15.1 Enteral Nutrition: Indications & Access

Indications for Enteral Nutrition

Enteral nutrition (EN) is the delivery of nutrients into the gastrointestinal (GI) tract via a tube, stoma, or the mouth when oral intake alone cannot sustain growth and health. The overriding principle, cited across ASPEN, ESPGHAN, and AND guidance, is "if the gut works, use it": any child with a functional GI tract who cannot meet nutrient needs by mouth is a candidate for EN rather than parenteral nutrition.

Common pediatric indications include:

• Inability to meet needs orally — generally operationalized as persistent intake below roughly 50–60% of estimated requirements, or dependence on excessive feeding time that impairs quality of life (common in neurologic impairment, cerebral palsy, and complex congenital heart disease).
• Dysphagia with aspiration risk — oropharyngeal incoordination in prematurity, craniofacial anomalies, or neurodegenerative disease; videofluoroscopic swallow study (VFSS) demonstrating aspiration is the usual trigger.
• Failure to thrive (FTT) — chronic malnutrition unresponsive to oral nutrition intervention, including cystic fibrosis with weight loss, chronic kidney disease, cholestatic liver disease, and cancer cachexia.
• Chronic disease with increased requirements — congenital heart disease awaiting surgery, bronchopulmonary dysplasia, and inflammatory bowel disease (note: exclusive enteral nutrition is first-line induction therapy for pediatric Crohn's disease in ESPGHAN/ESPGHAN-endorsed guidance).
• Critical illness — early EN (within 24–48 hours) is associated with improved outcomes in pediatric intensive care when the child is hemodynamically stable.

Contraindications

Absolute contraindications are few: mechanical bowel obstruction, ileus, hemodynamic instability requiring escalating vasopressor support with concern for gut ischemia, and active necrotizing enterocolitis. Relative contraindications include severe refractory malabsorption (e.g., ultra-short bowel early in adaptation), intractable vomiting or diarrhea despite management, and high-output enterocutaneous fistula. When the gut is unusable, the alternative is parenteral nutrition — an exam-favorite comparison point.

Access Device Selection

Device choice is driven by two questions: How long is therapy expected to last? and Does the child need gastric or post-pyloric feeding?

The Duration-of-Therapy Decision Rule

Nasal tubes are quick and avoid anesthesia, but carry cumulative risks with long-term use: sinusitis, nasal septum pressure injury, esophageal erosion, frequent dislodgement, and social stigma in school-age children. A classic exam trap is the vignette in which a child has been cycling through NG tubes for months — the correct answer is to discuss gastrostomy, not to replace the NG tube again.

Gastric Access Options

• NG tube — placed at the bedside; ideal for short-term feeding, trial feeding, or pre-operative nutrition support. Placement verification is a safety-critical exam topic: radiography is the gold standard for confirming initial placement of a blindly inserted tube. Aspirate pH ≤ 5.5 supports gastric position but is unreliable in children on acid suppression; auscultation alone is never acceptable.
• Gastrostomy (G-tube) — for long-term therapy. Three placement routes:
  • PEG (percutaneous endoscopic gastrostomy) — most common; performed under endoscopic guidance with sedation, less invasive than surgery, shorter procedure time, and generally lower cost.
  • Surgical gastrostomy (open or laparoscopic) — preferred when a concurrent Nissen fundoplication is planned for severe gastroesophageal reflux disease (GERD), or when anatomy precludes endoscopy (e.g., prior gastric surgery).
  • Radiologically inserted gastrostomy (RIG) — performed by interventional radiology under fluoroscopy; an option when endoscopy is contraindicated or unavailable, though push-type PEG and RIG differ in tube caliber and peritonitis risk profile.
• Low-profile ("button") devices are typically placed once the tract matures (about 6–8 weeks for a PEG tract, longer — around 3 months — after surgical or radiologic placement) and are favored for active or school-age children.

Gastric vs Post-Pyloric Feeding

Gastric feeding is physiologically preferred: it preserves the antimicrobial barrier of gastric acid, permits bolus feeding that mimics meals, allows osmotic mixing in the stomach, and supports normal hormonal responses. Post-pyloric (transpyloric) feeding is reserved for specific problems:

• Gastroparesis or severely delayed gastric emptying
• Recurrent vomiting or aspiration of gastric contents despite medical management
• Severe GERD with aspiration where fundoplication is deferred
• Anatomic issues (e.g., gastric compression, tracheoesophageal concerns)

For short-term post-pyloric access, an NJ tube is used. For long-term needs, options are a gastrojejunostomy (GJ) tube through an existing gastrostomy tract — practical because the gastric port allows venting and medication delivery — or a surgical jejunostomy (J-tube) when gastric access is impossible or unsafe. A key exam point: the jejunum has no reservoir capacity, so jejunal feeds must be delivered continuously, never by bolus, or dumping and cramping result. A second trap: GJ jejunal ports are small-bore and clog easily with medications; crushing extended-release tablets into a jejunal tube is both an occlusion risk and a pharmacologic error.

Putting It Together: A Worked Scenario

A 3-year-old with cerebral palsy, weight-for-length below the 1st percentile, safe swallow on VFSS but taking 90 minutes per meal, has been on NG feeds for 3 months with two unplanned ED visits for dislodged tubes. Expected need is years. Correct selection: gastrostomy with gastric bolus feeding — duration clearly exceeds 4–6 weeks, swallow is safe, gastric feeding is physiologic, and a low-profile button will improve quality of life. If the same child had documented aspiration of gastric contents and vomiting despite a proton pump inhibitor, the answer shifts to post-pyloric access (GJ or jejunostomy with continuous feeds, or gastrostomy with fundoplication depending on the GERD severity).