Intestinal Rehabilitation, Episode 4: Surgical Management, Part 1

Published: 2022-10-07

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Intestinal Rehabilitation: From Crisis Management to Lifelong Care

Episode 4 of 13 in Intestinal Rehabilitation. The through-line across the whole series and where this episode fits in it. Written by Kai from every episode in the series and reviewed before publishing.

Series arc · AI-written, human-reviewed

The through-line

This eleven-episode series argues that intestinal failure in children is no longer a death sentence but a manageable chronic condition—provided the surgical, medical, and nutritional decisions made in the first hours and months are guided by an understanding of intestinal biology rather than visual assessment at laparotomy [e2p1-c23]. The series builds a case for conservative early management, aggressive enteral feeding, multidisciplinary coordination, and patience with the adaptive process [e1-c3]. Survival in major programs now exceeds 90%, and fewer than 2% of patients die from liver disease, yet the path from neonatal catastrophe to enteral autonomy depends on clinicians resisting the impulse to resect aggressively, predict outcomes prematurely, or intervene surgically without understanding what the next three operations will require [e2p2-c3][e4p1-c4].

The progression: from acute crisis to chronic optimization

Episodes 1–2: The foundational argument. The series opens by defining intestinal failure and rehabilitation as a coordinated, time-dependent process requiring enteral nutrition and measured in months to years [e1-c1][e3p1-c2]. Episode 2 immediately confronts the highest-stakes decision: what to do when a preterm infant's bowel appears dead at laparotomy. The answer—clinical observation over visual prediction—sets the tone for the entire series [e2p1-c24]. Helmrath introduces the 50% rule: focal necrosis under 50% of bowel length warrants resection for good adaptive potential, but diffuse necrosis over 50% demands proximal decompression and time [e2p1-c1][e2p1-c14]. The mechanism is liver protection through duodenal decompression, not salvage of questionable bowel [e2p1-c8]. Part 2 extends this to outcomes: ultra-short gut survival is 90–95%, and patients with remnant ileum or colon adapt better than expected [e2p2-c3][e2p2-c7]. The critical teaching is that the 30-week preterm gut has profound regenerative capacity if given luminal nutrition during the steepest growth period—35 weeks gestation to 6 months postnatal [e2p2-c4][e3p1-c23].

Episodes 3–4: The biology and mechanics of adaptation. Episode 3 shifts from crisis to biology. Adaptation is structural (mucosal hypertrophy, angiogenesis, bowel dilation) and functional (slowed motility, upregulated transporters), driven by intraluminal nutrients interacting with trophic peptides [e3p1-c3][e3p1-c4][e3p1-c5]. The ileum adapts better than jejunum because it produces GLP-2, GLP-1, and PYY, which slow motility and signal the liver [e3p1-c8][e3p1-c21]. The colon becomes critical when small bowel remnant falls below 50% of expected length, providing energy from short-chain fatty acids [e3p1-c27]. The new definition of enteral autonomy—independence from parenteral support for 12 weeks with adequate growth and hydration—reframes success around the child's biology, not the calendar [e3p1-c15][e3p2-c23]. Episode 4 translates this into surgical strategy. The STEP procedure works not by creating new bowel but by tapering dilated segments to restore motility [e4p1-c8][e4p2-c1]. Absorptive capacity improves over six months as inflamed mucosa heals [e4p2-c5]. The technical details matter—perpendicular staple lines, 2–2.5 cm caliber, crotch sutures, avoidance of duodenal stapling—but the philosophy matters more: surgery is a game of chess requiring planning two and three steps ahead, and the first operation in the first week of life has lifelong consequences [e4p1-c4][e4p2-c30].

Episode 5: Pharmacologic augmentation. The literature review on teduglutide introduces the only FDA-approved trophic peptide for children. At 0.05 mg/kg, 69% of patients achieved 20% TPN reduction and 10% discontinued TPN entirely [e5-c8][e5-c9]. The mechanism—improved fluid and electrolyte management at the epithelial layer despite GLP-2 receptors not being on enterocytes—underscores that adaptation is a systems problem, not a local one [e5-c17][e5-c18]. The drug requires enteral stimulation to work; the light switch is feeding, the dimmer is the hormone [e5-c13]. This episode also surfaces a recurring theme: fluid management, not calorie absorption, is often the limiting factor in weaning TPN [e5-c15][e5-c20].

Episodes 6–8: Managing complications and the long game. Episode 6 addresses cholestasis, historically a 25–50% mortality driver, now under 2% [e6-c5]. The shift reflects better lipid management (SMOF allows conventional dosing with hepatoprotection), aggressive enteral feeding, and recognition that a bilirubin of 2 mg/dL is transient and does not warrant intervention [e6-c11][e6-c14][e6-c18]. The teaching moment: after jejunostomy takedown, bilirubin and liver enzymes rise transiently as enterohepatic circulation resumes—this is normal, not failure [e6-c19][e6-c20]. Episodes 7 and 8 tackle refeeding in neonates and older children. The neonatal strategy is counterintuitive: high stoma output is an indication to feed, not withhold feeds, because damaged bowel transitions from secretory to absorptive phase only with luminal nutrition [e7-c2][e7-c3]. Breast milk is ideal, but the common mistake is isocaloric TPN reduction when advancing enteral feeds—children with sick intestines do not absorb all calories provided, and total volume may need to expand beyond 140 mL/kg [e7-c10][e7-c13]. For older children who lose bowel to volvulus, the challenge is maintaining nutrition through puberty when energy demands spike; some require temporary return to parenteral support, but marginal gut function often suffices once growth is complete [e8-c21][e8-c22][e8-c24].

The synthesis: what emerges from the whole

Three themes recur across the series, each building on the last. First, time is the variable clinicians control. The gut doubles in length between 35 weeks gestation and one year, and motility matures only with enteral feeding [e4p1-c5][e4p1-c6]. Surgical decisions that preserve bowel length and enable early feeding during this window determine whether a child reaches autonomy [e3p1-c32]. Second, the liver is the gatekeeper. Cholestasis, once a death sentence, is now a manageable complication, but only if duodenal decompression is achieved and enteral feeding is prioritized [e6-c21][e6-c9]. Third, motility trumps length. Very short bowel patients with excellent peristalsis can come off TPN; longer bowel with poor motility cannot [e4p1-c10]. This is why gastroschisis patients underperform despite adequate length—the enteric nervous system is damaged—and why NEC patients do better than expected—they were fed before injury, initiating motility [e4p1-c16][e4p1-c20].

The series also tracks an evolution in surgical philosophy. Early episodes emphasize what not to do: do not resect based on visual assessment, do not create stomas that lose abdominal domain, do not perform STEP in the first year if motility has not matured [e2p1-c23][e2p1-c18][e4p1-c19]. Later episodes shift to what to do: place a G-tube at the first operation for feeding versatility, use Blake drains for proximal decompression, plan staged procedures rather than attempting comprehensive repair [e7-c29][e2p1-c23][e4p2-c9]. The unifying principle is that intraoperative decisions have lifelong impact, and the surgeon's role is not to be the hero but to set up the next operation [e4p2-c30][e4p2-c29].

