Your patient was stabbed with an unknown weapon in the left upper chest. First responders applied an occlusive dressing and secured it with tape on all four sides. Upon your arrival, the patient is now unconscious with bulging neck veins, tracheal deviation to the right, poor chest rise on the left, and barely palpable pulses. You recognize this injury as ________, and your first action should be to________.

The following subject areas are covered in the EMT Basic Exam:    
- Airway techniques    
- Patient assessment    
- Medical emergencies    
- Trauma    
- Treatment of infants and children    
- Operations    
- Advanced airway maneuvers    
- Anatomy and physiology