A systolic pressure of 160 mmHg or more, or a diastolic of 110 mmHg or more, confirmed on a repeat reading, is a severe-range reading in pregnancy or the postpartum period. Major obstetric guidance treats it as an emergency, with first-line agents given promptly — usually within 30 to 60 minutes of confirmation. The usual options are intravenous labetalol, intravenous hydralazine or oral immediate-release nifedipine, chosen according to local protocol and the woman's contraindications.
Delays most often happen not because of drug choice but because the repeat reading, the prescription and the administration sit with different people. Units that set a single clock from the first severe reading reduce that gap.
- Repeat a severe-range reading within 15 minutes; if it persists, treat — do not wait for laboratory results.
- Aim to give the first antihypertensive within 30 to 60 minutes of the confirmed severe reading.
- Use labetalol, hydralazine or immediate-release oral nifedipine according to your unit protocol.
- Consider magnesium sulphate for seizure prophylaxis when pre-eclampsia has severe features.
- Apply the same thresholds after birth; severe postpartum hypertension carries the same stroke risk.
Why it matters
Delay between the first severe reading and the first dose is a recurring theme in reviews of maternal stroke.
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