Prolonged diversion after ileal pouch-anal anastomosis: Is it safe to wait?

Aim: Diverting loop ileostomy reversal (DLI- R) is routinely performed from 2- 6 months following ileal pouch -anal anastomosis (IPAA). The safety of delayed reversal after IPAA is not well-defined. The aim of this study was to determine if prolonged diversion is associated with adverse outcomes compared to routine closure.Methods: Adult patients undergoing primary IPAA with DLI from 2000 to 2021 were included in this retrospective cohort study from our institutional database. Patients were stratified into tertiles based on timing of reversal: Routine (56- 116 days), Delayed (117- 180 days), or Prolonged (>6 months). Univariate analysis compared categorical variables between groups. Patients reversed at <8 weeks were excluded. Results: In total, 2615 patients underwent DLI- R following IPAA (3 -stage 61%, 2 -stage 39%; mean age 39.9 years). DLI- R was performed as Routine, Delayed and Prolonged in 1908 (72.9%), 426 (16.4%) and 281 (10.8%), respectively. Overall, DLI- R related compli- cations occurred in 12.4% (n = 324). The complication rate in the Routine group was 11% (n = 210), in the Delayed group was 12.2% (n = 52) and in the Prolonged group was 22.1% (n = 62). Reasons for prolonged diversion in the Prolonged group were complications at the time of IPAA in 207 (73.9%) or patient preference/scheduling in 73 (26.1%). DLI- R >6 months after IPAA due to complications had higher rates of overall complications following ileostomy reversal (OR 2.6, 95% CI 1.85- 3.72, p < 0.001) whereas when DLI- R was delayed due to preference/scheduling outcomes were not different than the Routine group (p = 0.28).Conclusion: Prolonged time to ileostomy reversal after IPAA is probably safe without increased risk of complications when due to patient preference.