Long-term effect of preoperative radiation therapy on anorectal function

Diseases of the Colon and Rectum
J PollackAnders Mellgren

Abstract

Preoperative radiotherapy improves local control in rectal cancer treatment, but there are few reports on the influence of radiotherapy on anorectal function. The aim of the present study was to assess late effects of short-course, high-dose radiotherapy on anorectal function after low anterior resection for rectal cancer. Sixty-four patients, randomized within the Stockholm Radiotherapy Trials and operated on with low anterior resection with or without preoperative radiotherapy (mean, 14 years), previously were followed up with quality-of-life questionnaires, clinical examination, anorectal manometry, and endoanal ultrasound. Twenty-one patients had received preoperative radiotherapy of the rectum and 43 patients had been treated with surgery alone. Impaired anorectal function was common after low anterior resection for rectal cancer and the risk was increased after radiotherapy. Irradiated patients had significantly more symptoms of fecal incontinence (57 vs. 26 percent, P = 0.01), soiling (38 vs. 16 percent, P = 0.04), and significantly more bowel movements per week (20 vs. 10, P = 0.02). At anorectal manometry, irradiated patients had significantly lower resting (35 mmHg vs. 62 mmHg, P < 0,001) and squeeze pressures (104 mm...Continue Reading

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