Final answer:
Tension pneumothorax is characterized by decreased/absent breath sounds on the affected side, JVD, hypotension, and tracheal deviation. If left untreated, it can be fatal.
Step-by-step explanation:
The signs and symptoms described in the question are indicative of a tension pneumothorax. Tension pneumothorax occurs when air accumulates in the pleural space, causing lung collapse and putting pressure on the heart and other organs. The decreased/absent breath sounds on the affected side, jugular venous distension (JVD), hypotension, and tracheal deviation to the opposite side are characteristic findings. If not promptly treated, tension pneumothorax can lead to cardiac arrest and death.