Consistently inconsistent, the posterior vaginal wall

Transvaginal repair of rectocele for obstructed defecation syndrome: a case report

Rectocele (RC), defined as the protrusion of the anterior rectal wall into the vaginal lumen, is a significant cause of obstructed defecation syndrome (ODS). This case report describes a 60-year-old female patient with chronic constipation diagnosed with Grade III RC-induced ODS after excluding organic bowel diseases and slow-transit constipation. The patient underwent transvaginal repair of the RC, resulting in significant clinical improvement. Combined with a review of the literature, this article discusses the diagnostic criteria, surgical indications, and treatment strategies for RC, providing valuable insights for clinical practice.

Hiatus and pelvic floor failure patterns in pelvic organ prolapse: a 3D MRI study of structural interactions using a level III conceptual model

BACKGROUND

A large urogenital hiatus in level III results in a higher risk of developing pelvic organ prolapse after birth and failure after prolapse surgery. Deepening of the pelvic floor and downward rotation of the levator plate have also been linked to prolapse. Currently we lack data that evaluates how these measures relate to one another and to prolapse occurrence and size.

OBJECTIVE

This study uses measurements from a published conceptual model to compare women with and without prolapse to determine the magnitude of difference between cases and controls and to quantify the interrelationships among different aspects of pelvic floor shape and structure.

STUDY DESIGN

Ninety-one women with anterior predominant prolapse and uterus in situ who had 3D MRI and 30 similar women with normal support were studied. Resting scans were used to avoid the influence of the prolapse dilating the hiatus. Measurements assessed 3 domains: hiatus size (urogenital and levator hiatus); length of the surrounding pelvic floor muscles (pubovisceral, puborectal, iliococcygeal muscles); the shelf-like posterior pelvic floor (levator plate shape, levator bowl volume), and bony pelvic dimensions. Effect sizes were calculated and principal component shape analysis performed to evaluate levator plate shape. z scores were calculated and a value greater than 1.68 (95th percentile) was considered the "failure" criterion. Frequency and severity of structural support site failure were analyzed by prolapse size.

RESULTS

Resting urogenital and levator hiatal areas were 68% and 59% larger in the prolapse group compared to controls. These area enlargements were 2 to 4 times larger than the anterior-posterior dimension enlargements (urogenital hiatus 36%; levator hiatus 13%). The greatest muscle length differences between groups occurred in the pubovisceral (34%) and puborectal (25%) muscles compared to the iliococcygeal muscle (8%)-roughly half the area differences. Levator bowl volume was 63% deeper with prolapse. Urogenital hiatus and levator hiatus areas were strongly correlated with pubovisceral and puborectal muscle length (0.7-0.8), while iliococcygeal muscle length had lower correlations (0.4-0.5). Levator bowl volume correlated strongly with hiatal enlargement (0.7-0.8) and muscle length (pubovisceral and puborectal muscles), moderately so with levator plate and iliococcygeal muscle, and weakly with bony dimension. Failure frequency increased with prolapse size for urogenital hiatus anterior-posterior (P=.001) and area (P=.019). By contrast, levator hiatus area was similar for all prolapse sizes (P=.288), while levator hiatus anterior-posterior failure was more common in larger prolapses (P=.018) but with smaller percentages of failure than levator hiatus area (P<.01). Both levator bowl volume (P=.015) and levator plate (P=.045) trended toward increasing failure with larger prolapse sizes. Among women with enlarged urogenital hiatus at straining, 43% and 28% had normal urogenital hiatus anterior-posterior and area at rest, respectively.

CONCLUSION

Changes in the shape and dimensions of the pelvic floor are complex and are not captured by a single measure (such as the urogenital hiatus anterior-posterior dimension, which does not capture its lateral expansion). The failure patterns were different between small and large prolapses. Understanding why could lead to improved prevention and treatments for level III failures.

