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Difficulty: MediumPediatric Respiratory Disorders

A 14-month-old boy is evaluated in the pediatric ward due to a new-onset fever and worsening work of breathing. He was admitted 3 days ago for respiratory distress secondary to respiratory syncytial virus (RSV) bronchiolitis. Yesterday, he was weaning off supplemental oxygen and tolerating oral feeds well. Today, his temperature is 39.0°C (102.2°F), blood pressure is 90/55 mm Hg, pulse is 155/min, and respiratory rate is 55/min. Pulse oximetry shows 91% on room air. Physical examination reveals intercostal retractions and new localized crackles over the right lower lung field, along with persistent diffuse expiratory wheezing. A chest radiograph demonstrates a new lobar consolidation in the right lower lobe. Blood cultures obtained during a febrile episode earlier today are rapidly growing Streptococcus pneumoniae that is susceptible to penicillin. Which of the following interventions are indicated in the current management of this patient? (Select all that apply)

  1. Targeted therapy with intravenous ampicillinAnswer
  2. B
    Scheduled treatments with inhaled short-acting beta-agonists
  3. Resumption of supplemental oxygen therapyAnswer
  4. D
    Empiric escalation to intravenous vancomycin and cefepime
  5. E
    Systemic therapy with intravenous methylprednisolone

Answer

The most appropriate interventions are targeted therapy with intravenous ampicillin and resumption of supplemental oxygen therapy.
This patient's clinical deterioration (new high fever, localized crackles, lobar consolidation) after initial improvement strongly suggests a secondary bacterial pneumonia complicating RSV bronchiolitis. The blood cultures explicitly demonstrate Streptococcus pneumoniae that is susceptible to penicillin. Therefore, targeted therapy with a narrow-spectrum antibiotic such as intravenous ampicillin is indicated. Furthermore, due to the infant's increased work of breathing and borderline oxygen saturation (91%), resuming supportive care with supplemental oxygen is a necessary concurrent step.

Step-by-Step Solution

1
Analyze the patient's new clinical findings against the expected illness course.
The patient developed a new high fever, worsening respiratory distress, localized crackles, and a focal consolidation on chest x-ray days into an RSV infection.
This presentation strongly points to a secondary bacterial pneumonia complicating the initial viral bronchiolitis.
2
Interpret the provided microbiological data.
Blood cultures confirm a Streptococcus pneumoniae infection that is susceptible to penicillin.
Antibiotic selection must be tailored to the culture and sensitivity results to practice proper antimicrobial stewardship.
3
Select the appropriate targeted antimicrobial therapy.
Intravenous ampicillin is chosen.
Ampicillin is a narrow-spectrum penicillin that effectively treats penicillin-susceptible S. pneumoniae.
4
Identify ongoing supportive care requirements.
Supplemental oxygen is resumed.
The patient has increased work of breathing and borderline hypoxia (91% on room air), warranting supportive respiratory care.

Key Concept

Secondary bacterial pneumonia can complicate viral bronchiolitis; management requires targeted, narrow-spectrum antibiotics based on culture susceptibility alongside ongoing supportive respiratory care.
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Topics

Pediatric Respiratory Disorders

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