In ASUC with high stool frequency but no systemic toxicity, is immediate subtotal colectomy or awaiting response to rescue therapy preferred

What is known

- Rescue therapy with infliximab or ciclosporin should be started if there is insufficient response by day 3, and colectomy considered if no response to 7 days of rescue therapy or earlier if deterioration. ¹ - Guidelines recommend subtotal colectomy with ileostomy and rectal preservation for patients not responding within 7 days of rescue therapy, or earlier for deterioration or complications. ² - Direct referral for colectomy before rescue therapy can be considered in patients previously proven refractory to thiopurine or anti-TNF therapy. ³ - Delayed referral and prolonged hospitalization before surgery are associated with increased postoperative complications and mortality. ^3,4

What is unknown / caveats

- Excerpts do not define a stool-frequency threshold that alone mandates immediate surgery absent toxicity - Underlying guideline evidence is graded very low quality - The excerpts describe general timing thresholds but do not resolve the exact decision for a patient with isolated high stool frequency and no systemic toxicity.

## References

1. Chen JH, Andrews JM, Kariyawasam V, Moran N, Gounder P, Collins G, Walsh AJ, Connor S, Lee TW, Koh CE, Chang J, Paramsothy S, Tattersall S, Lemberg DA, Radford-Smith G, Lawrance IC, McLachlan A, Moore GT, Corte C, Katelaris P, Leong RW. Review article: acute severe ulcerative colitis - evidence-based consensus statements. Aliment Pharmacol Ther. 2016;44:127-44. PMID: 27226344.

2. Lamb CA, Kennedy NA, Raine T, Hendy PA, Smith PJ, Limdi JK, Hayee B, Lomer MCE, Parkes GC, Selinger C, Barrett KJ, Davies RJ, Bennett C, Gittens S, Dunlop MG, Faiz O, Fraser A, Garrick V, Johnston PD, Parkes M, Sanderson J, Terry H, Gaya DR, Iqbal TH, Taylor SA, Smith M, Brookes M, Hansen R, Hawthorne AB. British Society of Gastroenterology consensus guidelines on the management of inflammatory bowel disease in adults. Gut. 2019;68(Suppl 3):s1-s106. PMID: 31562236.

3. Holvoet T, Lobaton T, Hindryckx P. Optimal Management of Acute Severe Ulcerative Colitis (ASUC): Challenges and Solutions. Clin Exp Gastroenterol. 2021;14:71-81. PMID: 33727846.

4. Nakase H. Acute Severe Ulcerative Colitis: Optimal Strategies for Drug Therapy. Gut Liver. 2023;17:49-57. PMID: 36375793.

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_Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct._