References
1. Pergialiotis V, Bellos I, Fanaki M, Vrachnis N, Doumouchtsis SK. Risk
factors for severe perineal trauma during childbirth: An updated
meta-analysis. Eur J Obstet Gynecol Reprod Biol. 2020;247:94-100.
2. Ampt AJ, Ford JB, Roberts CL, Morris JM. Trends in obstetric anal
sphincter injuries and associated risk factors for vaginal singleton
term births in New South Wales 2001-2009. Aust N Z J Obstet Gynaecol.
2013;53(1):9-16.
3. Jha S, Parker V. Risk factors for recurrent obstetric anal sphincter
injury (rOASI): a systematic review and meta-analysis. Int Urogynecol J.
2016;27(6):849-57.
4. Dudding TC, Vaizey CJ, Kamm MA. Obstetric anal sphincter injury:
incidence, risk factors, and management. Ann Surg. 2008;247(2):224-37.
5. Laine K, Gissler M, Pirhonen J. Changing incidence of anal sphincter
tears in four Nordic countries through the last decades. Eur J Obstet
Gynecol Reprod Biol. 2009;146(1):71-5.
6. Sultan AH, Kamm MA, Hudson CN, Thomas JM, Bartram CI. Anal-sphincter
disruption during vaginal delivery. N Engl J Med. 1993;329(26):1905-11.
7. Oberwalder M, Connor J, Wexner SD. Meta-analysis to determine the
incidence of obstetric anal sphincter damage. Br J Surg.
2003;90(11):1333-7.
8. Gommesen D, Nohr E, Qvist N, Rasch V. Obstetric perineal tears,
sexual function and dyspareunia among primiparous women 12 months
postpartum: a prospective cohort study. BMJ Open. 2019;9(12):e032368.
9. Evers EC, Blomquist JL, McDermott KC, Handa VL. Obstetrical anal
sphincter laceration and anal incontinence 5-10 years after childbirth.
Am J Obstet Gynecol. 2012;207(5):425 e1-6.
10. Cornelisse S, Arendsen LP, van Kuijk SM, Kluivers KB, van Dillen J,
Weemhoff M. Obstetric anal sphincter injury: a follow-up questionnaire
study on longer-term outcomes. Int Urogynecol J. 2016;27(10):1591-6.
11. Pollack J, Nordenstam J, Brismar S, Lopez A, Altman D, Zetterstrom
J. Anal incontinence after vaginal delivery: a five-year prospective
cohort study. Obstet Gynecol. 2004;104(6):1397-402.
12. Wagenius J, Laurin J. Clinical symptoms after anal sphincter
rupture: a retrospective study. Acta Obstet Gynecol Scand.
2003;82(3):246-50.
13. Gommesen D, Nohr EA, Qvist N, Rasch V. Obstetric perineal
ruptures-risk of anal incontinence among primiparous women 12 months
postpartum: a prospective cohort study. Am J Obstet Gynecol.
2020;222(2):165 e1- e11.
14. Laine K, Skjeldestad FE, Sandvik L, Staff AC. Prevalence and Risk
Indicators for Anal Incontinence among Pregnant Women. ISRN Obstet
Gynecol. 2013;2013:947572.
15. Leeman L, Rogers R, Borders N, Teaf D, Qualls C. The Effect of
Perineal Lacerations on Pelvic Floor Function and Anatomy at 6 Months
Postpartum in a Prospective Cohort of Nulliparous Women. Birth.
2016;43(4):293-302.
16. Groom KM, Paterson-Brown S. Can we improve on the diagnosis of third
degree tears? Eur J Obstet Gynecol Reprod Biol. 2002;101(1):19-21.
17. Andrews V, Sultan AH, Thakar R, Jones PW. Risk factors for obstetric
anal sphincter injury: a prospective study. Birth. 2006;33(2):117-22.
18. Andrews V, Thakar R, Sultan AH. Structured hands-on training in
repair of obstetric anal sphincter injuries (OASIS): an audit of
clinical practice. Int Urogynecol J Pelvic Floor Dysfunct.
2009;20(2):193-9.
19. Harvey MA, Pierce M, Alter JE, Chou Q, Diamond P, Epp A, et al.
Obstetrical Anal Sphincter Injuries (OASIS): Prevention, Recognition,
and Repair. J Obstet Gynaecol Can. 2015;37(12):1131-48.
20. Laine K, Skjeldestad FE, Sandvik L, Staff AC. Incidence of obstetric
anal sphincter injuries after training to protect the perineum: cohort
study. BMJ Open. 2012;2(5).
21. Naidu M, Sultan AH, Thakar R. Reducing obstetric anal sphincter
injuries using perineal support: our preliminary experience. Int
Urogynecol J. 2017;28(3):381-9.