Functional Anatomy of Urogenital Hiatus Closure: the Perineal Complex Triad Hypothesis

INTRODUCTION

Urogenital hiatus enlargement is a critical factor associated with prolapse and operative failure. This study of the perineal complex was performed to understand how interactions among its three structures: the levator ani, perineal membrane, and perineal body-united by the vaginal fascia-work to maintain urogenital hiatus closure.

METHODS

Magnetic resonance images from 30 healthy nulliparous women with 3D reconstruction of selected subjects were used to establish overall geometry. Connection points and lines of action were based on perineal dissection in 10 female cadavers (aged 22-86 years), cross sections of 4 female cadavers (aged 14-35 years), and histological sections (cadavers aged 16 and 21 years).

RESULTS

The perineal membrane originates laterally from the ventral two thirds of the ischiopubic rami and attaches medially to the perineal body and vaginal wall. The levator ani attaches to the perineal membrane's cranial surface, vaginal fascia, and the perineal body. The levator line of action in 3D reconstruction is oriented so that the levator pulls the medial perineal membrane cranio-ventrally. In cadavers, simulated levator contraction and relaxation along this vector changes the length of the membrane and the antero-posterior diameter of the urogenital hiatus. Loss of the connection of the left and right perineal membranes through the perineal body results in diastasis of the levator and a widened hiatus, as well as a downward rotation of the perineal membrane.

CONCLUSION

Interconnections involving the levator ani muscles, perineal membrane, perineal body, and vaginal fascia form the perineal complex surrounding the urogenital hiatus in an arrangement that maintains hiatal closure.

Rectoceles: Is There a Correlation Between Presence of Vaginal Prolapse and Radiographic Findings in Symptomatic Women?

BACKGROUND

Constipation is highly prevalent. Women with constipation are evaluated for the presence of vaginal prolapse that may contribute to obstructed defecation syndrome. Defecography can identify anatomic causes of obstructed defecation syndrome (rectocele, intussusception, and enterocele).

OBJECTIVE

This study aimed to assess the characteristics of women with obstructed defecation syndrome and radiographic rectoceles with and without posterior vaginal wall prolapse and to characterize the relationship between anatomical abnormalities and dysfunction.

DESIGN

This is a retrospective case-control study of women with obstructed defecation syndrome who had radiographic rectoceles on defecography.

SETTINGS

Women who presented to a Pelvic Floor Disorders Center were included.

PATIENTS

Cases were defined as constipated women with radiographic rectoceles and at least stage II posterior vaginal wall prolapse on examination. Controls were patients with radiographic rectoceles but without posterior vaginal wall prolapse on examination.

MAIN OUTCOME MEASURES

Patient characteristics, anorectal testing results, and validated questionnaires were compared between groups.

RESULTS

A total of 106 women met inclusion criteria. Women with posterior vaginal wall prolapse (48 (45.3%)) had larger rectoceles on defecography than women without it on examination (3.4 cm vs 3.0 cm, p < 0.01). Women with posterior vaginal wall prolapse on examination were more likely to splint during defecation than women without vaginal wall prolapse (63.8% vs 27.3%, p < 0.01). All other defecatory symptoms, anorectal manometry parameters, and questionnaire responses were similar between groups.

LIMITATIONS

This study was limited by its retrospective study design. Our data were taken from a single institution within a center specializing in the treatment of pelvic floor disorders, potentially limiting generalizability.

CONCLUSIONS

Patients with constipation, radiographic rectoceles, and vaginal prolapse may differ from those without evidence of prolapse. Patients with vaginal prolapse were more likely to splint to aide evacuation and demonstrated larger rectoceles on defecography. Further studies are needed to determine whether constipation causes progression along this continuum or whether progression of prolapse is a cause of worsening defecatory dysfunction. See Video Abstract at http://links.lww.com/DCR/B626.

