Abstract Background Epidemiological data suggests greater risk of inflammatory bowel disease in first- and second-generation migrants from a low to high prevalence country, with risk of ulcerative colitis (UC) preceding Crohn’s disease. Little is known about the effect of this on hospitalisations for UC, including acute severe ulcerative colitis (ASUC). This study evaluated demographic trends of ASUC admissions in a metropolitan healthcare setting with an expanding culturally and linguistically diverse (CALD) population, with admission outcomes compared. Methods Demographic and disease characteristics of patients admitted with ASUC at a single tertiary metropolitan centre from January 2016 to October 2024 were recorded. Trends in presentation and outcomes in ASUC patients of European Caucasian and non-European background were compared. Results During this 9-year period, 210 patients (88 [41.9%] female, median age 34.5 [16-90] years) had a total of 261 admissions. The ethnicity of patients for UC admissions was 50.9% European Caucasian, 16.2% South Asian, and 13.8% Middle Eastern; ethnicity information was not available for 11% of patients. Of index admissions, 150 (71.4%) met Truelove and Witts criteria for ASUC (62 [41.3%] female, median age 33.5 [16-87] years); 51.3% European Caucasian, 16% South Asian, and 12% Middle Eastern; ethnicity information was not available for 12% of patients. For patients with recorded ethnicity, when comparing all UC admissions in 2016-2019 to 2020-2024, there was a significant increase in the proportion of non-European background patients, increasing from 32.1% to 47.3% (p=0.05), and an increasing trend in ASUC admissions from 29.0% to 46.8% (p=0.08). Median length of stay was 6 days (IQR 5-11) in European Caucasian patients and 6 days (IQR 4-7) in non-European background patients (p=0.11). 12-month steroid dosage was similar in both European Caucasian (median 1685mg) and non-European (median 1612.5mg) patients (p=0.45). 12-month readmission rate was significantly less in the non-European background ASUC population (10.0%) when compared with the European Caucasian population (30.1%), p = 0.02. 7.1% patients of European Caucasian background required inpatient colectomy, compared with 7.5% of non- European background (p=0.94). Conclusion There was an increase in proportion of patients of non-European background hospitalised with UC, including ASUC. In ASUC patients, 12 month-steroid usage, colectomy rates, and length of stay of index admission were similar across ethnicities, but patients of non-European background had lower readmission rates. Further studies are required for improved planning of healthcare resources and assessment of ASUC in CALD populations.
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