Perineal tear

A perineal tear is a laceration of the skin and other soft tissue structures which, in women, separate the vagina from the anus. Perineal tears mainly occur in women as a result of vaginal childbirth, which strains the perineum. It is the most common form of obstetric injury.[1] Tears vary widely in severity. The majority are superficial and may require no treatment, but severe tears can cause significant bleeding, long-term pain or dysfunction. A perineal tear is distinct from an episiotomy, in which the perineum is intentionally incised to facilitate delivery. Episiotomy, a very rapid birth, or large fetal size can lead to more severe tears which may require surgical intervention.

Perineal tear
Other namesLatin: Laceratio perinei
Illustration of two perineal tears.
SpecialtyObstetrics

Anatomy

In women, an anatomical area known as the perineum separates the opening of the vagina from that of the anus. Each opening is surrounded by a wall, and the anal wall is separated from the vaginal wall by a mass of soft tissue including:

A perineal tear may involve some or all of these structures, which normally aid in supporting the pelvic organs and maintaining faecal continence.[3]

Classification

Tears are classified into four categories:[4][5]

  • First-degree tear: laceration is limited to the fourchette and superficial perineal skin or vaginal mucosa
  • Second-degree tear: laceration extends beyond fourchette, perineal skin and vaginal mucosa to perineal muscles and fascia, but not the anal sphincter
  • Third-degree tear: fourchette, perineal skin, vaginal mucosa, muscles, and anal sphincter are torn; third-degree tears may be further subdivided into three subcategories:[6]
    • 3a: partial tear of the external anal sphincter involving less than 50% thickness
    • 3b: greater than 50% tear of the external anal sphincter
    • 3c: internal sphincter is torn
  • Fourth-degree tear: fourchette, perineal skin, vaginal mucosa, muscles, anal sphincter, and rectal mucosa are torn
  • Button-hole tear: the tear involves rectal mucosa with an intact anal sphincter complex

Cause

In humans and some other primates, the head of the term fetus is so large in comparison to the size of the birth canal that delivery may result in some degree of trauma.[7] As the head passes through the pelvis, the soft tissues are stretched and compressed. The risk of severe tear is greatly increased if the fetal head is oriented occiput posterior (face forward), if the mother has not given birth before or if the fetus is large.[8]

A surgical incision on the perineum skin called an episiotomy was historically used routinely in order to reduce perineal tears.[9] However, its routine use has declined as there is some evidence it increases the severity of tears when it is not indicated.[10] A Cochrane review found that routine use of epsiotomy increased the incidence of severe perineal tears by 30%.[11]

Several other techniques are used to reduce the risk of tearing, but with little evidence for efficacy. Antenatal digital perineal massage is often advocated, and may reduce the risk of trauma only in nulliparous women.[12] ‘Hands on’ techniques employed by midwives, in which the foetal head is guided through the vagina at a controlled rate have been widely advocated, but their efficacy is unclear.[13] Waterbirth and labouring in water are popular for several reasons, and it has been suggested that by softening the perineum they might reduce the rate of tearing. However, this effect has never been clearly demonstrated.[14]

Treatment

Treatment is to either let the tear heal naturally or to surgically repair it. Third and fourth degree tears generally require surgical repair. A Cochrane review of comparing surgical treatment with natural healing of first and second degree tears found no to little difference between the two treatment options. The review concluded that there was insufficient evidence to recommend either treatment option over the other for first and second degree tears.[1]

Prevalence

A 2008 study found that over 85% of women having a vaginal birth sustain some form of perineal trauma.[15] A retrospective study of 8,603 vaginal deliveries in 1994 found a third degree tear had been clinically diagnosed in only 50 women (0.6%).[16] However, when the same authors used anal endosonography in a consecutive group of 202 deliveries, there was evidence of third degree tears in 35% of first-time mothers and 44% of mothers with previous children.[17] These numbers are confirmed by other researchers in 1999.[18]

A study by the Agency for Healthcare Research and Quality (AHRQ) found that in 2011, first- and second-degree perineal tear was the most common complicating condition for vaginal deliveries in the U.S. among women covered by either private insurance or Medicaid.[19]

Second-degree perineal laceration rates were higher for women covered by private insurance than for women covered by Medicaid.[20]

Complications

First and second degree tears rarely cause long-term problems. Among women who experience a third or fourth degree tear, 60-80% are asymptomatic after 12 months.[21] Faecal incontinence, faecal urgency, chronic perineal pain, pain with sex, and fistula formation occur in a minority of people, but may be permanent.[22] The symptoms associated with perineal tear are not always due to the tear itself, since there are often other injuries, such as avulsion of pelvic floor muscles, that are not evident on examination.[23]

There are claims that sometimes the perineum is excessively repaired after childbirth, using a so-called "husband stitch" and that this can increase vaginal tightness or result in pain during intercourse.[24]

gollark: <@337621533369303042> I guess you want that then if you *must* be C++y and evil.
gollark: I don't actually want to do this, but I mean check which subtype a node is.
gollark: Is there some way to switch over subtypes or whatever?
gollark: ADTs? ADTs ADTs. ADTs ADTs ADTs, ADTs ADTs!
gollark: ADTs!

