A young adult with post-traumatic breathlessness, unconsciousness and rash

A 23-year-old Bangladeshi male was referred to our hospital for gradual worsening of breathlessness over 3 h, developed following a road-accident about 14 h previously. He had a close fracture of mid-shaft of his right tibia, which was immobilised with back slab at the previous healthcare facility. During presentation at the emergency department, he was conscious and oriented (Glasgow coma scale 15/15), tachycardic (heart rate 132 per min), blood pressure 100/70 mmHg, tachypnoeic (respiratory rate 34 per min) with oxygen saturation 89% on room air, and afebrile. Chest examination revealed restricted chest movement, hyper-resonant percussion notes and reduced breath sound on the left, and diffuse crackles on both sides.
Can you diagnose this young adult with post-traumatic breathlessness, unconsciousness and rash? http://bit.ly/2LlpkiV