Show notes
Episode three covers fecal incontinence managed in a fixed sequence and the benign anorectal disorders anchored to the dentate line. Incontinence rarely fails for a single reason, so the workup canvasses the whole continence stack and the treatment runs from optimizing the modifiable factor through loperamide and biofeedback to sacral neuromodulation, which has displaced sphincteroplasty as first-line surgery for refractory disease. The benign disorders follow the anatomy: above the dentate line means painless bleeding, below it means sharp pain, and that landmark predicts management for hemorrhoids, anal fissure, and pruritus ani. Manometry, endoanal ultrasound, the seventy-two-hour rule, and the atypical-fissure workup throughout.
Topics covered
The continence stack and multifactorial failure
Etiologic grid: sphincter, rectal, neurologic, consistency, overflow
History and targeted testing with manometry and endoanal ultrasound
Fixed treatment sequence from modifiable factors to loperamide and biofeedback
Sacral neuromodulation versus sphincteroplasty
Internal and external hemorrhoids and the dentate line
Anal fissure mechanism and atypical-location workup
Pruritus ani as a symptom, not a diagnosis
Key decisions
Endoanal ultrasound is the test of choice for sphincter integrity, mapping anterior defects from obstetric trauma the exam misses, while anorectal manometry is the most informative single test and changes management in most cases.
Soluble fiber like psyllium is the counterintuitive first move in leakage of liquid stool because firm stool is easier to retain than soft stool even with a damaged sphincter, alongside treating impaction and any diarrheal disease.
Loperamide is the drug that follows, a peripheral opioid agonist that slows transit, raises internal sphincter tone, and inhibits the rectoanal inhibitory reflex, all three helping.
For refractory fecal incontinence, sacral nerve stimulation is the favored answer and has displaced sphincteroplasty; the staged trial requires at least fifty percent symptom improvement before permanent implantation.
Sphincteroplasty is reserved for the younger woman with an isolated external sphincter defect from obstetric injury, buying time because outcomes decline over years as pudendal neuropathy undoes the repair.
Thrombosed external hemorrhoids are excised within seventy-two hours of onset for faster pain relief, but after seventy-two hours conservative management is preferred, and the procedure is excision of the whole hemorrhoid, not incision and drainage.
A posterior or anterior midline anal fissure is idiopathic, but a lateral, multiple, or atypical fissure demands a Crohn's and infection workup before topical therapy; treatment layers topical calcium channel blockers, then botulinum toxin, then lateral internal sphincterotomy.
For the full chapter with MCQs, tables, and primary-guideline references, visit www.boardpearls.com.
Questions or feedback: [email protected].
(00:00) - Introduction and the continence stack
(01:27) - The etiologic grid of incontinence
(02:48) - History and targeted testing
(04:28) - The fixed treatment sequence
(05:52) - Sacral neuromodulation versus sphincteroplasty
(08:01) - Hemorrhoids and the dentate line
(10:03) - Thrombosed external hemorrhoids and the 72-hour rule
(11:05) - Anal fissure
(13:42) - Pruritus ani