What are the most common risk factors for portomesenteric venous thrombosis after colorectal resection

What is known

- In 1,069 laparoscopic colorectal resections (3.5% symptomatic PVT), univariate risk factors included IBD, ulcerative colitis, preoperative steroids, operative time ≥220 min, total proctocolectomy, ileoanal pouch, and postoperative septic complications. ¹ - A single-center review of 1,224 colorectal surgery patients found a PMVT rate of ~3% (initially underdiagnosed at 1.4% before expert radiologic review). ² - Recognized predisposing states beyond surgery include IBD, malignancy, abdominal sepsis, intraoperative mesenteric vessel manipulation, pneumoperitoneum, and inherited hypercoagulable conditions. ¹ - Studies of medically refractory UC undergoing proctocolectomy have specifically sought PMVT risk stratification to guide extended postoperative prophylaxis, though no standardized guidelines exist. ³

What is unknown / caveats

- All supporting data are single-center retrospective cohorts - Several risk factors were identified on univariate analysis only in the retrieved excerpts - PMVT is frequently underdiagnosed, so rates and associations may be understated - No standardized criteria exist for which patients warrant extended postoperative PMVT/VTE prophylaxis.

## References

1. Allaix ME, Krane MK, Zoccali M, Umanskiy K, Hurst R, Fichera A. Postoperative portomesenteric venous thrombosis: lessons learned from 1,069 consecutive laparoscopic colorectal resections. World J Surg. 2014;38:976-84. PMID: 24240673.

2. PMID: 25159636. (metadata not in corpus)

3. Kayal M, Radcliffe M, Plietz M, Rosman A, Greenstein A, Khaitov S, Sylla P, Dubinsky MC. Portomesenteric Venous Thrombosis in Patients Undergoing Surgery for Medically Refractory Ulcerative Colitis. Inflamm Bowel Dis. 2020;26:283-288. PMID: 31372644.

For educational use only, not a substitute for clinical judgement or medical advice. Consult qualified clinicians for diagnosis and treatment decisions. This tool may contain errors; use the flag button below to report inaccurate or harmful content.

---

_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._