RECTOCELES EXISTE UNA CORRELACIN ENTRE LA PRESENCIA DE PROLAPSO VAGINAL Y LOS HALLAZGOS RADIOLGICOS EN MUJERES SINTOMTICAS

ANTECEDENTES:El estreñimiento es una enfermedad muy prevalente. Las mujeres con estreñimiento se evalúan para detectar la presencia de prolapso vaginal que pueda contribuir al síndrome de defecación obstructiva. La defecografía puede identificar las causas anatómicas del síndrome de defecación obstructiva (rectocele, invaginación intestinal (intususcepción) y enterocele).OBJETIVO:Este estudio tiene como objetivo evaluar las características de las mujeres con síndrome de defecación obstructiva y la presencia de rectocele como hallazgo radiológico, con y sin prolapso de la pared vaginal posterior, y caracterizar la relación entre las anomalías anatómicas y la presencia de disfunción.DISEÑO:Este es un estudio retrospectivo de casos y controles, de mujeres con síndrome de defecación obstructiva, que tenían rectocele como hallazgo radiológico en una defecografía.MARCO:Mujeres que acudieron a un Centro de Trastornos del Piso Pélvico.PACIENTES:Los casos fueron definidos como mujeres con estreñimiento con hallazgos radiológicos de rectocele, con al menos un prolapso estadio II de la pared vaginal posterio, en el examen físico. Los controles fueron pacientes con solo rectocele por hallazgos radiológicos, sin prolapso de la pared vaginal posterior en el examen físico.PRINCIPALES MEDIDAS DE RESULTADO:Se compararon entre los grupos: las características de las pacientes, los resultados de las pruebas diagnósticas anorrectales y los cuestionarios validados.RESULTADOS:Un total de 106 mujeres cumplieron los criterios de inclusión. Las mujeres con prolapso de la pared vaginal posterior 48 (45,3%) tenían rectoceles de mayor tamaño en la defecografía en comparación con las mujeres sin rectocele en el examen físico (3,4 cm versus 3,0 cm, p <0,01). Las mujeres con prolapso de la pared vaginal posterior en el examen, tenían una mayor probabilidad de que les fuera necesario ejercer una maniobra de presión manual o digital del periné durante la defecación, comparado con las mujeres sin rectocele clínico (63,8% versus 27,3%, p <0,01). Todos los demás síntomas defecatorios, los parámetros de la manometría anorrectal, y las respuestas al cuestionario fueron similares entre los grupos.LIMITACIONES:Estudio retrospectivo. Los datos fueron obtenidos de la base de datos de un centro especializado en el tratamiento de los trastornos del piso pélvico lo que potencialmente limita generalizar.CONCLUSIONES:Las pacientes con estreñimiento, rectocele como hallazgo radiológico, y prolapso vaginal pueden ser diferentes de aquellas sin evidencia de prolapso. Las pacientes con prolapso vaginal, tenían una mayor probabilidad de que les fuera necesario ejercer maniobras manuales o digitales de presión a nivel del periné para ayudar a la evacuación, y tenían rectoceles de mayor tamaño en la defecografía. Se necesitan más estudios para determinar si el estreñimiento causa que el rectocele aumente progresivamente de tamaño, empeorando la disfunción defecatoria. Consulte Video Resumen en http://links.lww.com/DCR/B626.

Structural failure sites in posterior vaginal wall prolapse: stress 3D MRI-based analysis

INTRODUCTION AND HYPOTHESIS

The objective was to identify structural failure sites in rectocele by comparing women with and those without posterior vaginal wall prolapse and accessing their relative contribution to rectocele size based on stress MRI-based measurements.

METHODS

We studied three-dimensional stress MRI at maximal Valsalva of 25 women with (cases) and 25 without (controls) posterior vaginal prolapse of similar age and parity. Vaginal wall factors (posterior wall length and width); attachment factors (paravaginal posterior wall location, posterior fornix height, and perineal height); and hiatal factors (hiatal size and levator ani defects) were measured using Slicer 4.3.0® and a custom Python program. Stepwise linear regression was used to assess the relative contribution of all factors to the posterior prolapse size.

