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Induction of labour at 41 weeks versus expectant management and induction of labour at 42 weeks (SWEdish Post-term Induction Study, SWEPIS): multicentre, open label, randomised, superiority trial

Artikel i vetenskaplig tidskrift
Författare Ulla-Britt Wennerholm
Sissel Saltvedt
Anna Wessberg
Mårten Alkmark
Christina Bergh
Sophia Brismar Wendel
Helena Fadl
Maria Jonsson
Lars Ladfors
Verena Sengpiel
Jan Wesström
Göran Wennergren
Anna-Karin Wikström
Helen Elden
Olof Stephansson
Henrik Hagberg
Publicerad i BMJ
Volym 367
ISSN 0959-8138
Publiceringsår 2019
Publicerad vid Institutionen för vårdvetenskap och hälsa
Institutionen för kliniska vetenskaper, Avdelningen för pediatrik
Institutionen för kliniska vetenskaper, Avdelningen för obstetrik och gynekologi
Språk en
Länkar dx.doi.org/10.1136/bmj.l6131
Ämneskategorier Reproduktionsmedicin och gynekologi

Sammanfattning

Objective To evaluate if induction of labour at 41 weeks improves perinatal and maternal outcomes in women with a low risk pregnancy compared with expectant management and induction of labour at 42 weeks.Design Multicentre, open label, randomised controlled superiority trial.Setting 14 hospitals in Sweden, 2016-18.Participants 2760 women with a low risk uncomplicated singleton pregnancy randomised (1:1) by the Swedish Pregnancy Register. 1381 women were assigned to the induction group and 1379 were assigned to the expectant management group.Interventions Induction of labour at 41 weeks and expectant management and induction of labour at 42 weeks.Main outcome measures The primary outcome was a composite perinatal outcome including one or more of stillbirth, neonatal mortality, Apgar score less than 7 at five minutes, pH less than 7.00 or metabolic acidosis (pH <7.05 and base deficit >12 mmol/L) in the umbilical artery, hypoxic ischaemic encephalopathy, intracranial haemorrhage, convulsions, meconium aspiration syndrome, mechanical ventilation within 72 hours, or obstetric brachial plexus injury. Primary analysis was by intention to treat.Results The study was stopped early owing to a significantly higher rate of perinatal mortality in the expectant management group. The composite primary perinatal outcome did not differ between the groups: 2.4% (33/1381) in the induction group and 2.2% (31/1379) in the expectant management group (relative risk 1.06, 95% confidence interval 0.65 to 1.73; P=0.90). No perinatal deaths occurred in the induction group but six (five stillbirths and one early neonatal death) occurred in the expectant management group (P=0.03). The proportion of caesarean delivery, instrumental vaginal delivery, or any major maternal morbidity did not differ between the groups.Conclusions This study comparing induction of labour at 41 weeks with expectant management and induction at 42 weeks does not show any significant difference in the primary composite adverse perinatal outcome. However, a reduction of the secondary outcome perinatal mortality is observed without increasing adverse maternal outcomes. Although these results should be interpreted cautiously, induction of labour ought to be offered to women no later than at 41 weeks and could be one (of few) interventions that reduces the rate of stillbirths.Trial registration Current Controlled Trials ISRCTN26113652.

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