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Patent Ductus Arteriosus — RACP Paediatrics MCQ

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EasyCardiologyPatent Ductus ArteriosusRACP Paediatrics

A newborn infant has a continuous 'machinery' murmur heard best at the left infraclavicular area. Bounding peripheral pulses and a wide pulse pressure are noted. An echocardiogram confirms a patent ductus arteriosus (PDA). At what age is spontaneous closure of a PDA no longer expected in a term infant?

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Correct answer: A — 72 hours

In a term infant, functional closure of the ductus arteriosus normally occurs within 24–48 hours of birth, with complete anatomical closure by 2–3 weeks. If a significant PDA persists beyond 72 hours in a term infant, spontaneous closure becomes less likely and referral for echocardiography is warranted.

Reference: RCH Melbourne – 2024 – Clinical Practice Guidelines: Patent Ductus Arteriosus