A 42-year-old man is hit on the left side of his body by a car and is brought to the emergency department with fractures of the left tenth, eleventh, and twelfth ribs and left tibia and fibula fractures. The patient's blood pressure is 120/90 mm Hg, pulse rate is 100 bpm, and respiration rate is 24 breaths per minute. He has hematuria and left flank pain. Intravenous lines are inserted. IVP shows no excretion from the left kidney but normal excretion from the right. What would be the next step in management?