What the series does not cover

The series is silent on intestinal transplantation beyond acknowledging it as part of the continuum of care [e2p1-c2]. It does not address the psychosocial burden on families managing home TPN, central line care, or the transition to adult care. Neurocognitive outcomes are mentioned optimistically—most children are "running and playing"—but the series does not quantify deficits or explore educational support needs [e2p2-c12]. The role of the microbiome is acknowledged (shifts to acid-producing flora, bacterial overgrowth as a driver of staple-line ulcers) but not deeply explored [e3p1-c28][e4p2-c12]. Finally, the series does not grapple with resource disparities: the multidisciplinary model described requires subspecialty access, home nursing, and insurance coverage that many families lack.

The argument the series makes

Intestinal failure is a chronic disease of childhood, not an acute surgical problem. The first four months of life are when care is most uncoordinated and surgical decisions most consequential [e4p1-c4]. Success requires resisting the impulse to do everything at the first operation, trusting the regenerative capacity of the neonatal gut, feeding early and aggressively despite high output, protecting the liver through duodenal decompression, and planning surgeries in sequence rather than isolation. The outcome—over 90% survival, 60–80% enteral autonomy, normal growth in most—is achievable, but only if clinicians allow the child's clinical trajectory, not their visual assessment or institutional tradition, to guide care [e3p1-c19][e2p1-c24].

Inside this episode

Kai, the Library's AI content creator, listened to this episode and mapped who's speaking, the chapters, key claims, and cases. Every item links to the exact moment in the recording.

AI-enriched

Who's speaking

Ellen Ancisco — host
Tom Bash — host
Paul Wales — guest
Michael Helmrath — guest

Chapters

0:00Historical Context and Preoperative Philosophy — Introduction of speakers and discussion of Adrian Bianchi's pioneering work on longitudinal intestinal lengthening. Emphasis on multidisciplinary decision-making and the critical importance of the first four months of life and first year for intestinal maturation and motility development.
4:17Surgical Decision-Making at Birth — Discussion of surgeon's role at time zero for neonatal intestinal failure. Covers approaches to size discrepancy between bowel ends, including resection, tapering enteroplasty, and STEP procedure. Comparison of outcomes between atresia, gastroschisis, and necrotizing enterocolitis patients.
7:03Diagnosis-Specific Considerations — Detailed discussion of how underlying diagnosis affects surgical approach. Gastroschisis patients have inherent dysmotility and worse outcomes. Necrotizing enterocolitis patients do best, followed by atresia patients. Minimum bowel diameter of 5 cm required for STEP procedure.
10:45STEP Procedure Technical Details — Step-by-step description of the STEP procedure technique including patient positioning, bowel measurement, stapler selection (endo GIA with vascular/white load), perpendicular orientation at 90 and 270 degrees to mesentery, maintenance of 2-2.5 cm caliber, crotch suturing, and avoidance of duodenal stapling.
17:53Summary and Conclusion — Recap of key technical points and preview of part 2 covering family discussions, additional preoperative considerations, and postoperative outcomes with complications.

Key claims

1:23Adrian Bianchi first reported the longitudinal intestinal lengthening procedure (Bianchi procedure) that divides bowel along its two leaves and tubularizes it — Michael Helmrath
1:50In the 1980s and 1990s, babies with intestinal failure had poor outcomes primarily due to liver progression to inflammation and fibrosis associated with parenteral nutrition, lipids, and phytosterols — Ellen Ancisco
2:13Rising direct bilirubin was recognized as a sign that children with intestinal failure would not do well — Michael Helmrath
2:29The first 4 months of life is when care for intestinal failure patients is most uncoordinated and surgical decisions have the most profound effect on long-term outcome — Tom Bash
2:55The gut doubles in length during the last trimester and the first year of life — Michael Helmrath
2:58Intestinal maturation occurs when the baby is fed; healthy growth of the intestine requires nutrition — Michael Helmrath
3:06Disrupting the feeding and maturation process affects not only the intestine's ability to absorb and digest but also peristalsis and function — Michael Helmrath
3:32Absorptive surface area comes from the waves of peristalsis moving over the villi, not from the exposed length of bowel — Tom Bash
3:46Lengthening bowel that doesn't have peristalsis does not increase absorption; it's just more static water — Michael Helmrath
3:59Very short bowel children can sometimes come off TPN because their motility is so good — Michael Helmrath
4:18The majority of pediatric short bowel syndrome cases present at birth due to neonatal causes: congenital GI anomalies or acquired conditions like necrotizing enterocolitis — Paul Wales
5:42When reestablishing bowel continuity, size discrepancy between bowel ends must be addressed or a functional obstruction will result even if the anastomosis is patent — Paul Wales
6:02If adequate bowel length exists, size discrepancy can be managed by resection back to appropriate caliber or tapering enteroplasty — Paul Wales
6:28In short bowel cases, serial transverse enteroplasty (STEP) can address size discrepancy without resecting mucosa — Paul Wales
7:08Gastroschisis patients don't tend to do as well regardless of intervention; STEP procedures in gastroschisis patients consistently underperform — Paul Wales
7:21Gastroschisis patients have inherent dysmotility from enteric nervous system damage due to amniotic fluid exposure — Tom Bash
7:32The enteric nervous system in gastroschisis must go through a healing and recovery phase that is attenuated by dysmotility and stasis — Michael Helmrath
7:55Atresia patients may have good peristalsis from bowel working against obstruction, and longitudinal stapling procedures may benefit them — Michael Helmrath
8:19Children who undergo STEP procedures in the first year of life sometimes never progress and are labeled as poor motility patients unable to tolerate enteral feeds — Michael Helmrath
8:40Necrotizing enterocolitis patients do better than other intestinal failure etiologies because they have been fed before disease onset, initiating GI motility and maturation — Michael Helmrath
9:09STEP procedure requires bowel diameter of at least 5 centimeters to be worthwhile — Paul Wales
9:36At birth, neonatal bowel is usually not dilated enough to apply the STEP procedure — Ellen Ancisco
9:50In scenarios where immediate anastomosis is not prudent, distal bowel can be accessed with a feeding tube to provide distal feeding and grow the bowel in caliber before a subsequent operation — Paul Wales
10:22Stepping the duodenum in non-rotated children is fraught with problems and causes significant issues later in life — Michael Helmrath
10:45The STEP procedure was originally described by HP Kim and Tom Jackson — Paul Wales
11:29Maintaining bowel alignment during STEP is critical; there is risk of longitudinal twisting if alignment is not maintained — Paul Wales
12:26An endo GIA stapler with vascular (white) load cartridge (2.5mm crimping to 1mm) is preferred over open GIA and prevents leaks better than the classic blue load — Paul Wales
13:23Target bowel caliber after STEP is 1.5 cm in babies and 2 to 2.5 cm in older infants or children — Paul Wales
13:36Making the bowel too narrow during STEP can cause obstruction, especially in patients with borderline motility — Paul Wales
14:35A U-stitch with 4-0 PDS should be placed in the crotch of each staple line to prevent potential leaks — Paul Wales
15:08Dog ears (blind loops) can form at the top and bottom of the STEP segment where bowel transitions in and out, and these can dilate over time — Paul Wales
15:52Dilated segments in STEP can allow the stepped segments to rotate away from each other and twist, forming a functional obstruction — Ellen Ancisco
12:34STEP staple lines should be oriented perpendicular to the mesentery at 90 and 270 degrees (3 o'clock and 9 o'clock positions) — Paul Wales
16:51The duodenum should not be stepped; STEP should start where the bowel begins to dilate, usually distal to the duodenum — Paul Wales
17:20If duodenal narrowing is needed, a stapler should be used on the lateral side away from the bile duct and ampulla; plication sutures usually fail — Paul Wales
17:32The duodenum has no mesentery, making it impossible to orient staple lines at 3 and 9 o'clock positions as in the jejunum — Michael Helmrath

