- Chills
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Rigor ICD-10 R50.0 ICD-9 780.64 MeSH D023341 For the New Zealand rock band, see The Chills.Rigor is a shaking occurring during a high fever. It occurs because cytokines and prostaglandins are released as part of an immune response and increase the set point for body temperature in the hypothalamus.
It is sometimes considered a synonym for "chills".[1]
Contents
Physiology
The increased set point causes the body temperature to rise (pyrexia), but also makes the patient feel cold until the new set point is reached. Rigor occurs because the patient's body is effectively shivering in a physiological attempt to increase body temperature to the new set point.
Causes
Rigors are commonly caused by:
- Influenza
- Tonsillitis
- Infectious Pneumonia
- Biliary sepsis (part of Charcot's triad 2)
- Pyelonephritis
- Visceral abscess (including lung, liver and paracolic)
- Malaria
- A side effect of treatment with amphotericin B
- General Illnesses
See also
References
Symptoms and signs: general / constitutional (R50–R61, 780.6–780.9) Temperature heat: Fever (Fever of unknown origin, Drug-induced fever, Postoperative fever) • Hyperhidrosis (e.g., Sleep Hyperhidrosis; "Sweating") • Hyperpyrexia • Hyperthermiacold: ChillsAches/Pains Malaise and fatigue Atrophy (e.g., Muscle Atrophy) • Debility (or Asthenia) • Lassitude • Lethargy • Muscle tremors • TendernessMiscellaneous Flu-Like SymptomsCategories:- Symptoms and signs: General
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