22. Tunestveit JW, Baghestan E, Natvig GK, Eide GE, Nilsen ABV. Factors
associated with obstetric anal sphincter injuries in midwife-led birth:
A cross sectional study. Midwifery. 2018;62:264-72.
23. Hals E, Oian P, Pirhonen T, Gissler M, Hjelle S, Nilsen EB, et al. A
multicenter interventional program to reduce the incidence of anal
sphincter tears. Obstet Gynecol. 2010;116(4):901-8.
24. De Meutter L, A DvH, van der Woerdt-Eltink I, de Leeuw JW.
Implementation of a perineal support programme for reduction of the
incidence of obstetric anal sphincter injuries and the effect of
non-compliance. Eur J Obstet Gynecol Reprod Biol. 2018;230:119-23.
25. Skriver-Moller AC, Madsen ML, Poulsen MO, Overgaard C. Do we know
enough? A quality assessment of the Finnish intervention to prevent
obstetric anal sphincter injuries. J Matern Fetal Neonatal Med.
2016;29(21):3461-6.
26. Jango H, Westergaard HB, Kjaerbye-Thygesen A, Langhoff-Roos J,
Lauenborg J. Changing incidence of obstetric anal sphincter injuries-A
result of formal prevention programs? Acta Obstet Gynecol Scand.
2019;98(11):1455-63.
27. Gurol-Urganci I, Bidwell P, Sevdalis N, Silverton L, Novis V,
Freeman R, et al. Impact of a quality improvement project to reduce the
rate of obstetric anal sphincter injury: a multicentre study with a
stepped-wedge design. BJOG. 2021;128(3):584-92.
28. Poulsen MO, Madsen ML, Skriver-Moller AC, Overgaard C. Does the
Finnish intervention prevent obstetric anal sphincter injuries? A
systematic review of the literature. BMJ Open. 2015;5(9):e008346.
29. Laine K, Rotvold W, Staff AC. Are obstetric anal sphincter ruptures
preventable?– large and consistent rupture rate variations between
the Nordic countries and between delivery units in Norway. Acta Obstet
Gynecol Scand. 2013;92(1):94-100.
30. Hehir MP, Fitzpatrick M, Cassidy M, Murphy M, O’Herlihy C. Are women
having a vaginal birth after a previous caesarean delivery at increased
risk of anal sphincter injury? BJOG. 2014;121(12):1515-20.
31. Ramm O, Woo VG, Hung YY, Chen HC, Ritterman Weintraub ML. Risk
Factors for the Development of Obstetric Anal Sphincter Injuries in
Modern Obstetric Practice. Obstet Gynecol. 2018;131(2):290-6.
32. Selmer-Olsen T, Nohr EA, Tappert C, Eggebo TM. Incidence and risk
factors for obstetric anal sphincter ruptures, OASIS, following the
introduction of preventive interventions. A retrospective cohort study
from a Norwegian hospital 2012-2017. Sex Reprod Healthc. 2019;22:100460.
33. The Norwegian Institute of Public Health. 2021 [cited 2021
24.03.2021]. Available from:
https://www.fhi.no/en/hn/health-registries/medical-birth-registry-of-norway/.
34. Seijmonsbergen-Schermers AE, Zondag DC, Nieuwenhuijze M, van den
Akker T, Verhoeven CJ, Geerts CC, et al. Regional variations in
childbirth interventions and their correlations with adverse outcomes,
birthplace and care provider: A nationwide explorative study. PLoS One.
2020;15(3):e0229488.
35. Gaudernack LC, Froslie KF, Michelsen TM, Voldner N, Lukasse M.
De-medicalization of birth by reducing the use of oxytocin for
augmentation among first-time mothers - a prospective intervention
study. BMC Pregnancy Childbirth. 2018;18(1):76.
36. O’Driscoll K MD, Boylan P. Active management of labour. 3rd ed.
London: Mosby; 1993.
37. Smyth RM, Alldred SK, Markham C. Amniotomy for shortening
spontaneous labour. Cochrane Database Syst Rev. 2013(1):CD006167.
39. Rygh AB, Skjeldestad FE, Korner H, Eggebo TM. Assessing the
association of oxytocin augmentation with obstetric anal sphincter
injury in nulliparous women: a population-based, case-control study. BMJ
Open. 2014;4(7):e004592.
39. Zhang J, Branch DW, Ramirez MM, Laughon SK, Reddy U, Hoffman M, et
al. Oxytocin regimen for labor augmentation, labor progression, and
perinatal outcomes. Obstet Gynecol. 2011;118(2 Pt 1):249-56.
40. Oscarsson ME, Amer-Wahlin I, Rydhstroem H, Kallen K. Outcome in
obstetric care related to oxytocin use. A population-based study. Acta
Obstet Gynecol Scand. 2006;85(9):1094-8.