Chapter 144: The Umbilicus

Umbilical cord anatomy · Delayed cord clamping · Single umbilical artery · Omphalitis · Umbilical granuloma · Umbilical hernia · Omphalocele · Urachal remnant · Omphalomesenteric duct

🩺 Key fact: Delayed cord clamping (30-60 sec) recommended for term and preterm infants to improve iron stores and hemodynamic stability.

🩺 The Umbilicus: Core Concepts

🔬 Normal anatomy
2 umbilical arteries, 1 umbilical vein, Wharton jelly. Delayed cord clamping 30-60 sec improves iron stores and reduces transfusions.

⚠️ Single umbilical artery (SUA)
Incidence 5-10/1000 births. Higher frequency in twins. 20-30% have associated congenital anomalies (renal, cardiac, GI).

🦠 Omphalitis
Umbilical stump infection (S. aureus, E. coli, GBS). Erythema extending to abdominal wall → systemic infection, necrotizing fasciitis. Treat with IV antibiotics.

🩸 Umbilical granuloma
Moist, pink/red granulation tissue at base. Treat with silver nitrate cauterization or alcohol.

🫀 Umbilical hernia
Soft swelling, reducible, common in Black infants and low birthweight. Most close spontaneously by 1-5 years. Surgery if persists >4-5 years or strangulation.

🧬 Congenital anomalies
Omphalocele (sac-covered, central, associated anomalies), gastroschisis (no sac, right side). Omphalomesenteric duct remnant (Meckel diverticulum, umbilical polyp). Urachal remnant (clear urine drainage).

⚡ Warning signs of omphalitis: Erythema extending beyond umbilical base, purulent discharge, abdominal wall cellulitis, poor feeding, lethargy, fever → IV antibiotics + surgical consult.

🔍 Approach to umbilical disorders in the newborn

Umbilical stump: normal separation within 2 weeks – Delayed separation >1 month may indicate neutrophil chemotactic defect (e.g., leukocyte adhesion deficiency) or infection.

Omphalitis: erythema, purulence, abdominal wall cellulitis – Obtain blood culture, start IV antibiotics (ampicillin + gentamicin + clindamycin/vancomycin). Surgical consult for necrotizing fasciitis.

Umbilical granuloma: moist red tissue, serous discharge – Treat with silver nitrate cauterization (protect surrounding skin) or alcohol wipes x 3-5 days.

Umbilical hernia: reducible, defect in fascia – Reassure parents; surgery if persists >4-5 years, enlarges, or strangulation (rare).

Urachal remnant: clear/urine-like drainage – Ultrasound to rule out cyst, sinogram. Surgical excision.

Omphalomesenteric duct remnant: mucus or fecal drainage, umbilical polyp – Meckel scan, surgical excision.

📋 Stepwise management of umbilical conditions

Omphalitis management – IV antibiotics (ampicillin + gentamicin + clindamycin). Surgical debridement for necrotizing fasciitis. If abscess, incision and drainage.

Umbilical granuloma – Silver nitrate cauterization (apply to granuloma only, avoid skin). May repeat in 2-3 days. Alternative: alcohol wipes.

Umbilical hernia (reducible, asymptomatic) – Reassurance, no strapping or binding. Surgery indicated if: not closed by age 4-5 years, symptomatic, large defect (>2 cm), strangulated.

Omphalocele (sac-covered, central defect) – Cover with sterile plastic bag, NG tube, IV fluids. Surgical repair (primary or staged). Evaluate for associated anomalies (cardiac, Beckwith-Wiedemann).

Urachal remnant (patent urachus, cyst, sinus) – Surgical excision after infection controlled. May present with umbilical drainage (clear, yellow, urine).

📌 Delayed cord clamping contraindications: Placental abruption, cord avulsion, maternal instability, severe IUGR with abnormal Dopplers (some centers).

🧠 Rapid reflex prompts – Umbilicus

📌 Components of umbilical cord?
2 umbilical arteries, 1 umbilical vein, Wharton jelly.

📌 Single umbilical artery: associated anomalies?
20-30% have renal, cardiac, GI anomalies; need thorough exam/renal US.

📌 Omphalitis: pathogens?
S. aureus, E. coli, GBS, anaerobes.

📌 Treatment of umbilical granuloma?
Silver nitrate cauterization or alcohol.

📌 When to operate on umbilical hernia?
Persists >4-5 years, large defect (>2 cm), symptomatic or strangulated.

📌 Clear urine-like drainage from umbilicus?
Patent urachus (urachal remnant).