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Difficulty: HardPediatric Respiratory Disorders

A 5-month-old girl is brought to the pediatric clinic by her parents due to noisy breathing that has been present since she was 2 months old. The parents report that she frequently makes a harsh, grating sound when breathing, which seems to worsen when she is crying or feeding. They have also noticed that she often tilts her head backward, which appears to ease her breathing. Over the past month, she has had episodes of choking and regurgitation during feedings, leading to poor weight gain. She has no history of fever, rhinorrhea, or cough. Two weeks ago, she was diagnosed with suspected reactive airway disease at an urgent care center and was prescribed an albuterol inhaler, which has provided no relief. Her current weight is at the 10th percentile for her age. Physical examination reveals an alert infant with biphasic stridor and mild subcostal retractions.

Which of the following is the most appropriate next step to establish the diagnosis in this patient?

  1. Computed tomography angiography of the chestAnswer
  2. B
    Escalation of therapy with oral corticosteroids
  3. C
    Reassurance that the symptoms will resolve by age two
  4. D
    Measurement of sweat chloride concentration
  5. E
    Initiation of oral amoxicillin-clavulanate

Answer

Computed tomography angiography of the chest
This infant's presentation of biphasic stridor that worsens with feeding and improves with neck extension is classic for a vascular ring (e.g., double aortic arch). A vascular ring is a congenital anomaly where the aortic arch and its branches completely encircle and compress both the trachea and the esophagus. This dual compression leads to concurrent respiratory symptoms (stridor, wheezing) and gastrointestinal symptoms (choking, regurgitation, poor weight gain). Neck extension stretches the trachea and pulls it anteriorly, temporarily relieving the compression. To definitively diagnose the condition and delineate the specific vascular anatomy for surgical planning, advanced cross-sectional imaging, such as computed tomography angiography (CTA) or magnetic resonance angiography (MRA) of the chest, is the most appropriate next step.

Step-by-Step Solution

1
Analyze the patient's age and symptom timeline.
A 5-month-old infant with chronic, progressive noisy breathing and feeding difficulties since 2 months of age.
Establishing the chronicity helps differentiate congenital structural anomalies from acute infectious processes.
2
Evaluate the key physical exam and historical findings.
The presence of biphasic stridor that worsens with feeding and improves with neck extension, alongside choking and poor weight gain.
Neck extension relieves anterior tracheal compression. The combination of airway compression (stridor) and esophageal compression (dysphagia) is the hallmark of a vascular ring.
3
Determine the optimal diagnostic modality.
Computed tomography angiography (CTA) of the chest.
Advanced cross-sectional vascular imaging is required to visualize the vessels encircling the trachea and esophagus to confirm the diagnosis of a vascular ring and plan for surgical correction.

Key Concept

Vascular rings present in infancy with concurrent respiratory (stridor that improves with neck extension) and gastrointestinal (dysphagia, choking) symptoms. Diagnosis is confirmed with advanced vascular imaging like CTA or MRA.
Estimated Time:1m 30s
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Topics

Pediatric Respiratory Disorders

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