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Difficulty: HardPediatric Infectious Diseases

An 11-month-old boy is brought to the pediatric emergency department due to a 5-day history of high fever, harsh cough, nasal discharge, and red, watery eyes. Yesterday, a rash appeared on his face and has now spread down to his chest and back. His parents immigrated to the United States 3 months ago, and his immunization records are unavailable. His temperature is 39.6°C (103.3°F), heart rate is 165/min, and respiratory rate is 52/min with an oxygen saturation of 91% on room air. Physical examination reveals an irritable infant with a confluent, erythematous, maculopapular rash on the face, neck, and upper trunk. The oral mucosa has tiny white lesions on an erythematous base located on the inner cheeks. Lung auscultation reveals diffuse crackles and expiratory wheezing bilaterally. Chest radiography demonstrates diffuse, bilateral interstitial infiltrates without focal consolidation or pleural effusion. Which of the following is the most appropriate next step in the management of this patient?

  1. Initiate oral vitamin A therapyAnswer
  2. B
    Administer intravenous ceftriaxone and vancomycin
  3. C
    Administer the live-attenuated measles, mumps, and rubella (MMR) vaccine
  4. D
    Administer nebulized albuterol and oral dexamethasone
  5. E
    Administer intravenous acyclovir

Answer

Initiate oral vitamin A therapy
The correct answer involves administering oral vitamin A. This patient presents with the classic manifestations of measles (rubeola), including the prodrome of cough, coryza, and conjunctivitis, accompanied by Koplik spots and a cephalocaudal maculopapular rash. His significant respiratory distress, hypoxemia, and diffuse interstitial infiltrates indicate measles pneumonia, which is the leading cause of death associated with this viral infection. Vitamin A deficiency is known to contribute to increased severity of measles, and supplementation with oral vitamin A promotes respiratory and gastrointestinal epithelial repair, enhances the immune response, and has been shown to significantly reduce morbidity and mortality in children with severe measles. It should be administered immediately upon diagnosis in the hospital setting.

Step-by-Step Solution

1
Identify the primary diagnosis based on the clinical presentation.
The patient has a classic prodrome of the '3 Cs' (cough, coryza, conjunctivitis), pathognomonic Koplik spots (white lesions on the buccal mucosa), and a cephalocaudal maculopapular rash, which definitively point to measles (rubeola).
Recognizing the pathognomonic signs of measles is essential for guiding the subsequent management.
2
Evaluate the patient for complications of the primary disease.
The patient is hypoxemic (91% on room air), tachypneic, and has diffuse bilateral infiltrates on chest radiography, indicating measles pneumonia.
Measles pneumonia is the most common cause of measles-related mortality, requiring prompt and specific intervention.
3
Determine the most appropriate targeted therapy to reduce mortality in this specific scenario.
Oral vitamin A therapy is indicated for this patient.
The World Health Organization (WHO) and the American Academy of Pediatrics (AAP) strongly recommend vitamin A supplementation for children with acute measles, as it has been proven to significantly reduce morbidity and mortality, particularly in cases complicated by pneumonia.

Key Concept

Administration of vitamin A reduces morbidity and mortality in patients with severe measles, particularly those with complications such as pneumonia.
Estimated Time:1m 15s
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Topics

Pediatric Infectious Diseases

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