Related Experiment Videos
Long-term anorectal dysfunction after postoperative radiotherapy for rectal cancer
Lilli Lundby1, Klaus Krogh, Vagn J Jensen
1Surgical Research Unit, Department of Surgery L, Aarhus University Hospital, Section TGH, Aarhus, Denmark. Lilli@dadlnet.dk
Diseases of the Colon and Rectum
|June 4, 2005
Summary
Adjuvant radiotherapy for rectal cancer significantly increases long-term anorectal dysfunction, leading to reduced rectal capacity and sphincter function. This impacts bowel control and quality of life for patients.
Area of Science:
- Gastroenterology
- Oncology
- Surgical Oncology
Background:
- Adjuvant radiotherapy is used in rectal cancer treatment but can cause long-term morbidity.
- Anorectal dysfunction following radiotherapy is a significant concern, with poorly understood physiological changes.
Purpose of the Study:
- To examine the long-term anorectal morbidity associated with adjuvant postoperative radiotherapy in rectal cancer patients.
Main Methods:
- Prospective study of patients with Dukes B or C rectal carcinoma randomized to postoperative radiotherapy or no adjuvant treatment.
- Assessment of long-term anorectal function via questionnaires, physiology laboratory evaluation, and flexible sigmoidoscopy.
Main Results:
- Radiotherapy group showed significantly increased bowel frequency (80% vs 23%), loose stools (60% vs 23%), and fecal incontinence (60% vs 8%).
- Irradiated patients experienced reduced rectal capacity (146 vs 215 ml) and maximum anal squeeze pressure (59 vs 93 cm H2O).
- Endoscopy revealed mucosal atrophy and telangiectasias; physiology showed reduced rectal distensibility (P < 0.0001).
Conclusions:
- Adjuvant postoperative radiotherapy after anterior resection leads to severe, long-term anorectal dysfunction.
- This dysfunction results from a weakened, less sensitive anal sphincter and a rectum with reduced capacity and distensibility.