A site for medical students - Practical,Theory,Osce Notes


What is Stridor?

Stridor can be laryngeal or tracheal in origin
Laryngeal stridor
High pitched crowing sound better heard during inspiration
Causes of laryngeal stridor are
  • Foreign body
  • Laryngeal spasm
  • Edema
  • Infection
  • Tumor
  • Bilateral vocal cord paralysis.
Tracheal stridor
It is a low pitched sound best heard in inspiration.
Croaking inspiratory sound or continuous sound increased by coughing, associated with inspiratory dyspnoea and indrawing of the suprasternal notch.
Causes of tracheal stridor are
  • Obstruction of the tracheal lumen by tumor or foreign body.