skip to main content

Patent ductus arteriosus in prematurity — RACP Paediatrics MCQ

Instant feedback + full explanation. One question, done properly.

ModerateCardiologyPatent ductus arteriosus in prematurityRACP Paediatrics

A 26-week premature infant on day 5 has increasing oxygen requirement, bounding pulses and a continuous murmur. Chest X-ray shows pulmonary plethora and echocardiography demonstrates a large left-to-right ductal shunt. What is the most likely cause of the deterioration?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: C — Pulmonary overcirculation from a haemodynamically significant ductus arteriosus

A large PDA in a very preterm infant can cause pulmonary overcirculation, worsening respiratory status and bounding pulses. Right-to-left ductal shunting would more often cause cyanosis rather than pulmonary plethora. Echo findings must be interpreted with clinical respiratory and perfusion signs.

Reference: RACP Knowledge Guides; Neonatal PDA guidance