Long-term function and morphology of the anal sphincters and the pelvic floor after primary repair of obstetric anal sphincter injury

3T external phased-array magnetic resonance imaging in detection of obstetric anal sphincter lesions: a pilot study

BACKGROUND

Three-dimensional endoanal ultrasound (3D EAUS) has been the gold standard for detecting anal sphincter lesions in patients with a history of obstetric anal sphincter injury (OASI). Advances in imaging technologies have facilitated the detection of these lesions with external phased-array magnetic resonance imaging (MRI), which could offer an alternative imaging modality for the diagnosis of residual OASI (ROASI) in centers where 3D EAUS imaging is not available.

PURPOSE

To compare two diagnostic modalities: the 3D EAUS and 3T external phased-array MRI in the detection of residual anal sphincter lesions.

MATERIAL AND METHODS

A total of 24 women with a history of OASI were imaged with both 3D EAUS and 3T external phased-array MRI after primary repair of the injury. Intraclass correlation (ICC) and interrater reliability (IRR) values were calculated for the grade and circumference of the sphincter lesion. Sphincter lesions were graded according to the Sultan classification.

RESULTS

There was an almost perfect agreement between 3D EAUS and 3T external phased-array MRI in determining the extent of the sphincter lesions according to the Sultan classification (κ = 0.881; P < 0.001) and the circumference of the external anal sphincter defects, measured in degrees (κ = 0.896; P < 0.001).

CONCLUSION

The results of this study indicate that 3T external phased-array MRI and 3D EAUS yield comparable results in the diagnosis of ROASI. These findings suggest that 3T external phased-array MRI could serve as an alternative diagnostic modality to 3D EAUS in the diagnosis of ROASI.

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.

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.

Japanese Practice Guidelines for Fecal Incontinence Part 2-Examination and Conservative Treatment for Fecal Incontinence- English Version

Examination for fecal incontinence is performed in order to evaluate the condition of each patient. As there is no single method that perfectly assesses this condition, there are several tests that need to be conducted. These are as follows: anal manometry, recto anal sensitivity test, pudendal nerve terminal motor latency, electromyogram, anal endosonography, pelvic magnetic resonance imaging (MRI) scan, and defecography. In addition, the mental and physical stress most patients experience during all these examinations needs to be taken into consideration. Although some of these examinations mostly apply for patients with constipation, we hereby describe these tests as tools for the assessment of fecal incontinence. Conservative therapies for fecal incontinence include diet, lifestyle, and bowel habit modification, pharmacotherapy, pelvic floor muscle training, biofeedback therapy, anal insert device, trans anal irrigation, and so on. These interventions have been identified to improve the symptoms of fecal incontinence by determining the mechanisms resulting in firmer stool consistency; strengthening the pelvic floor muscles, including the external anal sphincter; normalizing the rectal sensation; or periodic emptying of the colon and rectum. Among these interventions, diet, lifestyle, and bowel habit modifications and pharmacotherapy can be performed with some degree of knowledge and experience. These two therapies, therefore, can be conducted by all physicians, including general practitioners and other physicians not specializing in fecal incontinence. However, patients with fecal incontinence who did not improve following these initial therapies should be referred to specialized institutions. Contrary to the initial therapies, specialized therapies, including pelvic floor muscle training, biofeedback therapy, anal insert device, and trans anal irrigation, should be conducted in specialized institutions as these require patient education and instructions based on expert knowledge and experience. In general, conservative therapies should be performed for fecal incontinence before surgery because its pathophysiologies are mostly attributed to benign conditions. All Japanese healthcare professionals who take care of patients with fecal incontinence are expected to understand the characteristics of each conservative therapy, so that appropriate therapies will be selected and performed. Therefore, in this chapter, the characteristics of each conservative therapy for fecal incontinence are described.

Quality of life and 3D-EUS assessment for anal incontinence after childbirth

BACKGROUND

the incidence of obstetric sphincter tears has risen to 15-30% and the prevalence of anal incontinence (AI) symptoms after childbirth may be as high as 40%. The present study evaluates the correlation between obstetric injuries detected by endoanal ultrasound (3D-EUS) and AI symptoms, as well as their impact on the quality of life (QOL) of women after childbirth.

METHODS

a prospective observational study was performed of pregnant women evaluated before (baseline) and three months after childbirth to ensure the integrity of the anal sphincters and to evaluate possible injuries. The Fecal Incontinence Quality of Life (FIQL) questionnaire and the Cleveland Clinic Score of Incontinence (Wexner) were completed before and after childbirth. The questionnaire results were correlated with an assessment of sphincter defects performed by 3D-EUS.