Open questions

Should lengthening procedures be performed at birth or delayed until after the first year of life when intestinal maturation is complete?
What is the optimal timing for STEP procedure in gastroschisis patients given their inherent dysmotility?
Can children labeled as 'poor motility' after early STEP procedures recover function if given more time for enteric nervous system maturation?

This episode was analyzed and enriched by Kai, the Library's AI content creator. Every item links to the moment it comes from — click a timestamp to listen in context.

Written for:

Surgical Timing and Technique in Neonatal Intestinal Failure

The episode's teaching points arranged as a structured lesson, building from the basics up to the finer points. Written by Kai from the episode transcript and reviewed before publishing.

For the care team · Teaching arc · AI-written, human-reviewed

The first year of life is when the gut doubles in length and the enteric nervous system matures — but only if the infant is fed 2:55 2:58. Any disruption to this feeding-dependent maturation affects not just absorption but peristalsis itself 3:06. The decision to operate during this critical window carries consequences measured in decades, not months.

Motility determines absorptive capacity, not length. The intestine functions like an ocean: absorption comes from waves of peristalsis moving nutrients over villi, not from static exposed surface area 3:32. Lengthening bowel that lacks peristalsis accomplishes nothing — it is "just more static water" 3:46. This explains why some very short bowel patients with excellent motility can discontinue TPN while others with longer segments and poor motility cannot 3:59. Any surgical intervention that worsens motility during the first year — when the enteric nervous system is still developing — may permanently impair function 2:29.

Size discrepancy at anastomosis creates functional obstruction even when the connection is patent. When reestablishing bowel continuity, the diameter mismatch between proximal and distal segments must be addressed or peristalsis will not propagate effectively 5:42. The approach depends on available length: if bowel is adequate, resect back to matching caliber or perform tapering enteroplasty 6:02. If bowel is critically short, serial transverse enteroplasty (STEP) can narrow the proximal segment without sacrificing mucosa 6:28.

Underlying diagnosis predicts outcome independent of technique. Necrotizing enterocolitis patients have the best prognosis because they were fed before disease onset — the maturation phase was already initiated 8:40. Atresia patients are intermediate; their bowel may have good peristalsis from working against obstruction, and longitudinal stapling procedures may benefit them 7:55. Gastroschisis patients consistently underperform regardless of intervention 7:08. The enteric nervous system in gastroschisis is damaged by amniotic fluid exposure and must undergo a prolonged healing phase that is attenuated by dysmotility and stasis 7:21 7:32. Operating early on gastroschisis patients — particularly with procedures that may worsen motility — should be approached with caution.

STEP requires adequate dilation and precise execution. The procedure is not worthwhile unless bowel diameter reaches at least 5 centimeters 9:09. At birth, neonatal bowel is rarely dilated enough 9:36. In cases where immediate anastomosis is not prudent, distal bowel can be accessed with a feeding tube to provide distal feeds and allow the bowel to grow in caliber before a subsequent operation 9:50. During the procedure, staple lines must be oriented perpendicular to the mesentery at 90 and 270 degrees (3 and 9 o'clock positions) 12:34. Maintaining bowel alignment throughout is critical — longitudinal twisting will occur if alignment is lost 11:29. Target caliber is 1.5 cm in babies and 2 to 2.5 cm in older infants; making the bowel too narrow causes obstruction, especially in patients with borderline motility 13:23 13:36.

Dog ears at transition points lead to delayed obstruction. At the top and bottom of the STEP segment, sharp corners can form blind loops that dilate over time 15:08. These dilated segments allow the stepped portions to rotate away from each other and twist, creating functional obstruction 15:52. Oblique tapering at entry and exit points prevents this complication.

The duodenum should not be stepped. The duodenum lacks a mesentery, making it impossible to orient staple lines at the 3 and 9 o'clock positions used in the jejunum 17:32. STEP should begin where bowel dilates distal to the duodenum 16:51. If duodenal narrowing is necessary, use a stapler on the lateral side away from the bile duct and ampulla — plication sutures fail 17:20. Stepping the duodenum in non-rotated children causes significant long-term problems 10:22.

Surgical Timing and Technique in Neonatal Intestinal Failure

The episode's teaching points arranged as a structured lesson, building from the basics up to the finer points. Written by Kai from the episode transcript and reviewed before publishing.

For specialists · Teaching arc · AI-written, human-reviewed

Motility determines absorptive capacity, not bowel length

The fundamental error in early intestinal lengthening procedures was the assumption that more exposed mucosal surface meant more absorption. The intestine functions like an ocean: absorptive capacity comes from waves of peristalsis moving nutrients over villi, not from static exposed bowel 3:32. This is why very short bowel patients with excellent motility can achieve enteral autonomy while longer bowel with poor peristalsis cannot 3:59. Lengthening bowel that lacks coordinated peristalsis produces "more static water" — increased length without functional benefit 3:46. Any surgical intervention must be evaluated not just for its effect on length but for its impact on the developing enteric nervous system.

The first year of life is the critical window for intestinal maturation

The gut doubles in length during the last trimester and first year of life, and this maturation requires enteral feeding 2:55 2:58. Disrupting this process affects not only absorption and digestion but peristalsis itself 3:06. The first four months carry the highest risk: care is most uncoordinated and surgical decisions have the most profound effect on long-term outcome 2:29. A child who undergoes STEP in the first year sometimes never progresses and becomes labeled as a "poor motility" patient unable to tolerate feeds 8:19. The question is not whether a lengthening procedure is technically feasible at birth, but whether performing it during the critical maturation window will permanently impair motility development. The outcome should benefit the child for 80 to 90 years, not just the next two months [q2].

