All episodes of patients with acute UC admitted to Tampere University Hospital and treated with intravenous corticosteroids between January 2007 and January 2016 were identified from patient records and reviewed. The risks for colectomy and for continuous use of corticosteroids were evaluated. Predictive factors were analysed.

Data collected included epidemiological (gender, age at index flare, smoking status), clinical (UC duration, extent of the disease, prior Cs usage, disease severity, laboratory results at index flare) and treatment data (occurrence of new flares, need for further Cs therapy; CyA, thiopurines, biologics or colectomy during follow-up). The diagnosis of UC was made on basis of clinical history, symptoms, endoscopic and histological features. Disease extent was categorized by the Montreal classification and the severity of the flare was assessed by Mayo scoring system based on clinical and endoscopic characteristics. ASUC was characterized by more than six bloody stools/day along with any of the following: tachycardia, elevated temperature, anemia and/or ESR >30 mm/h (Truelove and Witt´s criteria)5. Alleviation of UC was defined as clinical response to intravenous corticosteroids with no need for colectomy or rescue therapy at the same hospitalization as the index flare. Relapse was defined as requiring further corticosteroid treatment, rehospitalization, rescue-therapy, or colectomy later in follow-up.

Inclusion Criteria:

• Acute severe ulcerative colitis treated first time with iv corticosteroids
• Follow-up for at least six months after hospitalization or until colectomy.

Exlusion:

-Under 16 year of age

IBD patients treated in hospital ward with first intravenous corticosteroid