RESULTS

We identified three primary factors with large effect sizes of 2 or greater: two attachment factors-posterior paravaginal descent and perineal height; and one hiatal factor-genital hiatus size. These were the strongest predictors of the presence and size of rectocele, the most common failure sites, found in 60-76% of cases; and highly correlated with one another (r = 0.72-0.84, p < .001). Longer vaginal length, wider distal vagina, lower posterior fornix, and larger levator ani hiatus had smaller effect sizes and were less likely to fall outside the norm (20-24%) than the three primary factors. When considering all the supporting factors, the combination of perineal height, posterior fornix height, and vaginal length explained 73% of the variation in rectocele size.

CONCLUSIONS

Lower perineal and lateral posterior vaginal location and enlarged genital hiatus size were strong predictors of rectocele occurrence and size and correlated highly.

The relationship of defecation symptoms and posterior vaginal wall prolapse in women undergoing pelvic organ prolapse surgery

BACKGROUND

Defecation symptoms are common among women with pelvic organ prolapse. However, the relationship between posterior vaginal wall prolapse and defecation symptoms remains debatable. Even though there is a plausible biomechanical rationale for posterior wall prolapse to cause obstructed defecation, previous studies have drawn contradictory conclusions regarding the association.

OBJECTIVE

We aimed to examine the association between posterior vaginal wall prolapse and defecation symptoms by assessing the following: (1) does prevalence of defecation symptoms increase along with posterior wall prolapse severity, (2) is postoperative symptom improvement greater in women who underwent posterior compartment procedures in comparison with those who did not, and (3) is symptom improvement related to the symptom's correlation with the degree of prolapse?

STUDY DESIGN

We used data from a nationwide longitudinal cohort study with 3515 women undergoing pelvic organ prolapse surgery. We measured the prevalence of 9 defecation symptoms at baseline and at 6 and 24 months after surgery using the short form of the Pelvic Floor Distress Inventory. Baseline degree of prolapse was categorized in stages as defined by the Pelvic Organ Prolapse Quantification System. The relationship between the degree of posterior wall prolapse and prevalence of bothersome defecation symptoms was studied with logistic regression and adjusted for patient characteristics and severity of anterior wall and apical prolapse. Generalized estimating equations were used to assess the longitudinal change in symptom prevalence in groups of participants with and without repair for posterior vaginal compartment. Correlations between symptom improvement and symptom dependency on the degree of prolapse was assessed by calculating Pearson's correlation coefficient.

RESULTS

The stage of posterior wall prolapse (stage 2 vs stage 0) correlated with splinting, straining, incomplete evacuation, fecal incontinence of liquid stool, pain during defecation, fecal urgency, and anorectal prolapse (adjusted odds ratios, 2.7, 2.1, 2.0, 1.5, 2.1, 1.4, and 2.2, respectively; P ≤ .007 for all). Flatal incontinence and fecal incontinence of solid stool were not associated with the severity of posterior vaginal wall prolapse. Obstructed defecation symptoms (splinting, straining, and incomplete evacuation) improved more in women undergoing posterior compartment surgery compared with women undergoing repair for other compartments. The greatest improvement at follow-up was observed for those symptoms that showed strongest association with the degree of prolapse at baseline.

CONCLUSION

Obstructed defecation symptoms are dependent on the posterior wall anatomy. Women presenting with posterior wall prolapse, and these symptoms can expect to improve after surgery. Other defecation symptoms also improve after pelvic organ prolapse surgery, but they are not as specific to posterior wall anatomy as obstructed defecation symptoms.

Comparison of measurement systems for posterior vaginal wall prolapse on magnetic resonance imaging

INTRODUCTION AND HYPOTHESIS

A wide variety of reference lines and landmarks have been used in imaging studies to diagnose and quantify posterior vaginal wall prolapse without consensus. We sought to determine which is the best system to (1) identify posterior vaginal wall prolapse and its appropriate cutoff values and (2) assess the prolapse size.

METHODS

This was a secondary analysis of sagittal maximal Valsalva dynamic MRI scans from 52 posterior-predominant prolapse cases and 60 comparable controls from ongoing research. All eight existing measurement lines and a new parameter, the exposed vaginal length, were measured. Expert opinions were used to score the prolapse sizes. Simple linear regressions, effect sizes, area under the curve, and classification and regression tree analyses were used to compare these reference systems and determine cutoff values. Linear and ordinal logistic regressions were used to assess the effectiveness of the prolapse size.

