A postcardiac surgery client with a blood urea nitrogen (BUN) level of 45 mg/dL (16.2 mmol/L) and a serum creatinine level of 2.2 mg/dL XXXXXXXXXXmcmol/L) has a total 2-hour urine output of 25 mL. The...

A postcardiac surgery client with a blood urea nitrogen (BUN) level of 45 mg/dL (16.2 mmol/L) and a serum creatinine level of 2.2 mg/dL (193.6 mcmol/L) has a total 2-hour urine output of 25 mL. The nurse understands that the client is at risk for which condition?

1. Hypovolemia 2. Acute kidney injury 3. Glomerulonephritis 4. Urinary tract infection