A 32-year-old multiparous woman at 30 weeks of gestation is diagnosed with gestational hypertension (BP 145/95 mmHg on two occasions, 4 hours apart) with no proteinuria or symptoms. She requires pharmacological management. Which agent is the preferred first-line drug for chronic blood pressure control in this scenario?

Explanation

## Chronic Hypertension Management in Pregnancy **Key Point:** Labetalol is the preferred first-line antihypertensive for chronic blood pressure control in pregnancy because it combines alpha- and beta-blocking properties with an excellent safety profile and no adverse fetal effects. ### Labetalol: Pharmacology & Advantages Labetalol is a combined α₁- and β-adrenergic antagonist with a 7:1 β:α blocking ratio, resulting in: - Vasodilation without reflex tachycardia - Preserved placental and renal perfusion - No adverse fetal or neonatal effects - Oral bioavailability suitable for chronic dosing (200–800 mg/day in divided doses) ### Comparison of First-Line Agents in Pregnancy | Agent | Onset | Chronic Use | Fetal Safety | Preferred Setting | |-------|-------|------------|--------------|-------------------| | **Labetalol** | Moderate (2–4 hrs) | Excellent | Excellent | Chronic gestational HTN | | **Nifedipine SR** | Slow (6–8 hrs) | Good | Excellent | Chronic HTN; alternative | | **Hydralazine** | Slow (30–60 min IV) | Poor (unpredictable) | Good | Acute crisis only | | **Methyldopa** | Slow (4–6 hrs) | Good | Excellent | Second-line (less effective) | **High-Yield:** Labetalol is the first-line agent for chronic hypertension in pregnancy (gestational HTN, chronic HTN, preeclampsia without severe features). Nifedipine sustained-release is an acceptable alternative. Hydralazine is reserved for acute severe hypertensive crises. ### Clinical Pearl The patient has gestational hypertension (elevated BP without proteinuria or symptoms at 30 weeks). This requires chronic pharmacological management to prevent progression to preeclampsia. Labetalol's balanced α/β blockade, lack of fetal toxicity, and predictable pharmacokinetics make it ideal for this scenario. **Mnemonic:** **LATCH** — Labetalol, Alpha-beta blocker, Teratogen-free, Chronic use, Hypertension in pregnancy. [cite:ACOG Practice Bulletin 202; Williams Obstetrics 26e Ch 34]