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Difficulty: HardPediatric Gastrointestinal Disorders

A primigravid mother rushes her 12-day-old male newborn to the acute care clinic because he has been persistently vomiting a bright green substance since the morning. The pregnancy and delivery were entirely normal. The mother mentions the infant is usually calm but has been inconsolably fussy and repeatedly drawing his legs up toward his chest. Upon triage assessment, the infant is lethargic with a heart rate of 188/min, respiratory rate of 58/min, and a palpable systolic blood pressure of only 55 mm Hg. Capillary refill time is prolonged at 4 seconds. The abdominal examination is notable for a tense, distended contour with involuntary guarding and absent auscultatory bowel activity. Intravenous access is rapidly secured, and a bolus of normal saline is administered. A bedside abdominal X-ray displays minimal gas in the distal intestine without free intraperitoneal air. Which of the following is the most appropriate next step in the management of this patient?

  1. Urgent operative interventionAnswer
  2. B
    Upper gastrointestinal contrast imaging
  3. C
    Nasogastric tube placement and serial abdominal examinations
  4. D
    Targeted abdominal ultrasonography
  5. E
    Fluoroscopy-guided pneumatic enema

Answer

Urgent operative intervention is the correct next step because the patient has signs of peritonitis and hemodynamic instability, mandating immediate laparotomy.
The correct approach is immediate surgical exploration. This neonate presents with bilious vomiting, shock, and a rigid abdomen, a clinical triad highly characteristic of midgut volvulus complicated by bowel ischemia. Malrotation occurs when the midgut fails to complete its normal 270-degree counterclockwise rotation during embryogenesis, leaving the bowel suspended by a narrow mesenteric pedicle that is prone to twisting (volvulus). When volvulus leads to vascular compromise, as evidenced by this patient's lethargy, hypotension, and peritonitis, any delay for diagnostic imaging (such as an upper GI series) significantly increases the risk of irreversible bowel necrosis and mortality. Immediate fluid resuscitation followed by a Ladd procedure (untwisting the bowel, dividing Ladd bands, and broadening the mesentery) is the standard of care.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and age.
A 12-day-old neonate presents with sudden onset of bilious (bright green) vomiting and inconsolable crying.
Bilious emesis in a neonate is a surgical emergency until proven otherwise and is classically indicative of intestinal malrotation with midgut volvulus.
2
Evaluate the patient's hemodynamic status and physical examination findings.
The infant exhibits severe tachycardia, hypotension, prolonged capillary refill, lethargy, and a rigid, distended abdomen with absent bowel sounds.
These findings indicate shock and peritonitis, suggesting that the twisted bowel is undergoing ischemia and necrosis.
3
Determine the appropriate management algorithm for an unstable patient with an acute surgical abdomen.
The correct action is to proceed directly to the operating room for exploratory laparotomy after initial fluid resuscitation.
Diagnostic imaging must be bypassed to prevent irreversible transmural bowel necrosis and death when peritonitis or hemodynamic instability is present.

Key Concept

In cases of suspected midgut volvulus, the presence of peritonitis or hemodynamic instability mandates immediate surgical exploration rather than diagnostic imaging.
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Topics

Pediatric Gastrointestinal Disorders

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