A 32-year-old multiparous woman at 30 weeks of gestation is referred from the primary health center with a blood pressure of 152/98 mmHg recorded on two occasions 4 hours apart. She denies headache, visual disturbances, or epigastric pain. Physical examination is unremarkable except for elevated BP. Urine dipstick shows trace proteinuria (<1+). Platelet count is 210,000/μL, serum creatinine is 0.9 mg/dL, and liver enzymes are normal. Fetal heart rate is 140 bpm with reactive NST. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis: Gestational Hypertension (Preeclampsia Without Severe Features) This patient meets criteria for preeclampsia (hypertension + proteinuria) but lacks severe features, allowing for outpatient management with close monitoring at 30 weeks gestation. ### Diagnostic Classification | Criterion | This Patient | Severe Preeclampsia? | |-----------|--------------|---------------------| | BP | 152/98 mmHg (≥140/90 on 2 occasions) | No (requires ≥160/110) | | Proteinuria | Trace (<1+) | No (requires ≥1+) | | Platelets | 210,000/μL | No (requires <100,000) | | Creatinine | 0.9 mg/dL | No (requires >1.1) | | Liver enzymes | Normal | No (requires >2× ULN) | | Symptoms | None (no headache, visual changes, epigastric pain) | No severe features | | Fetal status | Reactive NST, HR 140 | Reassuring | **Key Point:** This is **preeclampsia without severe features** (formerly called "preeclampsia without severe range BP"). Expectant management with intensive outpatient monitoring is appropriate at 30 weeks. ### Management Algorithm for Preeclampsia Without Severe Features at <34 Weeks ```mermaid flowchart TD A[Preeclampsia without severe features<br/>Gestation <34 weeks]:::outcome --> B{Maternal/fetal stability?}:::decision B -->|Yes| C[Initiate oral antihypertensive]:::action C --> D[Twice-weekly antenatal visits]:::action D --> E[Weekly labs: CBC, LFTs, Cr]:::action E --> F[Twice-weekly NST]:::action F --> G{Progression to severe features?}:::decision G -->|No| H[Continue expectant management<br/>until 37 weeks or labor]:::action G -->|Yes| I[Admit, MgSO4, deliver<br/>within 24-48 hrs]:::urgent B -->|No| I ``` **High-Yield:** At <34 weeks with preeclampsia WITHOUT severe features, **expectant management with close outpatient monitoring is standard**. Delivery is NOT indicated unless severe features develop or fetal compromise occurs. ### Antihypertensive Therapy in Preeclampsia **Indications for treatment:** - Sustained BP ≥160/110 mmHg (severe range) → treat immediately - Sustained BP ≥140/90 mmHg with proteinuria (preeclampsia) → treat to prevent progression - Target: Maintain BP 140–150 systolic, 90–100 diastolic (avoid excessive lowering → placental hypoperfusion) **First-line oral agents:** | Agent | Dosing | Onset | Notes | |-------|--------|-------|-------| | **Labetalol** | 200 mg BD, titrate to 400 mg BD | 2–4 hours | Preferred in pregnancy; α + β blocker | | **Nifedipine (ER)** | 10–20 mg BD, titrate to 40 mg BD | 30 min–2 hours | Dihydropyridine; safe in pregnancy | | **Methyldopa** | 250 mg BD–TID | 4–6 hours | Slower onset; less commonly used now | **Avoid:** ACE inhibitors, ARBs, atenolol (teratogenic or adverse fetal effects). ### Monitoring Schedule for Preeclampsia Without Severe Features 1. **Antenatal visits:** Twice weekly (BP, symptoms, weight, urine protein) 2. **Laboratory tests:** Weekly CBC, liver enzymes, serum creatinine 3. **Fetal assessment:** Twice-weekly NST; ultrasound for growth if indicated 4. **Patient education:** Red-flag symptoms (headache, visual changes, epigastric pain, decreased fetal movement) **Clinical Pearl:** Preeclampsia can progress rapidly. Any development of severe features (BP ≥160/110, thrombocytopenia, elevated transaminases, neurological symptoms, pulmonary edema) mandates immediate hospitalization, magnesium sulphate, and delivery within 24–48 hours. ### Why NOT Magnesium Sulphate Now? - Magnesium sulphate is **seizure prophylaxis** for severe preeclampsia or eclampsia, not for mild-to-moderate disease - This patient has no severe features and is at low eclampsia risk - Routine use in preeclampsia without severe features increases maternal adverse effects without benefit ### Why NOT Corticosteroids or Delivery Now? - **Corticosteroids:** Indicated only if delivery is anticipated within 7 days (e.g., severe preeclampsia at 30 weeks planned for delivery). Not indicated for expectant management. - **Delivery:** Indicated at ≥37 weeks (or earlier if severe features develop). At 30 weeks with stable disease, benefits of in-utero maturation outweigh risks of prematurity. **Mnemonic: HELLP = Severe Preeclampsia Subset** — This patient does NOT have HELLP (normal platelets, normal LFTs), so expectant management is safe. **Warning:** Do NOT confuse gestational hypertension (elevated BP without proteinuria) with preeclampsia (elevated BP + proteinuria). This patient has proteinuria (trace), so the diagnosis is preeclampsia, not gestational hypertension alone. [cite:Williams Obstetrics 26e Ch 34; ACOG Practice Bulletin 202]