Diagnosis predicts response to surgical intervention

Necrotizing enterocolitis patients have the best outcomes because they were fed before disease onset — the maturation phase and GI motility were already initiated 8:40. Atresia patients may have good peristalsis from bowel working against obstruction, and longitudinal stapling procedures may benefit them 7:55. Gastroschisis patients consistently underperform regardless of intervention 7:08. The enteric nervous system in gastroschisis is damaged by amniotic fluid exposure, creating inherent dysmotility 7:21. These patients must go through a healing and recovery phase that is attenuated by further dysmotility and stasis 7:32. Any intervention that worsens motility in gastroschisis — especially in the first year of life — should be strongly reconsidered.

Size discrepancy must be addressed or functional obstruction will result

When reestablishing bowel continuity, a patent anastomosis is insufficient if the proximal and distal ends differ significantly in caliber 5:42. Even with a technically successful connection, functional obstruction occurs. The approach depends on available bowel length: if adequate length exists, resect back to appropriate caliber or perform tapering enteroplasty 6:02. In short bowel cases, STEP can address size discrepancy without resecting mucosa 6:28. In scenarios where immediate anastomosis is not prudent, access the distal bowel with a feeding tube to provide distal feeding and grow the bowel in caliber before a subsequent operation 9:50.

STEP requires adequate dilation and precise technique to avoid complications

The procedure requires bowel diameter of at least 5 centimeters to be worthwhile 9:09. At birth, neonatal bowel is usually not dilated enough 9:36. Staple lines must be oriented perpendicular to the mesentery at 90 and 270 degrees (3 and 9 o'clock positions) 12:34. Maintaining bowel alignment during the procedure is critical — longitudinal twisting can occur if alignment is not maintained 11:29. Target caliber after STEP is 1.5 cm in babies and 2 to 2.5 cm in older infants or children 13:23. Making the bowel too narrow causes obstruction, especially in patients with borderline motility 13:36. Dog ears (blind loops) can form at transition points where bowel enters and exits the STEP segment, and these dilate over time 15:08. Dilated segments allow the stepped portions to rotate away from each other and twist, forming functional obstruction 15:52.

The duodenum should not be stepped

The duodenum lacks a mesentery, making it impossible to orient staple lines at the 3 and 9 o'clock positions as in the jejunum 17:32. STEP should start where the bowel begins to dilate, usually distal to the duodenum 16:51. If duodenal narrowing is needed, use a stapler on the lateral side away from the bile duct and ampulla — plication sutures usually fail 17:20. Stepping the duodenum creates unpredictable staple line orientation and significant long-term problems 10:22.

Takeaways from this story

Absorptive capacity depends on peristaltic waves over villi, not exposed bowel length—lengthening bowel without motility produces no benefit.
STEP in the first year can permanently impair motility development; surgical timing must consider the 80-year outcome, not just immediate needs.
Gastroschisis patients have inherent dysmotility from amniotic fluid damage and consistently underperform after STEP regardless of technique.
Size discrepancy between bowel ends causes functional obstruction even with patent anastomosis—must resect, taper, or STEP based on available length.
STEP requires 5cm dilation and staple lines at 3 and 9 o'clock; the duodenum lacks mesentery and should not be stepped.

Surgical Judgment in Neonatal Intestinal Failure: When Lengthening Helps and When It Harms

The episode's teaching points arranged as a structured lesson, building from the basics up to the finer points. Written by Kai from the episode transcript and reviewed before publishing.

For the care team · Teaching arc · AI-written, human-reviewed

Motility determines absorptive capacity, not exposed length

The fundamental insight reshaping surgical decision-making in intestinal failure is that absorption depends on peristaltic waves moving nutrients across villi, not on the linear measurement of bowel 3:32. "The intestine is like the ocean. It's the waves coming in and out over the villa that give you absorptive surface area, not the length, exposed area of the bowel" 3:32. This explains the clinical paradox: very short bowel patients with preserved motility can achieve enteral autonomy, while patients with longer but dysmotile segments remain TPN-dependent 3:59. Lengthening bowel that lacks peristalsis creates more static surface area without increasing function — "just more static water" 3:46. The implication for surgical planning is that any intervention risking further motility impairment may worsen outcomes despite increasing anatomic length.

The first year is the critical window for enteric nervous system maturation

The gut doubles in length during the last trimester and first year of life, and this maturation process requires enteral feeding 2:55 2:58. Anything disrupting feeding during this period affects not only absorptive capacity but also the development of coordinated peristalsis 3:06. The first four months carry the highest risk: care is most fragmented, and surgical decisions have disproportionate impact on lifelong function 2:29. A child who undergoes lengthening procedures in the first year and never advances feeds may be permanently labeled as having poor motility, when the intervention itself may have arrested normal enteric nervous system development 8:19. The surgical question is not whether a lengthening procedure is technically feasible at birth, but whether it preserves or compromises the developmental trajectory that unfolds over the subsequent twelve months.

Diagnosis predicts motility potential and guides intervention timing

Necrotizing enterocolitis patients have the best prognosis because they were fed before disease onset — the enteric nervous system has already begun its maturation phase 8:40. Atresia patients occupy middle ground: their bowel may have developed good peristalsis from working against obstruction, and longitudinal stapling procedures may benefit them 7:55. Gastroschisis patients have the worst outcomes regardless of intervention 7:08. The enteric nervous system sustains damage from amniotic fluid exposure, and the subsequent healing phase is attenuated by dysmotility and stasis 7:21 7:32. STEP procedures in gastroschisis patients consistently underperform 7:08. The diagnosis should shape not only whether to intervene but when: procedures that might benefit an atresia patient could permanently impair a gastroschisis patient if performed during the critical first year.

Size discrepancy must be addressed or anastomosis will fail functionally

When reestablishing bowel continuity, a patent anastomosis between ends of disparate diameter will result in functional obstruction even if technically intact 5:42. The approach depends on available length: if bowel is adequate, resect back to appropriate caliber or perform tapering enteroplasty 6:02. If bowel is short, STEP addresses size discrepancy without sacrificing mucosa 6:28. The procedure requires bowel diameter of at least 5 centimeters to be worthwhile 9:09, which neonatal bowel typically lacks at birth 9:36. In scenarios where immediate anastomosis is not prudent, access the distal bowel with a feeding tube to provide distal feeds and grow the bowel in caliber before a subsequent operation 9:50.

