Early secondary repair of obstetric anal sphincter injury: postoperative complications, long-term functional outcomes, and impact on quality of life

Early Resuturing versus expectant Management for Perineal Wound Dehiscence: A systematic review

BACKGROUND AND OBJECTIVE

Perineal wound dehiscence is a common complication of vaginal birth that impacts maternal well-being and quality of life. This systematic review compares early resuturing with expectant management in the treatment of perineal wound dehiscence.

METHODS

We searched Ovid MEDLINE, CINAHL, and PubMed databases, and hand-searched recent reviews and relevant studies. Human prospective and retrospective studies, randomized controlled trials (RCTs), and case series evaluating early resuturing within the postnatal period were included. Two reviewers independently assessed the studies for outcomes and risk of bias. The primary outcome was healing time; secondary outcomes included dyspareunia, long-term symptoms, functional outcomes, infection rates, and anal sphincter injury.

RESULTS

Thirteen studies (1987-2022) were included: three RCTs, four prospective cohort studies or case series, and six retrospective studies-heterogeneity in study designs and outcomes limited data synthesis. Early resuturing was associated with reduced healing time, particularly for wounds not involving the anal sphincter, but increased the risk of complications such as fistula formation. Many studies emphasized meticulous preoperative wound care.

CONCLUSIONS

Limited evidence suggests that early resuturing may reduce healing time without increasing wound infection risk. However, the increased risk of complications necessitates cautious application and highlights the importance of preoperative wound care. Further robust research is needed, although challenging to conduct. Alternative analytical methods, such as data mining and decision tree algorithms, should be explored. Based on current evidence, clinicians should carefully individualize recommendations on the benefits and risks of early resuturing.

Obstetric anal sphincter injuries (OASIS) and secondary repair (overlapping sphincteroplasty) in a colorectal unit: case series

Background

Obstetric anal sphincter injuries (OASIS) represent a significant complication of childbirth, with global variation in incidence. Although overlapping sphincteroplasty is widely regarded as the gold-standard surgical treatment, managing delayed or inadequately repaired cases remains challenging. Prevention through improved obstetric practices and early recognition of injuries is considered the optimal approach to minimizing the burden of OASIS.

Objectives

This case series aimed to evaluate the clinical outcomes of overlapping sphincteroplasty in patients presenting with delayed or missed OASIS.

Methods

The study included 12 female patients treated at a single institution over 4 years. All participants had a history of instrumental delivery and episiotomy, with symptoms of incontinence. Preoperative and postoperative assessments were performed using the Wexner scoring system. Overlapping sphincteroplasty was performed in all cases. Follow-up was conducted at 3 months, 6 months, 1 year, and 2 years to evaluate symptomatic improvement and patient satisfaction.

Results

The mean age of the participants was 38 years (range: 26-53 years). All patients experienced symptomatic improvement following surgery, with significant reductions in the Wexner scores and high patient satisfaction rates. The mean duration of symptoms before surgery was 14 months (3-36 months). Complications included a 25% rate of superficial wound breakdown and one case of deep wound breakdown requiring secondary repair. Despite this, no incontinence symptoms were reported at the 2-year follow-up.

Conclusions

Delayed overlapping sphincteroplasty is an effective surgical approach for treating missed or inadequately repaired OASIS, offering satisfactory outcomes. However, prevention through improved obstetric practices remains an optimal strategy.

Guideline No. 457: Obstetrical Anal Sphincter Injuries (OASIS) Part I: Prevention, Recognition, and Immediate Management

OBJECTIVE

The purpose of this guideline is to promote recognition and preventive strategies for obstetrical anal sphincter injuries. Furthermore, it provides guidance on primary repair and immediate postpartum management for obstetrical anal sphincter tears in order to minimize further negative sequelae.

TARGET POPULATION

All patients having a vaginal delivery and those who have sustained an obstetrical anal sphincter injury.

OUTCOMES

Certain preventive strategies have been associated with lower rates of obstetrical anal sphincter injuries (e.g., fetal head flexion and control, appropriate use of mediolateral episiotomy). Management strategies, including appropriate diagnosis and repair of obstetrical anal sphincter injuries, antibiotic prophylaxis, and bowel and bladder function management can decrease associated short- and long-term complications.

