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Difficulty: Very hardNeonatal Disorders

A 19-day-old male infant is brought to the pediatric emergency department due to a sudden onset of dark green vomiting over the past 6 hours. He was born at 39 weeks of gestation with a birth weight of 3.4 kg (7 lb 8 oz). Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. The infant had an uncomplicated neonatal course and has been exclusively breastfed. Upon arrival, he appears lethargic and pale. Vital signs are temperature 36.0°C (96.8°F), heart rate 190/min, respiratory rate 62/min, and blood pressure 58/34 mm Hg. Capillary refill time is 5 seconds. Physical examination reveals scattered 1- to 2-mm yellow pustules on an erythematous base over the trunk. Abdominal examination reveals severe distension, marked tenderness with involuntary guarding, and absent bowel sounds. Digital rectal examination demonstrates a small amount of frankly bloody stool. A plain radiograph of the abdomen shows a distended stomach and proximal duodenum with an absolute paucity of gas in the distal bowel. Intravenous access is established, and a bolus of isotonic normal saline is being administered. Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Upper gastrointestinal contrast series under fluoroscopy
  3. C
    Abdominal computed tomography scan with intravenous contrast
  4. D
    Intravenous acyclovir and broad-spectrum antibiotics
  5. E
    Arterial blood gas analysis to calculate metabolic acid-base compensation

Answer

Immediate exploratory laparotomy
The correct answer is immediate exploratory laparotomy. This neonate presents with bilious emesis, a distended and rigid abdomen, frankly bloody stools, and profound hemodynamic instability (tachycardia, hypotension, and prolonged capillary refill). These findings are highly characteristic of intestinal malrotation complicated by midgut volvulus with resultant bowel ischemia and necrosis. While an upper gastrointestinal contrast series is the gold-standard diagnostic modality for malrotation, it is only appropriate for hemodynamically stable patients. When a patient demonstrates clear clinical evidence of bowel strangulation (e.g., peritonitis, hematochezia, shock), diagnostic imaging is contraindicated. The next best step is emergent fluid resuscitation followed directly by immediate exploratory laparotomy (typically a Ladd procedure) to untwist the bowel, evaluate for viability, and restore perfusion. Any diagnostic delay increases the risk of irreversible intestinal necrosis, short bowel syndrome, or death.

Step-by-Step Solution

1
Analyze the presenting symptom of dark green (bilious) vomiting in a neonate.
Identified as a hallmark sign of a neonatal surgical emergency, most commonly intestinal malrotation with midgut volvulus.
Bilious emesis signifies an obstruction distal to the ampulla of Vater, requiring urgent surgical evaluation.
2
Evaluate the patient's hemodynamic status and physical examination findings.
The patient exhibits shock (tachycardia, hypotension, prolonged capillary refill) and peritonitis (rigid abdomen, involuntary guarding, bloody stool).
These findings indicate that the volvulus has caused strangulation and frank bowel ischemia, advancing the condition from an impending emergency to an immediate life-threatening catastrophe.
3
Differentiate between the diagnostic pathways for stable versus unstable patients with suspected malrotation.
Determined that while an upper GI series is the gold standard for stable patients, it must be bypassed in favor of immediate surgery for this unstable patient.
Any delay in restoring perfusion to the strangulated bowel increases the risk of irreversible short bowel syndrome or death.

Key Concept

In a neonate presenting with bilious emesis and clinical signs of bowel ischemia or hemodynamic instability, immediate exploratory laparotomy is required, bypassing standard diagnostic imaging.
Estimated Time:1m 30s
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Topics

Neonatal Disorders

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