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Zorluk: OrtaPediatric Infectious Diseases

A 9-year-old boy is brought to the pediatrics clinic by his father due to a persistent cough for the past two weeks. The cough is dry, nonproductive, and frequently disrupts the patient's sleep. Over the past few days, he has also developed a mild sore throat, malaise, and a low-grade fever. His past medical history is unremarkable, and his immunizations are up to date. His temperature is 37.9°C (100.2°F), blood pressure is 105/65 mm Hg, pulse is 95/min, and respiratory rate is 22/min. Pulse oximetry shows 98% on room air. The patient appears comfortable and is in no acute distress. Physical examination of the chest reveals diffuse, bilateral fine crackles and occasional expiratory wheezes. A chest radiograph demonstrates bilateral, patchy interstitial infiltrates without pleural effusions or focal lobar consolidation. What is the most appropriate next step in management?

  1. Prescribe a course of oral azithromycinCevap
  2. B
    Prescribe a course of oral amoxicillin
  3. C
    Administer nebulized albuterol and oral corticosteroids
  4. D
    Admit to the hospital and administer intravenous ceftriaxone
  5. E
    Prescribe a course of oral oseltamivir

Cevap

Prescribe a course of oral azithromycin
The correct answer is to prescribe a course of oral azithromycin. This patient's clinical picture—an indolent, progressive, nonproductive cough accompanied by low-grade fever and malaise in a school-aged child—is highly characteristic of atypical community-acquired pneumonia. The chest radiograph demonstrating bilateral patchy interstitial infiltrates further supports this diagnosis. The most common causative organism in this age group is Mycoplasma pneumoniae. Because this organism lacks a rigid peptidoglycan cell wall, it is intrinsically resistant to beta-lactam antibiotics. Macrolides, such as azithromycin, are the first-line targeted pharmacotherapy. Furthermore, because the patient is well-appearing, well-oxygenated (98% on room air), and hemodynamically stable, outpatient management is the most appropriate clinical setting.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation.
The patient is a school-aged child with a two-week history of a gradual-onset, persistent, dry cough, low-grade fever, and malaise, while remaining generally well-appearing.
Identifying the timeline and severity helps differentiate between typical and atypical respiratory infections.
2
Interpret the physical examination and imaging findings.
The exam shows bilateral crackles and wheezes, and the chest radiograph reveals bilateral interstitial infiltrates without focal consolidation.
Bilateral interstitial patterns strongly suggest an atypical pneumonia rather than a typical lobar bacterial pneumonia.
3
Determine the most likely etiology and select the appropriate targeted therapy.
The presentation is classic for Mycoplasma pneumoniae ('walking pneumonia'). The treatment of choice is a macrolide antibiotic, such as oral azithromycin.
Mycoplasma pneumoniae lacks a cell wall, rendering beta-lactam antibiotics (like amoxicillin) ineffective. Macrolides target the bacterial ribosome and are the standard of care.

Anahtar Kavram

Diagnosis and management of atypical community-acquired pneumonia (Mycoplasma pneumoniae) in pediatric patients.
Tahmini Süre:1m 15s
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Pediatric Infectious Diseases

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