system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Two days after undergoing emergent laparotomy with splenectomy for a grade IV splenic laceration sustained in a motor vehicle collision, a 54-year-old man develops decreased urinary output. His urine output is < 350 mL/day despite aggressive fluid resuscitation. During the emergent laparotomy, he required three units of packed RBCs. He has type 2 diabetes mellitus and is on an insulin sliding scale. His vital signs are within normal limits. Physical examination shows a healing surgical incision in the upper abdomen and multiple large ecchymoses of the superior right and left abdominal wall. His hematocrit is 28%, platelet count is 400,000/mm3, serum creatinine is 3.9 mg/dL, and serum urea nitrogen concentration is 29 mg/dL. Urinalysis shows brown granular casts. Which of the following is the most likely underlying cause of these findings?
assistant
Acute tubular necrosis