In an unconscious 27-year-old female restrained driver from a head-on crash with a systolic BP around 70 and absent right radial pulse, which injury is most suspected?

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In blunt deceleration trauma, the great vessels can tear at the point where the aorta is most fixed, commonly the upper thoracic aorta near the ligamentum arteriosum. When a restrained driver from a head-on crash suffers a traumatic aortic rupture, blood pours into the chest cavity or mediastinum, causing rapid blood loss and a profound drop in blood pressure. The result is severe shock with absent distal (radial) pulses, even if there isn’t obvious external bleeding. This scenario—unconscious after a high-speed collision, very low systolic pressure, and no peripheral pulse—fits traumatic aortic rupture most tightly because it explains the abrupt, life-threatening internal hemorrhage that can occur with deceleration injuries.

Other injuries would present with more typical signs: spinal cord injury would show neurological deficits rather than instant circulatory collapse; tension pneumothorax would usually reveal chest findings like decreased breath sounds on one side, tracheal deviation, and neck vein distention; massive external hemorrhage would often involve obvious external bleeding or injuries that correlate with large-volume blood loss. The combination of mechanism and hemodynamics here points most strongly to rupture of the aorta as the suspected injury. This is a true emergency requiring rapid transport to a trauma center with continued airway, breathing, and circulation support.