Motility / Pseudo-obstruction
Also covered as: Hirschsprung disease · intestinal failure · necrotizing enterocolitis · gastroschisis · intestinal atresia · constipation · soiling · outlet obstruction
Educational content from recorded physician discussions — not medical advice. Always talk to your child's care team about your child's situation.
Content of this collection
Fundamentals
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Intestinal rehabilitation: What is intestinal rehab? - Episode 1
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We’re starting a new series about intestinal rehabilitation and all of its intricacies. We’re joined by Drs. Michael Helmrath and Paul Wales, leaders of the Intestinal Rehabilitation Program at Cincinnati Children’s. Hosted by: Todd Ponsky,
video14:33 · Dec 2021
Intestinal Rehabilitation, Episode 1: What is intestinal rehabilitation?
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We’re starting a new series about intestinal rehabilitation and all of its intricacies. We’re joined by Drs. Michael Helmrath and Paul Wales, leaders of the Intestinal Rehabilitation Program at Cincinnati Children’s. Hosted by: Todd Ponsky,
podcast14:33 · Dec 2021
Diagnosis & Workup
1 item
Colorectal Collaboration: Neurogastroenterology/Motility Disorders
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Pediatric Colorectal Surgery is a team sport. That's why this episode is about how the pediatric colorectal surgery team, lead by Dr. Jason Frischer, collaborates with the neurogastroenterology department at Cincinnati Children's Hospital M
video14:55 · Jul 2021
Case-Based Learning
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The Colorectal Quiz Episode 8: Motility Disorders Part 1
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Motility disorder is a team sport - that's why today, we're talking to our colleagues in Pediatric Gastroenterology, Dr. Anil Darbari from Children's National Hospital and Dr. Kahleb Graham from Cincinnati Children's Hospital. Special guest
podcast14:04 · Mar 2021
The Colorectal Quiz Episode 9: Motility Disorders Part 2
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Motility disorder is a team sport - that's why today, we're talking to our colleagues in Pediatric Gastroenterology, Dr. Anil Drabari from Children's National Hospital and Dr. Kahleb Graham from Cincinnati Children's Hospital. Special guest
podcast13:52 · Apr 2021
Colorectal Quiz: Episode 42 - HD Constipation
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In this episode of the Colorectal Quiz, Drs. Mark Levitt, Jason Frischer, and Chris Gayer discuss a complex case of persistent constipation in a patient with a history of Hirschsprung’s disease. Despite a successful pull-through surgery in
podcast14:48 · Dec 2024
In-Depth Reviews
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Intestinal Failure with Dr. Brad Warner
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Discussion with Dr. Brad W. Warner about intestinal failureWhat is intestinal failure?An umbrella term for when the small bowel is unable to digest and absorb an adequate amount of nutrients to sustain a patient through enteral means alone.
podcast52:46 · Dec 2020
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Intestinal failure—insufficient gut function to absorb nutrients, fluids, and calories—requires parenteral support for ≥60 days and is most commonly caused by short bowel syndrome (congenital anomalies, NEC, volvulus) [e296-c1, e4741-c2, e4741-c4, e4741-c5, e4741-c6]. Salvageability thresholds: neonates with ileocecal valve need 10–15 cm; without valve, 15–20 cm [e296-c3, e296-c4]. Intestinal adaptation occurs over 1–2 years; enteral advancement tolerates stool outputs up to 40 cc/kg/day [e296-c7, e296-c8]. TPN targets 100–120 kcal/kg/day (50% glucose, remainder fat/protein at 2–3 g/kg/day each); lipid reduction to 1 g/kg/day 2–3×/week mitigates cholestasis [e296-c9, e296-c10, e296-c12]. Omegaven (fish oil, omega-3) and SMOF lipid (soybean/MCT/olive/fish) have replaced soybean-based intralipid [e296-c13, e296-c14]. Breast milk is optimal for adaptation (growth factors, oligosaccharides); complex formulas stimulate enterotrophic hormones better than elemental [e296-c15, e296-c16]. Surgical intervention (STEP, Bianchi, tapering) is indicated when enteral tolerance plateaus, multiple sepsis episodes occur, or bowel dilation >4–5 cm persists [e296-c18, e296-c19, e296-c22]. STEP is preferred (easier, less vascular risk) but can redilate; Bianchi can precede STEP but not vice versa [e296-c26, e296-c27, e296-c28]. Teduglutide (GLP-2 analog) reduces adult TPN by 1–2 L/week but lacks pediatric approval due to malignancy concerns [e296-c35, e296-c36]. Multidisciplinary intestinal rehabilitation programs achieve >90% long-term survival .