RESULTS

a total of 56 females were included in the study. Overall, 48% developed symptoms of AI after childbirth, with a significant decrease in their FIQL compared to the initial evaluation, 3.9 (0.05) vs 3.4 (0.8), respectively (p = 0.000). In addition, 42% of the cohort presented with some kind of obstetric sphincter defect on the 3D-EUS. Instrumental assisted delivery and the sphincter defects were the only two significant factors identified via multivariate analysis that were associated with a decrease in QOL (0.4, 95% CI, 0.07-0.8).

CONCLUSIONS

AI after childbirth was associated with a huge impact on QOL, especially in patients with sphincter injuries. A complete clinical evaluation, including 3D-EUS, is recommended to prevent, manage or treat AI in primiparous females.

Is endoanal, introital or transperineal ultrasound diagnosis of sphincter defects more strongly associated with anal incontinence?

INTRODUCTION AND HYPOTHESIS

Our aim was to explore the association between anal incontinence (AI) and persistent anal sphincter defects diagnosed with 3D endoanal (EAUS), introital (IUS) and transperineal ultrasound (TPUS) in women after obstetric anal sphincter injury (OASI) and study the association between sphincter defects and anal pressure.

METHODS

We carried out a cross-sectional study of 250 women with OASI recruited during the period 2013-2015. They were examined 6-12 weeks postpartum or in a subsequent pregnancy with 3D EAUS, IUS and TPUS and measurement of anal pressure. Prevalence of urgency/solid/liquid AI or flatal AI and anal pressure were compared in women with a defect and those with an intact sphincter (diagnosed off-line) using Chi-squared and Mann-Whitney U test.

RESULTS

At a mean of 23.6 (SD 30.1) months after OASI, more women with defect than those with intact sphincters on EAUS had AI; urgency/solid/liquid AI vs external defect: 36% vs 13% and flatal AI vs internal defect: 27% vs 13%, p < 0.05. On TPUS, more women with defect sphincters had flatal AI: 32% vs 13%, p = 0.03. No difference was found on IUS. Difference between defect and intact sphincters on EAUS, IUS and TPUS respectively was found for mean [SD] maximum anal resting pressure (48 [13] vs 55 [14] mmHg; 48 [12] vs 56 [13] mmHg; 50 [13] vs 54 [14] mmHg) and squeeze incremental pressure (33 [17] vs 49 [28] mmHg; 37 [23] vs 50 [28] mmHg; 36 [18] vs 50 [30] mmHg; p < 0.01).

CONCLUSIONS

Endoanal ultrasound had the strongest association with AI symptoms 2 years after OASI. Sphincter defects detected using all ultrasound methods were associated with lower anal pressure.

The Role of Three-Dimensional Endoanal Ultrasound on Diagnosis and Classification of Sphincter Defects After Childbirth

BACKGROUND

Diagnostic tests for fecal incontinence have been improved over time. This study aims to evaluate the role of Three-dimensional endoanal ultrasound (3D-EUS) and the Starck's score in the assessment and treatment of obstetric sphincter injuries.

METHODS

A prospective observational study was performed including primiparous women who were evaluated at 20 wk of pregnancy and 3 mo after childbirth. Sphincter defects were classified according to the Starck's and Obstetrical Anal Sphincter Injuries classifications. Patients also completed the Fecal Incontinence Quality of Life and the Wexner questionnaires before and after childbirth.

RESULTS

Sphincter defects were detected in 45% of the 56 women included, although 85% had an uneventful delivery. Most defects were found isolated to the external anal sphincter except for two cases, classified by a Starck's score >8. Fecal Incontinence Quality of Life and Wexner questionnaires showed a rate of symptomatic patients of around 46%. We observed that 30% of patients with sphincter injuries remained asymptomatic.

CONCLUSIONS

The 3D-EUS is a useful test in assessing sphincter defects after childbirth. This method makes it possible to detect small sphincter defects that otherwise would have gone unnoticed, as 30% of patients with sphincter injuries were asymptomatic. In addition, both the 3D-EUS and the Starck's score were valuable in establishing an algorithm for the treatment of obstetric sphincter injuries.

Comparison of 3D endoanal ultrasound and external phased array magnetic resonance imaging in the diagnosis of obstetric anal sphincter injuries

Objectives

The gold standard of postpartum anal sphincter imaging has been the 3D endoanal ultrasound (EAUS). Development of magnetic resonance imaging (MRI) has allowed anal sphincter evaluation without the use of endoanal coils. The aim of this study is to compare these two modalities in diagnosing residual sphincter lesions post obstetric anal sphincter injury (OASI).

Methods

Forty women were followed up after primary repair of OASI with both 3D EAUS and external phased array MRI. Details of the anal sphincter injury and sphincter musculature were gathered and analysed.

