Differentiating different respiratory sounds can be asked in clinical exams

Wheeze is the high pitch musical sound heard

Characters

  • Mostly heard in expiratory phase of respiration
  • Indicates small airway obstruction

Conditions

  • Asthma
  • Bronchitis
  • Tropical eosinophilia

Stridor

This is a harsh hoarse sound which is low pitched

Features

  • Better heard in Inspiratory phase
  • Indicates large airways obstruction

Conditions

  • Foreign body
  • Whooping cough
  • Croup
  • Acute epiglottitis
  • Subglottic stenosis

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