What is the evidence that intentional IPAA in patients with CD and active rectal inflammation yields acceptable long‑term pouch outcomes

What is known

- A 2021 systematic review found IPAA in known preoperative CD is feasible with function equivalent to UC, but pouch failure stays higher even in highly selected patients. ¹ - Intentional IPAA has been proposed only for diffuse crohn's proctocolitis without enteric or anoperineal disease, and long-term data support it as acceptable in selected patients. ² - The panis/lariboisiere 10-year cohort (41 patients) reported 27% CD-related complications and ~10% pouch excision, judged good enough to offer in selected patients. ³ - Conflicting series exist: some report low failure and favorable function, others substantial poor function and high failure (e.g., 56% failure in CD vs 6% UC in one series). ^2,4

What is unknown / caveats

- Favorable long-term functional series vs older reports of high complication/failure rates in CD pouches - Some authors argue preoperative CD diagnosis should contraindicate IPAA; others report acceptable retention - No retrieved study isolates active rectal inflammation as a selection or outcome variable - Small, heterogeneous single-center cohorts; diagnostic reclassification (CD vs indeterminate colitis) confounds comparisons - 'intentional' vs inadvertent/postoperatively-diagnosed CD are mixed across studies - Whether active rectal inflammation specifically worsens pouch outcomes cannot be determined from these excerpts.

## References

1. Lightner AL, Jia X, Zaghiyan K, Fleshner PR. IPAA in Known Preoperative Crohn's Disease: A Systematic Review. Dis Colon Rectum. 2021;64(3):355-364. PMID: 33315711.

2. Li Y, Stocchi L, Mu X, Cherla D, Remzi FH. Long-term Outcomes of Sphincter-Saving Procedures for Diffuse Crohn's Disease of the Large Bowel. Dis Colon Rectum. 2016;59(12):1183-1190. PMID: 27824704.

3. Marteau P. Inflammatory bowel disease. Endoscopy. 2002;34(1):63-8. PMID: 11778131.

4. Wu H, Shen B. Crohn's disease of the pouch: diagnosis and management. Expert Rev Gastroenterol Hepatol. 2009;3(2):155-65. PMID: 19351286.

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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._