A new Cochrane review led by Dr Alice Beardmore-Gray from King’s College London, with senior authorship from Professor Cathy Cluver of Stellenbosch University, shows that planned early birth nearly halves serious complications for women with high blood pressure in pregnancy — without raising the risk of a caesarean section.
For the obstetricians who care for women with high blood pressure in pregnancy, one question comes up again and again: when is the right moment to deliver the baby? Wait too long, and a manageable situation can tip into an emergency. Act too soon, and you risk the complications of prematurity. A new review published today in Cochrane Review offers some of the clearest evidence yet, and the answer leans firmly towards not waiting.
Pooling data from six randomised controlled trials, two of which came from the CRIBS Global team, involving 3,491 women, the review found high-certainty evidence that planned early birth after 34 weeks cuts serious maternal complications by nearly half, compared with “watchful waiting.” It also likely reduces the risk of stillbirth, and, reassuringly, does not increase the chance of a caesarean section.
The work was led by Dr Alice Beardmore-Gray, obstetrician and researcher at King’s College London, with Professor Catherine Cluver of Stellenbosch University and Tygerberg Hospital as senior author. Both are familiar names within the CRIBS Global community, and the review speaks directly to the heart of our mission: finding the evidence that saves the lives of mothers and babies, in every setting.
Why this matters
Hypertensive disorders of pregnancy — which include pre-eclampsia, gestational hypertension and chronic hypertension — affect around one in ten pregnancies and are the second leading cause of maternal death worldwide. For women with pre-eclampsia, there is still only one definitive cure. Because the condition is driven by the placenta, it resolves only once the baby is born.
That makes the timing of birth not just a clinical decision but a delicate balancing act, one that clinicians weigh up every day.
“Judging when to offer birth is the question that we battle with clinically every day,” said Dr Beardmore-Gray.
What the review found
The review compared planned early birth by induction or caesarean with expectant management (close monitoring, delaying birth unless severe complications develop) for women beyond 34 weeks. The headline findings:
- Maternal complications were nearly halved. This was high-certainty evidence, the strongest grade available, meaning we can be confident in the result.
- Stillbirth was likely reduced by around 75%. This finding, based on moderate-certainty evidence, should be read with some caution: it was driven by a single trial conducted in India and Zambia, where stillbirth rates are higher. No stillbirths were recorded in the high-income country trials.
- No increase in caesarean section. Again, high-certainty evidence, a result the authors see as especially important for counselling women.
- No clear increase in admissions to the neonatal unit. Based on moderate-certainty evidence, planned early birth likely makes little to no difference here.
Crucially, the maternal benefit held across both high- and low-income settings. That suggests planned early birth reduces complications even where women are already receiving appropriate monitoring and care: a point with real significance for the low- and middle-income contexts where CRIBS Global works.
A global picture
The six trials spanned the Netherlands, the UK, the US, India and Zambia, and included women with one or more types of hypertensive disorder. The inclusion of trial data from India and Zambia is part of what gives this review its global reach and is a reminder of why evidence generated across diverse settings matters so much for mothers everywhere.
The “waiting trap”
One of the review’s most striking observations challenges a common assumption that delaying birth buys mother and baby more time.
In two of the trials, more than half the women allocated to watchful waiting ended up needing an emergency birth before 37 weeks anyway. On average, this happened just three to five days later than the women who had a planned early birth and were often in a worse condition.
“A common misconception is that by waiting longer, mum and baby are gaining more time, but often what you are doing is just delaying an inevitable emergency birth, when both may be in a worse condition,” explained Dr Beardmore-Gray.
Answering the question every woman asks
For women being counselled about an early induction, one worry tends to come first.
“That is the first question anyone asks when you offer them an early induction: won’t it increase my risk of a C-section?” said Dr Beardmore-Gray. “Being able to clearly answer no is a really important piece of information to give women when counselling them about the timing of their birth.”
The senior author, Professor Cluver, sees the findings as practical, everyday guidance.
“These findings give clinicians and women clearer guidance about the timing of birth when high blood pressure develops in pregnancy,” she said. “For women with pre-eclampsia in particular, the evidence supports offering planned early birth from 34 weeks, and no later than 37 weeks.”
What it means for care
The findings are consistent with and reinforce current international guidelines, which recommend that all women with pre-eclampsia be offered planned early birth no later than 37 weeks. Women with gestational hypertension or chronic hypertension and no severe features may choose to continue with careful monitoring, with planned early birth considered from 39 weeks onwards.
Above all, the authors stress that timing should reflect the individual woman: her preferences, the type of hypertensive disorder, and whether severe features are present.
What comes next
Safely identifying which women would benefit is a key aim of the PAPAGAIO project, where point-of-care PlGF is used to determine who should be delivered early.
Important questions remain. The authors call for more research on the longer-term outcomes of infants born late preterm, and on the long-term cardiovascular health of mothers who have experienced hypertensive disorders of pregnancy, which is an area of growing interest as we come to understand pregnancy as a window into a woman’s future health.
For now, though, the message for clinicians and women weighing up a difficult decision is clearer than it has been: when high blood pressure develops in the later stages of pregnancy, planned early birth is the safer choice.
The review, “Planned early birth versus expectant management for hypertensive disorders from 34 weeks’ gestation to term,” by Beardmore-Gray A, Rohwer C, Fernandez Turienzo C and Cluver CA, is published in the Cochrane Database of Systematic Reviews (2026, Issue 5) and summarised in PLOS Medicine.
Read the full article here.