BENEFITS, HARMS, AND COSTS

Implementation of the recommendations in this guideline may increase detection, prevention, and appropriate management of obstetrical anal injuries, thus limiting the future burden associated with these injuries. Implementation of the recommended classification of obstetrical anal sphincter injuries will improve national and international research efforts.

EVIDENCE

Published literature was retrieved through searches of PubMed, Ovid, Medline, Embase, Scopus, and the Cochrane Library from September 1, 2014, through November 30, 2023, using appropriate MeSH terms (delivery, obstetrics, obstetric surgical procedures, obstetric labor complications, anal canal, episiotomy) and keywords (OASIS, obstetrical anal sphincter injury, anal injury, anal sphincter, vaginal delivery, suture, fecal incontinence, anal incontinence, overlap repair, end-to-end repair, bladder protocol, analgesia). Results were restricted to systematic reviews, meta-analyses, randomized controlled trials/controlled clinical trials, observational studies, and clinical practice guidelines. Results were limited to English- or French-language materials. Evidence was supplemented with references from the 2015 Society of Obstetricians and Gynaecologists of Canada guideline no. 330.

VALIDATION METHODS

The authors rated the quality of evidence and strength of recommendations using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach. See online Appendix A (Tables A1 for definitions and A2 for interpretations of strong and conditional recommendations).

INTENDED AUDIENCE

Obstetrical care providers.

TWEETABLE ABSTRACT

Updated Canadian guideline on recognition, prevention and management of obstetrical anal sphincter injuries (OASIS).

SUMMARY STATEMENTS

RECOMMENDATIONS.

A UK wide survey of general surgeons' experience of the primary repair of obstetric anal sphincter injuries

AIM

Obstetric anal sphincter injuries (OASIs) are associated with devastating consequences, mainly faecal incontinence. A timely and correct repair is necessary to reduce the risk of maternal morbidity. The aim was to explore the experience and practice of on-call general surgeons in the acute repair of OASIs.

METHOD

A cross-sectional, observational questionnaire study was performed. Registrars and consultants participating in an emergency general surgical rota in the UK were included. A 33-item questionnaire was disseminated over a 9-month period from April 2023. A descriptive, thematic analysis of the data was undertaken.

RESULTS

In all, 310 responses were analysed. 42.3% of colorectal respondents (of which 29% were pelvic floor specialists), 24.3% of general surgeons, 16.7% of hepato-biliary surgeons and 13.7% of upper gastrointestinal surgeons were contacted to assist with an acute repair. Of those contacted, 52.3% typically assisted with a 3C or 4 tear, 54.2% received no training and 95.5% performed less than three acute repairs in the previous year. 57.6% of all respondents were not confident at all in the repair of these injuries, 55% highlighted a lack of experience and 36% mentioned a curricular gap.

CONCLUSION

Surgeons may be called to assist with an acute OASI repair, particularly in cases of severe anatomical disruption. This occurs infrequently. There is a lack of consensus as to who is responsible for these injuries. Obstetricians have structured training in both the recognition and repair of these injuries. This paper serves to highlight the lack of training for surgeons who report doing this surgery despite lacking the required competences.

Is vaginal birth after cesarean section a risk factor for obstetric anal sphincter injury?

OBJECTIVE

To investigate whether women undergoing their first vaginal delivery after a previous cesarean section (secundiparous) are at increased risk for obstetric anal sphincter injury (OASI) compared with primiparous women.

METHODS

A retrospective cohort study of 85 428 women who delivered vaginally over a 10-year period in a single tertiary medical center. Incidence of OASI, risk factors, and clinical characteristics were compared between primiparous women who delivered vaginally and secundiparous women who underwent their first vaginal birth after cesarean section (VBAC). A multivariable logistic regression analysis was used to study the association between VBAC and OASI.

