Chronic or gestational hypertension complicates 7% of pregnancies, half of which will reach 37 weeks' gestation. Observational data suggest that early term birth (at 37 to 38 weeks) may reduce maternal complications (e.g., preeclampsia), Caesareans, stillbirth and costs of maternal fetal surveillance; however, early term birth may increase neonatal morbidity. There are no high-quality data on which to base timing of birth for this high-risk population.

The WILL trial (When to Induce Labour to Limit risk in pregnancy hypertension) aimed to address the optimal timing of birth for women with chronic or gestational hypertension at term gestational age, when women remain well and there is no evidence of pre-eclampsia. WILL was a multicentre randomised trial of 403 women with chronic or gestati

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