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Difficulty: MediumNeonatal Disorders

A female neonate born at 26 weeks gestation weighing 850 g (1 lb 14 oz) is evaluated on day 15 of life in the neonatal intensive care unit. The infant has been gradually advancing on enteral feeds with fortified human milk. Over the past 8 hours, the infant has developed temperature instability, lethargy, and one episode of bilious emesis. Nursing staff notes significantly increased gastric residual volumes. Vital signs are temperature 35.4°C (95.7°F), heart rate 175/min, respiratory rate 65/min, and blood pressure 42/22 mm Hg. Physical examination reveals a distended, tense, and erythematous abdomen with absent bowel sounds.

Laboratory studies show the following:

TestValue
Leukocyte count4,200/mm³ (18% band forms)
Hemoglobin12.5 g/dL
Platelet count75,000/mm³

An anteroposterior abdominal radiograph demonstrates dilated bowel loops, intramural air in the right lower quadrant, and branching radiolucencies over the hepatic shadow. There is no free air under the diaphragm. Enteral feeds are immediately discontinued, and an orogastric tube is placed for decompression.

Which of the following is the most appropriate next step in management?

  1. Initiation of broad-spectrum intravenous antibiotics and serial abdominal imagingAnswer
  2. B
    Emergency exploratory laparotomy and placement of a peritoneal drain
  3. C
    Initiation of enteral vancomycin and metronidazole therapy
  4. D
    Immediate transfusion of irradiated, leukocyte-reduced platelets
  5. E
    Application of topical antifungal therapy to the abdominal wall

Answer

Initiation of broad-spectrum intravenous antibiotics and serial abdominal imaging
The correct answer is the initiation of broad-spectrum intravenous antibiotics and serial abdominal imaging. This premature infant presents with classic signs of necrotizing enterocolitis (NEC), including feeding intolerance, bilious emesis, abdominal distension, and abdominal wall erythema. The radiograph confirms Bell Stage II NEC, evidenced by pneumatosis intestinalis (intramural air) and portal venous gas. At this stage, management is strictly medical and includes bowel rest (NPO), gastric decompression, intravenous fluid resuscitation, broad-spectrum intravenous antibiotics, and close monitoring with serial physical examinations and abdominal radiographs (typically every 6-12 hours). Surgery is not indicated unless there is clear evidence of intestinal perforation (e.g., pneumoperitoneum) or rapid clinical deterioration despite maximal medical therapy.

Step-by-Step Solution

1
Identify the clinical syndrome from the history and physical exam.
A premature infant with temperature instability, feeding intolerance, bilious emesis, and an erythematous, distended abdomen strongly suggests necrotizing enterocolitis (NEC).
Recognizing the classic presentation of NEC is critical for immediate triage in the NICU setting.
2
Interpret the diagnostic imaging findings.
The abdominal radiograph shows pneumatosis intestinalis (intramural air) and portal venous gas, but lacks free air under the diaphragm (no pneumoperitoneum).
These specific radiographic signs confirm Bell Stage II NEC and rule out a frank bowel perforation.
3
Determine the appropriate management phase based on staging.
Because there is no perforation, the patient requires maximal medical management (antibiotics, serial imaging, fluid resuscitation) rather than immediate surgical intervention.
Surgery carries high morbidity and is reserved for NEC cases with perforation (Stage III) or failure of medical management.

Key Concept

The management of unperforated necrotizing enterocolitis (NEC) relies on strict medical therapy including bowel rest, gastric decompression, and broad-spectrum intravenous antibiotics.
Estimated Time:1m 30s
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Topics

Neonatal Disorders

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