A 45-year-old woman presents with BP 220/130 mmHg, severe headache, and confusion. Fundoscopy reveals bilateral papilloedema with flame-shaped hemorrhages and exudates (Grade IV). Serum creatinine is 2.6 mg/dL (baseline 0.9 mg/dL) with red cell casts in urine. What is the recommended target for BP reduction in the first hour?
- A Reduce BP to <120/80 mmHg within 1 hour
- B Reduce diastolic BP to <100 mmHg immediately
- C Reduce mean arterial pressure by no more than 25% in the first hour ✓
- D Reduce systolic BP by 80 mmHg within 30 minutes
Explanation
In hypertensive emergency with target organ damage (hypertensive encephalopathy, acute kidney injury, malignant hypertension with papilloedema), the safest initial target is a reduction of mean arterial pressure by no more than 20–25% within the first hour using IV agents (labetalol, sodium nitroprusside, or nicardipine). More rapid reduction risks cerebral or coronary hypoperfusion due to resetting of autoregulatory curves at high pressures. Over the next 2–6 hours, BP can be reduced to 160/100 mmHg, and then normalized over 24–48 hours. The exception is aortic dissection, where systolic <120 mmHg is urgently targeted.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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Written and medically reviewed by the StethoPrep medical team.