Constipation phenotypes require targeted workup: outlet obstruction (markers in rectum), slow transit (scattered markers), or normal transit [e4366-c4, e4366-c7, e4366-c8]. Anorectal manometry is the gold standard—absent rectoanal inhibitory reflex (RAIR) suggests Hirschsprung; high resting pressure indicates Botox candidacy; dyssynergia warrants pelvic floor therapy [e3824-c17, e3824-c19, e3888-c4, e3888-c5]. Colonic manometry identifies dysmotility: ≥2 high-amplitude propagating contractions (HAPCs) in 18–24 hours rules out colonic dysmotility; absence of HAPCs or no stimulant response confirms dysfunction [e3888-c19, e3888-c21, e3888-c29]. Segmental dysmotility <30 cm is managed conservatively; >30–50 cm is a red flag [e9506-c23, e4366-c19]. Antegrade enemas (Malone/cecostomy) succeed in 97% of segmental cases, avoiding resection [e9506-c25, e6886-c33]. Post-Hirschsprung constipation stems from sphincter/pelvic floor dysfunction, not colonic dysmotility—colonic manometry is contraindicated until distal obstruction is excluded [e9506-c14, e9506-c19, e9506-c21].
- Neonatal short bowel salvageability: 10–15 cm with ileocecal valve, 15–20 cm without; adaptation takes 1–2 years with stool outputs ≤40 cc/kg/day tolerated during enteral advancement.
- STEP is preferred lengthening procedure (easier, less vascular risk) but can redilate requiring redo; Bianchi can precede STEP but not vice versa; taper preferred if length >90–100 cm.
- Anorectal manometry differentiates outlet obstruction (absent RAIR, high resting pressure) from pelvic floor dysfunction (dyssynergia); colonic manometry requires ≥2 HAPCs in 18–24 hours to exclude dysmotility.
- Antegrade enemas succeed in 97% of segmental dysmotility cases; resection reserved for pan-colonic slow transit or failure of conservative therapy including Malone/cecostomy.
- Post-Hirschsprung constipation stems from sphincter/pelvic floor dysfunction, not colonic dysmotility—colonic manometry contraindicated until distal obstruction excluded; Botox and biofeedback are first-line.
For patients & families
When a child's intestine cannot move food and waste normally, doctors call this a motility problem or pseudo-obstruction [e4741-c7, e4741-c8]. The bowel muscle or the nerves controlling it don't work together properly, so even though the intestine is present, it acts as if something is blocking it . Some children are born with these conditions; others develop them after surgery or illness [e4741-c5, e4741-c6]. Doctors use special tests — like manometry, which measures pressure inside the bowel, and transit studies with tiny markers or scans — to understand where and how the intestine is struggling [e4366-c1, e6853-c5, e6853-c8]. Treatment often starts with medications (laxatives, stimulants) and sometimes special flushing routines through a small surgical opening (a Malone) to help the bowel empty [e6886-c29, e9506-c27]. Most children improve with these approaches; surgery to remove part of the colon is reserved for those who don't respond [e6886-c31, e6886-c32]. A team of specialists — surgeons, gut doctors, dietitians, nurses — works together to find what helps each child . The goal is a bowel that empties reliably, even if that means ongoing help rather than a cure .
When a child's intestine cannot move food and waste normally, doctors call this a motility problem or pseudo-obstruction [e4741-c7, e4741-c8]. The bowel muscle or the nerves controlling it don't work together properly, so even though the intestine is present, it acts as if something is blocking it . Some children are born with these conditions; others develop them after surgery or illness [e4741-c5, e4741-c6]. Doctors use special tests — like manometry, which measures pressure inside the bowel, and transit studies with tiny markers or scans — to understand where and how the intestine is struggling [e4366-c1, e6853-c5, e6853-c8]. Treatment often starts with medications (laxatives, stimulants) and sometimes special flushing routines through a small surgical opening (a Malone) to help the bowel empty [e6886-c29, e9506-c27]. Most children improve with these approaches; surgery to remove part of the colon is reserved for those who don't respond [e6886-c31, e6886-c32]. A team of specialists — surgeons, gut doctors, dietitians, nurses — works together to find what helps each child . The goal is a bowel that empties reliably, even if that means ongoing help rather than a cure .
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Every expert statement below comes from the recorded discussions, with its speaker and moment.
