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Omphalocele

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Omphalocele

Key Points

  • Omphalocele is a midline abdominal wall defect at the umbilical ring; herniated contents are enclosed in a sac of peritoneum, Wharton’s jelly, and amnion.
  • Incidence is approximately 1 in 4,000 live births; fetal demise rate is nearly 3 in 4 when detected by second-trimester ultrasound.
  • Strongly associated with other congenital anomalies (cardiac defects, trisomies, Beckwith-Wiedemann syndrome).
  • Surgical closure may be primary or staged depending on defect size.

Pathophysiology

Omphalocele results from a folding defect during embryonic development as the bowel returns to the abdominal cavity from the physiologic midgut herniation that normally occurs around weeks 6 to 10 of gestation. The defect occurs at the abdominal midline involving the umbilical ring. Unlike gastroschisis, the herniated contents are encased by a three-layer protective sac consisting of peritoneum (inner), Wharton’s jelly (middle), and amnion (outer). The sac may contain bowel, liver, and other abdominal organs. Omphalocele is frequently associated with chromosomal anomalies and other congenital defects.

Clinical Manifestations

  • Central abdominal mass at the umbilicus covered by a translucent membrane (peritoneal sac).
  • Sac may contain small bowel, large bowel, liver, or other organs.
  • Umbilical cord inserts directly into the sac.
  • If sac ruptures, presentation resembles gastroschisis with exposed bowel.

Nursing Assessment

  • Assess integrity of the peritoneal sac (intact versus ruptured — ruptured sac requires emergent management similar to gastroschisis).
  • Evaluate defect size and contents visible through the sac.
  • Assess for associated anomalies: cardiac defects (most common), chromosomal anomalies (trisomy 13, 18, 21), Beckwith-Wiedemann syndrome.
  • Monitor respiratory status (large omphaloceles may compress the diaphragm).
  • Monitor temperature, fluid balance, and hemodynamic stability.

Nursing Interventions

  • Protect the intact sac: cover with warm, moist sterile saline dressings and a sterile transparent barrier.
  • If sac is ruptured, manage as a surgical emergency with the same protocol as gastroschisis.
  • Maintain thermoregulation and IV fluid support.
  • Maintain NPO status; provide parenteral nutrition.
  • Small defects: prepare for primary surgical closure in the neonatal period.
  • Large defects: staged closure using a prosthetic silo to gradually reduce contents into the abdominal cavity.
  • Preoperative MRI may help determine defect size and surgical planning.
  • Educate families about the treatment plan, potential for associated anomalies, and anticipated NICU course.
  • Coordinate genetic counseling if chromosomal abnormalities are suspected.

Self-Check

  1. What three layers compose the protective sac in omphalocele?
  2. Why is omphalocele more strongly associated with chromosomal anomalies than gastroschisis?
  3. What is the nursing priority if the omphalocele sac ruptures?

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