Technical precision in STEP prevents late mechanical complications

Maintaining bowel alignment during STEP is critical — longitudinal twisting can occur if alignment is lost 11:29. Staple lines must be oriented perpendicular to the mesentery at 90 and 270 degrees (3 and 9 o'clock positions) 12:34. Target caliber is 1.5 cm in babies and 2 to 2.5 cm in older children 13:23; making the bowel too narrow causes obstruction, especially in patients with borderline motility 13:36. Dog ears — blind loops at transition points into and out of the STEP segment — can dilate over time 15:08. These dilated segments allow the stepped portions to rotate away from each other and twist, forming functional obstruction 15:52. Oblique tapering at the top and bottom of the STEP segment prevents this complication.

The duodenum should not be stepped

The duodenum lacks a mesentery, making it impossible to orient staple lines at the 3 and 9 o'clock positions as in the jejunum 17:32. STEP should begin where bowel dilates, typically distal to the duodenum 16:51. Stepping the duodenum creates unpredictable staple line orientation and significant long-term problems 10:22. If duodenal narrowing is necessary, use a stapler on the lateral side away from the bile duct and ampulla; plication sutures typically fail 17:20.

Takeaways from this story

Absorption depends on peristaltic waves over villi, not bowel length—lengthening dysmotile bowel adds static surface without function.
The first year is critical for enteric nervous system maturation; interventions during this period can permanently impair motility development.
Gastroschisis patients have inherent dysmotility from amniotic fluid exposure; STEP procedures consistently underperform in this population.
Size-mismatched anastomoses cause functional obstruction even if patent; address discrepancy by resection/tapering if length adequate, STEP if short.
Dog ears at STEP transition points dilate over time, allowing stepped segments to rotate and twist—oblique tapering at entry/exit prevents this.

The Dilated Duodenum: When a Standard Operation Fails Before It Starts

A dramatized three-act script built from this episode's case. The trainee character is fictional; every medical statement is spoken by the real expert from the episode. Written by Kai from the episode transcript and reviewed before publishing.

For the care team · Case Chronicles · AI-written, human-reviewed

*A fellow must decide whether to proceed with a lengthening procedure in a newborn with gastroschisis and massive bowel dilation—knowing the diagnosis predicts failure.*

> Dramatized composite. The clinical content is drawn from this episode and every clinical statement is attributed and cited. The patient and the trainee are composites; no real patient is depicted.

Act 1

NARRATOR: Day four. The baby with gastroschisis is stable enough for anastomosis. The proximal bowel is massively dilated. The distal limb is thread-thin.

FELLOW: We could do a STEP. Get length, address the size mismatch, reconnect everything in one operation.

NARRATOR: Her attending, Dr. Paul Wales at Cincinnati Children's, measures the dilated segment. More than adequate for the procedure.

EXPERT: I don't usually do that operation unless the bowel is at least five centimeters dilated. This qualifies.

FELLOW: So we proceed?

EXPERT: In general, gastroschisis patients don't tend to do as well regardless. If I look at the STEP procedures I've done over the years, the ones that consistently underperform are always the gastroschisis cases.

*— Why does the same operation fail in gastroschisis when the anatomy looks perfect for it?*

Act 2

NARRATOR: Maya pulls the literature. STEP works by creating a narrower, longer channel—more surface area for absorption. But Dr. Michael Helmrath, also at Cincinnati, frames it differently.

EXPERT: The intestine is like the ocean. It's the waves coming in and out over the villi that give you absorptive surface area, not the exposed length of bowel.

EXPERT: Lengthening bowel that doesn't have peristalsis doesn't increase absorption—that's just more static water.

FELLOW: So it's the motility, not the length.

EXPERT: Gastroschisis patients have inherent dysmotility from enteric nervous system damage due to amniotic fluid exposure. That nervous system has to go through a healing and recovery phase that's attenuated by dysmotility and stasis.

NARRATOR: He shows her the contrast study from a previous gastroschisis STEP. The stepped segments are there—perfectly narrowed, beautifully lengthened. Not moving.

EXPERT: I've seen many children with a first operation that included STEP in the first year of life who never progress and are labeled poor motility patients unable to tolerate enteral feeds.

FELLOW: What if we wait? Let the nervous system recover first?

EXPERT: The gut doubles in length during the last trimester and the first year of life. That maturation occurs when you feed the baby—healthy growth of the intestine requires nutrition.

EXPERT: Anything that disrupts feeding affects not only absorption but peristalsis and function.

*— If STEP now risks permanent dysmotility, but waiting sacrifices the critical growth window—what do you do?*

Act 3

NARRATOR: They choose a third path. Wales resects the most dilated proximal segment back to healthier caliber and performs a tapering enteroplasty—narrowing without the perpendicular staple lines of STEP.

EXPERT: When adequate bowel length exists, size discrepancy can be managed by resection back to appropriate caliber or tapering enteroplasty. We're not resecting mucosa, but we're dealing with the size mismatch.

NARRATOR: He places a feeding tube into the distal limb before closing.

EXPERT: In scenarios where immediate anastomosis isn't prudent, distal bowel can be accessed with a feeding tube to provide distal feeding and grow the bowel in caliber before a subsequent operation.

FELLOW: We come back in six months?

EXPERT: If the motility recovers and the distal bowel grows, we reassess. The outcome should benefit the child for eighty or ninety years, not just the next two months.

NARRATOR: Three weeks later, the baby tolerates trophic feeds through the tube. The proximal stoma output is falling. Maya checks the contrast study—peristaltic waves, finally visible, moving down the tapered segment.

FELLOW: The ocean is waking up.

Takeaways from this story

Intestinal absorption depends on peristaltic waves over villi, not static bowel length—motility trumps anatomy.
Gastroschisis causes enteric nervous system damage from amniotic fluid exposure, leading to inherent dysmotility.
STEP procedures in gastroschisis consistently underperform; staged approaches may preserve the critical first-year maturation window.
Distal feeding via tube can grow bowel caliber between operations, buying time for nervous system recovery.

Surgical Timing and Technique in Neonatal Intestinal Failure

The episode's teaching points arranged as a structured lesson, building from the basics up to the finer points. Written by Kai from the episode transcript and reviewed before publishing.

For trainees · Teaching arc · AI-written, human-reviewed

Foundation: Motility Determines Absorption, Not Length

The intestine functions like an ocean — absorption comes from waves of peristalsis moving nutrients over villi, not from static exposed surface area 3:32. This explains the counterintuitive clinical observation that very short bowel patients with excellent motility can wean from parenteral nutrition while patients with longer segments and poor peristalsis cannot 3:59. Lengthening bowel that lacks peristalsis adds only "more static water" — it does not increase functional absorption 3:46. This principle should govern every surgical decision in intestinal failure: preserve and promote motility above all else.

The Critical Window: First Year Maturation

The gut doubles in length during the last trimester and first year of life, and this maturation process requires enteral feeding 2:55 2:58. Healthy intestinal growth depends on nutrition passing through the lumen. Any disruption to feeding during this period affects not only absorptive capacity but also peristalsis development and long-term function 3:06. The first four months of life represent the period when surgical decisions have the most profound effect on long-term outcome 2:29. An intervention that impairs motility development during this window can label a child as "poor motility" for life — a designation that may reflect iatrogenic damage rather than intrinsic disease 8:19.

