Are complications of stress urinary incontinence surgery procedures associated with the position of the sling?

Sonographic Sling Position and the Outcome of the Tension-Free Vaginal Tape-Obturator in Asian Chinese

INTRODUCTION AND HYPOTHESIS

The objective was to assess the sonographic tension-free vaginal tape-obturator (TVT-O) position and the outcome in Asian Chinese women.

METHODS

A prospective cohort study of 254 patients who underwent TVT-O surgery between 2013 and 2022. The sonographic position of the TVT-O was recorded and correlated with the outcomes, including the subjective cure rates, Incontinence Impact Questionnaire 7 (IIQ-7), and retention of urine.

RESULTS

A total of 92.9% reported no stress urinary incontinence after the operation. The IIQ-7 score significantly improved after TVT-O surgery. 88.2% of patients had the TVT-O placed at 50-70% of the urethral length and half of the TVT-O were placed 3-5 mm from the urethra. The cure rate was higher when the tape was in the middle third of the urethra, but the tape position was not associated with postoperative retention of urine in our study.

CONCLUSIONS

Most TVT-Os can be placed in the target zone in a blind procedure in Asian Chinese women. The tape position was related to the outcomes. Early postoperative ultrasound of the tape position may predict the outcome of the surgery.

Sonography as a Diagnostic Tool in Midurethral Sling Complications: A Narrative Review

Despite the established safety and efficacy of midurethral slings (MUS), which are the current gold standard treatment for stress urinary incontinence (SUI), the potential for postoperative complications remains a significant concern for both healthcare professionals and patients. Meanwhile, sonography has emerged as a significant diagnostic tool in urogynecology, and one of the applications of this imaging modality may be the evaluation of complications arising from MUS procedures. This review, based on a comprehensive literature search, focuses on the use of pelvic floor ultrasound (US) in the context of MUS complications. It includes analyses of randomized controlled trials, prospective, and retrospective studies, covering preoperative and postoperative investigations, to assess complications such as persistent and recurrent SUI, urinary retention and obstructive voiding, de novo urgency/overactive bladder, vaginal exposure, sling erosion, pain, and hematoma. The review critically examines the existing literature, with a particular focus on recent publications. Despite the variability in findings, it appears that for each of the discussed complications, the application of pelvic floor US can significantly support the diagnostic and therapeutic process. The paper also identifies potential future directions for the development of US applications in diagnosing MUS complications.

Midurethral sling position and surgical outcome: A meta-analysis

There is still ongoing debate as to whether the outcome of the sling is determined by the position of the midurethral sling. In order to evaluate the potential impact of sling position on the outcomes of retropubic and transobturator sling procedures for stress urinary incontinence, it is necessary to conduct further investigations. We conducted a comprehensive search across various electronic databases such as PubMed, EMBASE, MEDLINE. Relevant data were extracted, organized in a table format, and analyzed using RevMan software for further analysis. This review comprised a total of 9 studies. The findings indicate that patients with TVT tape placement in the midurethra exhibited a slightly higher cure rate compared to those with proximal placement. Conversely, tape placement in the midurethra was associated with a significantly higher cure rate compared to distal placement [RR = 0.84, 95% CI (0.74-0.95), P < .05]. In the case of transobturator slings, tape positioning beneath the midurethra or distal urethra yielded better outcomes compared to placement near the bladder neck [RR = 0.74, 95% CI (0.57-0.94), P = .02; RR = 0.61, 95% CI (0.39-0.96), P = .03]. Based on 2D and 3D ultrasound imaging, differences in TVT placement appear to have minimal impact on the cure rate. However, the highest rate of failure after transobturator sling surgery is closely linked to the positioning.

Do the Ultrasonographic Measures of Midurethral Sling Location Relate With Surgical Outcomes?

IMPORTANCE

The proper placement of a midurethral sling (MUS) is the key factor for a successful surgical outcome.

OBJECTIVE

This study aimed to evaluate the relationship of perineal ultrasonographic measures of the tape location with subjective and objective outcomes after MUS surgery at midterm follow-up of women.