Results

There was a moderate interrater reliability (κ = 0.510) between the two imaging modalities in detecting sphincter lesions, with more lesions detected by MRI. There was a moderate intraclass correlation (ICC) between the circumference of the tear (κ = 0.506) and a fair ICC between the external anal sphincter thickness measurements at locations 3 and 9 on the proctologic clock face (κ = 0.320) and (κ = 0.336).

Conclusions

The results of our study indicate that the use of external phased array MRI is feasible for detecting obstetric anal sphincter lesions postpartum. This allows for imaging of the sphincter defects in centres where EAUS imaging is not available.

Key Points

• A two centre prospective study that showed external phased array MRI to be a valid imaging modality for diagnosing obstetric anal sphincter injuries.

Electronic supplementary material

The online version of this article (10.1007/s00330-019-06125-8) contains supplementary material, which is available to authorized users.

The relationship between residual sphincter damage after primary repair, faecal incontinence, and anal sphincter function in primiparous women with an obstetric anal sphincter injury

BACKGROUND AND AIMS

Anal sphincter injury has been identified as a primary cause of post-partum fecal incontinence in women with obstetric anal sphincter injury. However, women without obstetric anal sphincter injury may also develop fecal incontinence. The aim is to determine the relationship between fecal incontinence severity; and i) residual anal sphincter injury, quantified by the Starck score, and ii) anal sphincter tone.

METHODS

Consecutive case series of prospectively collected data set in a Pelvic Floor Unit within a tertiary teaching hospital in Australia. Population 181 primiparous women with Sultan classification Grade 3 and 4 sphincter injuries.

MAIN OUTCOME MEASURES

Sultan classification, anal manometry, pudendal nerve terminal motor latency, St Mark's fecal incontinence score, and Starck ultrasound score.

RESULTS

45% of women reported some degree of fecal incontinence. One third of women with normal external sphincter tone were incontinent. Those with higher Starck score had higher St Mark's scores. A higher Sultan classification correlated with more severe incontinence regardless if the repair was complete. Forceps delivery had a twofold risk of incontinence when compared to non-forceps delivery.

CONCLUSION

The importance of an effective anal sphincter repair is confirmed. However, overall there is no direct relationship between residual sphincter damage, anal sphincter tone, and fecal incontinence severity. These data indicate that anal sphincter integrity alone is not the sole mechanism for maintaining fecal continence. Rectal and colonic motor function may also play a role and investigation into these components may provide greater insight into the effect of vaginal delivery upon fecal continence mechanisms.

Structure-function relationship of the human external anal sphincter

INTRODUCTION AND HYPOTHESIS

Obstetrical external anal sphincter (EAS) injury and subsequent dysfunction are leading risk factors for female fecal incontinence (FI). Limited knowledge of the EAS structure-function relationship hinders treatment optimization. We directly measured functionally relevant intrinsic parameters of human EAS and tested whether vaginal delivery alters the EAS structure-function relationship.

METHODS

Major predictors of in vivo EAS function were compared between specimens procured from vaginally nulliparous (VN, n = 5) and vaginally parous (VP, n = 7) cadaveric donors: operational sarcomere length (Ls), which dictates force-length relationship; physiological cross-sectional area (PCSA), which determines isometric force-generating capacity; fiber length (Lfn), responsible for muscle excursion and contractile velocity; and muscle stiffness. Data were analyzed using unpaired and paired t tests, α < 0.05. Results are presented as mean ± SEM.

RESULTS

The VN and VP (median parity 3) groups were similar in age and BMI. No gross anatomical defects were identified. EAS Ls (2.36 ± 0.05 μm) was shorter than the optimal Lso (2.7 μm), at which contractile force is maximal, P = 0.0001. Stiffness was lower at Ls than Lso (5.4 ± 14 kPa/μm vs 35.3 ± 12 kPa/μm, P < 0.0001). This structural design allows active and passive tension to increase with EAS stretching. EAS relatively long Lfn (106 ± 24.8 mm) permits rapid contraction without decreased force, whereas intermediate PCSA (1.3 ± 0.3 cm2) is conducive to maintaining resting tone. All parameters were similar between groups.

CONCLUSIONS

This first direct examination of human EAS underscores how EAS intrinsic design matches its intended function. Knowledge of the EAS structure-function relationship is important for understanding the pathogenesis of FI and the optimization of treatments for EAS dysfunction.

Postpartum two- and three-dimensional ultrasound evaluation of anal sphincter complex in women with obstetric anal sphincter injury

OBJECTIVE

To compare the sensitivity and specificity of two- (2D) and three- (3D) dimensional transperineal ultrasound (TPUS) and 3D endovaginal ultrasound (EVUS) with the gold standard 3D endoanal ultrasound (EAUS) in detecting residual defects after primary repair of obstetric anal sphincter injuries (OASIS).

