Management of Suspected Gestational Hypertension

Blood Pressure Thresholds and Urgent Treatment

Blood pressure ≥160/110 mmHg is a hypertensive emergency requiring immediate hospitalization and urgent treatment in a monitored setting, according to the American Heart Association 1, 2
Intravenous labetalol is used for urgent BP control 1, 2
Intravenous hydralazine is not a preferred option due to more perinatal adverse effects, as stated by the European Society of Cardiology 3, 4

For BP consistently ≥140/90 mmHg in clinic (or ≥135/85 mmHg at home), initiate antihypertensive therapy targeting diastolic BP of 85 mmHg and systolic BP 110-140 mmHg, as recommended by the American Heart Association 1, 2
Methyldopa has the most established safety profile as a first-line oral agent, according to the American College of Obstetricians and Gynecologists 1
Labetalol and nifedipine are also first-line oral agents, as stated by the American Heart Association 1

Gestational hypertension is NOT benign—approximately 25% progress to preeclampsia, with highest risk when diagnosed <34 weeks, as reported by the American Heart Association 1, 2
Urinalysis for proteinuria (≥300 mg/24h or dipstick ≥2+ indicates preeclampsia) is a crucial monitoring tool, according to the European Society of Cardiology 1, 4

BP measurement is essential at each visit, as recommended by the American Heart Association 1
Clinical assessment including neurological signs (headache, visual disturbances, hyperreflexia/clonus) is necessary, according to the American Heart Association 1, 2
Laboratory tests at minimum 28 and 34 weeks (more frequently if concerning features) include hemoglobin, platelet count, liver transaminases, serum creatinine, and uric acid, as stated by the American College of Obstetricians and Gynecologists 1

Begin ultrasound assessment at 26 weeks' gestation, including fetal biometry, amniotic fluid volume, and umbilical artery Doppler, as recommended by the American Heart Association 1, 2
Repeat every 2-4 weeks if normal; increase frequency if fetal growth restriction suspected, according to the American College of Obstetricians and Gynecologists 1

Admit immediately if BP ≥160/110 mmHg, as recommended by the American Heart Association 1, 2
Development of preeclampsia (new proteinuria) requires immediate hospitalization, according to the American College of Obstetricians and Gynecologists 1

If BP remains controlled, fetal monitoring reassuring, and preeclampsia has NOT developed, delivery can be delayed until 39+6 weeks, as stated by the American Heart Association 1, 2
Optimal delivery timing appears to be 38-39 weeks based on retrospective data, though this requires confirmation in randomized trials, according to the American College of Obstetricians and Gynecologists 2

If preeclampsia develops with severe hypertension OR neurological signs/symptoms, administer magnesium sulfate for seizure prophylaxis, as recommended by the American Heart Association 2
Loading dose: 4g IV or 10g IM, maintenance: 5g IM every 4 hours OR 1g/hour infusion, and continue until delivery and ≥24 hours postpartum, according to the American College of Obstetricians and Gynecologists 1

Home BP monitoring is a useful adjunct (approximately 75% of devices are accurate), as stated by the American Heart Association 1
Verify device accuracy against clinic sphygmomanometer for each patient, according to the American College of Obstetricians and Gynecologists 1

Do not underestimate gestational hypertension—it carries significant risk of progression to preeclampsia with associated maternal and fetal complications, as reported by the American Heart Association 1, 2
Avoid methyldopa postpartum due to risk of postnatal depression, as stated by the European Society of Cardiology 3
Do not use atenolol during pregnancy due to association with fetal growth retardation, according to the European Society of Cardiology 4
Avoid plasma volume expansion in preeclampsia (not recommended routinely), as stated by the American Heart Association 2