Heat ExhaustionGravity SuitsClothingProtective ClothingOrthopedic EquipmentSkin TemperatureTractionOccipital BoneProtective DevicesSurgical Wound DehiscenceAtrial Function, RightOdontoid ProcessDrowningCerebrospinal Fluid RhinorrheaSternotomyHeat Stress DisordersRadionuclide VentriculographyCervical VertebraeOrthopedic Fixation DevicesBlood CirculationHot TemperatureCardiopulmonary ResuscitationBody TemperatureFeverEnvironmentTreatment OutcomeTime Factors