Final answer:
The symptoms described suggest obstructive shock caused by a pneumothorax from blunt trauma. Treatment involves relieving the blockage and providing appropriate medical interventions.
Step-by-step explanation:
The symptoms described in the question suggest obstructive shock, which occurs when a significant portion of the vascular system is blocked. In this case, the blunt trauma has caused a pneumothorax, which is the presence of air in the thoracic cavity outside the lungs. This is leading to a constricted blood flow, resulting in flat neck veins, decreased breath sounds, dullness to percussion over one hemithorax, and contralateral tracheal deviation. Treatment for this condition often includes relieving the blockage and providing intravenous fluids or other medications, depending on the underlying cause.