A 45-year-old man presents to the ER with BP 225/130 mmHg, severe headache, blurred vision, and confusion. Fundoscopy shows papilledema and flame-shaped hemorrhages. Serum creatinine is 2.8 mg/dL (was 1.0 mg/dL 2 months ago). Urine shows RBC casts and +++ proteinuria. What is the correct approach to lowering blood pressure in this hypertensive emergency?
- A Rapidly normalize BP to < 120/80 mmHg within the first 30 minutes with IV labetalol
- B Reduce mean arterial pressure by no more than 20–25% in the first hour, then gradually over 24–48 hours using IV labetalol or nicardipine ✓
- C Start oral amlodipine and recheck BP in 4 hours
- D Administer sublingual nifedipine for rapid BP reduction
Correct answer: B. Reduce mean arterial pressure by no more than 20–25% in the first hour, then gradually over 24–48 hours using IV labetalol or nicardipine
Explanation
In hypertensive emergency with end-organ damage (hypertensive encephalopathy, papilledema, acute kidney injury), the goal is a controlled reduction of mean arterial pressure by 20–25% in the first hour using titratable IV antihypertensives (labetalol, nicardipine, clevidipine, or sodium nitroprusside). Overly rapid BP reduction causes cerebral and renal hypoperfusion due to shifted autoregulation curves, worsening ischemia. Sublingual nifedipine is contraindicated due to unpredictable rapid drops. Oral agents are insufficient for emergency management.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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