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Background  Low anterior resection (LAR) is often performed with diverting loop ileostomy (DLI) for anastomotic protection in patients with rectal cancer. We aim to analyze, if older patients are more prone to a decline in kidney function following creation and closure of DLI after LAR for rectal carcinoma versus younger patients.    Methods  A retrospective cohort study from a database including 151 patients undergoing LAR for rectal carcinoma with DLI was used. Patients were divided in two age groups (Group A: <65 years,  n  = 79; Group B: ≥65 years,  n  = 72). For 123 patients undergoing DLI reversal prognostic factors for an impairment of serum creatinine (SCr) and estimated glomerular filtration rate (eGFR) 3 months after DLI reversal was analyzed using a multivariate linear regression analysis.    Results  SCr before LAR(T 0 ) was significant higher in Group B ( P  = 0.04). Accordingly, the eGFR at T 0  in group B was significantly lower ( P  < 0.001). No patients need to undergo hemodialysis after LAR or DLI reversal.  Age and SCr at T 0 were able to statistically significant predict an increase in SCr ( P <0.001) and eGFR ( P =0.001) three months after DLI reversal (The R² for the overall model was .82 (adjusted R² = .68).    Conclusion  DLI creation may result in a reduction of eGFR in older patients 3 months after DLI closure. Apart from this, patients do not have a higher morbidity after creation and closure of DLI resulting from LAR regardless of their age.

bmc geriatrics

The association of age with decline in renal function after low anterior resection and loop ileostomy for rectal cancer: a retrospective cohort prognostic factor study