Due to rupture of of apical blebs, air accumulates in the pleural space.
Spontaneous pneumothorax is more common in taller and thinner individuals.
Spontaneous pneumothorax is more common in individuals with underlying disease of the small airways. Examples of this include interstitial lung disease, infection of the lung, lung cancer, COPD, and connective tissue diseases.
The mechanism for formation of these blebs or bulla is unknown but have been attributed to congenital abnormalities, inflammation of the bronchioles and disturbances of the collateral ventilation.
Dyspnea and chest pain are the most common symptoms.
Ventilation-perfusion mismatch can lead to decreased PaO2.
Decreased breath sounds are heard due to presence of air in the pleural space.
Increased intrapleural pressure can lead to hyperresonance on percussion.
Dyspnea (SOB) and chest pain are the most common symptoms.
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