The Colorectal Quiz Episode 8: Motility Disorders Part 1
Failure of medical management is defined as appropriate treatment with no appropriate response
clinicalKahleb Graham2:51 ↗
Patients who cannot take treatment (e.g., kids with autism or other cognitive problems) are considered to have failed medical management
clinicalKahleb Graham3:04 ↗
Patients with persistent symptoms or pain with treatment, or failure to grow, are considered to have failed medical management
clinicalKahleb Graham3:04 ↗
Failure of retrograde enemas is considered failure of medical management
clinicalKahleb Graham3:21 ↗
Reliance on rectal therapy or retrograde enemas with continued soiling causing significant effect on functioning is considered failure of medical management
clinicalAnil Darbari3:35 ↗
General pediatricians typically prescribe osmotic laxatives (MiraLax, lactulose) and stimulant laxatives (Senna, bisacodyl), but there are other medications GI specialists use that pediatricians are not accustomed to prescribing
clinicalAnil Darbari3:57 ↗
Some children stool every day but don't completely evacuate
clinicalAnil Darbari4:58 ↗
Initial evaluation includes history (triggers, stooling frequency, sensation of complete emptying), physical exam (abdominal distension, palpable stool, rectal exam), and diagnostic imaging (abdominal X-ray, water-soluble contrast enema)
clinicalAnil Darbari4:46 ↗
In patients with long-standing constipation where appropriate treatments have been tried and failed, the first step is diagnostic studies including contrast enema to assess colonic dilation, redundancy, and ensure normal ratio
clinicalKahleb Graham5:27 ↗
Water-soluble contrast (not barium) is used for contrast enemas because it helps empty the colon and acts as a cleanout for patients starting new medical therapy
clinicalJason Frischer8:06 ↗
Contrast studies are not great predictors of how patients will respond to medical or surgical management; normal-looking colons may not respond while abnormal-appearing colons may respond well
clinicalJason Frischer7:12 ↗
The rectoanal inhibitory reflex (RAIR) is the response where the internal anal sphincter relaxes when the rectum becomes distended with stool
host_summaryRod9:11 ↗
Anorectal manometry uses a catheter with sensors measuring pressure and a balloon to assess anal sphincter function and its relationship to the rectum
clinicalAnil Darbari9:35 ↗
High pressures on anorectal manometry may suggest underlying inability to relax, causing a functional obstruction
clinicalAnil Darbari10:00 ↗
Patients with Hirschsprung disease have an absent rectoanal inhibitory reflex (RAIR)
clinicalAnil Darbari10:09 ↗
Anorectal manometry provides information about defecation dynamics by having patients bear down, squeeze, and attempt to defecate, comparing sensation to defecate with internal anal sphincter response
clinicalAnil Darbari10:19 ↗
Doctor Levitt states he doesn't know how he survived without anorectal manometry testing
opinionMarc Levitt10:47 ↗
In the past, surgeons did not understand the major role the sphincter played in many patients
opinionJason Frischer10:51 ↗
Colonic motility assessment is critical because in the past, colons or sigmoid colons were resected based on appearance, but patients had motility disorders and did not need resection
clinicalMarc Levitt7:36 ↗
Many dilated colons will respond to treatment
clinicalMarc Levitt7:54 ↗
Anorectal manometry is critical for determining whether a patient needs surgery or resection, as patients with motility disorders do not need surgery
host_summaryRod12:03 ↗
Colorectal Collaboration: Neurogastroenterology/Motility Disorders
Manometry is a catheter-based study of pressure changes within the lumen of the gut, involving visual pattern recognition of tracings to identify deviations from normal.
clinicalAjay Hall1:24 ↗
Colonic motility has four key components: diameter of the colon, tone, compliance of the colonic wall, and contraction pressures (how strong the contractions are).
clinicalAjay Hall1:34 ↗
In megacolon, tone and compliance are usually abnormal, but colonic manometry may still show normal high-amplitude propagated contractions and transit may be normal.
clinicalAjay Hall1:58 ↗
There are three types of constipation: normal transit constipation, slow transit constipation (problem with neuromuscular integrity of colonic wall), and outlet obstruction or withholding (most common in anorectal malformation children).
clinicalAjay Hall2:35 ↗
In a Sitz marker study, a patient should be able to pass all ingested radio-opaque markers in 5 days; markers remaining at 5 days indicate abnormal transit.
clinicalAjay Hall3:19 ↗
When Sitz markers are collected in the dilated rectum at 5 days, this is indicative of outlet obstruction or withholding.
clinicalAjay Hall3:48 ↗
When Sitz markers are scattered all over the colon at 5 days, this is indicative of slow transit constipation.
clinicalAjay Hall4:06 ↗
Scintigraphy studies colonic transit by tracking the geometric center of an ingested isotope and can identify specific colonic locations with transit issues.
clinicalAjay Hall4:15 ↗
The smart pill is a large capsule that measures pH, temperature, and pressure to assess transit from mouth to anus, but its size limits use to children approximately 10-12 years old or older.
clinicalAjay Hall4:51 ↗
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