• Fan Zhou, Xiao Dong Wang, Jing Li, Gui Qiong Huang, and Bing Xin Gao.
• Department of Obstetrics and Gynaecology, West China Second University Hospital, Sichuan University, Renmin Nan Road, Chengdu, Sichuan, China, 610041.
• Cochrane Db Syst Rev. 2014 Feb 5; 2014 (2): CD010441CD010441.

BackgroundPerineal hyaluronidase (HAase) injection was widely used to reduce the occurrence of perineal trauma, pain and need for episiotomy in the 1950s to 1960s. Reports suggested that the administration of HAase was a simple, low risk, low cost and effective way to decrease perineal trauma without adverse effects.ObjectivesThe objective of this review was to assess the effectiveness and safety of perineal HAase injection for reducing spontaneous perineal trauma, episiotomy and perineal pain in vaginal deliveries.Search MethodsWe searched the Cochrane Pregnancy and Childbirth Group's Trials Register (31 October 2013), the International Clinical Trials Registry Platform (ICTRP) and the Networked Digital Library of Theses and Dissertations (both on 1 April 2013), and reference lists of retrieved studies. We also contacted relevant organisations.Selection CriteriaPublished and unpublished randomised and quasi-randomised controlled trials comparing perineal HAase injection with placebo injection or no intervention in vaginal deliveries.Data Collection And AnalysisTwo review authors independently assessed trials for inclusion, extracted data and evaluated methodological quality. Data were checked for accuracy.Main ResultsThe search strategy identified six potentially eligible studies. Two studies were excluded. We included four randomised controlled trials that randomised a total of 599 women (data were available for 595 women).Two trials (283 women) compared the effects of perineal HAase injection during the second stage of labour with placebo injection and were at low risk of bias. Three trials (one three-armed trial was analysed twice) (373 women) compared the effects of perineal HAase injection during second stage of labour with no intervention and two out of the three trials were at high risk of bias. Data from four trials involving 599 women suggested that perineal HAase injection during second stage of labour had a lower incidence of perineal trauma (average risk ratio (RR) 0.69, 95% confidence interval (CI) 0.50 to 0.95,Tau² = 0.08, I² = 82% compared with women in the control group, but there was no clear evidence of a reduction in the incidence of episiotomy (average RR 0.74, 95% CI 0.43 to 1.29, Tau² = 0.17, I² = 66%), first and second degree perineal lacerations (average RR 0.54, 95% CI 0.38 to 1.33, Tau² = 0.30 , I² = 85%) and third and fourth degree perineal lacerations (RR 0.12, 95% CI 0.01 to 2.13). Data from two trials involving 283 women indicated that there was no clear evidence of a reduction in the incidence of perineal trauma (RR 0.90, 95% CI 0.77 to 1.06, Tau²=1.07, I² = 7%), episiotomy (RR 0.77, 95% CI 0.32 to 1.89, Tau² = 0.27, I² = 54%), first and second degree perineal lacerations (RR 1.08, 95% CI 0.83 to 1.40, Tau² = 1.11, I² = 10%) and third and fourth degree perineal lacerations (RR 0.12, 95% CI 0.01 to 2.13) with perineal HAase injection. Data from three trials involving 373 women suggested that perineal HAase injection during second stage of labour had a lower incidence of perineal trauma (RR 0.61, 95% CI 0.42 to 0.88, Tau² = 0.08, I² = 78%) compared with no intervention, but had no clear effect on in the incidence of episiotomy (RR 0.79, 95% CI 0.44 to 1.42, Tau² = 0.16, I² = 70%) and first and second degree perineal lacerations (RR 0.58, 95% CI 0.31 to 1.10, Tau² = 0.18, I² = 59%). No side effects were reported in the included trials.No included trials reported on perineal pain and other pre-specified secondary outcomes: perineal trauma requiring suturing; blood loss; dyspareunia; urinary incontinence; faecal incontinence; assisted delivery rate; women's satisfaction; Apgar score less than seven at five minutes and need for admission to special care baby unit.Authors' ConclusionsPerineal HAase injection during second stage of labour had a lower incidence of perineal trauma compared with control or no intervention, but there was no clear evidence of benefit compared with placebo injection. The difference in incidence of perineal trauma may probably be due to bias and confounding in the non-placebo controlled comparison, this result should be interpreted cautiously. The potential use of perineal HAase injection as a method to reduce perineal trauma were yet to be determined as there was no appropriate established dose for HAase, no evidence of follow up, and the number of high-quality trials and outcomes reported were too limited to draw conclusions on its effectiveness and safety. Further rigorous randomised controlled trials are required to evaluate the role of perineal HAase injection in vaginal deliveries.

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