Study links early pregnancy factors to postpartum hypertension risk in women with gestational diabetes

Research from King’s College Hospital highlights that over a quarter of women with gestational diabetes develop hypertension within five months after childbirth, emphasising the importance of early risk identification and cardiovascular monitoring.

More than a quarter of women with gestational diabetes developed hypertension within about 5 months of giving birth, according to a study from King’s College Hospital in London that points to early pregnancy blood pressure, body weight and ethnicity as useful warning signs. The research, published in Ultrasound in Obstetrics & Gynecology, followed 678 women with gestational diabetes and found that 26.4% met the study’s definition of postpartum hypertension at a median of 5.1 months after delivery.

The strongest predictors were Black or mixed ethnicity, higher maternal weight and raised blood pressure at 12 weeks’ gestation. Women whose pregnancies were complicated by gestational hypertension or pre-eclampsia were also more likely to develop hypertension after delivery, although adding that information to a prediction model only modestly improved its accuracy. The authors said the findings support closer cardiovascular monitoring after gestational diabetes, not just screening for glucose problems.

The study also found that postpartum hypertension tended to cluster with other metabolic risks. Women in that group were more likely to have dyslipidaemia and a high waist-to-height ratio, a marker of central obesity, at follow-up. Across the full cohort, rates of dysglycaemia, abnormal adiposity, obesity, dyslipidaemia and renal dysfunction were substantial, reinforcing the view that gestational diabetes can be a marker of broader cardio-renal-metabolic risk.

Those results fit with earlier research showing that hypertensive disorders in pregnancy raise the chance of later hypertension, while other cohort studies have linked gestational diabetes with adverse lipid profiles and a higher burden of metabolic syndrome after delivery. Newer work has also suggested that central obesity in early pregnancy is tied to gestational diabetes, hypertensive disorders and later prediabetes or chronic hypertension, underscoring the importance of identifying risk early rather than waiting until after birth.