RESULTS

Among existing parameters, "the perineal line-internal pubis," a reference line from the inside of the pubic symphysis to the front tip of the perineal body (cutoff value 0.9 cm), had the largest effect size (1.61), showed the highest sensitivity and specificity to discriminate prolapse with area under the curve (0.91), and explained the most variation (68%) in prolapse size scores. The exposed vaginal length (cutoff value 2.9) outperformed all the existing lines, with the largest effect size (2.09), area under the curve (0.95), and R-squared value (0.77).

CONCLUSIONS

The exposed vaginal length performs slightly better than the best of the existing systems, for both diagnosing and quantifying posterior prolapse size. Performance characteristics and evidence-based cutoffs might be useful in clinical practice.

Women's experiences of managing digitation: do we ask enough in primary care?

The aim of this paper was to consider the available evidence for the current management of pelvic organ prolapse, which is a common presentation in primary care. However, not all women will present, only presenting when symptoms become bothersome. Particular attention was paid to understanding the problem of rectocele and its influence on obstructive defaecation symptoms. The burden of rectocele and its consequences are not truly known. Furthermore, healthcare professionals may not always enquire about bowel symptoms and patients may not disclose them. Complex emotions around coping and managing stress add to the challenges with seeking healthcare. Therefore, the impact on the lived experience of women who have difficulty with rectal emptying can be significant. The review identified a dearth of knowledge about women living with the problem of obstructive defaecation resulting in the use of digitation. Improving the management of digitation, an under-reported problem, is necessary to improve the quality of life for women. Primary care needs to increase access to conservative measures for women struggling with bothersome symptoms, such as constipation, the need to digitate or anxiety.

Structural, functional, and symptomatic differences between women with rectocele versus cystocele and normal support

BACKGROUND

Prolapse of the anterior and posterior vaginal walls has been generally associated with apical descent and levator ani muscle defects. However, the relative contributions of these factors to the pathophysiology of descent in the different vaginal compartments is not well understood. Furthermore, symptoms uniquely associated with prolapse in these compartments have not been well characterized.

OBJECTIVES

The objectives of the study were to compare the associations between the following: (1) apical support, (2) levator ani muscles, and (3) pelvic floor symptoms in women with posterior-predominant prolapse, anterior-predominant prolapse, and normal support.

STUDY DESIGN

This is a cross-sectional study with 2 case arms: 60 women with posterior prolapse, 90 with anterior prolapse, and a referent control arm with 103 asymptomatic subjects with normal support, determined from pelvic organ prolapse quantification examinations. Levator muscle defects were graded from magnetic resonance imaging. Vaginal closure forces above resting were measured with an instrumented speculum during maximal contraction. Pelvic floor symptoms were measured via the Pelvic Floor Distress Inventory-Short Form.

RESULTS

Mean point C location in controls was -6.9 cm [1.5] (mean [standard deviation]); and was higher in posterior prolapse (-4.7 cm [2.7], 2.2 cm below controls) than the anterior prolapse group (-1.2 cm [4.1]; 5.6 cm below controls, P < .001 for all comparisons). Normal-appearing muscles (ie, muscle without a visible defect) occurred at similar frequencies in posterior prolapse (45%) and controls (51%, P = .43) but less often in anterior prolapse (28%, P ≤ .03 for pairwise comparisons). Major levator ani defects occurred at similar rates in women with posterior (33%) and anterior prolapse (42%, P = .27) but less often in controls (16%, P ≤ .012 for both pairwise comparisons). Similarly, there were significant differences in generated vaginal closure forces across the 3 groups, with the prolapse groups generating weaker closure forces than the control group (P = .004), but the differences between the 2 prolapse groups were not significant after controlling for prolapse size (P = .43). Pelvic floor symptoms were more severe for the posterior (mean Pelvic Floor Distress Inventory score, 129) and anterior prolapse groups (score, 128) than the controls (score, 40.2, P < .001 for both comparisons); the difference between the 2 prolapse groups was not significant (P = .83).