References
  1. Elharmeel, Suzan MA; Chaudhary, Yasmin; Tan, Stephanie; Scheermeyer, Elly; Hanafy, Ashraf; van Driel, Mieke L (2011-08-10). Cochrane Pregnancy and Childbirth Group (ed.). "Surgical repair of spontaneous perineal tears that occur during childbirth versus no intervention" (PDF). Cochrane Database of Systematic Reviews (8): CD008534. doi:10.1002/14651858.CD008534.pub2. PMID 21833968.
  2. Last, R. J. (1984). Anatomy Regional and Applied. London: Churchill Livingstone. p. 345. ISBN 978-0-443-02989-9.
  3. Finn, Martha; Bowyer, Lucy; Carr, Sandra; O'Connor, Vivienne; Vollenhoven, Beverley (2005). Women's Health: A Core Curriculum. Australia: Elsevier. ISBN 978-0-7295-3736-0.
  4. Taber's Cyclopedic Medical Dictionary tabers.com
  5. "Archived copy". Archived from the original on 2011-10-01. Retrieved 2011-07-12.CS1 maint: archived copy as title (link)
  6. MDConsult mdconsult.com
  7. Rosenberg, Karen; Trevathan, Wenda (2002). "Birth, obstetrics and human evolution". BJOG: An International Journal of Obstetrics and Gynaecology. 109 (11): 1199–1206. doi:10.1046/j.1471-0528.2002.00010.x. ISSN 1470-0328. PMID 12452455.
  8. Eskandar, O; Shet, D (February 2009). "Risk factors for 3rd and 4th degree perineal tear". Journal of Obstetrics and Gynaecology. 29 (2): 119–22. doi:10.1080/01443610802665090. PMID 19274544.
  9. Caroline, Nancy L. (1977-01-03). "Medical Care in the Streets". JAMA: The Journal of the American Medical Association. 237 (1): 43–6. doi:10.1001/jama.1977.03270280045020. ISSN 0098-7484. PMID 576129.
  10. Frankman, Elizabeth A.; Wang, Li; Bunker, Clareann H.; Lowder, Jerry L. (May 2009). "Episiotomy in the United States: has anything changed?". American Journal of Obstetrics and Gynecology. 200 (5): 573.e1–573.e7. doi:10.1016/j.ajog.2008.11.022. PMID 19243733.
  11. Jiang, Hong; Qian, Xu; Carroli, Guillermo; Garner, Paul (2017-02-08). Cochrane Pregnancy and Childbirth Group (ed.). "Selective versus routine use of episiotomy for vaginal birth". Cochrane Database of Systematic Reviews. 2: CD000081. doi:10.1002/14651858.CD000081.pub3. PMC 5449575. PMID 28176333.
  12. Seehusen, DA; Raleigh, M (1 March 2014). "Antenatal perineal massage to prevent birth trauma". American Family Physician. 89 (5): 335–6. PMID 24695503.
  13. Wang, H; Jayasekara, R; Warland, J (12 March 2015). "The effect of "hands on" techniques on obstetric perineal laceration: A structured review of the literature". Women and Birth : Journal of the Australian College of Midwives. 28 (3): 194–8. doi:10.1016/j.wombi.2015.02.006. PMID 25773668.
  14. Nutter, E.; Meyer, S.; Shaw-Battista, J.; Marowitz, A. (2014). "Waterbirth: an integrative analysis of peer-reviewed literature". Journal of Midwifery & Women's Health. 59 (3): 286–319. doi:10.1111/jmwh.12194. PMID 24850284. Another popular method of perineal tearing prevention are childbirth exercisers such as Aniball or Epi-No. There are currently ongoing studies supporting their effectiveness.
  15. Kettle, C., & Tohill, S. (2008). Perineal care. Clinical evidence, 2008.
  16. Sultan AH, Kamm MA, Hudson CN (1994). "Bartram CI. Third degree obstetric anal sphincter tears: risk factors and outcome of primary repair". BMJ. 308 (6933): 887–91. doi:10.1136/bmj.308.6933.887. PMC 2539832. PMID 8173367.
  17. Sultan A, Kamm MA, Hudson CN, Thomas JM, Bartram CI (1993). "Anal sphincter disruption during vaginal delivery". N Engl J Med. 329 (26): 1905–1911. doi:10.1056/NEJM199312233292601. PMID 8247054.
  18. Fines M, Donnelly V, Behan M, O'Connell PR, O'Herlihy C (1999). "Effect of second vaginal delivery on anorectal physiology and faecal continence: a prospective study". Lancet. 354 (9183): 983–986. doi:10.1016/S0140-6736(98)11205-9. PMID 10501360.
  19. Moore JE, Witt WP, Elixhauser A (April 2014). "Complicating Conditions Associate With Childbirth, by Delivery Method and Payer, 2011". HCUP Statistical Brief #173. Rockville, MD: Agency for Healthcare Research and Quality.
  20. Moore JE, Witt WP, Elixhauser A (April 2014). "Complicating Conditions Associate With Childbirth, by Delivery Method and Payer, 2011". HCUP Statistical Brief #173. Rockville, MD: Agency for Healthcare Research and Quality.
  21. Toglia, Marc. "Repair of episiotomy and perineal lacerations associated with childbirth". UpToDate. Retrieved 22 May 2015.
  22. Fernando, RJ; Sultan, AH; Kettle, C; Radley, S; Jones, P; O'Brien, PM (June 2006). "Repair techniques for obstetric anal sphincter injuries: a randomized controlled trial". Obstetrics and Gynecology. 107 (6): 1261–8. doi:10.1097/01.aog.0000218693.24144.bd. PMID 16738150.
  23. Lammers, K; Prokop, M; Vierhout, ME; Kluivers, KB; Fütterer, JJ (August 2013). "A pictorial overview of pubovisceral muscle avulsions on pelvic floor magnetic resonance imaging". Insights into Imaging. 4 (4): 431–41. doi:10.1007/s13244-013-0261-9. PMC 3731469. PMID 23756995.
  24. Vinopal, Lauren (17 August 2017). "Are Husbands and Doctors Conspiring to Sew New Moms Up Too Tight?". Fatherly. Retrieved 15 October 2017.
Classification
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