Anorectal function in patients with defecation disorders and asymptomatic subjects: evaluation with defecography.

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Abstract
A controlled radiologic study of anorectal function was performed with the use of defecography in 19 patients with constipation and 13 with incontinence. All patients were age and sex matched to control subjects who were referred for barium enema study and who had no defecation disorder. There were no statistically significant differences between either patient group and the control group in anorectal angle and excursion of the anorectal junction. In the 32 patients and 155 consecutive patients referred for defecography because of a variety of defecation disturbances, approximately twice as many rectal wall abnormalities were seen compared with findings in the control group. These findings included intussusception, rectal prolapse, rectocele, mucosal prolapse, spastic pelvic floor, descending perineum syndrome, and solitary rectal ulcer syndrome. In conclusion, the main role of defecography is to document rectal wall changes during defecation straining as possible causes of evacuation difficulties. Clinical symptoms should also be taken into account when treatment is contemplated.

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