56-year-old male with severe headache and blurred vision
A 56-year-old male cabinetmaker presents to the emergency department with 3 days of severe headache, blurred vision, and dyspnea. Three weeks ago, he was prescribed prednisone for diffuse hand swelling. He notes recent cold-induced digital pallor and cyanosis. Blood pressure is 186/104 mm Hg, and pulse is 92/min. Examination shows taut, thickened skin over the fingers and forearms, digital pitting scars, and bilateral retinal hemorrhages. Serum creatinine is 2.6 mg/dL (baseline 0.9 mg/dL), hemoglobin is 10.2 g/dL, and platelets are 84,000/mm3. Peripheral smear demonstrates schistocytes. Urinalysis reveals 1+ protein with microscopic hematuria and no casts. Which of the following is the most appropriate next step in management?
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A
Explanation
Clinical Pearl:
Scleroderma renal crisis typically presents with new severe hypertension, acute kidney injury, and microangiopathic hemolytic anemia, often triggered by glucocorticoid therapy. Prompt administration of an angiotensin-converting enzyme inhibitor is the definitive life-saving intervention.
Explanation:
This patient has scleroderma renal crisis, a life-threatening complication characterized by acute severe hypertension, acute kidney injury, and microangiopathic hemolytic anemia, frequently triggered by glucocorticoid exposure. Immediate initiation of an angiotensin-converting enzyme inhibitor such as oral captopril is the established cornerstone of therapy, reversing renal vasoconstriction and dramatically reducing mortality. Intravenous labetalol fails to counter the massive hyperreninemia driving the renal ischemia and may exacerbate peripheral vasospasm. Intravenous methylprednisolone is contraindicated because high-dose corticosteroids trigger and worsen this vascular crisis. Therapeutic plasma exchange treats primary thrombotic microangiopathies such as thrombotic thrombocytopenic purpura but confers no benefit here, as the fragmentation hemolysis is purely secondary to malignant vasospasm. Urgent hemodialysis is premature without refractory electrolyte abnormalities, severe volume overload, or uremic signs, and does not treat the underlying vasoconstrictive cascade.
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