Severe pre-eclampsia at 34 weeks in a district hospital without NICU
A 32-year-old woman, G3P2, presents at 34 weeks' gestation to a district hospital three hours by road from the nearest tertiary centre. She reports frontal headache and flashing lights for 12 hours. Blood pressure is 168/112 mmHg on two readings, urine protein 3+, reflexes are brisk with two beats of clonus, and she is drowsy but rousable. Platelets are 94 x 10^9/L, ALT 118 U/L, creatinine 1.1 mg/dL, and urine output is 25 mL/hour. The hospital stocks magnesium sulfate, labetalol, hydralazine, a CTG machine and one operating theatre, but has no neonatal intensive care unit and no blood bank. A single dose of betamethasone was given four hours ago. The on-call medical officer must decide the immediate sequence of care and whether to deliver locally or transfer.
1. List, in order, the interventions you would initiate in the first 60 minutes and justify each one.
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1. Call for help and position the patient. Inform anaesthesia, paediatrics and the referral centre; nurse in the left lateral position. This reduces aortocaval compression and prepares for a possible theatre case.
2. Start magnesium sulfate immediately. A loading dose of 4 g IV over 20 minutes plus 10 g IM (5 g into each buttock), then 5 g IM every 4 hours, or 4 g IV followed by 1 g/hour infusion. This is the single intervention most likely to prevent eclampsia; the brisk reflexes and clonus indicate imminent seizure risk.
3. Lower the blood pressure, but not too fast. Give labetalol 20 mg IV, repeating with 40 mg and then 80 mg at 10-minute intervals, or hydralazine 5-10 mg IV. Aim for systolic 140-150 and diastolic 90-100 mmHg. A sudden drop can reduce placental perfusion; the purpose is to prevent maternal intracranial haemorrhage.
4. Apply continuous CTG and insert a urinary catheter. Record fetal heart rate and urine output hourly. Oliguria here most likely reflects intravascular depletion and renal vasoconstriction, not dehydration alone.
5. Restrict fluid and document intake. Keep fluids to about 80 mL/hour unless there is clear hypovolaemia. Pulmonary oedema is a common cause of death in severe pre-eclampsia, especially with a falling platelet count.
6. Send blood for grouping, cross-match, coagulation screen and repeat platelets. The platelet count of 94 x 10^9/L may fall further; know the baseline before theatre.
2. Given severe features at 34 weeks and a three-hour transfer, would you deliver locally or stabilise and refer? Defend your choice.
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The definitive treatment for severe pre-eclampsia is delivery, but the timing and place depend on what can be safely achieved. I would stabilise for 4-6 hours and then transfer, not deliver immediately, because a 34-week fetus will very likely need neonatal intensive care that this hospital cannot provide.
The stabilisation package is magnesium sulfate running, blood pressure controlled, a second dose of betamethasone if the first was more than 24 hours ago, and an escort who can give further labetalol and magnesium. The receiving unit should be told the platelet count and the CTG findings before departure.
I would abandon transfer and deliver locally if any of the following appear: non-reassuring CTG, uncontrollable hypertension despite two agents, worsening drowsiness, pulmonary oedema, suspected abruption, or a platelet count falling below 50 x 10^9/L. In that situation the maternal risk outweighs the neonatal benefit of transfer, and the theatre team can proceed with caesarean section under general anaesthesia if neuraxial block is contraindicated by the platelet count.
The judgement being tested is that severe pre-eclampsia is not automatically a 'deliver now' diagnosis at 34 weeks when the neonatal outcome would be compromised by the absence of a NICU, provided the mother can be made safe during transport.
3. How would you monitor for magnesium toxicity in a hospital without serum magnesium assays?
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Monitoring is clinical, structured, and recorded at every shift and after every dose.
- Respiratory rate: keep at or above 12-16 breaths per minute. A falling rate is a late sign; stop the infusion and give calcium gluconate 1 g IV slowly if it occurs.
- Deep tendon reflexes: the patellar reflex should remain present. Loss of reflexes precedes respiratory depression.
- Urine output: maintain at least 25-30 mL/hour (100 mL over 4 hours). Magnesium is renally excreted; with creatinine 1.1 mg/dL and oliguria, reduce the maintenance dose and consider halving it.
- Level of consciousness: increasing drowsiness beyond the expected sedative effect should prompt reassessment.
- Fetal heart rate: continuous CTG, because magnesium can cause baseline variability changes but should not cause decelerations.
Keep calcium gluconate 1 g IV drawn up at the bedside before the first magnesium dose. Document the time of each dose and the observations, because in a hospital without assays the record is the safety net. If toxicity is suspected, stop magnesium, give calcium gluconate, call for anaesthetic support, and reassess in 15 minutes.