothalamusDose-Response Relationship, DrugEthanolHeart Arrest, InducedRewarmingCardiopulmonary BypassOrgan PreservationTissue PreservationCold TemperatureOrgan Preservation SolutionsPerfusionCardioplegic SolutionsShiveringOxygenatorsMyxedemaRaffinoseTime FactorsAortic Aneurysm, ThoracicAortic AneurysmAneurysm, DissectingBrainCerebrovascular CirculationHeart ArrestReperfusionBlood Gas AnalysisExtracorporeal CirculationIntraoperative ComplicationsMonitoring, IntraoperativeOxygenCardiac Surgical ProceduresCatalepsy8-Hydroxy-2-(di-n-propylamino)tetralinSwineSkin TemperatureFentanylAorta, ThoracicCardiovascular Surgical Procedures