CONCLUSION

Posterior-predominant prolapse involves an almost 3-fold less apical descent below normal than anterior-predominant vaginal prolapse. Levator ani defects and muscle impairment also have a lower impact. Pelvic floor symptoms reflect the presence and size of prolapse more than the predominant lax vaginal compartment.

Temporal relationship between posterior vaginal prolapse and defecatory symptoms

BACKGROUND

Posterior vaginal prolapse is thought to cause difficult defecation and splinting for bowel movements. However, the temporal relationship between difficult defecation and prolapse is unknown. Does posterior vaginal prolapse lead to the development of defecation symptoms? Conversely, does difficult defecation lead to posterior prolapse? This prospective longitudinal study offered an opportunity to study these unanswered questions.

OBJECTIVE

We sought to investigate the following questions: (1) Are symptoms of difficult defecation more likely to develop (and less likely to resolve) among women with posterior vaginal prolapse? (2) Is posterior vaginal prolapse more likely to develop among women who complain of difficult defecation?

STUDY DESIGN

In this longitudinal study, parous women were assessed annually for defecatory symptoms (Epidemiology of Prolapse and Incontinence Questionnaire) and pelvic organ support (POP-Q examination). The unit of analysis for this study was a visit-pair (2 sequential visits from any participant). We created logistic regression models for symptom onset among those women who were symptom-free at the index visit and for symptom resolution among those women who had symptoms at the index visit. To investigate the change in posterior vaginal support (assessed at point Bp) as a function of symptom status, we created a standard regression model that controlled for Bp at the index visit for each visit-pair.

RESULTS

We derived 3888 visit-pairs from 1223 women (each completed 2-7 annual visits). At the index visit, 1143 women (29%) reported difficulty with bowel movements, and 643 women (17%) reported splinting for bowel movements. Posterior vaginal prolapse (Bp≥0) was observed among 80 women (2%). Among those women without symptoms, posterior vaginal prolapse did not significantly increase the odds that defecatory symptoms would develop (difficult bowel movements, P=.378; splinting, P=.765). In contrast, among those with defecatory symptoms, posterior vaginal prolapse reduced the probability of symptom resolution (difficult bowel movements, P<.001; splinting, P=.162). The mean rate of change in posterior wall support was +0.13 cm. Among women without posterior vaginal prolapse, the presence of defecatory symptoms at the index visit did not have an effect on changes in Bp over time; however, among those with posterior vaginal prolapse (Bp≥0), defecatory symptoms were associated with more rapid worsening of posterior support (difficulty with bowel movements, P=.005; splinting, P=.057).

CONCLUSION

Posterior vaginal prolapse did not increase the odds that new defecatory symptoms would develop among asymptomatic women but did increase the probability that defecatory symptoms would persist over time. Furthermore, among those women with established posterior vaginal prolapse, defecatory symptoms were associated with more rapid worsening of posterior vaginal wall descent.

Current Trends in Management of Defecatory Dysfunction, Posterior Compartment Prolapse, and Fecal Incontinence

While it would be our hope to report that there have been significant gains in the understanding of the correlation between the posterior vaginal compartment and defecatory dysfunction in the last year, this is not the case. Instead, we review the highlights of management of posterior vaginal compartment and defecatory dysfunction including 1) defining and understanding the patient's symptoms; 2) considering systemic disorders, motility dysfunction, and mechanical causes that may be contributing; 3) encouraging conservative management as first-line therapy; and 4) recognizing which surgical options are likely to improve specific symptoms. This is then followed by an update on treatment options for fecal incontinence, which we now prefer to refer to as accidental bowel leakage. We are able to report on five exciting and innovative treatment approaches for accidental bowel leakage. As the scientific community increases focus on patient-centered outcomes, we are likely on the verge of having a greater understanding of how treatment options for posterior compartment prolapse and defecatory dysfunction can improve patient symptoms. This year, we can report that strong evidence based recommendations simply do not exist, and this area is ripe for future investigation.