All Types of Fever

Definition of fever —

Abnormal elevation of temperature. The normal temperature taken orally ranges from about 97.6° to 99.6°F, although there is some individual variation. Rectal temperature is 0.5° to 1.0°F higher than oral temperature.

normal body temp —

  • fever is controlled by hypothalamus
  • normal core body tmp is 37 C
  • mean oral temp is- 36.8 C
  • mean temp is least at morning 6am
  • maximum at  4 pm

body temperature in fever —

  • morning temp is more then– 37.2C
  • and earning temp  more then–37.7C
  • oral temp is 1F higher then axially temp
  • during menstruation the morning temp in women is lower in 1st 2nd weeks

site of temperature measurement —

  • oral cavity
  • axillary
  • rectum
  • tympanic membrane [radiant heat]
  • average rise of 1F there is increase of 10 beat in pulses

Etiology  of Fever —

  • Elevated temperatures that are caused by inadequate thermoregulatory responses during exercise in very hot weather is called hyperthermia; the set point is not increased.

Relative bradycardia —

Difference between fever, hyperthermia, hyperpyrexia —


  • in fever there is increase in body temperature along with hypothalamic thermo regulatory set point.

Hyperthermia —

  • uncontrolled rise in body temperature but unchanged thermo regulatory set point.

Hyperpyrexia –


Main causes of hyperthermia —

Heat stock —

  • the failure of thermoregulatory mechanism in body can cause the heat stoke. it may be exortional or non exortional.

Patterns of fever —

  • continuous fever–

  • there is continuous fever with the fluctuation of only 1F . temperature never touch normal.
  • remittent fever–

  • there is persistent fever but the fluctuation is more then  1F.
  • Intermittent fever–

  • the temperature of body comes to normal during the certain time of day.
  • Qtidian fever–

  • it is intermittent fever but it occurs daily.
  • Tertian fever–

  • fever occurs 1st day and then 3rd day.
  • Quartan fever–

  • fever ocure 1st day then 4th day.
  • Pel ebstein fever–

  • fever  3- 10 day then no fever next  3- 10 day, like in Hodgkin’s lymphoma.
  • Cyclic neutropeniya–

  • the fever occur every 21 day.

Treatment of fever —

  • the best anti pyretic is paracetamol that can be used.
  • aspirin is not used due to risk of Reye’s syndromes [ in influenza in children age blow 15 y, then there is vomiting, progressive CNS damage, hepatic injury,

Treatment of hyperpyrexia —

  • oral anti pyretic,
  • cooling blanket

Treatment of hyperthermia —

  • sponging
  • fans, cooler, Ac, ice boatel, cooling blanket,
  • IV fluid, gastric and peritoneal lavages  with iced saline, haemodialysis, etc.
  • this is the general information about fever, hope it will help you…

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