{
 "topic": "Short Bowel Syndrome",
 "slug": "short-bowel-syndrome",
 "category_id": 15019,
 "summary": "Pediatric short bowel syndrome: NEC/atresia/gastroschisis/volvulus as the leading causes, bowel-length and ileocecal-valve prognostic factors, and the TPN-to-enteral-adaptation treatment pathway that has pushed survival above 90%.",
 "written_by": "claude-sonnet",
 "references": [
  {
   "title": "Textbook of Pediatric Gastroenterology, Hepatology and Nutrition (Stefano Guandalini, Anil Dhawan)",
   "author": null,
   "pages": [
    581,
    625
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  },
  {
   "title": "CURRENT Diagnosis and Treatment Pediatrics, Twenty-Fourth Edition",
   "author": "Hay, William W., Levin, Myron J., Deterding, Robin R., Abzug, Mark J.",
   "pages": [
    672
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  },
  {
   "title": "Pediatric Nutrition (Ronald E. Kleinman, Frank R. Greer)",
   "author": null,
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    823,
    1264,
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   ]
  },
  {
   "title": "Kliegman R. Nelson Textbook of Pediatrics 2-Volume Set 22ed 2024",
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  },
  {
   "title": "Signs and Symptoms in Pediatrics",
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    216
   ]
  },
  {
   "title": "Cover",
   "author": "Vitalsource Download",
   "pages": [
    995
   ]
  },
  {
   "title": "Pediatric Nutrition Handbook",
   "author": "Kleinman, Ronald E.",
   "pages": [
    697
   ]
  },
  {
   "title": "Zitelli and Davis' Atlas of Pediatric Physical Diagnosis: Expert Consult - Online",
   "author": null,
   "pages": [
    687
   ]
  }
 ],
 "short": [
  {
   "title": "In short",
   "content": "- Short bowel syndrome (SBS) is the leading cause of intestinal failure in children, defined as reduced functional intestinal mass/absorptive surface insufficient for the fluid, electrolyte, and nutrient needs of normal growth; it accounts for about 44% of intestinal failure cases in infants.\n- Most pediatric SBS follows neonatal surgical resection; the most common causes are necrotizing enterocolitis (about 45%), intestinal atresia (about 23%), gastroschisis (about 15%), and midgut volvulus (about 15%), with rarer causes including congenital short bowel, long-segment Hirschsprung disease (total intestinal aganglionosis), and ischemic bowel injury.\n- Incidence rises with lower birthweight and earlier gestational age, estimated at about 7 per 1,000 US infants with birthweight under 1,500 g.\n- Normal small bowel length at birth is 200-250 cm, growing to 300-800 cm by adulthood; infants tolerate bowel resection better than adults because of the potential for intestinal growth and adaptation - an infant with as little as 15 cm of bowel (with an intact ileocecal valve) may still achieve enteral autonomy.\n- Functional/practical definitions: massive small bowel resection greater than 75%, or dependence on parenteral nutrition for more than 6 weeks (one source: more than 2-3 months) qualifies as intestinal failure; symptomatic short gut generally occurs with less than 150 cm of small bowel without a colon, or less than 70 cm with an intact colon.\n- Prognosis depends on residual bowel length, presence of the ileocecal valve, preservation of the colon, type and timing of enteral feeding, adaptive potential of residual bowel, frequency of infections, and health of other organs (stomach, pancreas, liver, colon); preserving the ileum/ileocecal valve confers the best prognosis.\n- Contributing factors to persistent symptoms include decreased absorptive surface, altered motility, intraluminal bacterial overgrowth (with bile salt deconjugation and fatty acid hydroxylation), bile salt malabsorption from terminal ileal resection, and disaccharidase deficiency; infants with NEC or gastroschisis tend to have a more prolonged course than other causes.\n- Total parenteral nutrition (TPN) is used in the immediate postoperative period; early initiation of enteral feeding maximizes enteric hormonal stimulation and bowel adaptation (elongation, hypertrophy, and reduced peristaltic rate).\n- With modern multidisciplinary SBS programs and improved management of catheter-related complications and parenteral-nutrition-associated liver disease (PNALD), survival now exceeds 90%.\n"
  }
 ],
 "long": [
  {
