584 Frequency of Autoreactivity Demonstrated by Autologous Serum Skin Test in Patients with Chronic Urticaria in the Valley of Mexico During a Period of 8 Years.

Background Urticaria is a skin disease characterized by rapid emergence of hives, accompanied or not with angioedema. Usually lasts less than 24 hours. Approximately 12 to 24 per cent of the population will have hives or angioedema at least once in their life. Some patients with chronic urticaria has been classified as autoimmune. The autologous serum skin test (ASST) has been used to show pro-inflammatory circulating endogenous factors and it is regarded as a test for autorreactividad. The autorreactividad does not define an autoimmune urticaria, but may be an indicator of the presence of auto- reactive antibodies with the capacity of to activate the mast cells however functional antibodies need to be confirmed through of release of basophils histamine test from basophils (BHRA) and its specificity immunoassay (Western Blot or ELISA)-confirmed. Objective: to evaluate the auto-reactivity by autologous serum skin test in patients with chronic urticaria idiopathic in a study of 8 years. Material and methods: we made 216 ASST and autologous plasma skin test (APST) in patients with chronic urticaria without specific cause identified, of any age, during the period of 2003 to 2011.