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Cyanotic Heart Disease — RACP Paediatrics MCQ

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ModerateCardiologyCyanotic Heart DiseaseRACP Paediatrics

A neonate with cyanosis (SpO2 72%) fails the hyperoxia test. CXR shows reduced pulmonary vascular markings with normal heart size. What is the most likely group of diagnoses?

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Correct answer: E — Cyanotic CHD with reduced pulmonary blood flow

Failure of PaO2 to rise on hyperoxia test with reduced pulmonary markings suggests right-sided obstructive lesions (TOF, pulmonary atresia, tricuspid atresia).

Reference: RCH Melbourne – 2024 – Clinical Practice Guidelines: Cyanotic Congenital Heart Disease