Diagnosis-Specific Prognosis

Necrotizing enterocolitis patients do better than other etiologies because they have been fed before disease onset, initiating gastrointestinal motility and turning on the maturation phase 8:40. The enteric nervous system has already begun developing normally. Atresia patients occupy the middle ground — their bowel may have good peristalsis from working against obstruction, and longitudinal stapling procedures may benefit them if performed correctly 7:55. Gastroschisis patients consistently underperform regardless of intervention 7:08. They have inherent dysmotility from enteric nervous system damage caused by amniotic fluid exposure 7:21. The nervous system must undergo a healing and recovery phase that is attenuated — not enhanced — by further stasis and dysmotility 7:32. Any procedure that worsens motility in a gastroschisis patient during the first year should be approached with extreme caution.

Size Discrepancy: The Non-Negotiable Problem

When reestablishing bowel continuity, a patent anastomosis is insufficient — if the proximal and distal ends differ significantly in diameter, functional obstruction will result even with a technically perfect connection 5:42. The approach to size discrepancy depends on available bowel length. If adequate length exists, resect back to appropriate caliber or perform tapering enteroplasty 6:02. In short bowel cases, serial transverse enteroplasty (STEP) addresses size discrepancy without sacrificing mucosa 6:28. The procedure requires bowel diameter of at least 5 centimeters to be worthwhile 9:09. At birth, neonatal bowel is usually not dilated enough for STEP 9:36. In such cases, access the distal bowel with a feeding tube to provide distal feeding and grow the bowel in caliber before a subsequent operation 9:50.

Technical Precision in STEP

Maintain alignment throughout the procedure — longitudinal twisting of the bowel is a real risk if orientation is lost 11:29. Mark the anti-mesenteric surface with surgical pen before beginning. Orient staple lines perpendicular to the mesentery at 3 and 9 o'clock positions 12:34. Use an endo GIA stapler with vascular (white) load cartridge, which crimps to 1mm and prevents leaks better than the classic blue load 12:26. Target caliber is 1.5 cm in babies and 2 to 2.5 cm in older infants 13:23. Making the bowel too narrow causes obstruction, especially in patients with borderline motility 13:36. Place a U-stitch with 4-0 PDS in the crotch of each staple line to prevent leaks 14:35.

Prevent dog-ear formation at transition points. At the top and bottom of the STEP segment, sharp corners can form blind loops that dilate over time 15:08. These dilated segments allow the stepped bowel to rotate and twist, forming functional obstruction 15:52. Fire an additional cartridge obliquely at transitions to taper the bowel into the stepped segment rather than creating a sharp angle.

The Duodenum: Where STEP Should Not Go

The duodenum lacks a mesentery, making it impossible to orient staple lines at 3 and 9 o'clock as in the jejunum 17:32. Stepping the duodenum leads to unpredictable staple line orientation and significant long-term problems 10:22. Begin STEP where the bowel starts to dilate, usually distal to the duodenum 16:51. If duodenal narrowing is necessary, use a stapler on the lateral side away from the bile duct and ampulla — plication sutures typically fail 17:20.

Takeaways from this story

Intestinal absorption depends on peristaltic waves over villi, not bowel length—preserve motility above all else.
First-year surgical interventions can permanently impair motility development during the critical maturation window.
Gastroschisis patients have inherent dysmotility from enteric nervous system damage and consistently underperform.
Size-mismatched anastomoses cause functional obstruction even when patent—address discrepancy based on available length.
STEP staple lines must be perpendicular to mesentery at 3 and 9 o'clock; the duodenum lacks mesentery and should not be stepped.

Topic overview

This discussion covers surgical management of pediatric intestinal failure, focusing on the serial transverse enteroplasty (STEP) procedure. The speakers emphasize that successful outcomes depend on preserving intestinal motility during the first year of life when the gut doubles in length and the enteric nervous system matures. Key technical points include maintaining bowel caliber of 2-2.5 cm, avoiding duodenal stapling, and preventing dog-ear formation at transition points. Gastroschisis patients have inherently worse outcomes due to dysmotility from amniotic fluid exposure, while necrotizing enterocolitis patients tend to do best because feeding has already initiated motility maturation before disease onset.

Key takeaways

Preserve motility in year 1: gut doubles in length and enteric nervous system matures when fed—disruption impairs peristalsis long-term. (2:55)
STEP requires ≥5cm bowel diameter; target 1.5cm (babies) or 2–2.5cm (older). Too narrow causes obstruction in borderline motility patients. (9:09)
Never step the duodenum—no mesentery prevents proper staple orientation; causes significant long-term problems. (10:22)
Gastroschisis patients underperform after STEP due to amniotic fluid–induced enteric nervous system damage and inherent dysmotility. (7:08)
NEC patients do best: feeding before disease onset initiates GI motility maturation. Peristalsis over villi drives absorption, not length alone. (3:32)

Keywords

intestinal failure short bowel syndrome necrotizing enterocolitis gastroschisis intestinal atresia liver failure dysmotility functional obstruction serial transverse enteroplasty (STEP) Bianchi procedure longitudinal intestinal lengthening tapering enteroplasty bowel resection intestinal transplantation exploratory laparotomy

Hashtags

#IntestinalRehabilitation #ShortBowelSyndrome #PediatricSurgery #IntestinalFailure

Transcript

Click "Show Transcript" to view the full text (19373 characters)

