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urticaria

urticaria is a topic covered in the Taber's Medical Dictionary.

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(ŭrt″ĭ-kar′ē-ă)

[L. urtica, nettle]
An allergic reaction marked by multiple discrete swellings on the skin (wheals) that are intensely itchy and last up to 24 hr. The wheals appear primarily on the chest, back, extremities, face, or scalp.
SYN: SEE: hives


URTICARIA ; SEE: allergy; SEE: angioedema

ETIOLOGY
Urticaria is caused by vasodilation and increased permeability of capillaries of the skin due to the release by mast cells of vasoactive mediators. The mast cell degranulation is due to an immunoglobulin E-mediated reaction to allergens (such as foods, drugs, or drug additives), heat, cold, and, rarely, infections or emotions. Urticaria is a primary sign of local and systemic anaphylactic reactions. It affects people of all ages but is most common between the ages of 20 and 40. Angioedema is frequently associated with urticaria.

TREATMENT
Drugs that block histamine-1 (H1) receptors (antihistamines) are the primary treatment for urticaria. The use of both H1 and H2 receptor blockers has been recommended but has not been proven more effective. Patients should avoid identified allergens. Doxepin, calcium channel blockers, or immunosuppresive drugs may be needed for symptoms that are not well controlled with antihistamines. Known triggers of urticaria should be avoided.




URTICARIA

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Citation

Venes, Donald, editor. "Urticaria." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Taber's Online, www.tabers.com/tabersonline/view/Tabers-Dictionary/771143/all/urticaria.
Urticaria. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://www.tabers.com/tabersonline/view/Tabers-Dictionary/771143/all/urticaria. Accessed May 21, 2019.
Urticaria. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://www.tabers.com/tabersonline/view/Tabers-Dictionary/771143/all/urticaria
Urticaria [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2019 May 21]. Available from: https://www.tabers.com/tabersonline/view/Tabers-Dictionary/771143/all/urticaria.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - urticaria ID - 771143 ED - Venes,Donald, BT - Taber's Medical Dictionary UR - https://www.tabers.com/tabersonline/view/Tabers-Dictionary/771143/all/urticaria PB - F.A. Davis Company ET - 23 DB - Taber's Online DP - Unbound Medicine ER -