RESULTS

Overall, 36 250 primiparous and 1602 secundiparous women were enrolled, 309 of whom had OASI. The rates of OASI were similar among secundiparous women who had VBAC and primiparous women who underwent vaginal delivery (15 [0.94%] vs 294 [0.81%], P = 0.58). The proportions of third- and fourth-degree tears were also similar among secundiparous and primiparous women who experienced OASI (87% vs 91.5%, and 13% vs 8.5%, respectively, P = 0.68). Furthermore, the rates of OASI were similar in both study groups, although secundiparous women who underwent VBAC had higher rates of birth weights exceeding 3500 g (414 [25.8%] vs 8284 [22.8%], P = 0.016), and higher rates of vacuum-assisted deliveries (338 [21%] vs 6224 [17.2%], P < 0.001). A multivariate logistic regression analysis failed to establish a statistically significant association between VBAC and OASI (odds ratio 0.672, 95% confidence interval 0.281-1.61, P = 0.37).

CONCLUSIONS

No increased risk for OASI was found in secundiparous women who underwent VBAC compared with primiparous women at their first vaginal birth.

How to Avoid Becoming a Risk Factor of Fecal Incontinence Due to OASIS-A Narrative Review

Third- and fourth-degree anal sphincter injuries are among the most severe traumas women can experience during childbirth, often leading to lifelong continence issues. Despite extensive research, current repair techniques are often inadequate, failing to provide long-term efficiency. The repair of OASIS tends to worsen with time as fecal or anal incontinence increases. This article presents the risk factors for primary repair failure differently from those previously described in the literature, specifically focusing on avoidable risk factors related to obstetricians and surgeons who perform OASIS repair. After reviewing the literature, the following risk areas were identified and described: recurrent OASIS, pitfalls of the current WHO classification, surgical techniques, place in which the repair should be performed, surgical training, factors related to low volumes of patients with grade III-IV injuries, timing of the repair, and failure of primary repair.

The Reliability of 3-Dimensional Endoanal Ultrasonography Early and Late Postpartum

IMPORTANCE

There is no consensus on how to define obstetric anal sphincter defects detected by 3-dimensional endoanal ultrasonography (3D-EAUS), and the reported rates vary significantly in the postpartum period.

OBJECTIVE

The objective of this study was to establish a diagnostic strategy with a high and clinically relevant interrater reliability both early and late postpartum.

STUDY DESIGN

The study was prospective and observational, and 3D-EAUS was performed 10-14 days and 9-12 months postpartum in an unselected cohort of primiparous women with vacuum-assisted deliveries. Two experienced examiners evaluated the ultrasonographic results, which were divided into the categories intact, inconclusive, small, moderate, and large defects based on Starck scores. Three different diagnostic strategies were validated, and the prevalence- and bias-adjusted kappa (PABAK) values calculated.

RESULTS

Of 334 eligible women, 184 (55.1%) completed both examinations. Disagreements involving small defects were predominant and observed in 34 and 39 cases, respectively, at the 2 time points. The highest overall agreement rates (91.3% and 92.4%, respectively) and PABAK values (0.83 and 0.85, respectively) were reached when the disagreements were minimized by dichotomizing the results into Starck scores >4 (designated a significant defect) versus Starck scores 0-4 (all others).

CONCLUSIONS

The interrater reliability of detecting small anal sphincter defects by 3D-EAUS was low at both time points for the 2 experienced raters. In contrast, the interrater reliability of detecting a significant defect was classified as almost perfect agreement at both time points.

Three-Dimensional Transperineal Ultrasound Guiding Early Secondary Repair of Obstetric Anal Sphincter Injury in an Incontinent Patient without Suture Dehiscence

We present the case of a 36-year-old primigravida who gave birth to a 3200 g baby by vacuum-assisted (Kiwi OmniCup™) operative vaginal delivery with mediolateral episiotomy. A "y"-shaped perineal tear with a grade IIIC obstetric anal sphincter injury (OASI) was diagnosed and repaired. Two days after delivery, in the absence of suture dehiscence, she started experiencing complete anal incontinence. A decision was made in association with a proctologic surgeon for an early secondary repair. Before surgery, a Three-dimensional transperineal ultrasound (TPUS) was performed. The exam revealed a major defect of the external anal sphincter at the 11 o'clock position. This allowed for the reopening of only a circumscribed area of the perineal suture and repair of the sphincters using the end-to-end technique. The symptoms regressed completely, and follow-up TPUS demonstrated the gradual wound healing process. Anal incontinence, secondary to obstetric anal sphincter injury (OASI), has a severe negative impact on women's quality of life. TPUS is an effective method to detect sphincter defects and monitor the healing process. This report investigates the feasibility of identifying the sphincter tear in an incontinent puerperal patient without suture dehiscence in order to target early secondary repair while minimizing its extent. TPUS has proven a safe and effective tool to guide early secondary repair of symptomatic OASI complications while minimizing the invasiveness of the procedure. Multidisciplinary management is crucial to ensure the adequate standard of care.

