Severe preeclampsia with early-onset fetal growth restriction at 29 weeks
Rana, 31, gravida 2 para 1, is admitted at 29+4 weeks with a two-day history of frontal headache and visual shimmering. Blood pressure is 168/112 mmHg, and 172/110 mmHg twenty minutes later; dipstick proteinuria is 3+. She is hyperreflexic with two beats of clonus. Platelets 96 × 10⁹/L, ALT 118 U/L, creatinine 96 micromol/L, uric acid 0.42 mmol/L, urine output 25 mL/hour over the last 4 hours. Ultrasound shows a single fetus with estimated weight 780 g (below the 3rd centile), maximal vertical pocket 1.8 cm, absent end-diastolic flow in the umbilical artery and a normal ductus venosus. CTG: baseline 150 beats/min, reduced variability, no decelerations. The unit stocks magnesium sulfate and has a level-3 neonatal unit with four available cots, but no maternal intensive care; the nearest tertiary obstetric ICU is 3 hours away.
1. State the diagnosis and classification, then write the immediate management with doses and monitoring.
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Diagnosis: severe preeclampsia with severe features at 29+4 weeks (blood pressure ≥160/110, headache, visual symptoms, hyperreflexia, oliguria, renal impairment, proteinuria), with partial HELLP (platelets 96, ALT more than twice normal - send LDH and blood film for haemolysis), plus severe early-onset fetal growth restriction with absent end-diastolic umbilical flow.
Immediate management:
- Admit to the highest-dependency area available; hourly blood pressure, strict fluid balance, 4-hourly urine output, reflexes and respiratory rate, continuous or 4-hourly CTG.
- Magnesium sulfate 4 g IV over 20 minutes then 1 g/hour (or 1–2 g/hour) - also neuroprotective for the fetus below 32 weeks. Stop or reduce if respiratory rate <12, reflexes absent or urine output <25 mL/hour; keep 10% calcium gluconate 10 mL at the bedside.
- Antihypertensives to a target of about 130–150/80–100 mmHg: labetalol 20 mg IV then 40–80 mg every 10 minutes, or hydralazine 5 mg IV every 20 minutes, or oral nifedipine 10 mg. Do not drop the pressure abruptly - uteroplacental perfusion is already compromised. Never give ACE inhibitors or diuretics except for pulmonary oedema.
- Betamethasone 12 mg IM, two doses 24 hours apart.
- Restrict fluids to roughly 80 mL/hour; 12-hourly full blood count, film, LDH, ALT, creatinine, uric acid, coagulation.
- Document a plan for eclampsia, abruption and pulmonary oedema, and discuss transfer with the tertiary unit now rather than during a crisis.
2. How would you decide the timing and mode of delivery, and what findings would make you deliver immediately rather than wait for the steroid window?
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Timing is a balance between a 780 g fetus and a mother with progressive disease. Delivery is inevitable; the only question is whether 24–48 hours of steroids can be bought safely.
Deliver now, without waiting for steroids, if: blood pressure remains ≥160/110 despite two agents; platelets are falling or below 100 with rising LDH/ALT; there is abruption, pulmonary oedema, eclampsia, creatinine rising, oliguria unresponsive to fluids; or the CTG becomes non-reassuring. Reduced variability with absent end-diastolic flow already signals a fetus that will not tolerate a long wait, and fetal death in utero in a severely growth-restricted fetus is a real risk.
If stabilised - blood pressure controlled, platelets stable, urine output maintained, CTG unchanged - it is reasonable to give the steroid course over 24–48 hours in a unit with level-3 neonatal care, with continuous monitoring and a low threshold to abandon the wait. Do not transfer her 3 hours down the road in this state; transfer should be neonatal-led or after delivery.
Mode: caesarean section, because the cervix is unfavourable and an expedited delivery is likely to be needed. Use a lower-segment approach, left lateral tilt, fluid preload for the inevitable spinal hypotension, and avoid ergometrine. Regional anaesthesia is acceptable if platelets are above about 75 × 10⁹/L with no coagulopathy; below that, or if platelet count is falling rapidly, plan general anaesthesia. Have the neonatal team present, continue magnesium for 24 hours postpartum, and anticipate postpartum haemorrhage from a uterus already sensitised to oxytocin and magnesium.
3. Counsel the couple about the baby's likely outcome and about the mother's future pregnancy and long-term health.
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Neonatal counselling must be honest and specific, and the neonatal team should speak to the parents antenatally.
At 29 weeks with a birthweight of 780 g in a level-3 unit, survival is roughly 60–70% in well-resourced settings, but this fetus is growth-restricted with absent end-diastolic flow on top of maternal disease, so mortality and morbidity are higher than for a normally grown 29-week infant. Quote the unit's own figures if available. The main morbidities are respiratory distress and bronchopulmonary dysplasia, necrotising enterocolitis, severe intraventricular haemorrhage, retinopathy of prematurity, late sepsis and neurodevelopmental impairment including cerebral palsy in roughly 5–15% of survivors - outcome is driven more by gestation than by growth. Expect weeks of neonatal care and the possibility of transfer to another unit if cots are limited.
For the mother:
- Preeclampsia resolves after delivery, but hypertension may persist; arrange follow-up and renal/proteinuria review at 6–12 weeks.
- Recurrence risk after early-onset severe preeclampsia is around 20–30%, higher if she has antiphospholipid syndrome or chronic hypertension - screen accordingly.
- In the next pregnancy: aspirin 75–150 mg from 12 weeks, calcium supplementation, early booking, serial growth scans and uterine artery Doppler.
- She has a lifelong raised cardiovascular risk; counsel on weight, smoking, blood pressure and later cardiovascular review. Avoid combined hormonal contraception until blood pressure is controlled.