A 30-year-old man is brought to the emergency department with a knife wound to the chest. On visual inspection, asymmetry of chest movement during inspiration, displacement of the trachea, and absence...

1. A 30-year-old man is brought to the emergency department with a knife wound to the chest. On

visual inspection, asymmetry of chest movement during inspiration, displacement of the trachea,

and absence of breath sounds on the side of the wound are noted. His neck veins are distended,

and his pulse is rapid and thready. A rapid diagnosis of tension pneumothorax is made.

1. Discuss the pathogenesis of pneumothorax