The Selective Use of a Diverting Stoma in Rectal Surgery

A diverting stoma is recommended by some as a routine procedure to lower incidence of AL and mitigate its consequences. Others, however, state that the diverting stoma is overused, as they describe no differences in AL rate between patients with and without a diverting stoma.1 Next to this, many patients experience stoma-related morbidity such as skin irritation, dehydration, stoma site complications, psychological distress, and reversal surgery with potential complications. Ultimately, many patients never undergo a reversal of their diverting stoma.2 Between 2007 and 2019, 89% of the patients who underwent rectal cancer surgery in Australia or New Zealand received a diverting stoma.3 In the Netherlands, however, the incidence of a diverting stoma in rectal surgery is considerably low (40% in 2016) and reduced in the last decade. 4 The relatively low application rate is possibly due to a selection of patients. This study was designed to identify patient characteristics and intraoperative conditions related to the presence of a diverting stoma and the impact on anastomotic leakage. Method


Introduction
A diverting stoma is recommended by some as a routine procedure to lower incidence of AL and mitigate its consequences. Others, however, state that the diverting stoma is overused, as they describe no differences in AL rate between patients with and without a diverting stoma. 1 Next to this, many patients experience stoma-related morbidity such as skin irritation, dehydration, stoma site complications, psychological distress, and reversal surgery with potential complications. Ultimately, many patients never undergo a reversal of their diverting stoma. 2 Between 2007 and 2019, 89% of the patients who underwent rectal cancer surgery in Australia or New Zealand received a diverting stoma. 3 In the Netherlands, however, the incidence of a diverting stoma in rectal surgery is considerably low (40% in 2016) and reduced in the last decade. 4 The relatively low application rate is possibly due to a selection of patients. This study was designed to identify patient characteristics and intraoperative conditions related to the presence of a diverting stoma and the impact on anastomotic leakage.

Method
The data were used of a prospective, observational study from January 2016 to December 2019 from fourteen hospitals in four countries. This study was an additional subanalysis of the LekCheck study. 5 All patients undergoing rectum resection with primary anastomosis were included.

Results
A total of 351 patients were included for this sub-study. A diverting stoma was created in 97 patients (27.6%). The following seven variables were associated with a diverting stoma in univariate analysis: smoking status, neoadjuvant therapy, American Joint Committee on Cancer stage, tumor distance, fluid administration, blood loss, and an intraoperative event. In the multivariate analysis, the following variables were independently associated with a diverting stoma: tumor distance (p < 0.001), neoadjuvant therapy (p < 0.001), blood loss (p = 0.003), fluid administration (p = 0.003), and an intraoperative event (p = 0.022). Anastomotic leakage occurred in nine patients (9.3%) with a diverting stoma and in 34 patients (13.4%) without (p = 0.297). In patients with anastomotic leakage, fewer interventions were necessary when a diverting stoma was constructed (p = 0.001) (Tables 1, 2, and 3).

Discussion
This study found that the following factors were independently associated with a diverting stoma: tumor distance, neoadjuvant therapy, blood loss during surgery, fluid administration, and an intraoperative event. The use of a diverting   stoma in this study was relatively low (27.6%) and although the anastomotic leak rate was lower in patients with a diversion, this difference was not statistically significant. Other authors found that selective use of diverting stomas led to the same incidence of AL compared to policies in which diverting stoma was more routinely used. 6 Proper application of selective use would drastically lower the burden of the stoma, preventing stoma-related complications (e.g., parastomal hernias, dehydration, stoma prolapse), discomfort, and costs, for many patients. On the other hand, it can potentially reduce complications in patients who are at high risk for AL, since fewer reinterventions were necessary for patients with AL and a diverting stoma.

Conclusion
The study showed differences in patient characteristics and intraoperative variables in patients with and without a diverting stoma. A diverting stoma showed a protective effect as the impact of AL was less severe, resulting in fewer reinterventions. Selective use is therefore suggested, since it prevents unnecessary application while protecting patients. The current focus should be on techniques to identify patients with increased risk as soon as the rectum resection, in order to apply the protective stoma restrictively in patients at risk.
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