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Difficulty: Very hardPediatric Gastrointestinal Disorders

A 4-week-old boy is brought to the pediatric emergency department with a 12-hour history of high fever, progressive lethargy, and explosive, foul-smelling, bloody diarrhea. His parents report that his abdomen has become massively swollen over the past day. His neonatal history is notable for passage of meconium at 50 hours of life and chronic constipation requiring glycerin suppositories. Vital signs show a temperature of 39.1°C (102.4°F), heart rate of 185/min, respiratory rate of 60/min, and blood pressure of 65/35 mm Hg. Physical examination reveals a lethargic, mottled infant with a markedly distended and tympanic abdomen. Digital rectal examination results in a forceful expulsion of foul-smelling stool and gas. Arrange the following management steps in the most appropriate chronological sequence for this patient.

  1. 1Administer intravenous crystalloid fluid boluses and empiric broad-spectrum antibiotics
  2. 2Obtain abdominal radiographs to evaluate for pneumoperitoneum
  3. 3Place a rectal tube and initiate serial normal saline irrigations
  4. 4Obtain a bedside rectal suction biopsy for histologic confirmation
  5. 5Perform definitive surgical resection of the aganglionic bowel segment

Answer

The correct sequence is: Resuscitation (IV fluids/antibiotics) → Abdominal radiographs → Rectal irrigations → Rectal suction biopsy → Surgical resection.
This patient's presentation of fever, explosive diarrhea, massive abdominal distension, and shock in the setting of delayed meconium passage is classic for Hirschsprung-associated enterocolitis (HAEC). HAEC is a potentially fatal complication requiring rapid, stepwise intervention. The sequence must begin with the ABCs of resuscitation: intravenous fluid boluses and empiric broad-spectrum antibiotics to treat septic shock. Once resuscitation is underway, the next critical step is to obtain abdominal radiographs to evaluate for toxic megacolon or pneumoperitoneum. This is crucial because the presence of free air contraindicates bedside mechanical decompression and necessitates emergent surgery. If perforation is ruled out, the mainstay of acute HAEC therapy is decompression via a large-bore rectal tube and serial normal saline irrigations to relieve the functional obstruction. Once the acute enterocolitis has resolved and the patient is stable, a rectal suction biopsy is performed to confirm the underlying diagnosis of Hirschsprung disease. Finally, definitive surgical management (resection of the aganglionic bowel) is planned.

Step-by-Step Solution

1
Identify the clinical syndrome and determine the immediate priority.
The patient has Hirschsprung-associated enterocolitis (HAEC) presenting with septic shock, requiring immediate intravenous fluids and broad-spectrum antibiotics.
Airway, breathing, and circulation (ABC) stabilization takes precedence in any critically ill patient.
2
Select the appropriate diagnostic imaging before performing any procedures.
Obtain abdominal radiographs.
It is critical to rule out pneumoperitoneum (intestinal perforation) before initiating rectal instrumentation.
3
Perform targeted mechanical decompression of the colon.
Place a rectal tube and begin serial normal saline irrigations.
This relieves the functional obstruction, flushing out retained feces and reducing bacterial overgrowth and bowel wall tension.
4
Confirm the underlying diagnosis.
Perform a rectal suction biopsy.
Once the patient is stabilized from the acute episode, histologic evidence of aganglionosis is required before surgery.
5
Provide definitive treatment.
Perform surgical resection of the aganglionic segment.
A pull-through procedure is the definitive cure, typically performed after the enterocolitis has been successfully managed.

Key Concept

The management sequence for Hirschsprung-associated enterocolitis (HAEC) prioritizes hemodynamic stabilization, followed by radiographic exclusion of perforation, mechanical decompression with rectal irrigations, diagnostic confirmation with biopsy, and finally definitive surgery.
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Topics

Pediatric Gastrointestinal Disorders

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