RT Book, Section A1 Collo Go, Ronaldo A2 Go, Ronaldo Collo SR Print(0) ID 1160188176 T1 Hypothermia and Hyperthermia T2 Critical Care Examination and Board Review YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781259834356 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1160188176 RD 2024/03/29 AB Normal body temperature changes during the course of the day and is regulated by the thermoregulatory center in the anterior hypothalamus. The normal temperature at 6 AM is 37.2°C and at 4 PM is 37.7°C. Rectal temperatures are normally higher than oral temperatures because of mouth breathing. To obtain core temperature, readings should be obtained in the esophagus or tympanic membrane. During a fever, the setpoint in the hypothalamus is shifted upward. During hyperthermia, the setpoint is unchanged, but the rest of the body overcompensates to remove heat. At the other end of the spectrum, hypothermia is defined as core temperature less than 35°C. This chapter discusses the therapeutic and pathologic implications of hypothermia and hyperthermia.