![]() ‘A sweep may be offered to you by your midwife or obstetrician when you’re around 40 or 41 weeks pregnant, depending on whether this is a first or subsequent baby for you,' explains Netmums’ official midwife, Leah Hazard. Other primary outcomes, including the likelihood of spontaneous vaginal delivery, were not significantly different. According to the NHS, a membrane sweep will usually offered before a hormonal induction to try and kickstart labour naturally. This corresponds to an absolute risk reduction of 8.5% and a number needed to treat of 12 to prevent the need for further mechanical or pharmacologic induction of labor. For most women, labor starts within 48 hours after a membrane sweep. Every pregnancy is different and the duration between stripping of membranes (membrane sweep) and initiation of labor varies among women. Sixteen RCTs with 3,224 patients demonstrated a relative risk of 0.73 (95% CI, 0.56 to 0.94) for requiring labor induction. After stripping the membranes (membrane sweep) most women begin labor within 48 hours. Seventeen randomized controlled trials (RCTs) with 3,170 patients compared membrane sweeping with expectant management, demonstrating a relative risk of 1.21 (95% CI, 1.08 to 1.34), an absolute risk difference of 12.5%, and a number needed to treat of 8 for spontaneous onset of labor. ![]() 2 The trials compared membrane sweeping with expectant management, sham membrane sweeps, and several induction methods, including vaginal and intracervical prostaglandins and intravenous oxytocin (Pitocin). A 2020 Cochrane review included 44 studies and 6,940 patients in 19 countries (14 from the United States). A membrane sweep is also known as stripping the membranes, stretch and sweep or as the Hamilton manoeuvre in medical terminology, this is a technique used.
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