Aim: The aim of this retrospective study was to evaluate the frequency and risk factors of urinary dysfunction after autonomic nerve-preserving surgery for rectal cancer.
Methods: This was a retrospective multiinstitution study of 1002 rectal cancer patients conducted between January 2008 and December 2012 in Yokohama Clinical Oncology Group. Patients who had preoperative urinary dysfunction or had not undergone autonomic nerve preservation surgery were excluded. Urinary dysfunction was defined as that with a Clavien-Dindo classification grade ≥ 2. Patient-, tumor-, and surgery-related variables were examined by univariate and multivariate analyses.
Results: A total of 887 patients were analyzed. Postoperative urinary dysfunction was observed in 77 patients (8.8%). A multivariate logistic analysis showed that a tumor location in lower rectum (odds ratio [OR] 2.16; 95% confidence interval [CI] 1.15-3.71; p = 0.02), tumor diameter ≥ 40 mm (OR 2.07; 95% CI 1.19-4.44; p < 0.01), operation time ≥ 240 min (OR 2.07; 95% CI 1.19-4.44; p < 0.01), blood loss ≥ 300 ml (OR 2.35; 95% CI 1.12-3.84; p = 0.02), and diabetes (OR 3.26; 95% CI 1.80-5.89; p < 0.01) were independent risk factors of urinary dysfunction. The incidence of urinary dysfunction exceeded 20% in patients with 3 preoperative predictors (tumor location, tumor diameter, diabetes).
Conclusions: This result demonstrated that high-risk patients with more than two risk factors should be informed of the risk of urinary dysfunction.
Trial Registration: UMIN000033688.
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