Review Question - QID 212375

A 65-year-old man is brought to the emergency department by ambulance after falling during a hiking trip. He was hiking with friends when he fell off a 3 story ledge and was not able to be rescued until 6 hours after the accident. On arrival, he is found to have multiple lacerations as well as a pelvic fracture. His past medical history is significant for diabetes and benign prostatic hyperplasia, for which he takes metformin and prazosin respectively. Furthermore, he has a family history of autoimmune diseases. Selected lab results are shown below:

Serum:
Na+: 135 mEq/L
Creatinine: 1.5 mg/dL
Blood urea nitrogen: 37 mg/dL

Urine:
Na+: 13.5 mEq/L
Creatinine: 18 mg/dL
Osmolality: 580 mOsm/kg

Which of the following is the most likely cause of this patient's increased creatinine level?