   "title": "Definition",
   "content": "Short bowel syndrome (SBS) is a state of reduced functional intestinal mass (absorptive surface) below the amount required for digestion and absorption of the nutrients and fluids needed for normal growth and survival, resulting in intestinal malabsorption. It results from congenital malformations or resection of the small bowel. Intestinal failure is a related, broader concept: a critical reduction of gut mass or function below the minimum needed to absorb adequate nutrients and fluids for growth, which may be reversible or irreversible depending on the cause of SBS, the length of remaining intestine, preservation of the colon and ileocecal valve, and the treatment used to restore intestinal capacity. Practical/functional definitions of intestinal failure include a small bowel resection greater than 75%, or dependence on parenteral nutrition for more than 6 weeks (cited elsewhere as more than 2-3 months).\n"
  },
  {
   "title": "Epidemiology",
   "content": "SBS is the leading cause of intestinal failure in both adults and children, and specifically accounts for about 44% of intestinal failure cases in infants. Incidence increases with lower birthweight and earlier gestational age, estimated at about 7 per 1,000 US infants born weighing less than 1,500 g. The exact incidence and prevalence of pediatric SBS in the United States are not precisely known, but advances in neonatal intensive care and surgical technique have likely increased the frequency with which pediatricians encounter these patients.\n"
  },
  {
   "title": "Etiology",
   "content": "The vast majority of pediatric SBS follows neonatal surgical resection of intestine. The most common causes in children are necrotizing enterocolitis (about 45% of cases), intestinal atresia (about 23%), gastroschisis (about 15%), and midgut volvulus (about 15%); less common causes include congenital short bowel, long-segment Hirschsprung disease (total intestinal aganglionosis), ischemic bowel injury, tumor, and radiation enteritis. Later in life, volvulus, trauma, and Crohn disease become the most common causes of short bowel syndrome.\n"
  },
  {
   "title": "Pathophysiology",
   "content": "At birth, small bowel length is normally 200-250 cm, growing to 300-800 cm by adulthood. Loss of more than 50% of the small bowel, with or without loss of a portion of the large intestine, can produce generalized malabsorption or specific nutrient deficiencies, depending on which segment is resected. Symptomatic short gut generally manifests with less than 150 cm of residual small bowel in the absence of a colon, or less than 70 cm of small bowel with an intact colon, in older children and adults. Bowel resection is better tolerated in infants than adults because of the potential for intestinal adaptation: early enteral feeding stimulates enteric hormones and drives adaptation of the residual bowel through elongation, hypertrophy, and reduced peristaltic rate, allowing an infant with as little as 15 cm of bowel (particularly with an intact ileocecal valve) to potentially achieve enteral autonomy. Persistent symptoms in affected neonates relate to decreased absorptive surface, altered intestinal motility, intraluminal bacterial overgrowth (which causes secondary bile salt deconjugation and fatty acid hydroxylation), bile salt malabsorption from terminal ileal resection, and disaccharidase deficiency.\n"
  },
  {
   "title": "Clinical Features",
   "content": "SBS presents with chronic malabsorptive diarrhea, malnutrition, and failure to thrive, most commonly beginning in the newborn period in association with necrotizing enterocolitis or a congenital anomaly (gastroschisis, intestinal atresia, or malrotation with secondary midgut volvulus). Symptoms of colitis can occur during the initiation of enteral feedings in affected infants. Infants with NEC or gastroschisis as the underlying cause tend to have a more prolonged clinical course than those with other causes of short bowel. Recovery can be prolonged, sometimes requiring TPN for the first several years of life.\n"
  },
  {
   "title": "Diagnostics",
   "content": "Diagnosis is based on the history of extensive intestinal resection or a known congenital anomaly, together with the clinical picture of malabsorption, and confirmed by knowledge of the residual bowel length and anatomy (presence/absence of the ileocecal valve and colon) from the surgical record.\n"
