Kids Disease Child Disease Encyclopedia
Illustration representing Necrotizing Enterocolitis (NEC)
Emergency Neonatal Gastrointestinal & Systemic Infections

Necrotizing Enterocolitis (NEC)

Acute Ischemic & Inflammatory Neonatal Intestinal Necrosis

Primary risk age: Premature Neonates (Typically presents in the second or third week of life in the NICU)

Urgency
Emergency
Typical age
Premature Neonates (Typically presents in the second or third week of life in the NICU)
Body system
Neonatal (Newborns)

Typical course: NPO status and antibiotic therapy are maintained for 7 to 14 days; surgical recovery and re-feeding span several weeks or months.

Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13

1. Summary & Pathophysiology

Acute Ischemic & Inflammatory Neonatal Intestinal Necrosis

Pathophysiology (Development Path)

The immature gut barrier of a preterm infant is highly vulnerable to injury. Enteral feeding provides a substrate for bacterial proliferation. An ischemic or inflammatory trigger damages the mucosal lining, allowing bacteria to invade the intestinal wall. This leads to gas production within the wall (pneumatosis intestinalis), necrosis, and potential perforation.

Primary Causes & Etiology

Multifactorial; intestinal immaturity, mucosal ischemia, early enteral formula feeding, and abnormal bacterial colonization of the gut.

2. Symptom Continuum

  1. Early Onset Signs

    Feeding intolerance: delayed gastric emptying (large stomach residuals), mild abdominal distension, and decreased bowel sounds.

  2. Progressive Phase

    Significant abdominal distension, abdominal tenderness, erythema (redness) of the abdominal wall, and stools containing occult or gross blood.

  3. Severe Indicators

    Pneumoperitoneum (free air in the abdomen due to intestinal perforation), abdominal rigidity, septic shock (bradycardia, hypotension, apnea), disseminated intravascular coagulation (DIC), and death.

3. Clinical Verification

Plain abdominal X-ray (KUB) showing the diagnostic "pneumatosis intestinalis" (gas bubbles in the bowel wall) or portal venous gas. Free air under the diaphragm indicates perforation.

4. Care & Elements Plan

Primary Care Treatment Plan

Make the infant strictly NPO (nothing by mouth). Insert a nasogastric tube for gastric decompression. Initiate broad-spectrum intravenous antibiotics. Monitor abdominal X-rays frequently. Surgical intervention (peritoneal drain or laparotomy with bowel resection) is indicated for perforation or clinical deterioration.

Home Support Elements

Home care is strictly not applicable. This is a critical neonatal ICU emergency.

Generic Active Ingredients (No Brands)

  • Ampicillin, Gentamicin, and Metronidazole (intravenous antibiotic active ingredients used to cover enteric aerobic and anaerobic bacteria)
  • Intravenous total parenteral nutrition (TPN) components.

Lists active elements only. Never administer self-designed therapies.

5. Doctor Critical Lines

Critical Thresholds: When to See a Doctor

Any premature infant showing abdominal distension, vomiting, or blood in their stool requires immediate emergency neonatal evaluation and NPO status.

6. Vaccine & Prevention

Routine Prophylaxis (Prevention)

Prioritize breast milk feeding (exclusively human milk reduces NEC risk by 50-80% compared to formula). Implement cautious, standardized feeding protocols.

Immunization Context

No specific immunizations are associated with this inflammatory bowel disease.

7. Timelines & Outlook

Active Timeline

NPO status and antibiotic therapy are maintained for 7 to 14 days; surgical recovery and re-feeding span several weeks or months.

Expected Prognosis

Variable. NEC is a major cause of mortality in the NICU (15-30% mortality). Survivors of surgical resection are at risk for long-term gut complications.

Potential Untreated Complications

Intestinal perforation, peritonitis, sepsis, short bowel syndrome (due to extensive bowel resection), and intestinal strictures.

More in Neonatal Gastrointestinal & Systemic Infections

Emergency

Neonatal Sepsis

Acute Neonatal Systemic Bacterial Infection

Neonates (Early-onset: first 72 hours; Late-onset: 7 to 28 days)

Emergency

Neonatal Abstinence Syndrome (NAS)

Neonatal Perinatal Drug Withdrawal Syndrome

Neonates (onset typically within 24 to 72 hours of birth)

Severe

Infantile Hypertrophic Pyloric Stenosis

Gastric Outlet Obstruction

2 to 8 Weeks of Age