METHODS

The tape percentile (TP; total urethral length/bladder neck tape distance×100) and urethra tape distance (UTD; the shortest distance from the longitudinal smooth muscle complex of the urethra to the midpoint of the tape) were correlated with midterm surgical success. Patient satisfaction measured with the visual analog scale (VAS) was considered as the primary outcome. The presence of stress urinary incontinence on direct questioning, the Urinary Distress Inventory 6 (UDI-6) scores, findings of the cough stress test, free uroflowmetry, postvoid residual volume, and single-cycle voiding ambulatory urodynamic monitoring (AUM) were the other outcomes.

RESULTS

Seventy-eight women were evaluated at a mean follow-up of 4.4 ±3.3 years. Women who were highly satisfied (VAS ≥ 8) had a significantly higher TP (64.7% vs 50.8%, P < 0.001) and lower UTD (3.6 vs 4.5 mm, P = 0.018). Irritative, stress, and obstructive scores at UDI-6 increased as the tape was located closer to the bladder neck (P < 0.001, P < 0.001 and P = 0.044, respectively), and stress symptoms decreased with a tape closer to the urethra (P < 0.001). Women with detrusor overactivity at AUM were found to have a lower TP (P < 0.001).

CONCLUSION

The perineal ultrasonographic evaluation of tape location with UTD and TP seems to be well correlated with the women's midterm MUS surgical outcomes.

Use of intraoperative ultrasound to improve tension-free vaginal tape-obturator placement: A pilot study

OBJECTIVE

To evaluate the use of intraoperative ultrasound (IUS) to achieve a postoperative optimal placement of the tension-free vaginal tape-obturator (TVT-O).

METHODS

A cohort study was performed among women who underwent TVT-O placement. In 25 women, ultrasound was used for the placement, and based on current evidence, the optimal intraoperative and postoperative ultrasound pattern was selected. They were compared with 25 women where IUS was not used.

RESULTS

IUS increased operative time (by 7.5 min), and in 36% (9/25) of cases it was necessary to perform some corrections based on the ultrasound findings. After 1 month, in patients of the IUS group, the tapes were more frequently placed at a distance of 3-5 mm (P = 0.01), and it was more common for it to be placed between 40% and 70% relative to the urethral length (P = 0.011). Of tapes placed with IUS, 76% (met the optimal postoperative ultrasound pattern, as opposed to only 48% placed without IUS (P = 0.041). No differences were found in the complications or the functional results at 1 month post-surgery.

CONCLUSION

The use of IUS for the placement of TVT-O allows us to position them optimally and avoid erroneous placements, although IUS increases the operative time without improving the functional results and the rate of complications.

Using clinical estimate or catheter measurement of urethral mid-point result in similar retropubic mid-urethral sling position: a randomized trial

INTRODUCTION AND HYPOTHESIS

The objective was to determine whether standardized, intraoperative urethral measurement improves retropubic mid-urethral sling (RPMUS) positioning and if the intraoperative position remains stable at 2 weeks postoperatively.

METHODS

Participants undergoing a RPMUS were randomized to mid-urethral placement as per usual surgical care (no Foley catheter measurement, no-FCM) vs urethral mid-point Foley catheter measurement (FCM). The primary outcomes were RPMUS location as determined by 2D and 3D ultrasound 2 weeks postoperatively (as percentage from urethral meatus - relative to the urethral length) and intraoperatively following the RPMUS placement.

RESULTS

Forty-four women enrolled, underwent RPMUS, and provided baseline data and intraoperative ultrasound measurements; of these, 36 (82%) had interpretable intraoperative and postoperative ultrasound measurements. Demographic data were similar in the two groups. The mean RPMUS mid-point was 57 % and 55 % in measured and controls (p = 0.685); this same measurement was relatively unchanged at 2 weeks postoperatively at 57% and 54% respectively (p = 0.538). Very much and much improvement was reported on the PGI-I by 84% and 85% of participants in the FCM and no-FCM groups respectively.

CONCLUSIONS

Intraoperative RPMUS position at 2 weeks after surgery is similar to the intraoperative position. Compared with usual surgical care, intraoperative measurement of urethral mid-point with a Foley catheter did not affect RPMUS sling position.

