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BackgroundThis study aimed to evaluate the clinical effectiveness of bilastine in type IIb autoimmune CSU (type IIb aiCSU) patients over an 8-week period, as well as to identify factors predicting treatment response.Method34 type IIb aiCSU patients with positive basophil histamine release assays (BHRA) and positive Autologous Serum Skin Test (ASST) tests, from the Vietnam National Dermatology and Venereology Hospital, were included. Patients began treatment with the standard dose of bilastine, with the dose increased every two weeks for those who did not achieve adequate response. The Urticaria Control Test (UCT), Weekly Urticaria Activity Score (UAS7), and the Chronic Urticaria Quality of Life Questionnaire (CU-Q2oL) were used.ResultsSignificant improvements in all measures were observed, with 82.4% of patients achieving complete response by week 8. Of these, 47.1% responded to the standard dose, while 14.7% did not respond even at the maximum (x4) dose. UAS7 average scores decreased from a baseline mean of 28.9 to 2.9, indicating substantial reduction in disease activity. UCT scores improved from 47.1% of patients having poor disease control (UCT ConclusionThe findings suggest that bilastine is highly effective in controlling aiCSU symptoms and improving QoL.