A 55-year-old woman presents with BP 220/130 mmHg, severe headache, papilledema, and urinalysis showing RBC casts and protein 3+. Serum creatinine has risen from 1.0 to 2.8 mg/dL over 3 days. This is hypertensive emergency with thrombotic microangiopathy on kidney biopsy. What is the target BP reduction in the first hour?
- A Normalize BP to <140/90 within 2 hours
- B Reduce MAP by 10% within the first 30 minutes, then slowly
- C Reduce mean arterial pressure (MAP) by 25% within the first hour ✓
- D No specific target — reduce BP as fast as possible
Explanation
Per ACC/AHA and ESC hypertensive emergency guidelines, the initial target is to reduce MAP by no more than 25% within the first hour — aggressive BP normalization risks cerebral, renal, and coronary hypoperfusion in vessels with impaired autoregulation. After stabilization, BP should be brought to 160/100 mmHg over the next 2–6 hours, then normalized over 24–48 hours. Exceptions: in aortic dissection, target SBP <120 within 20 minutes; in ischemic stroke, specific thresholds apply. IV labetalol, nicardipine, or nitroprusside are agents of choice for gradual controlled reduction.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.