Obstetric anal sphincter injuries (OASIS): using transperineal ultrasound (TPUS) for detecting, visualizing and monitoring the healing process

Purpose

The aim of this study was to examine whether OASIS, and its extent, can be confirmed or excluded using transperineal ultrasound (TPUS). A further objective of this study was to monitor the healing process over a period of 6 months and to establish a connection between the sonographic appearance of obstetric anal sphincter injury (OASIS) and anal incontinence.

Materials and methods

In this retrospective clinical study, women with OASIS who gave birth between March 2014 and August 2019 were enrolled. All the patients underwent TPUS 3 days and 6 months after delivery. A GE E8 Voluson ultrasound system with a 3.5–5 MHz ultrasound probe was used. The ultrasound images showed a third-degree injury, with the measurement of the width of the tear and its extent (superficial, partial, complete, EAS and IAS involvement). A positive contraction effect, a sign of sufficient contraction, was documented. Six months after delivery, a sonographic assessment of the healing (healed, scar or still fully present) was performed. A Wexner score was obtained from each patient. The patients’ medical histories, including age, parity, episiotomy and child’s weight, were added.

Results

Thirty-one of the 55 recruited patients were included in the statistical evaluation. Three patients were excluded from the statistical evaluation because OASIS was excluded on TPUS 3 days after delivery. One patient underwent revision surgery for anal incontinence and an inadequately repaired anal sphincter injury, as shown sonographic assessment, 9 days after delivery. Twenty patients were excluded for other reasons. The results suggest that a tear that appears smaller (in mm) after 3 days implies better healing after 6 months. This effect was statistically significant, with a significance level of alpha = 5% (p = 0.0328). Regarding anal incontinence, women who received an episiotomy had fewer anal incontinence symptoms after 6 months. The effect of episiotomy was statistically significant, with a significance level of alpha = 5% (p = 0.0367).

Conclusion

TPUS is an accessible, non-invasive method for detecting, quantifying, following-up and monitoring OASIS in patients with third-degree perineal tears. The width, as obtained by sonography, is important with regard to the healing of OASIS. A mediolateral episiotomy seems to prevent anal incontinence after 6 months.

Short and long term results of anatomical reconstruction of perineal body and sphincter complex in obstetric anal sphincter injuries

OBJECTIVES

The effective way to reduce the risk of fecal incontinence (FI) in primary repaired obstetric anal sphincter injuries (OASIS) patients is to accurately detect the injury and provide complete anatomical reconstruction. The aim of the study was to evaluate the short-term and long-term results of OASIS cases that were diagnosed by an experienced surgical team and whose perineal body and anal sphincters were reconstructed separately.

MATERIAL AND METHODS

Sixteen patients that required consultations due to anal sphincter damage during vaginal delivery and underwent anatomical reconstruction due to Grade 3c and Grade 4 sphincter damage between 2007 and 2019 were included in the study. These cases were divided into three groups [Group 1 (≤12 months), Group 2 (12-60 months), Group 3 (≥60 months)] according to the time elapsed until anal manometry, and incontinence questionnaires were conducted in the postoperative period. Recto-anal inhibitory reflex (RAIR), mean resting (IB) and squeezing (SB) pressures were measured by anal manometry. Anal incontinence (AI) and FI rates were determined by questionnaires. Anal sphincter damage repair techniques (overlapping, end-to-end) were determined. These parameters were compared between the three groups.

