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Abstract
Chronic Spontaneous Urticaria, often characterized by pruritic hives, can significantly impact quality of life [1][4]. Standard treatment involves second-generation antihistamines, but some cases may become refractory, requiring stronger medications such as cyclosporine A [2]. Purpose: To investigate the association of allergic conjunctivitis alongside CSU and use of cyclosporine A compared to those without pre-existing AC in treating CSU, using TrinetX database. Methods: Analysis included ICD-10 codes ‘urticaria, unspecified, ‘idiopathic urticaria,’ or ‘other urticaria’ for patients seen during 2020-2024, with at least two consecutive visits at least 4-6 weeks apart, in addition to receiving a second-generation H1-antihistamine treatment. Compare prevalence of cyclosporine use between two cohorts: AC (+) x urticaria x pretreated with H1 and AC (-) x urticaria x pretreated with H1 and patients with and without AC, requiring the addition of cyclosporine A to H1 for treatment of CSU over an observation period of 5 years. Propensity score matching to pair the two cohorts for age, sex, and race [3]. Results: In AC (+) x urticaria x pretreated with H1 group, there were 38,530 patients, out of which 446 required the addition of cyclosporine treatment, resulting in a risk percentage of 1.158%. In AC (-) x urticaria x pretreated with second-generation antihistamine group, with 415,786 patients, 2,812 required the addition of cyclosporine treatment, resulting in a lower risk percentage of 0.676%. Risk Ratio (RR) is calculated as 1.711, with a 95% confidence interval of (1.55, 1.89). Conclusion: A greater proportion of CSU patients with AC required cyclosporine compared to those without AC.