METHODS

External (EAS) and internal (IAS) anal sphincters were evaluated by the four ultrasound modalities in women with repaired OASIS. 2D-TPUS was evaluated in real-time, whereas 3D-TPUS, 3D-EVUS and 3D-EAUS volumes were evaluated offline by six blinded readers. The presence/absence of any tear in EAS or IAS was recorded and defects were scored according to the Starck system. Sensitivity, specificity and predictive values were calculated, using 3D-EAUS as reference standard. Inter- and intraobserver analyses were performed for all 3D imaging modalities. Association between patients' symptoms (Wexner score) and ultrasound findings (Starck score) was calculated.

RESULTS

Images from 55 patients were analyzed. Compared with findings on 3D-EAUS, the agreement for EAS evaluation was poor for 3D-EVUS (κ = 0.01), fair for 2D-TPUS (κ = 0.30) and good for 3D-TPUS (κ = 0.73). The agreement for IAS evaluation was moderate for both 3D-EVUS (κ = 0.41) and 2D-TPUS (κ = 0.52) and good for 3D-TPUS (κ = 0.66). Good intraobserver (3D-EAUS, κ = 0.73; 3D-TPUS, κ = 0.78) and interobserver (3D-EAUS, κ = 0.68; 3D-TPUS, κ = 0.60) agreement was reported. Significant association between Starck and Wexner scores was found only for 3D-EAUS (Spearman's rho = 0.277, P = 0.04).

CONCLUSIONS

2D-TPUS and 3D-EVUS are not accurate modalities for the assessment of anal sphincters after repair of OASIS. 3D-TPUS shows good agreement with the gold standard 3D-EAUS and a high sensitivity in detecting residual defects. It, thus, has potential as a screening tool after primary repair of OASIS. Copyright © 2016 ISUOG. Published by John Wiley & Sons Ltd.

Evaluation of anatomical and functional results of overlapping anal sphincter repair with or without the injection of bone marrow aspirate concentrate: a case-control study

AIM

Overlapping anal sphincter repair (OASR) is used for treatment of faecal incontinence due to an external anal sphincter (EAS) defect; however, it is not the optimal treatment as its functional results tend to deteriorate significantly with time. The present study aimed to evaluate the effect of local injection of bone marrow aspirate concentrate (BMAC) on the outcome of OASR.

METHOD

We compared a prospective group of 20 patients with EAS defect who were managed with OASR and BMAC injection (group I) with a historical control group of an equal number of patients managed with OASR alone (group II). Patients were assessed preoperatively and during follow-up by the Wexner continence score and endoanal ultrasound. The primary end-points were the improvement of the continence level measured by the Wexner score and the residual EAS defect size measured by endoanal ultrasound.

RESULTS

At the end of follow-up, group I had significantly lower mean postoperative Wexner score (5.4 ± 7.6 vs 10.6 ± 7.4; P = 0.03) and smaller EAS defect percentage (12.2 ± 17.5 vs 18.3 ± 18.9). These findings were statistically significant in patients with a small preoperative EAS defect equal to or less than one-third of the anal circumference. Patients with larger preoperative EAS did not show a significant improvement of the continence level after repair in either group.

CONCLUSION

Augmenting OASR with local injection of BMAC in patients with faecal incontinence caused by an EAS defect, particularly a smaller defect, can improve both functional and anatomical outcomes of OASR.

Evaluation of postoperative anal functions using endoanal ultrasonography and anorectal manometry in children with congenital anorectal malformations

PURPOSE

The aim of this study was to assess the postoperative anorectal anatomy and function in children with congenital anorectal malformations (ARM) using endoanal ultrasonography (EUS) and anorectal manometry.

METHODS

This study included 47 children who had undergone posterior sagittal anorectoplasty (PSARP) or transperineal anorectoplasty for the repair of an ARM. Children were grouped according to symptoms of defecation disorder, including normal defecation, fecal soiling, fecal incontinence, and constipation. Ten children with no history of anal or rectal diseases served as healthy controls. A well-established scoring system was used for the evaluation of anal function and defecation disorder.

RESULTS

EUS showed significant differences in the thickness of the interior sphincter between the ARM patients and the healthy controls (P<0.05). However, no significant difference was found in the thickness of the interior sphincters between the PSARP group and transperineal anorectoplasty group (P>0.05). Anorectal manometry showed that the balloon volumes were significantly different between the surgical group and the control group (P<0.01), and between the low defect group and the intermediate-high defect group (P=0.022). Balloon volume was significantly correlated with anal function scores (r=-0.30, P<0.05).

CONCLUSIONS

EUS and anorectal manometry can provide objective assessment of postoperative anorectal anatomy and function in children with ARM.