# Outcomes of patients admitted with acute, severe ulcerative colitis on biologic therapy: a retrospective analysis from a tertiary referral hospital

## TL;DR

This study compares outcomes of patients with severe ulcerative colitis who were on biologic therapy versus those who were not, finding no major differences in hospital stay or surgery rates, but higher readmission rates in those on biologic therapy.

## Contribution

The study provides new insights into the management of acute, severe ulcerative colitis in patients already on biologic or small molecule therapy.

## Key findings

- Patients on biologic therapy had similar hospital length of stay and colectomy rates as those not on therapy.
- Patients on biologic therapy had higher rates of surgical consultation and 90-day readmission.
- No significant differences were found in most outcomes between the two groups.

## Abstract

In steroid-refractory acute, severe, ulcerative colitis (ASUC), salvage medical therapy with infliximab is recommended to reduce the risk of colectomy. However, the evidence supporting this practice is based on cohorts naïve to biologics. Consequently, the management of patients on biologic or small molecule therapy (BST) with ASUC is not well defined.

We conducted a retrospective chart review of patients admitted with ASUC to Mount Sinai Hospital (MSH) in Toronto, Ontario from January 2018 until January 2022. Included subjects were considered to be on BST if they had received a dose of these agents within 56 days prior to admission. Our outcomes of interest included the mean difference in hospital length of stay (HLOS), rates of surgical consultation, rates of inpatient colectomies, and 90-day readmission rates between the 2 groups.

Of the 185 admissions for ASUC, 76 were on BST prior to admission and 109 were not. Baseline characteristics were similar between the 2 groups. There were no significant differences in hospital length of stay (7.46 days vs 7.45 days P = .52) or in-hospital colectomy rates between the 2 groups. Patients on BST had higher rates of surgical consultation (36.8% vs 8.3% P < .01) and 90-day readmission rates (26.3% vs 13.8% P = .03).

We did not identify significant differences in the majority of our outcomes between the 2 groups. However, patients on BST were more likely to receive a surgical consultation during their admission and had higher rates of readmission at 90 days. Further studies evaluating the underlying factors that contribute to readmission in patients on BST in hospitals are needed.