Severe preeclampsia at 34 weeks with a non-reassuring fetal tracing
A 32-year-old woman, G2P1, at 34+3 weeks' gestation attends the antenatal clinic with a 2-day history of frontal headache and visual flashes. BP is 172/114 mmHg on two readings 15 minutes apart; urine dipstick 3+ protein. She has brisk reflexes and 1+ ankle edema. Labs: platelets 92 × 10⁹/L, AST 118 U/L, ALT 96 U/L, creatinine 97 µmol/L, uric acid 420 µmol/L, hemoglobin 108 g/L. Fetal heart tracing shows a baseline of 150 bpm, minimal variability, and one deceleration; no contractions on toco. Cervix is 1 cm dilated, 30% effaced, station -2. Ultrasound shows a normally grown fetus with normal amniotic fluid. The unit has magnesium sulfate, IV labetalol and hydralazine, and neonatal special care, but no adult intensive care; the tertiary center is 90 minutes away. The consultant is in theatre and will be available in 30 minutes.
1. What are your immediate maternal priorities in the first hour, including drug choices and monitoring?
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Stabilize the mother before focusing on delivery.
- Left lateral position, IV access, continuous maternal ECG, BP every 10–15 minutes, and continuous fetal monitoring.
- Start magnesium sulfate for seizure prophylaxis: 4 g IV loading over 20 minutes, then 1 g/hour maintenance. Monitor deep tendon reflexes, respiratory rate, urine output and, where available, magnesium levels. Have calcium gluconate at the bedside for toxicity.
- Treat severe hypertension: labetalol 20 mg IV, repeated every 10 minutes up to 80 mg, or hydralazine 5–10 mg IV, or oral nifedipine 10 mg. Aim for 140–150/90–100 mmHg; avoid a sudden fall that could impair uteroplacental perfusion. Do not use ACE inhibitors or ARBs.
- Send CBC, platelets, LDH, haptoglobin, bilirubin, AST/ALT, creatinine, uric acid, coagulation screen, blood group and crossmatch. The low platelets and raised liver enzymes suggest severe preeclampsia with possible HELLP; check for hemolysis.
- Insert a Foley catheter and monitor hourly urine output. Use maintenance fluids rather than large boluses, because she is at risk of pulmonary edema.
- Inform the consultant, anaesthetist and neonatal team. The tertiary center may be needed if adult intensive care is required.
Reasoning: Eclampsia and intracerebral hemorrhage are the immediate threats. Magnesium prevents seizures, antihypertensives lower the risk of stroke, and delivery is the definitive treatment once the mother is stable.
2. At 34+3 weeks with severe features and a category II tracing, how do you decide timing and mode of delivery? Would you give corticosteroids?
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Delivery is indicated after maternal stabilization because she has severe preeclampsia at ≥34 weeks.
- Do not delay delivery for a corticosteroid course. At 34+3 weeks, antenatal corticosteroids may be considered if preterm delivery is anticipated and she has not received them, but they should not postpone delivery when there is severe maternal disease or a non-reassuring fetal tracing. The priority is maternal safety and fetal status.
- The category II tracing with minimal variability and a deceleration is concerning. After magnesium and BP control, reassess the tracing. If it remains non-reassuring, proceed to cesarean delivery. If it normalizes and the mother is stable, induction of labour could be considered, but the cervix is only 1 cm and the fetus is already showing signs of compromise, so the threshold for cesarean should be low.
- Severe preeclampsia itself is not an absolute indication for cesarean. Vaginal delivery is preferred when the cervix is favorable and the fetus is stable, because it avoids abdominal surgery. Here the cervix is unfavorable and the tracing is abnormal, so cesarean is likely.
- Involve the consultant, anaesthetist and neonatologist. Prepare for possible neonatal resuscitation and ensure blood products are available given the thrombocytopenia.
Reasoning: At ≥34 weeks, the risk of continuing severe preeclampsia outweighs the benefit of expectant management. The mode of delivery is determined by fetal status, cervical favourability and the urgency of delivery, not by the diagnosis alone.
3. What postpartum monitoring and counseling would you arrange?
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Postpartum care focuses on preventing eclampsia, controlling BP and recognizing delayed complications.
- Continue magnesium sulfate for 24 hours after delivery or 24 hours after the last seizure, whichever is later. Monitor reflexes, respiratory rate, urine output and magnesium levels. Stop if toxicity develops and give calcium gluconate.
- Monitor BP closely for at least 24–48 hours, then at 1 week and 6 weeks. Severe hypertension can persist or worsen postpartum; treat with labetalol, nifedipine or methyldopa according to breastfeeding status and local policy. Avoid ACE inhibitors while breastfeeding unless specialist advice supports use.
- Check platelets, liver enzymes and creatinine postpartum if they were abnormal. Watch for HELLP syndrome, pulmonary edema, renal failure and thromboembolism. Use VTE prophylaxis according to risk.
- Counsel her that preeclampsia can recur in 15–20% of future pregnancies and that she has increased long-term cardiovascular risk. Advise weight management, BP follow-up, and prepregnancy counseling. In a future pregnancy, low-dose aspirin should be started from 12 weeks if she is at high risk.
- Discuss contraception and interpregnancy interval, and ensure neonatal follow-up.
Reasoning: Eclampsia can occur up to 6 weeks postpartum, and cardiovascular risk persists for life. Discharge without a BP and recurrence plan misses the most important long-term opportunity.