All right. Hi, everyone. We're back with another episode of a series we started before on intestinal rehabilitation. I'm Ellen Ancisco and I'm I'm Tom Bash. We're research fellows at Cincinnati Children's Hospital Medical Center. And we're doing this series with two of the surgical experts in intestinal rehabilitation at Cincinnati Children's Hospital. Medical Center. We have the surgical director of the intestinal rehab program. I'm Paul Wales. I'm a pediatric surgeon here at Cincinnati Children's Hospital, and we have the former surgical director of the intestinal rehab program. I'm Michael Helmrath. I'm a pediatric surgeon also doing intestinal failure surgery and research here at Cincinnati Children. So, today's topic took some buildup to get here, to get to talk about the operative steps of the lengthening procedures. But that's what we're gonna talk about today. We're gonna talk about the operative management for patients with intestinal failure. Um, so to start out, we asked Doctor Helmrath and Doctor Wales what are some of the preoperative considerations or things that we should think about when we're planning an operation for a patient with intestinal failure. I think it's important. As a surgeon to understand history. A lot of our history with intestinal failures go back, I think, to Adrian Bianchi, who first reported doing what he called a Bianchi procedure, but it's a longitudinal intestinal lengthening procedure that he would use to divide the bowel, given the opportunity that the bowel has two leaves to it. He would tubularize it, and we can talk a lot about that a little bit more. I think it's really important to understand the natural history of why that was being done. And so in the 80s and 90s, babies with intestinal failure really weren't making it, mostly because the liver was progressing to a state of inflammation and fibrosis associated with the way that we were Providing nutrition through parenteral uh nutrition, lipids, and phytosterols, according to Doctor Helmrath. And the rest of the time was to avoid that liver failure, but maybe bridge to a transplantation and to buy time. One of the first things that he and many others recognized that a rising direct bilirubin was a sign for these kids who are not going to do well. And so the goal there was to try to do interventions that would prevent that from happening. Adrian Bianchi recognized that the 1st 4 months of life is when care for these kids is most uncoordinated, and decisions made by surgeons are the most profound effect in the long-term outcome, and this is what really led to our understanding of multidisciplinary teams. And Doctor Helmrath mentioned a review that Bianchi did in the past. It's linked below in the media player. I want. People to go back and to recognize what we talked about before. The gut doubles in length the last trimester in the first year of life. That maturation process occurs when you feed the baby. Healthy growth of the intestine requires nutrition. Anything you do to disrupt that affects the maturation, not of the ability only of the intestine to absorb and digest, but the peristals and to function. Overall, the decision to operate is a multidisciplinary question, and it's patients. Specific. The outcome is one that should benefit the child for 80, 90 years, not just the next 2 months. And so Doctor Helmer's question is, do you do these innovative procedures initially at birth? That takes discussion. Doctor Halma says the intestine is like the ocean. It's the waves coming in and out over the villa that give you absorptive surface area, not the length, exposed area of the bowel that gets these kids off of nutrition of TPN. The better the waves going over the villa, The more exposure of nutrients and removal of waste that you have is not increased by lengthening the bowel that doesn't peristals. That's just more static water. So, that's why we see very short bowel kids sometimes come off a TPM because their motility is so good. So, we don't want to affect this developmental motility, which happens in the first year of life by undergoing procedures or having recurrent infections or other things that can be detrimental to the developmental process of the. Intestine. The point of intake for the majority of this population talking about short bowel syndrome is at birth because the etiologies for pediatrics are usually neonatal causes. That was Dr. Paul Well. He's the current surgical director of the intestinal rehabilitation program at Cincinnati Children's. So congenital anomalies of the GI tract or acquired conditions like necrotizing enterocolitis. So, the surgeon is involved at time 0 like that. Many times those procedures are done under their emergencies. So making rational decisions at that initial surgery will set that baby up for success or failure. These kids, as they adapt and evolve, will often require adjunctive procedures to optimize their anatomy to try to maximize their abortive potential. So we have a role to intervene at the right time to try to optimize things so that they continue to progress in a positive way. And then at the end of the road, if they happen to fail, then the surgeon has a role as well in the consideration for transplantation. So the surgeon has a vital presence in the natural history of these patients. So what Operating on a new baby, do we lengthen that bowel at that time and do a primary anastomosis of the colon? Do we bring out a stoma? Does it matter if that was a kid that had, what is the considerations that you make, or should we taper it? If you are thinking of reestablishing continuity, I feel very strongly that you have to deal with the size discrepancy. So you can put the two ends of the bowel together, but if they're quite disparate in diameter, then even if it's patent, it won't work. They'll end up with a functional obstruction. I approached the question, how do you deal with the size discrepancy. In very simplistic terms, if the person feels that they have adequate length overall, then your way of dealing with the size discrepancy could involve resection. And back to an area that is more caliber, that's more appropriate to the distal end, or you could taper the proximal end either with a tapering enteroplasty and then do an anastomosis, for instance. Or in the case of what you consider to be short, you could deal with the disparity in diameter by doing a serial transverse enteroplasty. That way, you're not resecting any mucosa, but you're dealing with the size discrepancy. So, in other words, how you deal with the size discrepancy Ends of bowel that you're trying to put back together depends on how much bowel you have. If you have enough bowel, you might reset to the point that the two ends match better and maybe taper the proximal end. Or if there's not enough bowel, a lengthening procedure such as the step procedure may be used. Take a look at the image below the media player to see an illustration of the step procedure. Talk to me about diagnosis. Difference between atresia and gastroschisis. How does that play in your decision? In general, gastroschisis, they don't tend to do as well regardless. If, and if I look at the step procedures that I've done over the years, the ones that tend to not do as well or tend to always be the gastroschisis. Patients with gastroschisis seems to just have this inherent dysmotility. The gastroschisis ones with or without aresia. So I find that the operation just doesn't work as well anyway. I think it goes back that the enteric nervous system is damaged to the extent in gastroschisis from the exposure to amniotic fluid and Has to go through a healing and a recovery phase which is different than some of the other populations of kids that we, we see. And I think when exposed to more dysmotility and more stasis, that regeneration and healing is attenuated, is not enhanced. Whereas on the other side, a baby that just has a straight up atricia, that bowel may have really good peristalsis and has been working against an obstruction, and that when done correctly and oriented, a longitudinal. Stapling a procedure may actually benefit that child very well. The question that Doctor Helmuth has, does that have to be done at birth or can it be done after their first year of life? I have seen many a child with a first operation at that time that included steps that have just never gone forward and then have been labeled a poor motility child and accepted to not be able to tolerate enteral feeds, which I have challenges with. If Doctor Helmuth. had to pick a child with a limited amount of gut to take care of. His first choice would be a baby with necrotizing enterocolitis. They just do better when they heal. Most of them because they've been fed before. They already have geo immertility starting. That maturation phase has already been turned on because they didn't get neck the day they were born. Tresia's 2, and I run from gastroschisis. Anything that creates a potential worsening of motility and gastroschisis, especially in the first year of. Life should be something you should strongly think about before doing. As far as decision making, and I don't usually do that operation anyway unless the bowel is an adequate diameter to make it worthwhile, and in my head over the years, it's always been about 5 centimeters anyway. The whole thing about gaining length is really dependent on the diameter of the bowel that you start with, and the width at which you make the cuts with the stapler. And if someone's not dilated enough, the procedure won't really be possible. Usually at birth, they're just not dilated enough to apply the step procedure. I would tend to either