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Internal anal sphincter injury in the immediate postpartum period; Prevalence, risk factors and diagnostic methods in the Swedish perineal laceration registry
Region Östergötland, Barn- och kvinnocentrum, Kvinnokliniken i Linköping. Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, Kvinnokliniken i Linköping.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, Kvinnokliniken i Linköping.
2020 (engelsk)Inngår i: European Journal of Obstetrics, Gynecology, and Reproductive Biology, ISSN 0301-2115, E-ISSN 1872-7654, Vol. 245, s. 1-6Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Risk factors for obstetric external anal sphincter injury are well known. Maternal and obstetric risk factors for internal anal sphincter injury are not extensively studied.

The rationale of this study was to evaluate the proportion of internal anal sphincter injury in women with external anal sphincter injury, diagnosed immediately after delivery.

This study will assess whether there are additional risks for obstetric internal anal sphincter injury.

Objectives

The primary aim was to assess the proportion of internal anal sphincter injury immediately in women with an external sphincter injury and to evaluate maternal and obstetric risk factors for internal anal sphincter injury in women with an external anal sphincter injury only.

A secondary aim was to relate the diagnostic methods used for obstetric perineal lacerations to the presence of an internal anal sphincter injury.

Study Design

A registry study with data from the Swedish Perineal Laceration Registry 2014–2018.

From the registry, the maternal and obstetric characteristics of 3,333 primiparous women with isolated external (N = 2,236) versus both external and internal (N = 1,097) anal sphincter injuries were studied, as were the methods used for examining the obstetric anal sphincter injuries.

Results

In 32.9 % (1,097/3,333) of primiparous women with an external anal sphincter injury, an internal anal sphincter injury was diagnosed immediately after delivery. A perineal palpatory thickness of less than 10 mm was a diagnostic sign for internal sphincter injury. Well-known risk factors associated with obstetric anal sphincter injuries could not be confirmed as independent risk factors for internal sphincter injury. When the infant is born with an arm beside the head, there is an almost two-fold increased risk for internal sphincter injury.

Conclusions

Our main finding is that 32.9 % of women with external anal sphincter injury also have an internal anal sphincter injury. A palpable perineal thickness of less than 10 mm, a degree 4-laceration and an infant born with a hand by the head increases the risk of internal sphincter injury and should be a clinical warning sign.

sted, utgiver, år, opplag, sider
Amsterdam: Elsevier, 2020. Vol. 245, s. 1-6
Emneord [en]
Obstetric perineal laceration, internal anal sphincter injury
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-162583DOI: 10.1016/j.ejogrb.2019.11.030PubMedID: 31825790Scopus ID: 2-s2.0-85075878318OAI: oai:DiVA.org:liu-162583DiVA, id: diva2:1376335
Tilgjengelig fra: 2019-12-09 Laget: 2019-12-09 Sist oppdatert: 2019-12-16bibliografisk kontrollert
Inngår i avhandling
1. Clinical and methodological aspects on perineal laceration diagnostics at childbirth
Åpne denne publikasjonen i ny fane eller vindu >>Clinical and methodological aspects on perineal laceration diagnostics at childbirth
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Background: Obstetric perineal lacerations are common after vaginal birth. The degree of obstetric perineal laceration is defined by the extent of tissue involved in the laceration. When a perineal laceration has occurred after vaginal delivery, the examination for correct diagnostics is essential before primary suturing. Standard immediate postpartum care is an inspection and palpation of the obstetric perineal laceration. The aim of this thesis was to explore the diagnostics of obstetric perineal lacerations, and to examine how the methods of bidigital perineal palpation and transperineal ultrasound postpartum can contribute to the clinical diagnostic decisions before primary repair.

Material and Methods: Study I is a methodological study of transperineal ultrasound of the anovaginal distance. The learning curve and inter-observer agreement of the method is studied between three examiners in an outpatient gynaecological setting. Study II is a prospective observational study of 150 primiparous women with suspected perineal laceration of degree 2-3 immediately after childbirth and the association between bidigital palpation of the perineal height, the anovaginal distance and the final diagnosis of the perineal laceration. Study III is a retrospective observational study with data from the Swedish national Perineal Laceration Registry, studying maternal and obstetric risk factors for internal anal sphincter injury in 3,333 women with external sphincter injury. Study IV is a follow-up study focusing on the implementation strategies and outcome when introducing a new method, (the Diagnostics After DELivery – DADEL concept) for examining perineal lacerations at a maternity ward. The DADEL concept consists of a combination of bidigital palpation of the perineal tissues and transperineal ultrasound in order to determine the degree of perineal lacerations.

Results and conclusions: In study I, the method of transperineal ultrasound measurement of anovaginal distance revealed a short learning period and high interobserver agreement. This indicated that the method can be taught and reliably used in further research and clinical practice. In study II, women with external sphincter injury had a shorter anovaginal distance compared to women without this injury. The palpatory perineal thickness was associated with the anovaginal distance. Study III showed that 33% of primiparous women with an external anal sphincter injury also had an internal anal sphincter injury diagnosed immediately after delivery. When the infant was born with a hand or arm beside the head, there was an increased risk for internal anal sphincter injury. Perineal palpatory thickness of less than 10 mm was significantly associated with an internal anal sphincter injury. In the follow-up study of diagnostic methods showed a significantly higher use of bidigital palpation five years after introduction of the DADEL concept. The use of transperineal ultrasound showed no significant change during the same period.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2019. s. 68
Serie
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1715
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-162580 (URN)10.3384/diss.diva-162580 (DOI)9789179299620 (ISBN)
Disputas
2020-01-17, Belladonna, University Hospital Campus, Linköping, 09:00 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2019-12-09 Laget: 2019-12-09 Sist oppdatert: 2020-01-08bibliografisk kontrollert

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Pihl, SofiaBlomberg, MarieUustal Fornell, Eva

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