Annals of Coloproctology

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Original Article

Complications

Prevalence and clinical significance of evacuation disorders in patients with low anterior resection syndrome: Yuko Homma, Toshiki Mimura, Koji Koinuma, Hisanaga Horie, Naohiro Sata; Ann Coloproctol. 2025;41(4):271-278. Published online August 25, 2025; DOI: https://doi.org/10.3393/ac.2024.00934.0133

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Abstract PDF: Purpose
Low anterior resection syndrome (LARS) manifests with evacuation disorder symptoms and continence problems. However, no prior study has focused on evacuation disorders in patients with LARS. This study investigated the prevalence of evacuation disorders and their association with the LARS score.
Methods
This study included patients with defecation per anus at the time of the survey, which was conducted between November 2020 and April 2021. These patients had undergone anus-preserving surgery for rectal tumors between 2014 and 2019 at a tertiary university hospital. The severity of evacuation disorders and LARS was evaluated using the Constipation Scoring System and the LARS score, respectively. The primary endpoint was the prevalence of evacuation disorders, defined as evacuation difficulty, feeling of incomplete evacuation, and abnormally long time on the toilet. The secondary endpoints were the associations between these symptoms and the LARS score.
Results
Of 332 eligible patients, 238 (71.7%) completed the questionnaire. The overall prevalence of evacuation disorders was 48.3%. The rates of feeling incomplete evacuation, evacuation difficulty, and prolonged time on the toilet were 45.6%, 15.5%, and 8.4%, respectively. Patients with minor or major LARS had a significantly higher prevalence of evacuation disorders than those with no LARS, particularly regarding feeling incomplete evacuation.
Conclusion
Evacuation disorders were present in 48.3% of patients following anus-preserving surgery. Greater severity of LARS was associated with a higher prevalence of evacuation disorders, especially a feeling of incomplete evacuation. Patients should be informed about the potential for both evacuation disorders and continence-related symptoms following anus-preserving surgery.

Randomized Controlled Trial

Clinical and Physiologic Anorectal Function after Low Anterior Resection in Patients with Rectal Cancer: A Prospective Randomized Comparison of Straight and Colonic J-Pouch Anastomoses.: Choi, Hong Jo , Kim, Sung Heun , Park, Ki Jae; J Korean Soc Coloproctol. 2003;19(2):101-107.

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Abstract PDF: PURPOSE
The aim of this prospective study was to analyze anorectal physiologic and clinical outcomes of the colonic J-pouch-anal anastomosis compared with the traditional straight colorectal anastomosis after ultra-low anterior resection in patients with rectal cancer, thus to define if this method of modified reconstruction has a functional superiority.
METHODS
After total mesorectal excision for mid or low rectal cancers, patients were randomized to either a straight (n=23) or a colonic J-pouch anastomosis (n=24) to the lowermost rectum or anal canal. Functional outcomes were compared between two groups using an anorectal manometry performed before and 1 year after surgery and a bowel function questionnaire administered 6 months and 1 year postoperatively.
RESULTS
Except the arithmetic level of anastomosis which was significantly higher in straight group than in pouch group (5.1 +/- 1.2 cm vs. 3.8 +/- 0.9 cm; P=0.0001), the two groups were well matched for demographic distribution, pathologic stage, colonic segment used for neorectum and use of adjuvant therapies. Patients with colonic J-pouch anastomosis showed functional superiority in terms of frequency of bowel movements, degree of urgency at 6 months (P<0.0001 and =0.03, respectively) and 1 year postoperatively (P<0.0001 and <0.05, respectively). Functional parameters, including incontinence to liquid stool and impaired discrimination between gas and stool were more pronounced in straight group after 6 months (P=0.04, and <0.05, respectively), but the differences were not statistically significant after 1 year. Sensation of incomplete evacuation was not different statistically between groups at 6 months, but more common in J-pouch group at 1 year (39.1% vs. 8.3%; P=0.04). As well as the length of high pressure zone and presence of rectoanal inhibitory reflex, there was no difference in sphincter pressure parameters between groups either before or 1 year after surgery. Maximal tolerable volume of the neorectum in J-pouch group was 110.2 +/- 16.7 ml, which was significantly larger than that of 74.1 +/- 14.9 ml in straight group (P<0.0001), and the neorectum in J-pouch group was significantly more compliant than that in straight group (6.1 +/- 1.9 vs. 3.3 +/- 2.1; P<0.0001) in 1 year after surgery.
CONCLUSIONS
Construction of a colonic J-pouch as a substitute for the rectum restores neorectal volume and compliance. Clinically it offers patients superior anorectal function compared with straight anastomosis. To minimize evacuation difficulty associated with the pouch, optimal size of the pouch should be defined, thus to achieve an ideal balance between stool frequency/urgency and evacuation problems through larger prospective studies.

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