A 55-year-old man presents with BP 230/130 mmHg, severe headache, blurred vision, and confusion. Fundoscopy shows bilateral papilledema and flame-shaped hemorrhages. Creatinine is 2.8 mg/dL (baseline 1.0). Which statement about initial BP management is MOST appropriate?
- A Reduce BP to <140/90 mmHg within 1 hour with oral nifedipine
- B Reduce BP to normal within 24 hours using oral amlodipine
- C Reduce mean arterial pressure by 20–25% within first hour using IV labetalol or nicardipine, then gradually to 160/100 by 6 hours ✓
- D Administer IV furosemide alone to rapidly lower BP
Correct answer: C. Reduce mean arterial pressure by 20–25% within first hour using IV labetalol or nicardipine, then gradually to 160/100 by 6 hours
Explanation
Hypertensive emergency with end-organ damage (encephalopathy, AKI, retinopathy) requires controlled reduction of MAP by 20–25% within the first hour using IV agents (labetalol, nicardipine, or sodium nitroprusside) — not to normal levels, as cerebral autoregulation is set at a higher threshold. Rapid normalization risks cerebral hypoperfusion, stroke, and coronary ischemia. Oral sublingual nifedipine is dangerous due to unpredictable absorption and precipitous BP drops. Goal in most emergencies is BP ~160/100 by 2–6 hours, then gradual normalization over 24–48 hours.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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Written and medically reviewed by the StethoPrep medical team.