A patient had an open reduction with internal fixation (ORIF…

A patient had an open reduction with internal fixation (ORIF) for a compound fracture of the left tibia and has been placed in a long leg cast. The assessments by the nurse are: left foot warm/pink, pedal pulse weaker than right, capillary refill 3 seconds, and  3 cm area of dark drainage staining on the cast. What should the nurse do?