FCPaed(SA) Part II Practice Questions - Fellowship Of The College Of Paediatricians Of South Africa Part II FCPaed(SA) Part II Exam

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A term neonate develops persistent central cyanosis that does not improve with 100% oxygen (hyperoxia test). Pulse oximetry shows pre-ductal SpO2 82% and post-ductal SpO2 80%. What does a failed hyperoxia test most strongly suggest?
Correct Answer:
Congenital cardiac lesion with right-to-left shunting

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