Absent breath sounds – collapse — RACP Paediatrics MCQ

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ModerateRespiratoryAbsent breath sounds – collapseRACP Paediatrics

A 3-year-old with a known large mucus plug in the left main bronchus has complete left lung collapse on CXR. What auscultatory finding would you expect over the left hemithorax?

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Correct answer: D — Absent breath sounds

Complete lobar or lung collapse results in absent breath sounds over the affected area because there is no air entry into the collapsed lung. This is accompanied by dullness to percussion and decreased chest wall movement on the affected side. The trachea and mediastinum deviate towards the collapsed side.

Reference: RCH Melbourne – 2023 – Respiratory Examination CPG; RACP Paediatric Curriculum – Respiratory