Hirschsprung Disease Part 2
With Dr. Mark Levitt · hosted by Dr. Todd Ponsky · Marc Levitt
Educational content from recorded physician discussions — not medical advice. Talk to your (or your child's) care team about your situation.
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What the experts said
The vast majority of Hirschsprung patients do extremely well post-pull-through with normal emptying and bowel control.
Post-pull-through problems divide into two types: obstruction (failure to empty) and soiling.
Enterocolitis after a well-done pull-through is common in babies because they have very tight sphincters capable of staying tight for many hours.
After about age one, patients should learn to relax their sphincters and have normal bowel movement patterns; persistent enterocolitis after age one requires evaluation.
Evaluation of post-pull-through obstruction involves contrast study of the colon and examination under anesthesia.
Anatomic causes of post-pull-through obstruction include distal stricture, obstructing cuff, Duhamel pouch dysfunction, twisted pull-through, and dilated distal segment.
An obstructing cuff results when the aganglionic outer rectal wall (in Soave procedure) is not properly split, fuses, or scars, causing physiologic obstruction.
Pathologic causes of obstruction include pull-through to transition-zone bowel (nerves >40 microns) rather than healthy ganglionated bowel.
Healthy ganglion cells and nerves ≤40 microns are required in the pull-through segment; larger nerves indicate transition-zone bowel that may not function.
Acute enterocolitis treatment: IV hydration, IV metronidazole, and rectal irrigations 2–3 times daily with 10–20 cc/kg saline via size 20–22 Foley catheter.
Metronidazole has equivalent efficacy IV or PO because both routes depend on biliary excretion into the colon.
In a diverted colon (ileostomy), oral metronidazole will not reach the colon; vancomycin enemas are required for colonic C. difficile.
After age one, enterocolitis should not recur; persistent episodes obligate search for anatomic or pathologic cause.
On contrast enema, the pull-through should hug the sacrum; anterior deviation suggests a space-occupying cuff in the presacral space.
A cuff is palpable on digital rectal exam as a rubbery, thick rubber-band structure along the sacral hollow, outside the pull-through lumen.
Many clinicians miss a cuff on exam because they focus intraluminally; the cuff is extraluminal and requires deliberate palpation outside the pull-through.
Biopsy should be taken 1 cm above the dentate line and sent for permanent section (not frozen) to assess ganglion cells and nerve size in redo cases.
Transition-zone pull-through (ganglion cells present but hypertrophic nerves) in a symptomatic patient requires redo pull-through to healthy ganglionated bowel.
Redo pull-through technique: transanal full-thickness dissection in Swenson plane, cuff removal, mobilization (often sigmoid resection) to reach healthy bowel.
For obstructing cuff, dissect pull-through from cuff, then cuff from Swenson plane; excise posterior-lateral cuff to break the ring, avoiding anterior dissection near urethra/vagina.
Myectomies that appear successful likely inadvertently cut the cuff rather than internal sphincter; technique is variable and risks sphincter injury causing incontinence.
Post-pull-through sphincter problems are relatively rare compared to anatomic causes; most obstruction is not sphincter-related.
If all anatomic causes are excluded and pathology is normal, persistent obstruction indicates sphincter dysfunction (failure to relax), confirmable by anorectal manometry.
Botox injection acts as a temporary myectomy; as it wears off (4–8 weeks), patients learn sphincter coordination, avoiding permanent incontinence risk of surgical myectomy.
Botox can temporarily improve cuff obstruction if injection migrates proximally, but recurrence indicates need for definitive cuff excision.
Anorectal manometry can distinguish sphincter dysfunction (1 cm high-tone zone) from cuff obstruction (3–4 cm high-tone zone).
Twisted pull-through: dissect in Swenson plane to peritoneal reflection, often via laparotomy (not laparoscopy) due to adhesions; untwist and redo pull-through preserving sigmoid arcade.
Failed Duhamel pouch (too large, inert, preventing emptying) requires removal—the most difficult Hirschsprung reoperation due to pelvic fibrosis from stapled anastomosis.
Duhamel redo technique: transanal dissection of both limbs, deep pelvic dissection via laparotomy with St. Mark's retractor, excise pouch, redo as Swenson pull-through.
All Hirschsprung patients should be able to empty spontaneously and be clean; prolonged soiling into teenage years is not acceptable.
Hirschsprung patients are born with normal anal canal and sphincters; soiling due to lost dentate line or weak sphincters is iatrogenic from surgery.
Iatrogenic sphincter/anal canal damage occurs from transanal dissection started too low (invading dentate line) or overstretching during dissection.
Contrast study in soiling patients assesses colonic caliber: narrow colon suggests hypermotility, dilated colon suggests hypomotility.
Soiling scenario 1: intact anal canal/sphincters + narrow colon (hypermotile)—treat with loperamide, constipating diet, water-soluble fiber.
Soiling scenario 2: intact anal canal/sphincters + dilated colon (hypomotile)—treat with laxatives to speed transit; bridge enemas may be used short-term.
Soiling scenario 3: lost anal canal/sphincters + narrow colon (hypermotile)—low-volume enemas for social continence plus antimotility agents.
Soiling scenario 4: lost anal canal/sphincters + dilated colon (hypomotile)—high-volume enemas; no antimotility treatment needed.
Patients without capacity for bowel control (lost sphincters/anal canal) may require Malone appendicostomy or cecostomy for antegrade enemas.
Every problematic Hirschsprung patient should undergo contrast enema and examination under anesthesia; methodical evaluation identifies solvable pathology.
Literature reports 15–20% of post-pull-through patients have an enterocolitis episode within the first year.