A 28-year-old primigravida at 34 weeks of gestation presents to the antenatal clinic with a blood pressure of 158/102 mmHg. She reports a 2-week history of persistent headache, epigastric pain, and visual disturbances. On examination, she has brisk reflexes with 3+ patellar reflexes bilaterally. Urine dipstick shows 3+ proteinuria. Platelet count is 95,000/μL, serum creatinine is 1.4 mg/dL, and AST is 78 U/L. What is the most appropriate immediate management?

Question

Accepted Answer

C. Intravenous magnesium sulphate 4 g loading dose followed by 1 g/hour infusion and plan for delivery. ## Clinical Diagnosis: Severe Preeclampsia with Imminent Eclampsia This patient meets criteria for severe preeclampsia with severe features and is at high risk of eclampsia, requiring urgent intervention. ### Diagnostic Criteria Met | Feature | Value | Severity Indicator | |---------|-------|-------------------| | BP | 158/102 mmHg | ≥160/110 mmHg or ≥140/90 on 2 occasions | | Proteinuria | 3+ | ≥1+ on dipstick | | Platelets | 95,000/μL | <100,000 = severe feature | | Creatinine | 1.4 mg/dL | >1.1 = severe feature | | AST | 78 U/L | >2× ULN = severe feature | | Symptoms | Headache, epigastric pain, visual disturbances | Imminent eclampsia signs | | Reflexes | 3+ brisk | Hyperreflexia = eclampsia risk | **Key Point:** The combination of severe hypertension, thrombocytopenia, elevated transaminases, and neurological symptoms (headache, visual changes) defines **severe preeclampsia with severe features** at ≥34 weeks gestation. ### Management Algorithm for Severe Preeclampsia at ≥34 Weeks ```mermaid flowchart TD A[Severe Preeclampsia ≥34 weeks]:::outcome --> B{Maternal/fetal stability?}:::decision B -->|Stable| C[Administer MgSO4 for seizure prophylaxis]:::action B -->|Unstable/eclampsia risk| C C --> D[Initiate antihypertensive therapy]:::action D --> E[Plan delivery within 24-48 hours]:::action E --> F[Corticosteroids if <34 weeks]:::action E --> G[Delivery at ≥34 weeks]:::action G --> H[Vaginal delivery preferred if stable]:::action H --> I[Cesarean if obstetric indication]:::action ``` **High-Yield:** At ≥34 weeks with severe preeclampsia, **delivery is the definitive treatment**. Do NOT delay for expectant management. ### Why Magnesium Sulphate? 1. **Seizure prophylaxis:** Reduces eclampsia risk by ~50% (NNT = 100) 2. **Neuroprotection:** In preterm pregnancies (<32 weeks), reduces cerebral palsy risk 3. **Mechanism:** NMDA receptor antagonism, stabilizes neuromuscular junction 4. **Dosing:** 4 g IV loading over 20 min, then 1 g/hour infusion for ≥12 hours postpartum **Clinical Pearl:** Magnesium sulphate is NOT an antihypertensive—it is a seizure prophylactic. Antihypertensives (nifedipine, labetalol, hydralazine) are given concurrently for BP control. ### Antihypertensive Therapy **First-line agents in pregnancy:** - **Labetalol:** 10–20 mg IV, then 40–80 mg every 10 min (max 220 mg) - **Nifedipine (immediate-release):** 10–20 mg PO, repeat every 20–30 min - **Hydralazine:** 5–10 mg IV every 20 min (slower onset, less predictable) **Target:** Reduce MAP by 15–25% in first hour; avoid excessive reduction (risk of placental hypoperfusion). ### Delivery Plan at ≥34 Weeks - **Timing:** Delivery within 24–48 hours after stabilization - **Route:** Vaginal delivery preferred if no obstetric contraindication and maternal condition stable - **Anesthesia:** Epidural preferred (avoid general if possible—risk of aspiration, airway edema) - **Corticosteroids:** NOT indicated at ≥34 weeks (fetal lung maturity assumed) **Warning:** Do NOT use ACE inhibitors, ARBs, or atenolol in pregnancy—teratogenic or associated with fetal complications. **Mnemonic: HELLP Syndrome (subset of severe preeclampsia)** — **H**emolysis, **E**levated **L**iver enzymes, **L**ow **P**latelets. This patient has features of HELLP (thrombocytopenia, elevated AST), which mandates urgent delivery. [cite:Williams Obstetrics 26e Ch 34]

Answer

A. Oral labetalol 200 mg twice daily with expectant management until 37 weeks

Answer

B. Immediate cesarean section without antihypertensive therapy

Answer

D. Oral nifedipine 20 mg stat followed by 10 mg every 6 hours

Explanation

Clinical Diagnosis: Severe Preeclampsia with Imminent Eclampsia

Diagnostic Criteria Met

Management Algorithm for Severe Preeclampsia at ≥34 Weeks

Why Magnesium Sulphate?

Antihypertensive Therapy

Delivery Plan at ≥34 Weeks

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Feature	Value	Severity Indicator
BP	158/102 mmHg	≥160/110 mmHg or ≥140/90 on 2 occasions
Proteinuria	3+	≥1+ on dipstick
Platelets	95,000/μL	<100,000 = severe feature
Creatinine	1.4 mg/dL	>1.1 = severe feature
AST	78 U/L	>2× ULN = severe feature
Symptoms	Headache, epigastric pain, visual disturbances	Imminent eclampsia signs
Reflexes	3+ brisk	Hyperreflexia = eclampsia risk