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Difficulty: MediumPediatric Respiratory Disorders

A 2-month-old female infant is brought to the pediatrician by her parents due to noisy breathing. The parents state they first noticed the sound when she was three weeks old. The noise is characterized as a high-pitched sound that is most prominent when the infant is crying, feeding, or lying in a supine position. The noisy breathing seems to partially resolve when she is asleep or placed in a prone position. She has had no fever, cough, or rhinorrhea. The infant breastfeeds vigorously, and her growth chart shows she has increased from the 50th percentile for weight at birth to the 60th percentile currently. On physical examination, vital signs are normal for her age. A high-pitched inspiratory sound is auscultated over the neck, but there is no evidence of cyanosis, intercostal retractions, or respiratory distress. Lung auscultation is otherwise clear bilaterally. Which of the following is the most appropriate next step in management?

  1. A
    Initiate a trial of nebulized albuterol
  2. B
    Refer for urgent supraglottoplasty
  3. Reassure the parents and observe clinicallyAnswer
  4. D
    Administer nebulized racemic epinephrine
  5. E
    Prescribe a course of oral amoxicillin

Answer

Reassure the parents and observe clinically.
The correct approach for a thriving infant with classic symptoms of laryngomalacia is clinical observation and reassurance. Laryngomalacia presents as an inspiratory stridor that is exacerbated by crying, feeding, or a supine position due to the dynamic collapse of immature supraglottic structures. Because this infant is gaining weight well and exhibits no signs of severe respiratory distress (like retractions or cyanosis), invasive diagnostics or surgical interventions are not indicated. The condition typically resolves on its own by 12 to 18 months of age.

Step-by-Step Solution

1
Analyze the patient's symptom characteristics and onset chronicity.
The infant has chronic, positional inspiratory stridor starting at 3 weeks of age, worsening when supine or crying, and improving when prone or asleep.
Identifying the onset and exacerbating factors points away from infectious causes and narrows the differential diagnosis to congenital upper airway anomalies.
2
Assess the infant's growth trajectory and overall clinical stability.
The infant is feeding well, gaining weight appropriately, and lacks signs of acute respiratory distress.
Determining the severity of the condition dictates whether invasive intervention is needed or if conservative management is sufficient.
3
Formulate a diagnosis and select the appropriate management plan.
The clinical picture confirms uncomplicated laryngomalacia, for which the gold standard of care is conservative observation.
Uncomplicated laryngomalacia resolves spontaneously by 12 to 18 months of age as the airway cartilages naturally mature and stiffen.

Key Concept

Laryngomalacia is the most common cause of inspiratory stridor in infants, characterized by supraglottic collapse that worsens when supine or agitated. In the absence of feeding difficulties or failure to thrive, it is managed conservatively with parental reassurance and observation.
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Topics

Pediatric Respiratory Disorders

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