Clinical Scenario:
A 1-year-old boy was admitted to the Pediatric Intensive Care Unit after a fall from height resulting in head injury. He has been mechanically ventilated for the past 5 days. During the last 12 hours, he developed a high-grade fever. Chest examination is unremarkable except for findings on investigation. Chest X-ray shows right-sided pulmonary infiltrates. Complete blood count reveals hemoglobin 12 g/dL, total leukocyte count 23,000/µL with 82% neutrophils, 15% lymphocytes, 1% monocytes, and 2% eosinophils.
What is the most likely diagnosis?
A. Lung collapse
B. Post-traumatic meningitis
C. Ventilator-associated pneumonia
D. Rib fracture leading to pneumonia
E. Ventilator-associated pneumothorax
Correct answer & Explanation:
Answer: C. Ventilator-associated pneumonia
Discussion: Ventilator associate pneumonia (VAP)
This child has developed fever, neutrophilic leukocytosis, and a new pulmonary infiltrate after more than 48 hours of mechanical ventilation, which is characteristic of ventilator-associated pneumonia (VAP). VAP is defined as pneumonia that develops 48–72 hours or more after endotracheal intubation and is one of the most common nosocomial infections in the intensive care unit.
Why not the other options?
- A. Lung collapse: May occur in ventilated patients but typically causes volume loss and collapse on chest X-ray rather than infective infiltrates and marked leukocytosis.
- B. Post-traumatic meningitis: Can occur after head injury but does not explain the new pulmonary infiltrates seen on chest X-ray.
- D. Rib fracture leading to pneumonia: Trauma may predispose to pneumonia, but there is no evidence of rib fracture in the history or investigations.
- E. Ventilator-associated pneumothorax: Usually presents with sudden respiratory deterioration and absent breath sounds. Chest X-ray would show air in the pleural space rather than infiltrates.
