What Causes Acute Urticaria?

Discussion Urticaria or hives is a systemic disease with cutaneous results. An agent triggers a histamine reaction with cutaneous pruritic lesions being the result. Urticaria usually has intact, erythematous lesions with a papular component that is usually paler in color. Lesions are of various sizes and wax and wane. The lesions may coalesce and blanch with pressure. Scratches and excoriations may be seen. Bullae can be seen in certain circumstances. Evaluation for systemic reaction is important such as hoarseness, stridor, wheezing, difficulty breathing, arrhythmias, difficulty swallowing or tingling. Acute urticaria is defined as urticaria for less than 6 weeks. Chronic urticaria is defined as wheals that occur at least twice weekly for more than 6 weeks. Because this is a broad definition, some people add that the wheals must be present for more than 1 hour (which distinguishes chronic urticaria from dermatographism) and less than 24-36 hours (which distinguishes it from urticaria-vasculitis). The maintstays of treatment are antihistamines, short-acting ones for acute urticaria and long-acting ones for chronic urticaria. Mastocytosis or angioedema may appear similar to urticaria but are different. Angioedema frequently occurs in mucous membranes and may or may not have urticarial wheals present. Mastocytosis is a heterogeneous group of mast cell disorders which may cause wheal-like lesions on the skin. Learning Point The most common cause of acute urticaria is respirato...
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news

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Source: Drug Development and Industrial Pharmacy - Category: Drugs & Pharmacology Tags: Drug Dev Ind Pharm Source Type: research
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Source: Ocular Immunology and Inflammation - Category: Allergy & Immunology Tags: Ocul Immunol Inflamm Source Type: research
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Source: Ocular Immunology and Inflammation - Category: Allergy & Immunology Tags: Ocul Immunol Inflamm Source Type: research
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