A 55-year-old woman presents with severe headache, BP 220/130 mmHg, papilloedema, and serum creatinine rising from 1.0 to 2.8 mg/dL over 48 hours. Peripheral smear shows schistocytes. Which is the MOST appropriate initial antihypertensive choice for this hypertensive emergency with microangiopathic haemolytic anaemia (MAHA)?
- A Oral labetalol 200 mg stat
- B IV nicardipine or IV labetalol with target BP reduction of 20-25% in the first hour ✓
- C IV sodium nitroprusside; target normotension within 1 hour
- D IV hydralazine bolus every 20 minutes until BP <140/90
Explanation
Hypertensive emergency with end-organ damage (papilloedema, AKI, MAHA = thrombotic microangiopathy/malignant hypertension) requires controlled BP reduction in an ICU setting. The target is to reduce BP by no more than 20-25% within the first hour (or to ~160/100 mmHg), then gradually over the next 24-48 hours — overly rapid reduction risks ischaemic stroke (impaired cerebral autoregulation), coronary ischaemia, and renal infarction. IV nicardipine (titratable calcium channel blocker) or IV labetalol are preferred agents. Nitroprusside carries cyanide toxicity risk with prolonged use. Oral agents are inadequate for hypertensive emergency. Hydralazine boluses give unpredictable BP falls.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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