resect the bulbs and do a tapering enteroplasty. And if I can establish continuity at that time, I will. But there are scenarios where it may be more prudent to not connect it and to get access to the distal bowel, especially if it's really small, with a feeding tube to provide access for distal feeding and come back another day to establish continuity and use that time to grow the distal. Bowel and caliber to make that next operation better. So I want you, Paul, to describe to the listeners how you do a step, because there's different orientations that people use, and I think that they've contributed to some of the complications. And I also want you to talk about the difference between a non-rotated child where people will do a step all the way up on the duodenum, and it's even written that you can step the duodenum, which I think is fraught with problems and. Gives us a huge amount of issues later in life versus the kid that is normally rotated, how you approach the duodenum when it's non-rotated and when do you stop. I basically performed the operation the way it was originally described by HP Kim and Tom Jackson, and they really deserve all the credit. Basically, for a standard neonatal approach for me for an exploratory laparotomy is a transverse abdominal incision, super umbilical. So first, Doctor Wells gets into the abdomen and lics any adhesions. I like to lay out the whole intestinal tract from top to bottom. I find that it helps me understand exactly what we're dealing with and gives me sort of maximum mobility. And I also find it easier that way rather than just exposing the limited part that you think you want to work with. He measures the whole bowel before and after because it's critical to record and on the. you're dealing with. So I like to lay out the whole intestine. Once all the adhesions are liced, I use a surgical pen to mark the anti-mesenteric surface of the bowel after, with a lap sponge, dry it, and it usually takes 2 people to hold the bowel because the key here is there's a risk of the bowel twisting in longitudinal orientation if you don't maintain alignment. So that pen line on the anti-mesenteric surface. This helps you maintain alignment, so you don't start to spiral the bowel with your staple lines. Once the bowel is marked, I measure the intestine. He usually uses a 30 silk that's been dipped in mineral oil to make it nice and soft, and he measures so he knows what the starting bowel length is. And I also measure the caliber, and I usually don't enter this operation unless they're 5 centimeters dilated just for, to make it worthwhile. I also record the length of the dilated segment that's going to be stepped, so I have those numbers pre. Dr. Rails usually uses an endo GII stapler rather than an open GII stapler for the step procedure. I just find the size of the head of the cartridge to be more amenable in a smaller person. With a hemostat, make a mesenteric window and apply. The stapler across the bowel and I go perpendicular to the mesentery at 90 and 270 degrees. If zero is the mesenteric vessels coming in on the mesenteric side, I come across the bowel perpendicular to the mesentery at 3 o'clock and 9 o'clock. Again, there's an illustration below the media player to help you with visualization. Doctor Well uses a vascular cartridge or a white load with the end of GIA stapler, which is a 2.5 millimeter that crimps down to a 1 millimeter. And originally when I first started doing this back in 2003, early on, I had a couple of leaks that were related to the classic blue load. And ever since then, I switched to the vascular load and I haven't had a problem. I think it's more appropriate for a younger person's bowel thickness. He makes sure to use a surgical ruler to measure everything. If I was doing this in a baby, I would make the caliber about 1.5 centimeters and For an older infant or child, usually about 2 to 2.5 centimeter caliber. The last thing you want to do is make it too narrow and then you end up obstructing the patient. And especially in the setting of someone who has borderline motility, then you just make the problem worse. So, I cut that white ruler with pre-cut it with a pair of scissors to the right length. And I put it on the end of a straight hemostat. Then I use the staple cartridge. I come across the bowel with the purple line straight up to the sky so that you're not twisting the bowel, and I apply the stapler, and then I measure it with the ruler to the end of the bowel. And as you get going, you measure it to the end and to the side. So before firing, he makes sure to measure what he's cutting both the sides of the stapler and to the side of the bowl. One of the proposed advantages of the step is that the surgeon can maintain. The caliber all the way down from top to bottom by these measurements. When I'm happy with the measurement, I fire the stapler and then I place a suture in the crotch of that stapler. If you were to open that staple line, you could potentially have a leak in the crotch. So, I do a U stitch, usually with a 40PDS to close off that little crotch to prevent a leak there. And then he comes from the alternate side of the bowel. So, working with a partner, one person works from one side of the bowel and the other person works from the other side, and together you work your way down. The most versatile cartridge is the 45 millimeter cartridge, but you might need a few 30s and you might need a few 60s depending on whether you're at the beginning or the most dilated part of the bowel as you go along. One nuance that I started to do subsequently that wasn't originally described is right at the top of the step, And right at the bottom of the step where you transition in and out of the step, you could end up with a dog ear there, a blind loop that over time can dilate up. So what I do at the top and the bottom of the step is I will fire another cartridge, uh, that tapers that bowel coming into the step segment. That way you avoid having this kind of blind-ended thing that can grow over. Time. In other words, if you look at the image we've included, you'll see a corner right at the first staple line. Dr. Wales is saying that this part can dilate and form a blind loop, so he comes across that corner obliquely so you don't have that sharp angle. It is more tangential from proximal to distal to taper into the step, and Dr. Helmroth pointed out that if you have one part become dilated, then the step segments are able to rotate. Away from each other separately, and when they twist, this can form a functional obstruction. So that's a reason to avoid a dog ear, to avoid one part getting dilated and then the bowel twisting and obstructing. So once he's done stepping, he records the length of the bowel that was stepped, the new total length of the bowel there, and the caliber of the bowel, which is now 2 to 2.5 centimeters. Michael has a lot of experience with this, but Orientation like the operation was originally described going back and forth perpendicular to the mesentery, and that's how I've always done it. And some people do like to do it the opposite orientation. So coming in anti-mesenteric, which would be 180 degrees from the mesentery on the anti-mesenteric side and the mesenteric side, so up and down. But Dr. Whales doesn't do it that way. And I want to talk about how proximal, where do you start the step procedure first? I don't step the duodenum. I start where the bowel starts to dilate. That's usually in the duodenum. And I guess if the whole thing fell apart and the person leaked, I do like to be able to get proximal to the staple line if I ever had to go back in an emergency. So, I don't like to have the staple line going right up into the duodenum. So he tapers a bit coming into the step segment, but not usually the duodenum. If I was going to narrow the duodenum, I would use a stapler to partially narrow it on the lateral side away from the bile duct and the ampula, and I don't usually placate the duodenum because I find Those sutures usually fail. So remember, the duodenum doesn't have a mesentery. And so when we see these kids that have had step procedures, they have no way of orienting 3 and 9 o'clock because there is no mesentery to bring it up. And so they're basically diving into the bowel in different areas. OK, we've covered a lot so far here. To summarize, Doctor Helmrath reviewed some of the history behind the lengthening procedures. We reviewed some of the considerations before proceeding with the lengthening procedure, including the size discrepancy between bowel segments and what the underlying diagnosis for the patient is. Then we reviewed in detail how Doctor Wells' step procedure. Important points include remembering to measure the ball before and after, measure the segments as you're proceeding, consider putting a stitch in the crotch of the staple lines, and try not to end up with a dog ear at the start or end of the whole stepped segment. Next time, we'll review discussions with the family, additional pre-op considerations, and post-op outcomes with complications. So be sure to stay tuned for part 2 of this episode on the lengthening procedures for intestinal failure patients. Thanks so much for listening. If you liked what you heard, don't forget to subscribe to our YouTube channel. Leave us a like or a comment on Apple Podcasts, Spotify. wherever you're listening. And as always, don't forget to download the Stay Current in pediatric surgery app. It's on the Apple App Store or in the Google Play Store. Until next time, I'm Ellen. And I am. And remember, knowledge should be free.

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