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American Journal of Obstetrics and... Mar 2024Perineal trauma after vaginal birth is common, with approximately 9 of 10 women being affected. Second-degree perineal tears are twice as likely to occur in primiparous... (Review)
Review
Perineal trauma after vaginal birth is common, with approximately 9 of 10 women being affected. Second-degree perineal tears are twice as likely to occur in primiparous births, with a incidence of 40%. The incidence of obstetrical anal sphincter injury is approximately 3%, with a significantly higher rate in primiparous than in multiparous women (6% vs 2%). Obstetrical anal sphincter injury is a significant risk factor for the development of anal incontinence, with approximately 10% of women developing symptoms within a year following vaginal birth. Obstetrical anal sphincter injuries have significant medicolegal implications and contribute greatly to healthcare costs. For example, in 2013 and 2014, the economic burden of obstetrical anal sphincter injuries in the United Kingdom ranged between £3.7 million (with assisted vaginal birth) and £9.8 million (with spontaneous vaginal birth). In the United States, complications associated with trauma to the perineum incurred costs of approximately $83 million between 2007 and 2011. It is therefore crucial to focus on improvements in clinical care to reduce this risk and minimize the development of perineal trauma, particularly obstetrical anal sphincter injuries. Identification of risk factors allows modification of obstetrical practice with the aim of reducing the rate of perineal trauma and its attendant associated morbidity. Risk factors associated with second-degree perineal trauma include increased fetal birthweight, operative vaginal birth, prolonged second stage of labor, maternal birth position, and advanced maternal age. With obstetrical anal sphincter injury, risk factors include induction of labor, augmentation of labor, epidural, increased fetal birthweight, fetal malposition (occiput posterior), midline episiotomy, operative vaginal birth, Asian ethnicity, and primiparity. Obstetrical practice can be modified both antenatally and intrapartum. The evidence suggests that in the antenatal period, perineal massage can be commenced in the third trimester of pregnancy to increase muscle elasticity and allow stretching of the perineum during birth, thereby reducing the risk of tearing or need for episiotomy. With regard to the intrapartum period, there is a growing body of evidence from the United Kingdom, Norway, and Denmark suggesting that the implementation of quality improvement initiatives including the training of clinicians in manual perineal protection and mediolateral episiotomy can reduce the incidence of obstetrical anal sphincter injury. With episiotomy, the International Federation of Gynecology and Obstetrics recommends restrictive rather than routine use of episiotomy. This is particularly the case with unassisted vaginal births. However, there is a role for episiotomy, specifically mediolateral or lateral, with assisted vaginal births. This is specifically the case with nulliparous vacuum and forceps births, given that the use of mediolateral or lateral episiotomy has been shown to significantly reduce the incidence of obstetrical anal sphincter injury in these groups by 43% and 68%, respectively. However, the complications associated with episiotomy including perineal pain, dyspareunia, and sexual dysfunction should be acknowledged. Despite considerable research, interventions for reducing the risk of perineal trauma remain a subject of controversy. In this review article, we present the available data on the prevention of perineal trauma by describing the risk factors associated with perineal trauma and interventions that can be implemented to prevent perineal trauma, in particular obstetrical anal sphincter injury.
