A 67-year-old woman develops oliguria and a creatinine rise from 84 to 310 micromol/L after several days of septic shock. Urinalysis shows 2+ blood but no significant protein, and microscopy reveals numerous coarse granular casts. Her fractional excretion of sodium is 3.2%, and renal ultrasound shows no hydronephrosis. Which diagnosis is most likely?
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