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
Nine days after being treated for a perforated gastric ulcer and sepsis, a 78-year-old woman develops decreased urinary output and malaise. She required emergency laparotomy and was subsequently treated in the intensive care unit for sepsis. Blood cultures grew Pseudomonas aeruginosa. The patient was treated with ceftazidime and gentamicin. She has type 2 diabetes mellitus, arterial hypertension, and osteoarthritis of the hips. Prior to admission, her medications were insulin, ramipril, and ibuprofen. Her temperature is 37.3°C (99.1°F), pulse is 80/min, and blood pressure is 115/75 mm Hg. Examination shows a healing surgical incision in the upper abdomen. Laboratory studies show:
Hemoglobin count 14 g/dL
Leukocyte count 16,400 mm3
Segmented neutrophils 60%
Eosinophils 2%
Lymphocytes 30%
Monocytes 6%
Platelet count 260,000 mm3
Serum
Na+ 137 mEq/L
Cl- 102 mEq/L
K+ 5.1 mEq/L
Urea nitrogen 25 mg/dL
Creatinine 4.2 mg/dL
Fractional excretion of sodium is 2.1%. Which of the following findings on urinalysis is most likely associated with this patient's condition?"
assistant
Muddy brown casts