  },
  {
   "title": "Treatment",
   "content": "In the immediate postoperative period following loss of a significant length of small bowel, total parenteral nutrition is used to support growth, hydration, and electrolyte balance. Early initiation of enteral feeding is emphasized because it maximizes enteric hormonal stimulation and drives adaptation of the residual bowel (elongation, hypertrophy, and slowed peristalsis), which is central to eventually weaning from parenteral nutrition.\n"
  },
  {
   "title": "Prognosis",
   "content": "Prognosis depends on several factors: the length of residual bowel, presence or absence of the ileocecal valve, the type of enteral feeds used, how early enteral feeding is introduced, the adaptive potential of the residual bowel, the frequency of infections, and the health of other organs (stomach, pancreas, liver, colon). The best prognosis is seen in children in whom the ileum and ileocecal valve (and, in some accounts, the duodenum and distal ileum) can be preserved. With modern advances in managing catheter-related complications and parenteral-nutrition-associated liver disease, together with multidisciplinary programs specializing in short bowel syndrome care, survival has improved to greater than 90%.\n"
  },
  {
   "title": "Complications",
   "content": "Long-term parenteral nutrition dependence carries risk of catheter-related bloodstream infection and parenteral-nutrition-associated liver disease (PNALD), historically major drivers of morbidity and mortality in SBS, though outcomes related to these complications have improved substantially with specialized multidisciplinary care. Delayed recognition, diagnosis, and treatment of the underlying surgical condition (for example, necrotizing enterocolitis presenting with abdominal wall edema, cellulitis, distention, and crepitus) can lead to severe short bowel syndrome or death, underscoring the importance of early recognition of the precipitating illness itself.\n"
  }
 ],
 "clinical": [
  {
   "title": "Managing the Infant After Massive Intestinal Resection",
   "content": "Anticipate short bowel syndrome in any infant who undergoes extensive resection for necrotizing enterocolitis, intestinal atresia, gastroschisis, or midgut volvulus - the four leading pediatric causes - and document the resulting bowel length and whether the ileocecal valve and colon were preserved, since these details drive prognosis. Start total parenteral nutrition in the immediate postoperative period to support growth, hydration, and electrolytes, but prioritize early initiation of enteral feeding as soon as it is safely tolerated, since enteral stimulation is what drives the adaptive elongation, hypertrophy, and motility changes that allow eventual weaning off parenteral nutrition. Expect a more prolonged course in infants whose SBS resulted from NEC or gastroschisis compared with other causes, and expect possible colitis-like symptoms when enteral feeds are first introduced. Screen for intraluminal bacterial overgrowth, bile salt malabsorption (especially after terminal ileal resection), and disaccharidase deficiency as contributors to ongoing symptoms rather than assuming persistent diarrhea simply reflects inadequate bowel length alone.\n"
  },
  {
   "title": "Long-Term Follow-Up and Prognostic Counseling",
   "content": "Counsel families using the known prognostic factors: residual bowel length, presence of the ileocecal valve, type and timing of enteral feeds, the bowel's adaptive potential, infection frequency, and the health of other organs (stomach, pancreas, liver, colon) - preservation of the ileum and ileocecal valve in particular predicts a better outcome. Monitor closely for catheter-related bloodstream infection and parenteral-nutrition-associated liver disease during long-term PN dependence, since these have historically been major drivers of poor outcomes; referral to (or management within) a multidisciplinary short bowel syndrome program is appropriate given that such specialized care has helped push survival above 90%. Reassure families that infants tolerate extensive resection better than adults because of ongoing intestinal growth and adaptive capacity - even a residual bowel length as short as 15 cm, particularly with an intact ileocecal valve, may still support eventual enteral autonomy.\n"
  }
 ]
}