Continuous Renal-Replacement Therapy for Acute Kidney Injury Reply
Acute limb ischemia due to a perioperative type B (distal) thoracic aortic dissection develops in a 90-kg, 20-year-old man with Marfan's syndrome who is admitted to the hospital for elective aortic-valve replacement. On postoperative day 1, he undergoes endovascular repair of the thoracic aorta. On postoperative day 4, his urine output decreases to 420 ml over a 24-hour period. He requires mechanical ventilation with a fraction of inspired oxygen (FiO(2)) of 0.70; his mean arterial pressure is 74 mm Hg with vasopressor support. He has had a positive fluid balance of 9.8 liters since admission. The serum creatinine level has increased from a baseline of 0.6 mg per deciliter (53.0 mu mol per liter) to 4.4 mg per deciliter (389.0 mu mol per liter). The bicarbonate level is 19 mmol per liter despite bicarbonate infusion, and the potassium level is 6.1 mmol per liter. The creatine kinase level has increased to 129,040 U per liter. An intensive care specialist evaluates the patient and recommends initiation of continuous renal-replacement therapy.
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