Chronic respiratory disease

March 2010

Clinical

Chronic urticaria

Assessment and treatment

Volume 39, No.3, March 2010 Pages 135-138

Suran Fernando

Andrew Broadfoot

Background

Chronic urticaria is a common condition encountered in general practice and a frequent source of referral to the clinical immunologist, allergist and dermatologist.

Objective

This article discusses the assessment and management of chronic urticaria in the general practice setting.

Discussion

Chronic urticaria is defined as the occurrence of transient wheals lasting more than 6 weeks in duration. In 80% of cases, a cause is not identified and this is classified as chronic idiopathic urticaria. A physical trigger, vasculitis or systemic disease account for a smaller proportion of cases. Allergic causes are rarely responsible. A detailed history provides the most useful information in determining the presence of chronic urticaria and a possible aetiology. Apart from thyroid function tests and thyroid autoantibodies, other investigations should only be performed if clinically indicated. Second generation antihistamines are the mainstay of treatment and usually twice daily regimens are required for adequate control. H2 antagonists, doxepin and immunomodulation may be necessary in some patients.

Urticaria is characterised by the rapid appearance of transient, pruritic skin swellings (wheals) of variable size surrounded by reflex erythema lasting less than 24 hours and leaving no residual skin changes (Figure 1). Urticaria is a common condition, affecting up to 20% of the population.1 It is broadly classified into acute and chronic forms. Acute urticaria is defined as episodes of less than 6 weeks duration and accounts for over two-thirds of cases. An allergic or infectious trigger is sometimes identified (Table 1). Chronic urticaria (CU) is defined as episodes extending beyond 6 weeks and accounts for 30% of cases.

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Correspondence afp@racgp.org.au

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Type

Clinical