Extended duration of faecal diversion is associated with increased ileus upon loop ileostomy reversal.

AIM The timing of ileostomy reversal has been the subject of controversy, with researchers investigating the safety of early versus late stoma closure. Anecdotally, a longer duration of faecal diversion is associated with a greater incidence of post-operative ileus. We sought to investigate the association between duration of diversion and post-operative ileus. METHOD We conducted an institutional retrospective cohort study on 173 patients undergoing ileostomy closure between 2012 and 2018. Our primary outcome was ileus; secondary outcomes included post-operative complications and descriptive factors. We investigated the association between duration of diversion and ileus using several analyses to ensure that time was treated appropriately as a continuous, non-linear variable. RESULTS 20.2% of patients had an ileus. Multivariate analysis did not identify a significant association between any independent predictors and ileus, although there was a trend towards increased risk of ileus with increasing duration of diversion. When treated as a categorical variable, a duration of diversion >328 days independently increased the odds of ileus (OR=3.25, p=0.033). Duration of diversion was associated with days to first flatus and to first diet (p=0.025 and p=0.004, respectively). When patients received nasogastric intubation, the mean duration of intubation was 3.2 days. CONCLUSION Greater duration of diversion was associated with a trend towards increased risk of ileus; this risk tripled when diversion lasted more than 328 days.