Prerenal acute kidney injury Quiz: Ace Your Exams
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A 67-year-old woman presents to the emergency department with a 4-day history of fatigue. Review of systems is negative, except that she has been experiencing increased knee pain recently. Her past medical history is significant for hypertension, for which she takes lisinopril, and osteoarthritis, for which she takes over-the-counter ibuprofen. Temperature is 98.9 F, pulse is 70/min, blood pressure is 140/86 mmHg, respiratory rate is 18/min, and oxygen saturation is 99% on room air. Mucous membranes appear moist. Stool guaiac is negative. Laboratory results are shown below. Which of the following historical features would most likely be the underlying cause of this patient’s acute renal injury?
| Laboratory Test | Result |
| Sodium | 135 g/dL |
| Potassium | 5.2 mEq/L |
| Chloride | 105 mEq/L |
| Bicarbonate | 29 mEq/L |
| BUN | 30 mg/dL |
| Creatinine | 1.8 mg/dL (baseline 1.0) |
| Hemoglobin | 10 g/dL |
| Urinalysis | unremarkable |
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