Cervical pessary versus vaginal progesterone in women with a singleton pregnancy, a short cervix, and no history of spontaneous preterm birth at less than 34 weeks' gestation: open label, multicentre, randomised, controlled trial
Objective To compare the effectiveness of cervical pessary and vaginal progesterone in the prevention of adverse perinatal outcomes and preterm birth in pregnant women of singletons with no prior spontaneous preterm birth at less than 34 weeks’ gestation and who have a short cervix of 35 mm or less. Design Open label, multicentre, randomised, controlled trial. Setting 20 hospitals and five obstetric ultrasound practices in the Netherlands. Participants Women with a healthy singleton pregnancy and an asymptomatic short cervix of 35 mm or less between 18 and 22 weeks’ gestation were eligible...