LAUSR

AIM AND OBJECTIVE To summarize the evidence on the effects of different techniques during the second stage of labour on reducing perineal laceration depending on available systematic reviews to provide optimal evidence for decision-making. BACKGROUND Preventing perineal laceration has been considered an important part of improving women's health. Various techniques have been used to prevent perineal laceration during the second stage of labour. However, systematic reviews evaluating the effects of different techniques on reducing perineal laceration show inconsistent results. DESIGN Overview of systematic reviews. METHODS Five English and four Chinese databases were systematically searched for relevant systematic reviews and meta-analyses published between 1 January 2016 and 31 August 2021. The quality of the included reviews was assessed by the AMSTAR 2 tool. A narrative synthesis was conducted to report the results of moderate-to-high quality systematic reviews. The overview was reported according to the PRISMA statement. RESULTS Eighteen reviews were included, of which four reviews had moderate-to-high methodological quality. Perineal massage and warm compresses significantly decreased the incidence of third- or fourth-degree perineal laceration (moderate-quality evidence). Hands-off technique had no impact on perineal laceration (low-to-moderate quality evidence). Ritgen's manoeuvre could reduce the incidence of first-degree perineal laceration but increase the incidence of second-degree perineal laceration (very low-quality evidence). Spontaneous pushing (low-quality evidence) and delayed pushing (moderate-quality evidence) had no impact on the incidence of third- or fourth-degree perineal laceration. Upright positions did not increase the risk of third- or fourth-degree perineal laceration (very low- to low-quality evidence) but increased the risk of second-degree perineal laceration for women without epidural analgesia (low-quality evidence). CONCLUSIONS Perineal massage and warm compresses could be the better choice for preventing perineal laceration in the second stage of labour. RELEVANCE TO CLINICAL PRACTICE Midwives and obstetricians could use perineal massage and warm compresses to prevent perineal laceration and should consider women's preferences and experience with perineal techniques.