In a patient with chronic hypertension on methyldopa who develops superimposed pre-eclampsia at 36 weeks with severe features, which antihypertensive is preferred for acute BP control given fetal considerations?

• A Oral nifedipine XL 30 mg
• B IV sodium nitroprusside
• C Oral atenolol 50 mg
• D IV labetalol 20 mg bolus ✓

Explanation

IV labetalol is a first-line agent for acute severe hypertension in pregnancy; it is a combined alpha-1 and non-selective beta-blocker that effectively lowers BP without compromising uteroplacental flow. While oral nifedipine is also acceptable (ACOG recommends either), IV labetalol is preferred when rapid parenteral control is needed. Sodium nitroprusside carries risk of fetal cyanide toxicity and is reserved as a last resort. Atenolol is associated with fetal growth restriction and is not recommended in pregnancy. IV hydralazine, labetalol, or oral nifedipine are the three ACOG-recommended agents for acute severe hypertension.

Reference: Williams Obstetrics, 26th ed.

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