Topics: Pregnancy; Female; Humans; Birth Weight; Episiotomy; Parity; Parturition; Lacerations; Anal Canal; Risk Factors; Perineum; Obstetric Labor Complications
PubMed: 37635056
DOI: 10.1016/j.ajog.2022.06.021 -
Anatomical Science International Jul 2023The purpose of this review is to present our researches on the pelvic outlet muscles, including the pelvic floor and perineal muscles, which are responsible for urinary... (Review)
Review
The purpose of this review is to present our researches on the pelvic outlet muscles, including the pelvic floor and perineal muscles, which are responsible for urinary function, defecation, sexual function, and core stability, and to discuss the insights into the mechanism of pelvic floor stabilization based on the findings. Our studies are conducted using a combination of macroscopic examination, immunohistological analysis, 3D reconstruction, and imaging. Unlike most previous reports, this article describes not only on skeletal muscle but also on smooth muscle structures in the pelvic floor and perineum to encourage new understanding. The skeletal muscles of the pelvic outlet are continuous, which means that they share muscle bundles. They form three muscle slings that pass anterior and posterior to the anal canal, thus serving as the foundation of pelvic floor support. The smooth muscle of the pelvic outlet, in addition to forming the walls of the viscera, also extends in three dimensions. This continuous smooth muscle occupies the central region of the pelvic floor and perineum, thus revising the conventional understanding of the perineal body. At the interface between the levator ani and pelvic viscera, smooth muscle forms characteristic structures that transfer the lifting power of the levator ani to the pelvic viscera. The findings suggest new concepts of pelvic floor stabilization mechanisms, such as dynamic coordination between skeletal and smooth muscles. These two types of muscles possibly coordinate the direction and force of muscle contraction with each other.
Topics: Pelvic Floor; Perineum; Muscle, Skeletal; Muscle, Smooth; Anal Canal
PubMed: 36961619
DOI: 10.1007/s12565-023-00717-7 -
Midwifery Sep 2023The aim of this study is to evaluate the effect of perineal massage and warm compresses technique on the perineum integrity during second stage of labor. (Randomized Controlled Trial)
Randomized Controlled Trial
OBJECTIVE
The aim of this study is to evaluate the effect of perineal massage and warm compresses technique on the perineum integrity during second stage of labor.
DESIGN AND SETTING
A single-center, prospective, randomized controlled trial was conducted between March 1st, 2019, and December 31st, 2020, at Hospital of Braga.
PARTICIPANTS
Women with 18 years or older, between 37 weeks and 41 weeks pregnant, in whom a vaginal birth of a fetus in the cephalic presentation was planned were recruited. Eight hundred forty-eight women were randomly assigned (Perineal massage and warm compresses group, n = 424 and control group, n = 424), and 800 women, both perineal massage and warm compresses group (n = 400) and control group (n = 400) were included in the strict per protocol analysis.
INTERVENTION
In the perineal massage and warm compresses group, women received perineal massage and warm compresses and in the control group, women received hands-on technique.
RESULTS
The incidence of intact perineum was significantly higher in the perineal massage and warm compresses group [perineal massage and warm compresses group: 47% vs control group: 26.3%; OR 2.53, 95% CI 1.86-3.45, p<0.001], whereas second-degree tears and episiotomy rate were significantly lower in this group [perineal massage and warm compresses group: 7.2% vs control group: 12.3%; OR 1.96, 95% CI 1.17-3.29, p = 0.010 and perineal massage and warm compresses group: 9.5% vs control group: 28.5%; OR 3.478, 95% CI 2.236-5.409, p<0.001, respectively]. Also, obstetric anal sphincter injury with and without episiotomy and second-degree tears with episiotomy were significantly lower in the perineal massage and warm compresses group [perineal massage and warm compresses group: 0.5% vs control group: 2.3%; OR 5.404, 95% CI 1.077-27.126, p = 0.040 and perineal massage and warm compresses group: 0.3% vs control group: 1.8%; OR 9.253, 95% CI 1.083-79.015, p = 0.042, respectively].
CONCLUSIONS
The perineal massage and warm compresses technique increased the incidence of intact perineum and reduced the incidence of second-degree tear, episiotomy and obstetric anal sphincter injury.
IMPLICATIONS FOR PRACTICE
Perineal massage and warm compresses technique is feasible, inexpensive and reproductible. Therefore, this technique should be taught and trained to midwives students and midwives team. Thus, women should have this information and have the option to decide whether they want to receive the perineal massage and warm compresses technique in the second stage of labor.
Topics: Pregnancy; Female; Humans; Perineum; Prospective Studies; Obstetric Labor Complications; Episiotomy; Massage
PubMed: 37385009
DOI: 10.1016/j.midw.2023.103763