Which is the drug of choice for severe preeclampsia?
**Core Concept**
The management of severe preeclampsia involves controlling blood pressure and preventing complications. **Preeclampsia** is a pregnancy complication characterized by high blood pressure and often accompanied by significant amounts of protein in the urine. The primary goal is to prevent **eclampsia**, which is the onset of seizures in a woman with preeclampsia.
**Why the Correct Answer is Right**
Given the severity of preeclampsia, the drug of choice should effectively lower blood pressure without causing significant maternal or fetal harm. **Magnesium sulfate** is commonly used for severe preeclampsia due to its ability to reduce blood pressure and prevent seizures. It acts as a cerebral vasodilator and has a neuroprotective effect.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while **methyldopa** is used in pregnancy-induced hypertension, it's not the first choice for severe preeclampsia.
**Option B:** Incorrect as **nifedipine** is used for mild to moderate hypertension but not typically the first line for severe preeclampsia.
**Option D:** Incorrect because **hydralazine** is used for acute blood pressure control but not the preferred choice for preventing seizures in severe preeclampsia.
**Clinical Pearl / High-Yield Fact**
Remember, **magnesium sulfate** is not only a treatment for severe preeclampsia but also a preventive measure against eclampsia. Its use is crucial in high-risk pregnancies.
**Correct Answer:** D. Magnesium sulfate.