Gestational Hypertension in Hyderabad — Blood Pressure Management in Pregnancy

Gestational Hypertension vs Preeclampsia — Critical Differences

Gestational hypertension and preeclampsia both involve elevated BP after 20 weeks — but preeclampsia includes additional organ involvement. The key distinctions:

• Gestational hypertension: BP ≥140/90, no proteinuria, no organ damage
• Preeclampsia: BP ≥140/90 PLUS proteinuria (PCR >30 mg/mmol) or features of severe disease (thrombocytopaenia, renal impairment, elevated liver enzymes, pulmonary oedema, new-onset headache, visual disturbances)
• Up to 25% of women with gestational hypertension will progress to preeclampsia — hence close monitoring is essential
• If any concerning symptoms develop, management escalates immediately to the preeclampsia pathway

Chronic Hypertension vs Gestational Hypertension

Chronic (pre-existing) hypertension is present before 20 weeks or diagnosed before pregnancy. Gestational hypertension arises de novo after 20 weeks in a previously normotensive woman. Women with chronic hypertension are at higher risk of developing superimposed preeclampsia — one of the most dangerous forms — and require intensive monitoring throughout pregnancy. Both conditions are managed at Mother Hospitals under our high-risk obstetrics pathway.

BP Monitoring — Frequency Schedule

The frequency of BP checks depends on severity:

• Mild GH (140–149/90–99): Twice weekly clinic BP checks. Home BP monitoring encouraged (both arms, record readings).
• Moderate GH (150–159/100–109): Every 2–3 days or as clinically indicated. BP diary at home.
• Severe GH (≥160/110): Continuous monitoring in hospital until BP controlled.
• Automated validated devices preferred — mercury sphygmomanometers are now obsolete. Aneroid devices should be calibrated.

Urine Protein (PCR Ratio)

Protein-to-creatinine ratio (PCR) testing at each visit detects the onset of proteinuria — the key marker differentiating gestational hypertension from preeclampsia. A PCR of >30 mg/mmol (equivalent to >300 mg/24h) is diagnostic of significant proteinuria. A rising trend warrants urgent review even if below threshold. Dipstick testing alone is not sufficient for diagnosis — quantification by PCR is mandatory.

Fetal Growth Monitoring (Doppler)

Gestational hypertension impairs placental blood flow, increasing the risk of fetal growth restriction (FGR). All women with GH require:

• Serial growth scans — typically every 2–4 weeks from diagnosis
• Umbilical artery Doppler — measures resistance in the placental circulation
• Middle cerebral artery Doppler (if growth restriction suspected)
• Biophysical profile or CTG if fetal compromise is a concern
• Amniotic fluid assessment

Learn about growth scans and Doppler at Mother Hospitals →

Blood Investigations

• Full blood count (platelet count)
• Liver function tests (LFTs/AST/ALT)
• Renal function (creatinine, uric acid)
• Uric acid — elevated level associated with severity
• Repeat as clinically indicated, at least weekly in moderate-severe disease

Non-Pharmacological Management

For mild gestational hypertension (<150/100), close monitoring may be combined with lifestyle measures while considering medication:

• Rest: Avoid heavy physical exertion. Left lateral position when resting (improves uteroplacental blood flow). However, strict bed rest is not recommended — it increases the risk of blood clots.
• Diet: Balanced nutrition, adequate protein intake. Moderate sodium restriction — do not eliminate salt entirely, but avoid processed/salty foods.
• Hydration: Adequate fluid intake (2–2.5L daily unless restricted).
• Stress reduction: Avoid stressful environments where possible. Work modification may be required.
• Weight: No weight loss during pregnancy — but healthy eating supports management.

Antihypertensive Medications Safe in Pregnancy

Antihypertensive treatment is indicated when systolic BP is consistently ≥150 mmHg or diastolic ≥100 mmHg. The goal is to reduce BP to 130–150/80–100 mmHg without over-treating. Medications used:

• Labetalol (oral): First-line choice. Alpha and beta blocker. 100–200 mg twice or three times daily. Well-established safety profile in pregnancy.
• Nifedipine (modified release): Calcium channel blocker. Good evidence base. 10–20 mg twice daily initially. Avoid short-acting nifedipine capsules.
• Methyldopa: Alpha-2 agonist. Long track record in pregnancy. May cause sedation and depression — not preferred for long-term use postnatally.
• IV labetalol / IV hydralazine: Used for acute severe hypertension requiring rapid control.

⚠️ ACE inhibitors and ARBs (e.g., ramipril, losartan) are CONTRAINDICATED in pregnancy — cause fetal renal damage and must be stopped.

When Hospitalisation is Needed

Women with gestational hypertension should be admitted when:

• BP ≥160/110 mmHg on two occasions
• Symptoms suggestive of preeclampsia (headache, visual disturbances, epigastric pain)
• New proteinuria detected
• Abnormal blood investigations (platelets falling, rising creatinine/LFTs)
• Fetal growth restriction or abnormal Doppler on scan
• Inability to control BP despite oral medications
• BP not responding to second antihypertensive agent

In hospital, IV antihypertensives, CTG monitoring, and close biochemical monitoring allow safe management and timely delivery decisions.

Postpartum BP Monitoring

Blood pressure often remains elevated for several days to weeks postpartum and may even worsen in the first 48–72 hours after delivery. Women are monitored closely:

• Daily BP checks for the first 48–72 hours post-delivery
• Continue antihypertensives until BP settles — usually by 6 weeks postpartum
• If BP remains elevated at 6-week postnatal check, cardiology review is arranged
• ACE inhibitors and ARBs may now be introduced if ongoing hypertension persists (with breastfeeding advice)

Future Pregnancy & Cardiovascular Risk

• Recurrence risk: 20–40% in subsequent pregnancies. Early monitoring and aspirin prophylaxis from 12 weeks are recommended.
• Long-term CV risk: Women who had GH or preeclampsia have roughly double the lifetime risk of heart disease, stroke, and hypertension. This warrants annual BP checks and healthy lifestyle.
• Lifestyle advice: Maintain healthy weight, regular exercise, low-salt diet, non-smoking, and stress management to reduce long-term cardiovascular risk.

High-Risk Pregnancy Programme

Women with gestational hypertension are enrolled in our dedicated high-risk pregnancy pathway. This means more frequent visits, earlier escalation of concerns, and access to Dr. E. Prashanthi Reddy's specialist expertise. You are not managed as a routine antenatal patient — you receive the level of care your condition requires.