New mothers who experienced hypertension during pregnancy can significantly cut their risk of heart attack, stroke and potentially early death by taking daily blood pressure readings at home, according to research led by the University of Oxford. The study, funded by the British Heart Foundation and supported by the NIHR Oxford Biomedical Research Centre, found that women who monitored their own blood pressure in the weeks after giving birth – and had their medication adjusted by doctors in response – ended up with healthier arteries nine months later than those who received standard NHS care.
How daily monitoring improves artery health
The core benefit lies in the way the approach tackles arterial stiffness – a condition in which the blood vessels lose their natural elasticity. Stiff arteries are less effective at expanding and contracting, which drives up blood pressure and raises the risk of blood clots forming. Those clots can block vessels and trigger heart attacks and strokes. By checking blood pressure daily and feeding the readings into a shared app, doctors were able to tailor each woman’s medication from one day to the next, ensuring her pressure stayed under control during the critical postpartum period. The result, nine months after birth, was measurably less stiff arteries among the women who used home monitoring. The Oxford team estimates that this reduction in arterial stiffness could lower the future risk of a heart attack or stroke by 10%.
The same group of researchers also published a separate study in JAMA Neurology showing that this postpartum blood-pressure optimisation was linked to larger brain white matter volumes nine months after birth – a sign of improved brain health and greater resilience to future cognitive decline.
Study design and findings
The study, reported in the journal Hypertension, recruited 220 women who had developed hypertension – either gestational hypertension or pre-eclampsia – during pregnancy. All were already on blood-pressure medication but were scheduled to have their doses reduced and eventually stopped. The women were split into two groups. The control group of 108 women received standard care: their medication was tapered based on a few blood pressure checks in the eight weeks after birth. The intervention group of 112 women used a home monitor to check their pressure every day, uploaded the results via an app that doctors could see, and had their medication adjusted day by day as needed. The daily monitoring gave far tighter control of blood pressure, and when the women were tested six to nine months later, those in the intervention group had significantly better-functioning arteries.
The hidden long-term risks of hypertensive pregnancies
Hypertensive disorders of pregnancy affect between five and ten per cent of pregnant women. They can damage the mother’s organs and endanger the baby’s life during pregnancy and birth. But the danger does not end there. Women who have had hypertension in pregnancy are three times more likely to develop chronic high blood pressure later in life and twice as likely to develop heart disease. A Harvard study found that high blood pressure in pregnancy was linked to a 42 per cent rise in the risk of premature death. The long-term consequences extend further: research shows that a history of pre-eclampsia doubles the risk of cardiovascular disease, quadruples the risk of later high blood pressure, and doubles the risk of kidney disease. Within five years of giving birth, women with hypertensive disorders face significantly elevated risks of heart failure (three- to 13-fold), stroke (two- to 17-fold), heart attack (three- to seven-fold), and coronary artery disease (two- to seven-fold), as well as a 1.4- to four-fold increase in death. Many of these adverse events can occur before middle age, with the highest risk for stroke, heart failure and ischaemic heart disease appearing one to ten years postpartum.
Expert commentary and the path ahead
Professor Paul Leeson, professor of cardiovascular medicine at the University of Oxford and a consultant cardiologist at the John Radcliffe Hospital, led the study. He described the weeks after birth as “a powerful and often overlooked opportunity” to protect women’s future heart health. “By simply monitoring blood pressure at home, new mothers with hypertensive pregnancies can protect their bodies from future damage,” he said. He expressed hope that the work would encourage wider use of home monitoring so that more women could benefit.
Dr Sonya Babu-Narayan, clinical director at the British Heart Foundation and a consultant cardiologist at Royal Brompton & Harefield hospitals, said the results highlighted a crucial window after birth when paying close attention to blood pressure could pay dividends for decades. “We now look forward to seeing results from larger studies with longer follow-up to see how this might save women’s lives,” she said. “Research like this highlights the significance of the recently renewed women’s health strategy, reflecting the importance of heart health advice and care at key points across a woman’s life, from periods and pregnancy to menopause and beyond.”
Trials are already under way to find the most effective ways of rolling out home blood pressure monitoring for women after hypertensive pregnancies. Specialist NHS clinics are one option being explored. The Health Innovation West of England is supporting the rollout of a “HOme Monitoring for Expectant (and postnatal) parents” (HOME) service across acute trusts in the region, while University College London Hospitals NHS Foundation Trust already offers a Pregnancy and Postpartum Hypertension service that includes home monitoring. The British Heart Foundation has called for cardiovascular risk factors identified during pregnancy to be incorporated into women’s health records, ensuring that the information follows them throughout their lives.