Each antihypertensive escalation in early severe pre-eclampsia marked higher maternal risk

Design

Retrospective cohort, single level IV centre

Population

396 singleton pregnancies with pre-eclampsia with severe features managed expectantly at 23+0 to 33+5 weeks

Primary outcome

Composite serious maternal adverse outcome

Effect

+4.2 percentage points per escalation (95% CI 2.0–6.5); ≥4 escalations aRR 5.20 (1.81–14.90); daily escalation aRR 7.92 (2.90–21.63)

This retrospective cohort followed 396 women managed expectantly for pre-eclampsia with severe features at 23 to 33+5 weeks in a single US level IV centre from 2016 to 2025. It asked whether the number of oral antihypertensive dose escalations tracked serious maternal harm — abruption, fetal death, acute kidney injury, pulmonary oedema, HELLP, DIC, eclampsia, stroke or death.

It did, in a dose-response pattern. About 40% needed no escalation. Each additional escalation was associated with an absolute 4.2 percentage-point rise in the composite (95% CI 2.0 to 6.5). Three escalations carried an adjusted relative risk of 4.07 (1.41 to 11.78) and four or more 5.20 (1.81 to 14.90) compared with none; escalating daily carried 7.92 (2.90 to 21.63). Repeated IV pushes for severe-range pressures showed the same pattern. Neonatal outcomes did not differ.

The finding reframes the drug chart as a monitoring tool. A woman whose labetalol and nifedipine keep going up is telling you the disease is progressing, even when each reading is eventually brought under control. Counting escalations and IV pushes during a ward round is free and available everywhere, and it can prompt the conversation about delivery earlier.

• Count oral antihypertensive dose increases and IV pushes since admission, and record the total on each ward round.
• Treat three or more escalations, or escalation on consecutive days, as a signal to reassess the plan for delivery.
• Repeat bloods (platelets, liver enzymes, creatinine) and review for headache, visual symptoms and pulmonary oedema when escalation accelerates.
• Use the escalation count when counselling the woman and family about maternal risk during expectant management.
• Escalate early to senior review and consider transfer to a unit with neonatal intensive care if escalations are accumulating.

Why it matters

Blood pressure that is controlled only by repeated escalation is not stable disease, and the drug chart shows it before the bloods do.

Don't overread it

This is an association from one referral centre; it identifies higher-risk women but does not show that delivering on an escalation count improves outcomes.

The statistics, in plain English

The wide confidence intervals (for example 1.41 to 11.78) come from small numbers in the highest-escalation groups — only 55 women had three or more. The direction and the step-by-step rise are consistent; the exact size of the risk is uncertain. Escalation partly reflects how sick the woman already was, so it is a marker, not a cause.

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