Atrial Septal Defect — RACP Paediatrics MCQ

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ModerateCardiologyAtrial Septal DefectRACP Paediatrics

A 3-month-old has an ejection systolic murmur at the LUSE with a widely fixed split S2. CXR shows mildly increased pulmonary markings. Most likely diagnosis?

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Correct answer: C — ASD (secundum)

Widely fixed split S2 is the hallmark of ASD. The systolic murmur is a flow murmur across the pulmonary valve.

Reference: RCH Melbourne – 2024 – Clinical Practice Guidelines: Atrial Septal Defect