Efficacy of High-Dose Methylprednisolone in Inducing Remission in Pediatric Acute Severe Ulcerative Colitis: Retrospective Study.

: Ulcerative colitis (UC) is increasing in incidence, including among pediatric populations. Treatment aims primarily to induce and maintain remission. For those inadequately responding to 5-aminosalicylic acid, remission may be induced via oral steroids or, in severe instances, intravenous methylprednisolone. This retrospective case series aims to evaluate the efficacy of high-dose intravenous methylprednisolone pulses (30 mg/kg, max 1 g per day for 3-5 days) in inducing remission in moderate and severe pediatric UC cases. : From a cohort of pediatric patients (<18 years) hospitalized in 2018-2021 due to an acute flare of UC, those treated with high doses of methylprednisolone to induce remission were identified. The Pediatric Ulcerative Colitis Activity Index (PUCAI) was used to determine the response to treatment, considering a 20-point reduction or a score below 10 as significant improvement and indicative of remission induction. : Disease activity was severe in most patients (12/15), with 3/15 having moderate but refractory disease. We observed a clinically significant response in 9/15 patients (60%) with a mean PUCAI decrease of 39.4 ± 14.7 points. The median duration to clinical remission was 4 (IQR 3-4) days. For the 6/15 non-responders to methylprednisolone pulses, treatment was escalated. Adverse effects were not observed during the treatment period. : High-dose methylprednisolone may be a viable alternative for inducing remission in pediatric UC. However, the small sample size and retrospective design warrant further prospective studies to validate these findings.