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Episiotomy
An episiotomy ( or ), also known as perineotomy, is a surgical incision of the perineum and the posterior vaginal wall generally done by a midwife or obstetrician during second stage of labor to quickly enlarge the opening for the baby to pass through. The incision, which can be done at a 90 degree angle from the vulva towards the anus or at an angle from the posterior end of the vulva (medio-lateral episiotomy), is performed under local anesthetic (pudendal anesthesia), and is sutured closed after delivery. It is one of the most common medical procedures performed on women, and although its routine use in childbirth has steadily declined in recent decades, it is still widely practiced in many parts of the world including Latin America, Poland, Bulgaria, India and Qatar.〔Chang SR, et el. "Comparison of the effects of episiotomy and no episiotomy on pain, urinary incontinence, and sexual function 3 months postpartum: A prospective follow-up study".〕
== Uses ==
Episiotomy is done as prophylaxis against soft-tissue tearing which would involve the anal sphincter and rectum. Vaginal tears can occur during childbirth, most often at the vaginal opening as the baby's head passes through, especially if the baby descends quickly. Tears can involve the perineal skin or extend to the muscles and the anal sphincter and anus. The midwife or obstetrician may decide to make a surgical cut to the perineum with scissors or a scalpel to make the baby's birth easier and prevent severe tears that can be difficult to repair. The cut is repaired with stitches (sutures). Some childbirth facilities have a policy of routine episiotomy.〔Carroli, G, Mignini, L. "Episiotomy for vaginal birth". ''Cochrane Database Syst Rev''. 2009 Jan 21; (1): CD000081.〕
Though indications on the need for episiotomy vary, and may even be controversial (see discussion below), where the technique is applied, there are two main variations. Both are depicted in the above image. In one variation, the midline episiotomy, the line of incision is central over the anus. This technique bifurcates the perineal body, which is essential for the integrity of the pelvic floor. Precipitous birth can also sever—and more severely sever—the perineal body, leading to long-term complications such as incontinence. Therefore, the oblique technique is often applied (also pictured above). In the oblique technique, the perineal body is avoided, cutting only the vagina epithelium, skin, and muscles (transversalius and bulbospongiosus). This technique aids in avoiding trauma to the perineal body by either surgical or traumatic means.
In 2009, a Cochrane meta-analysis based on studies with over 5,000 women concluded that: "Restrictive episiotomy policies appear to have a number of benefits compared to policies based on routine episiotomy. There is less posterior perineal trauma, less suturing and fewer complications, no difference for most pain measures and severe vaginal or perineal trauma, but there was an increased risk of anterior perineal trauma with restrictive episiotomy".〔 The authors were unable to find quality studies that compared mediolateral versus midline episiotomy.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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