Management of Preeclampsia

Acute Blood Pressure Management

The European Society of Cardiology recommends nicardipine as a safe and effective first-line agent for severe preeclampsia requiring intravenous blood pressure control, started at 5 mg/hour and titrated by 2.5 mg/hour every 5-15 minutes to a maximum of 15 mg/hour, with the goal of lowering blood pressure to <160/105 mmHg 1, 2, 3
The initial dose of nicardipine is 5 mg/hour IV infusion, with titration by 2.5 mg/hour every 5-15 minutes until target BP is achieved 1, 2
The maximum dose of nicardipine is 15 mg/hour 1, 2
The onset of action of nicardipine is 1-5 minutes, with a duration of effect of 4-6 hours 2
The target blood pressure for nicardipine therapy is systolic <160 mmHg and diastolic <105-110 mmHg 1, 3

The American College of Cardiology warns against combining nicardipine (or any calcium channel blocker) with magnesium sulfate without extremely careful monitoring, as this combination can cause precipitous hypotension and myocardial depression 2, 4, 5
Nicardipine is contraindicated in liver failure 1, 2

The American College of Obstetricians and Gynecologists recommends magnesium sulfate for eclampsia prevention in all women with severe preeclampsia (BP ≥160/110 mmHg with significant proteinuria ≥3+) or those with moderate hypertension (≥150/100 mmHg) plus proteinuria ≥2+ with neurological symptoms (headache, visual disturbances, hyperreflexia) 6, 5
The standard magnesium sulfate regimen consists of a loading dose of 4-6 grams IV over 20-30 minutes, followed by a maintenance infusion of 2 grams/hour IV 7, 5

The European Society of Cardiology recommends limiting total fluid intake to 60-80 mL/hour to prevent pulmonary edema in preeclamptic patients who have capillary leak and reduced plasma volume 3, 6, 5
Diuretics should be avoided as plasma volume is already reduced in preeclampsia 3

Continuous fetal heart rate monitoring is necessary when using IV antihypertensives 1
The patient should be monitored for fetal bradycardia, especially if labetalol is also used 1

In cases of preeclampsia with pulmonary edema, nitroglycerin (glycerol trinitrate) 5 mcg/min IV should be used, increased every 3-5 minutes to maximum 100 mcg/min, instead of nicardipine or other calcium channel blockers 2, 3

The American Heart Association warns against combining calcium channel blockers with magnesium sulfate without intensive monitoring due to severe hypotension risk 2, 4, 5
Hydralazine should not be used as first-line for acute BP control—it is associated with adverse perinatal outcomes and is second-line only 2, 3
Nitroprusside should be avoided due to risk of fetal cyanide toxicity 1, 4

The American College of Obstetricians and Gynecologists states that delivery is the only definitive treatment for preeclampsia 4
Once maternal condition is stabilized with BP control and magnesium sulfate, delivery should be planned regardless of gestational age in severe preeclampsia 2, 3