Paramedics arrive at the emergency department with a 4-week-old infant who is lethargic an… — USMLE Step 2 CK

Paramedics arrive at the emergency department with a 4-week-old infant who is lethargic and feverish. The infant's parents report a 12-hour history of explosive, foul-smelling diarrhea and progressive abdominal swelling. Medical history is notable for delayed meconium passage after birth, which required a glycerin suppository. Vital signs show a temperature of $39.2^\circ\text{C}$ ( $102.6^\circ\text{F}$ ), a heart rate of $185\text{/min}$ , a respiratory rate of $60\text{/min}$ , and a blood pressure of $58/30\text{ mm Hg}$ . The capillary refill time is 4 seconds. On physical examination, the infant is poorly responsive and has a markedly distended, tense abdomen. The clinical picture is highly suspicious for Hirschsprung-associated enterocolitis complicated by septic shock.

Arrange the following management steps in the most appropriate chronological sequence for this patient's immediate care.

1Establish intravenous access and administer an isotonic fluid bolus
2Obtain aerobic and anaerobic blood cultures
3Administer broad-spectrum intravenous antibiotics
4Obtain a portable abdominal radiograph
5Perform rectal irrigations and place a nasogastric tube

Answer

The correct sequence is: 1) Establish intravenous access and administer an isotonic fluid bolus, 2) Obtain aerobic and anaerobic blood cultures, 3) Administer broad-spectrum intravenous antibiotics, 4) Obtain a portable abdominal radiograph, and 5) Perform rectal irrigations and place a nasogastric tube.

In any critically ill pediatric patient, the absolute first priority is stabilization of the airway, breathing, and circulation (ABCs). This infant is in uncompensated septic shock (hypotension, prolonged capillary refill, lethargy), making rapid intravenous fluid resuscitation the most urgent step. Once vascular access is established, blood cultures should be drawn immediately prior to the administration of broad-spectrum antibiotics to maximize the chances of identifying the offending pathogen. After the initial medical resuscitation is underway, the focus shifts to evaluating and treating the specific pathology—Hirschsprung-associated enterocolitis. An abdominal radiograph must be obtained next to rule out intestinal perforation. If no free air is present, it is then safe to proceed with the definitive medical therapy, which consists of rectal irrigations and nasogastric decompression to relieve colonic distension and bacterial stasis.

Step-by-Step Solution

Recognize uncompensated septic shock and prioritize hemodynamic stabilization.

Establish intravenous access and administer an isotonic fluid bolus.

The patient's lethargy, severe tachycardia, hypotension, and delayed capillary refill require immediate fluid resuscitation to restore adequate tissue perfusion.

Prepare for antimicrobial therapy by securing diagnostic samples.

Obtain aerobic and anaerobic blood cultures.

Identifying the causative pathogen is crucial for targeted therapy; cultures must be drawn prior to administering antibiotics, provided this does not cause a significant delay in resuscitation.

Treat the suspected systemic infection.

Administer broad-spectrum intravenous antibiotics.

Early antibiotic administration is life-saving in septic shock and should occur as soon as possible after cultures are drawn.

Evaluate for life-threatening complications of enterocolitis.

Obtain a portable abdominal radiograph.

Before proceeding with mechanical interventions, imaging is necessary to rule out pneumoperitoneum (intestinal perforation), which would require immediate surgery rather than medical decompression.

Initiate disease-specific therapy for Hirschsprung-associated enterocolitis.

Perform rectal irrigations and place a nasogastric tube.

Once perforation is firmly ruled out, mechanical decompression of the bowel relieves the stasis and bacterial overgrowth that are driving the enterocolitis.

Key Concept

The management of Hirschsprung-associated enterocolitis with septic shock requires prioritization of the ABCs (fluids, cultures, antibiotics) followed by ruling out intestinal perforation via radiography before performing definitive mechanical decompression (rectal irrigations).

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