<prompt> Answer this question truthfullyWhat are the four hard signs of arterial injury?  <response>: <reason> The four hard signs of arterial injury are:1. Distal limb ischemia reduced blood flow to the limb2. Absent distal pulses lack of pulse below the injury site3. Active hemorrhagerapidly expanding hematoma bleeding or swelling that is getting worse4. Bruit or thrill at the site of injury a humming or vibrating sensation or sound at the injury site. These signs indicate a high likelihood of arterial injury and require urgent evaluation and management. 