Latest guidelines for management of hypertension in pregnancy

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Here is a comprehensive summary of the current guidelines on management of hypertension in pregnancy, drawn from retrieved sources (ESC Management of Cardiovascular Disease and Pregnancy and ACC/AHA Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults), supplemented with established clinical knowledge.

Management of Hypertension in Pregnancy

1. Classification of Hypertensive Disorders of Pregnancy (HDP)

Disorder	Definition
Chronic (pre-existing) hypertension	BP ≥140/90 mmHg diagnosed before pregnancy or before 20 weeks' gestation
Gestational hypertension	New-onset BP ≥140/90 mmHg at ≥20 weeks, no proteinuria or organ dysfunction
Preeclampsia	New-onset BP ≥140/90 mmHg at ≥20 weeks + proteinuria (≥300 mg/24h, PCR ≥30 mg/mmol) or end-organ dysfunction
Preeclampsia superimposed on chronic HTN	Worsening HTN + new proteinuria/organ dysfunction in known chronic HTN
Eclampsia	Preeclampsia + generalised seizures

Classification depends on gestational age at diagnosis and presence of target organ involvement (ACC/AHA Guidelines, p. 65).

BP Thresholds

Hypertension: SBP ≥140 mmHg and/or DBP ≥90 mmHg on 2 readings ≥4 hours apart
Severe hypertension: SBP ≥160 mmHg or DBP ≥110 mmHg — verify within 15 minutes to avoid treatment delays
BP naturally falls ~10% in early pregnancy, nadirs in 2nd trimester, returns to baseline by 3rd trimester — this affects diagnostic thresholds (ACC/AHA, p. 65)

Use BP monitors validated for pregnancy (see validatebp.org)

2. Diagnosis of Preeclampsia

Preeclampsia is diagnosed by new-onset hypertension at ≥20 weeks PLUS any of:

Proteinuria ≥300 mg/24h (or PCR ≥30 mg/mmol)
Thrombocytopenia (<100,000/μL)
Renal insufficiency (creatinine >97 μmol/L)
Impaired liver function (transaminases ≥2× upper limit of normal)
Pulmonary oedema
New-onset headache unresponsive to analgesia, or visual disturbances

HELLP syndrome = Haemolysis + Elevated Liver enzymes + Low Platelets — a severe variant.

3. Prevention

Low-dose aspirin (75–150 mg/day) from 12 weeks to delivery in women at high risk of preeclampsia (prior preeclampsia, chronic HTN, diabetes, renal disease, multifetal pregnancy, or ≥3 moderate risk factors)
Calcium supplementation (1.5–2 g/day) in women with low dietary calcium intake

4. Antihypertensive Drug Treatment

When to Start

Severity	Target
Non-severe (140–159/90–109 mmHg)	Treat to maintain BP <140/90 mmHg (new ACOG/NICE guidance); some guidelines use <150/100 mmHg as minimum threshold
Severe (≥160/110 mmHg)	Urgent treatment within 30–60 minutes to prevent stroke and organ damage

Drug Choices

First-line oral agents:

Drug	Dose	Notes
Labetalol	200 mg BD–TID (up to 2400 mg/day)	α+β blocker; preferred in many guidelines
Methyldopa	250–500 mg TID/QID	Long safety record; avoid in depression
Nifedipine (modified-release)	30–60 mg/day	Calcium channel blocker; avoid short-acting formulation

For acute severe hypertension (IV/urgent oral):

IV Labetalol: 20 mg bolus → repeat/increase every 10 min (max 300 mg); or infusion
IV Hydralazine: 5 mg bolus every 20 min
Oral/sublingual Nifedipine: 10 mg short-acting (immediate effect within 20 min)

Contraindicated in pregnancy:

ACE inhibitors (e.g., enalapril, ramipril)
ARBs (e.g., losartan)
Direct renin inhibitors
Atenolol (associated with fetal growth restriction)

5. Management of Preeclampsia

Definitive Treatment

Delivery is the only cure. Timing depends on severity:

Scenario	Delivery
Preeclampsia without severe features	≥37 weeks (or earlier if deterioration)
Preeclampsia with severe features	≥34 weeks; at any gestation if maternal/fetal compromise
Eclampsia	Stabilise → deliver

Magnesium Sulfate

Indication: Prevention and treatment of eclamptic seizures in severe preeclampsia/eclampsia
Loading dose: 4–6 g IV over 15–20 minutes
Maintenance: 1–2 g/hour IV infusion for 24 hours post-delivery
Monitoring: UO (>25 mL/hr), respiratory rate (>12/min), deep tendon reflexes (loss = early toxicity)
Antidote: Calcium gluconate 1 g IV

Fluid Management

Restrict fluids to 80 mL/hr (or less) to avoid pulmonary oedema — preeclampsia causes increased capillary permeability.

6. Postpartum Management

(ESC Management of Cardiovascular Disease and Pregnancy, p. 80)

BP can worsen in the first 3–5 days postpartum
New-onset postpartum hypertension with organ dysfunction → evaluate for postpartum preeclampsia/eclampsia (see algorithm above)
Continue antihypertensives postpartum; review at 6 weeks
Avoid NSAIDs (e.g., ibuprofen) in hypertensive women postpartum — may worsen BP
Breastfeeding-compatible drugs: labetalol, nifedipine, methyldopa, enalapril (postpartum only)

7. Fetal Monitoring

Serial ultrasound for fetal growth restriction (FGR) every 2–4 weeks
Umbilical artery Doppler in FGR or preeclampsia
Cardiotocography (CTG) if reduced fetal movements or signs of fetal compromise

8. Risk Stratification for Future Pregnancies / Long-term

Women with preeclampsia have 2× lifetime risk of cardiovascular disease
Annual BP check, assess metabolic risk factors
Aspirin prophylaxis in subsequent pregnancies if prior preeclampsia

Key Sources: ESC Management of Cardiovascular Disease and Pregnancy (p. 56, 80); ACC/AHA 2017 Hypertension Guidelines (p. 65); ACOG Practice Bulletin on Gestational Hypertension and Preeclampsia (2020, reaffirmed 2023); NICE Guideline NG133 (Hypertension in Pregnancy, 2019, updated 2023).

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