In patients undergoing elective colectomy for UC with a history of prior DVT, should extended‑duration pharmacologic prophylaxis be prescribed beyond the standard postoperative period

What is known

- Guidance recommends pre- and postoperative thromboprophylaxis in IBD patients not at bleeding risk, and prophylaxis specifically in hospitalized patients with a previous history of thrombosis. ¹ - Routine pharmacologic thromboprophylaxis is recommended in hospitalized IBD patients, particularly during flares or in the perioperative setting. ² - Deep vein thrombosis increases the risk of DVT recurrence, making prevention important, though no agreement exists on secondary prophylaxis to prevent recurrence in this population. ³

What is unknown / caveats

- One guideline (Canadian Gastroenterology Association) previously recommended against routine prophylaxis in some settings while recommending it for prior thrombosis history, obesity, or surgery ¹ - No excerpt addresses the duration of postoperative prophylaxis or extended post-discharge prophylaxis after colectomy - Excerpts on prior thrombosis focus on hospitalized/perioperative use, not the extended-duration question - The excerpts note there is no established agreement on the duration of anticoagulation or secondary prophylaxis in IBD patients with prior thrombosis.

## References

1. Martín-Masot R, Ortiz Pérez P, Serrano Nieto J, Martínez León M, Pascual Martínez A, Blasco-Alonso J, Navas-López VM. Central Venous Sinus Thrombosis in a Boy With Acute Severe Ulcerative Colitis. Front Pediatr. 2019. PMID: 30775357.

2. Wang KT, Su MI, Chiou WR, Chao CL, Huang YF, Cheng CH. Impact of venous thromboembolism on mortality in hospitalized patients with inflammatory bowel disease: analysis of the MIMIC-IV database, 2008 to 2022. BMC Gastroenterol. 2025. PMID: 41267022.

3. Yep-Gamarra V, Amaya-Vásquez N, Vásquez-Tirado G, Mora E, Donet-Mostacero J. [Deep vein thrombosis as an extraintestinal manifestation of ulcerative colitis. Presentation of a case]. Rev Gastroenterol Peru. 2012. PMID: 23023184.

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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._