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Koopmans, Corine M, Dr; Bijlenga, Denise, MSc; Groen, Henk, MD; Vijgen, Sylvia MC, MSc; Aarnoudse, Jan G, Prof; Bekedam, Dick J, MD; van den Berg, Paul P, Prof; de Boer, Karin, MD; Burggraaff, Jan M, MD; Bloemenkamp, Kitty WM, MD; Drogtrop, Addy P, MD; Franx, Arie, MD; de Groot, Christianne JM, MD; Huisjes, Anjoke JM, MD; Kwee, Anneke, MD; van Loon, Aren J, MD; Lub, Annemiek, MD; Papatsonis, Dimitri NM, MD; van der Post, Joris AM, Prof; Roumen, Frans JME, MD; Scheepers, Hubertina CJ, MD; Willekes, Christine, MD; Mol, Ben WJ, Prof; van Pampus, Maria G, MD
The Lancet (British edition), 09/2009, Volume: 374, Issue: 9694Journal Article
Summary Background Robust evidence to direct management of pregnant women with mild hypertensive disease at term is scarce. We investigated whether induction of labour in women with a singleton pregnancy complicated by gestational hypertension or mild pre-eclampsia reduces severe maternal morbidity. Methods We undertook a multicentre, parallel, open-label randomised controlled trial in six academic and 32 non-academic hospitals in the Netherlands between October, 2005, and March, 2008. We enrolled patients with a singleton pregnancy at 36–41 weeks' gestation, and who had gestational hypertension or mild pre-eclampsia. Participants were randomly allocated in a 1:1 ratio by block randomisation with a web-based application system to receive either induction of labour or expectant monitoring. Masking of intervention allocation was not possible. The primary outcome was a composite measure of poor maternal outcome—maternal mortality, maternal morbidity (eclampsia, HELLP syndrome, pulmonary oedema, thromboembolic disease, and placental abruption), progression to severe hypertension or proteinuria, and major post-partum haemorrhage (>1000 mL blood loss). Analysis was by intention to treat and treatment effect is presented as relative risk. This study is registered, number ISRCTN08132825. Findings 756 patients were allocated to receive induction of labour (n=377 patients) or expectant monitoring (n=379). 397 patients refused randomisation but authorised use of their medical records. Of women who were randomised, 117 (31%) allocated to induction of labour developed poor maternal outcome compared with 166 (44%) allocated to expectant monitoring (relative risk 0·71, 95% CI 0·59–0·86, p<0·0001). No cases of maternal or neonatal death or eclampsia were recorded. Interpretation Induction of labour is associated with improved maternal outcome and should be advised for women with mild hypertensive disease beyond 37 weeks' gestation. Funding ZonMw.
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