Fever
Fever
F ever normal body temperature 370. Circadian variation <10 C Definition of fever an elevation of core body temperature above the normal range rectal T0.5> oral T0.5> axillary T(腋温)
Fever •Normal body temperature: 37oC, Circadian variation <1o C •Definition of fever: An elevation of core body temperature above the normal range rectal T 0.5oC > oral T 0. 5oC > axillary T（腋温）
fever Hyperthermia(体温过高) fever due to a disturbance of thermal regulatory control excessive heat production decreased dissipation loss of regulation
Fever •Hyperthermia (体温过高） fever due to a disturbance of thermal regulatory control excessive heat production decreased dissipation loss of regulation
fever Shifting of the Thermoregulatory set-point Maintaining an abnormally elevated Temperature Accelerating energy production T increase 0.6C= bMR increase 10%
Fever •Shifting of the Thermoregulatory set-point •Maintaining an abnormally elevated Temperature •Accelerating energy production T increase 0.6oC = BMR increase 10%
Pathophysiology body temperature is determined by two opposing processes heat production heat loss They are regulated by the central nervous system Energy in the form of heat is generated by living tissues(thermogenesis) Energy may be passively absorbed from the environment and transfer the energy to the surrounding medium
Pathophysiology •Body temperature is determined by two opposing processes heat production heat loss • They are regulated by the central nervous system • Energy in the form of heat is generated by living tissues (thermogenesis) • Energy may be passively absorbed from the environment and transfer the energy to the surrounding medium