Clinico‑Epidemiologic Profile and Response to Levocetirizine in Chronic Spontaneous Urticaria: A Retrospective Cohort Study from a Tertiary Care Center in North India.

Background: Comprehensive long‑term follow‑up data regarding chronic spontaneous urticaria (CSU) among general populations, especially from the Indian subcontinent is scanty. Aim and Objectives: The aim of the study were to analyze the clinico‑epidemiological profile, comorbidities of CSU patients, and factors affecting patient response to various doses of levocetirizine. Materials and Methods: In this retrospective cohort study, complete history regarding demographic profile, clinical examination, investigations, treatment given, and follow‑up details of all CSU patients attending urticaria clinic between 2010 and 2019 were analyzed. These were considered variables to determine the factors playing a role in response to various doses of levocetirizine. Results: Totally, 1104 files of CSU were analyzed. The male‑to‑female ratio was 1:1.5 with a mean age of 33.03 ± 14.33 years. Thyroid dysfunction and atopy were seen in 142 (12.8%) and 184 (16.7%) patients, respectively. Vitamin D deficiency and high serum immunoglobulin E (IgE) levels were seen in 461 (41.7%) and 340 (30.7%) patients, respectively. Immunosuppressives were required at some point in 196 (17.7%) patients. Patients with higher levels of serum IgE and D‑dimer (P < 0.05) were found to require frequent updosing of levocetirizine, while age, sex, duration of illness, presence of angioedema, co‑morbidities, identifiable precipitating factors, presence of diurnal variation, family history, and vitamin D deficiency were found to not have an effect on levocetirizine dosing. Conclusion: Ours is a large single‑center study exemplifying the biomarkers including baseline serum IgE and D‑dimer levels, which could identify a CSU patient who could warrant a higher dose of antihistamine/antihistamine refractory urticaria. [ABSTRACT FROM AUTHOR]