RESULTS

Mean age of the patients was 27.5 (16-35) years. Six (37.5%) patients had Grade 3c, while 10 (62.5%) had Grade 4 injury. The overall mean RP and SP were 35 (26-56) mmHg and 67 (31-100) mmHg, respectively. Mean RP and SP were 46/67 mmHg, 33.5/75.5 mmHg, and 37.5/70.5 mmHg in Groups 1, 2, and 3 respectively. There was no difference between the three groups in terms of mean RP and SP (p= 0.691, p= 0.673). The rate of AI and FI in all patients were 18.75% and 12.5%, respectively while the rate of severe AI incontinence was 6%. Severe AI was observed in 1 (16.7%) case in Group 1, mild AI was observed in 1 (25%) case in group 2, and in 1 (16.7%) case in Group 3. RAIR was positive in all patients. In Group 1, 5 (83.3%) patients underwent overlapping repair, and in Group 3, 6 (100%) patients underwent end-to-end repair. This difference was statistically significant (p= 0.011).

CONCLUSION

In vaginal births, evaluation of anal sphincter damage, determination of perineal body structures and anal sphincters separately and performing anatomical reconstruction when needed significantly reduce the rate of FI in the short and long term.

Early secondary repair of obstetric anal sphincter injuries (OASIs): experience and a review of the literature

INTRODUCTION AND HYPOTHESIS

Secondary anal sphincter repair for a dehisced obstetric anal sphincter injury (OASI) is required following 2.6% of primary repairs. There is growing evidence that instead of delaying repair for 3-6 months, early secondary repair of the anal sphincter can be completed within 14 days. Our aims were to review the literature and to describe experiences in our unit.

METHODS

This is a narrative review of all published cases reporting outcomes of early secondary repair of dehisced OASIs. In addition, we report a series from Croydon University Hospital (CUH) between 2010 and 2019.

RESULTS

Ninety patients from five studies were identified on literature search. Six patients from CUH were included in the case series. Overall, the most common complications following secondary repair included skin dehiscence [10.3% (n = 10)], infection [5.2% (n = 5)] and fistula formation [8.2% (n = 8)]. In our case series, following secondary repair, normal manometric incremental squeeze pressure was found in five women (83%). Also, on endoanal ultrasound, internal anal sphincter (IAS) defects were found in 75% with a history of IAS injury (n = 4). There were no full-thickness external anal sphincter defects. Compared to those requiring primary repair alone, residual defects were significantly larger in those who also underwent secondary repair (Starck score 2.1 vs. 5.7, p = 0.01).

CONCLUSION

Early secondary repair is a feasible surgical procedure for the reconstruction of dehisced OASIs. This case series and review of the literature can be used to support clinicians in the management of primary OASI repair dehiscence.

Traumatic deficient perineum: surgical management and outcome from a single center

INTRODUCTION AND HYPOTHESIS

Deficient perineum is a disruption of the perineal body and distal rectovaginal septum presenting with anal incontinence and a range of urogenital symptoms. There is scarce reported outcome of this condition with management often delayed and with a variety of surgical alternatives. This study aims to determine faecal continence outcomes after long-term surgical repair.

METHODS

Patients were included for analysis after surgical repair between 1989 and 2012. Cases were preoperatively assessed by endosonography and anorectal manometry with a record of their continence with the Cleveland Clinic Incontinence Score (CCIS). Surgical repair comprised an overlapping repair of the external anal sphincter (EAS) with levatorplasty. There was selective use of internal anal sphincter (IAS) suture and/or advancement perineoplasty for soft tissue reconstruction. Patients were clinically evaluated for functional outcomes with comparison of their postoperative CCIS.

RESULTS

There were 20 patients (median age 55.5 years; range 29-81 years) with a median duration of incontinence symptoms of 174 (range 1-540) months. All patients had an EAS and IAS defect with 14 (70%) undergoing an IAS suture and 10 (50%) a Corman-style anoplasty. Over a median follow-up of 137.2 (range 13-322) months, there was a significant decrease in the recorded median preoperative vs. postoperative CCIS 18, range 13-20 vs. 2, range 0-10, respectively; p < 0.001) with 18 (90%) satisfied with the functional outcome. Faecal diversion was not used in any of the patients.

CONCLUSIONS

Experienced delayed repair of a traumatic cloaca is associated with an acceptable functional outcome at medium- to long-term follow-up.

Can ultrasound 10 days after obstetric anal sphincter injury predict anal incontinence at long-term follow-up?

