For pregnant women with chronic hypertension, BP should be maintained between systolic 120-160mmHg and diastolic 80-105mmHg
Either labetalol or hydralazine can be used for initial control.  Maximize the dose of each drug before adding on additional therapy.
Labetalol
Option 1: Initial 10-20mgIV; then doses of 20-80mg IV q20-30min PRN to total of 300mg
Option 2: Constant IV infusion of 1-2mg/min
Hydralazine
Option 1: 5mg IV or IM, then 5-10mg IV q20-40min PRN to total of 30mg
Option 2: Constant infusion 0.5-10mg/hr
Nifedipine
Option 1: 10-20mg PO, repeat in 30 minutes PRN; then 10-20mg q 2-6 hours
Option 1: Initial 10-20mgIV; then doses of 20-80mg IV q20-30min PRN to total of 300mg
Option 2: Constant IV infusion of 1-2mg/min
Option 1: 5mg IV or IM, then 5-10mg IV q20-40min PRN to total of 30mg
Option 2: Constant infusion 0.5-10mg/hr
Option 1: 10-20mg PO, repeat in 30 minutes PRN; then 10-20mg q 2-6 hours
These meds can be used safely to control hypertension of pregnancy
Labetalol
Option 1: 200-2400mg/d in two to three divided doses
Nifedipine ER
Option 1: 30-120mg/d
Methyldopa
Option 1: 0.5-3 g/d in two to three divided doses
Thiazide diuretics - used as second line agent
ACE Inhibitor/ARB - CONTRAINDICATED IN PREGNANCY DUE TO TERATOGENICITY
Option 1: 200-2400mg/d in two to three divided doses
Option 1: 30-120mg/d
Option 1: 0.5-3 g/d in two to three divided doses<unk>  without severe features, delivery at 37 weeks<unk>  with severe features
Before fetal viability, delivery after maternal stabilization, expectant management is not recommended
Viable fetus at 33 6/7 weeks or less may delay delivery for 48 hours of corticosteroids if maternal and fetal conditions remain stable with any of the following:
PPROM
Labor
Low platelet count <100,000mL<unk> rsistent abnormal LFT(2x normal concentration)
IUGR<5%
Severe oligohydramnios (AFI<5cm)
Reversed end diastolic flow on umbilical artery Doppler studies
New onset renal dysfunction or increasing renal dysfunction.
Do not delay delivery after initial maternal stabilization regardless of gestational age for women with PreE with severe features complicated by any of the following:
Uncontrollable severe hypertension
Eclampsia
Pulmonary edema
Placental abruption
Disseminated intravascular coagulation
Evidence of nonreassuring fetal status
Intrapartum fetal demise
Before fetal viability, delivery after maternal stabilization, expectant management is not recommended
Viable fetus at 33 6/7 weeks or less may delay delivery for 48 hours of corticosteroids if maternal and fetal conditions remain stable with any of the following:
PPROM
Labor
Low platelet count <100,000mL<unk> rsistent abnormal LFT(2x normal concentration)
IUGR<5%
Severe oligohydramnios (AFI<5cm)
Reversed end diastolic flow on umbilical artery Doppler studies
New onset renal dysfunction or increasing renal dysfunction.
PPROM
Labor
Low platelet count <100,000mL<unk> rsistent abnormal LFT(2x normal concentration)
IUGR<5%
Severe oligohydramnios (AFI<5cm)
Reversed end diastolic flow on umbilical artery Doppler studies
New onset renal dysfunction or increasing renal dysfunction.
Uncontrollable severe hypertension
Eclampsia
Pulmonary edema
Placental abruption
Disseminated intravascular coagulation
Evidence of nonreassuring fetal status
Intrapartum fetal demise
The USPSTF recommends the use of low-dose aspirin (81mg/d) as preventive medication after 12 weeks of gestation in women who are at high risk for<unk> . ( B recommendation)<unk> r ACOG Task Force: For women with prior<unk>  that led to delivery before 34 weeks of gestation or occurring in more than one pregnancy, offer daily low-dose aspirin (81mg or less) late in the first trimester.
Preeclampsia
Amniotic fluid embolus
Eclampsia
Chorioamnionitis
Comorbid diseases in pregnancy
Acute fatty liver of pregnancy
HELLP syndrome
Postpartum hemorrhage