Which description most accurately reflects the pathophysiologic etiology of fecal incontinence that may occur with inflammatory bowel disease?

Which description most accurately reflects the pathophysiologic etiology of fecal incontinence that may occur with inflammatory bowel disease?

• A. Myopathies develop that affect the pelvic floor muscles.
• B. The external sphincter becomes dysfunctional.
• C. Stool consistency is altered because bowel motility is slowed.
• D. The rectal mucosa may be inflamed which compromises rectal compliance.

Answer: (D)

When inflammatory bowel disease involves the rectum, inflammation of the rectal mucosa can reduce the rectum’s ability to store stool. This inflammation and edema decrease rectal compliance, meaning the rectum can’t distend adequately to accommodate stool. As a result, a strong urge to defecate is triggered more readily and leakage can occur before voluntary sphincter control is regained, especially during episodes of diarrhea common in IBD. Other options describe mechanisms more typical of non-IBD causes—pelvic floor muscle issues, external sphincter dysfunction, or altered motility—not the rectal mucosal inflammation that directly compromises storage capacity in this context.

When inflammatory bowel disease involves the rectum, inflammation of the rectal mucosa can reduce the rectum’s ability to store stool. This inflammation and edema decrease rectal compliance, meaning the rectum can’t distend adequately to accommodate stool. As a result, a strong urge to defecate is triggered more readily and leakage can occur before voluntary sphincter control is regained, especially during episodes of diarrhea common in IBD. Other options describe mechanisms more typical of non-IBD causes—pelvic floor muscle issues, external sphincter dysfunction, or altered motility—not the rectal mucosal inflammation that directly compromises storage capacity in this context.