Most serious injury is at
open pneumothorax
diaphragmatic injury
Flail chest
Single rib fracture
Answer- A. open pneumothoraxThis is a large open defect in the chest (> 3 cm), leading to equilibration between intrathoracic and atmospheric pressure.Air accumulates in the hemithorax (rather than in the lung) with each inspiration, leading to profound hypoventilation on the affected side and hypoxia.