INTRODUCTION AND HYPOTHESIS

The objective was to investigate whether endoanal ultrasound (EAUS) performed 10 days after a primary repaired obstetric anal sphincter injury (OASIS) can predict the severity of anal incontinence (AI) in the long term.

METHODS

This prospective cohort study included women with a primary repaired 3b-degree tear, 3c-degree tear or fourth-degree tear at Aarhus University Hospital, Denmark, from 1 September 2010 to 31 May 2011. Clinical assessment and EAUS were performed on day 2, day 10, and day 20 after delivery. Functional outcomes were assessed using a questionnaire at the time of all clinical visits and at the long-term follow-up, 7 years after delivery. AI was graded according to the Wexner score and EAUS defects were graded according to the Starck score.

RESULTS

Ninety-six out of 99 women consented to participate. Five women had a secondary sphincter repair and were subsequently excluded from follow-up. Fifty-seven women underwent both EAUS 10 days after delivery and answered the long-term follow-up questionnaire. Median follow-up time was 7.7 years (IQR 7.4-7.8). Mean Wexner score was 4.4 ± 4.8 10 days after delivery and 2.5 ± 2.8 at follow-up; thus, the Wexner score improved over time (p = 0.01). Ultrasound sphincter defects were found in 82.6% of the women. Mean Starck score was 3.0 ± 1.8. The risk of AI was 0% (95% CI 0.0-30.8) if the Starck score was 0. No correlation was found between the Starck score and the Wexner score at follow-up.

CONCLUSIONS

We found that performing EAUS in the puerperium following OASIS has limited value in predicting long-term AI.

Management and consequences of obstetrical anal sphincter injuries: Review

Obstetrical anal sphincter injuries (OASI), formerly referred to as "complete" or "incomplete" perineal tears, are a frequent complication of childbirth. They can lead to intestinal consequences (anal incontinence, ano-genital fistula) or sexual consequences (dyspareunia, genital pain). The complexity of management of OASI lies in the multi-factorial nature of these consequences but also in the frequently lengthy interval before their appearance, often long after childbirth. Indeed, while 2.4% of women in childbirth develop OASI, up to 61% of them will present with anal incontinence15 to 25 years after childbirth. Immediate or delayed repair of the sphincter and perineum within a few hours of injury is therefore the rule, but there is no consensus on longer-term management. The patient must be educated on preventive actions (avoidance of pushing or straining, regularization of stool transit, muscle strengthening, etc.). Early detection of anal incontinence leads to prompt management, which is more effective. This review aims to synthesize the information necessary to provide clear and up-to-date patient information on OASI (risk factors and prevalence), the management of OASI, and the management of eventual complications in the setting of dedicated specialty consultations. Dedicated "post-OASI" consultations by a specialist in ano-perineal pathologies could therefore become a first step in the development of care for women, particularly by removing the "shameful" nature of the symptoms.

Management of obstetrical injuries to the anal sphincter: A survey of French current practice and perceptions according to the specialties

AIM OF THE STUDY

To conduct a survey of current practice in the management of obstetrical anal sphincter injuries (OASI) and to compare short, medium and long-term practices according to the specialty of the surgeon.

PATIENTS AND METHODS

A 50-item questionnaire was addressed by mail to various specialists via the national learned societies. The questionnaire was addressed only to practitioners who currently managed OASI in their practice.

RESULTS

Of the 135 healthcare professionals who responded, 57 were sub-specialists in ano-rectal surgery (42.2%) and 78 were obstetrical or gynecological specialists (OB-GYN) (57.8%). Management in the acute period after OASI was similar among the specialties and 50% of the practitioners did not perform suture repair of the internal sphincter. Furthermore, few gynecological specialists recommended systematic consultation with an ano-rectal specialist during acute management. In the medium term, ano-rectal specialists were more likely to explore gastro-intestinal symptoms, either clinically or through para-clinical studies. However, these studies did not systematically lead to interventional management in the absence of consensus, particularly for medium-term sphincter repair. In addition, 25% of practitioners recommended that patients undergo systematic delivery by caesarean section for further pregnancies after OASI. In the long term (>12 months), there were substantial differences in management of OASI not only between specialties but also within the same specialty.

CONCLUSION

The various specialists should coordinate to propose multidisciplinary recommendations on the management of OASI.