Are Transperineal Ultrasound Parameters Useful to Predict Incontinence in Patients with Single-Incision Mini-Slings?

It would be logical to think that single-incision mini-slings (SIMS) should behave like the rest of the tension-free vaginal tape and, therefore, to believe that they present a similar ultrasound appearance, but there are no studies on this matter. Therefore, the main aim of our research is to determine which ultrasound parameters are associated with stress urinary incontinence (SUI) in patients carrying SIMS. A prospective observational study was carried out including 94 patients who were candidates for SUI corrective surgery with SIMS between 1 January 2021 to 31 December 2021 at the Universitary Hospital of Valme (Seville, Spain). A transperineal ultrasound evaluation was performed (six months after surgery) in order to study: the bladder neck–symphyseal distance, the posterior urethro–vesical angle, the pubic symphysis–tape gap, the tape–urethral lumen distance, the sagittal tape angle, the tape position, the concordance of movement between the tape and the urethra, and the axial tape angle. A total of 92 patients completed the study (63 asymptomatic and 29 symptomatic). Statistical differences were observed in the concordance of movement between the tape and the urethra (84.1% vs. 25.0%; p: 0.001) and in the axial tape angle at rest (139.3 ± 19.0 vs. 118.3 ± 15.4; p: 0.003) and at Valsalva (145.1 ± 20.2 vs. 159.1 ± 9.0; p: 0.034). Sagittal tape angle at rest was higher in urge urinary incontinence (UUI) patients (132.5 ± 35.7 vs. 143.3 ± 29.8; p: 0.001) and mixed urinary incontinence (MUI) patients (132.5 ± 35.7 vs. 157.8 ± 23.6; p: 0.025) compared to asymptomatic patients. In conclusion, the concordance between the movement of the tape and the urethra is the most useful ultrasound parameter to define continence in patients with SIMS.

Twisting of transobturator midurethral slings: does it matter?

INTRODUCTION AND HYPOTHESIS

We assessed rotation/twisting of transobturator midurethral slings (TOTs) and tested for associations with de novo chronic pain and voiding dysfunction.

METHODS

A retrospective pilot study including patients seen after Monarc™ TOT surgery at a single tertiary hospital in 2005-2016. Patients underwent an interview, clinical examination, uroflowmetry and 4D pelvic floor ultrasound. Volume datasets were analyzed blinded against all other data. Sling rotation/twisting was evaluated in volumes obtained at rest. The sling axis was measured relative to the vertical in the midline and in the most lateral parasagittal slice. Total sling rotation was calculated by summation of absolute angle differences between midline and lateral angles. "Corkscrew" rotation was noted when direction of rotation was opposite on the contra-lateral side.

RESULTS

The study included 215 patients. Fifty-two (24%) were excluded, leaving 163. Mean age was 57 years (28-87; SD 12), mean BMI 29.4 kg/m² (18.3-47.4, SD 6). Follow-up was at a median of 17 months (IQR 11-27). Chronic de novo pain was reported by 15 women (9%; dyspareunia by 11 and pelvic/vaginal pain by 4). On imaging, mean total sling rotation was 144° (12-335, SD 56). In the majority (n = 103, 63%) it rotated counter-clockwise from its midline position and in 30 (18%) it rotated clockwise. "Corkscrew" rotation was noted in 30 (18%). De novo chronic pain was associated with lower BMI and vaginal sling exposure but not with sling rotation. The latter was not found to be associated with voiding dysfunction either.

CONCLUSIONS

Monarc™ TOTs rotate considerably throughout their course. The degree of twisting or rotation and its direction was not found to be associated with de novo postoperative chronic pain or voiding dysfunction.

Sonographic assessment of compression effect on urethra following transobturator MUS

INTRODUCTION AND HYPOTHESIS

The aim of this study was to investigate the relationship between compression effect exerted by the sling on the urethra using translabial ultrasound and the prognosis of sling surgery in women for stress urinary incontinence (SUI).

METHODS

We retrospectively reviewed 151 women with SUI who had undergone either a TVT-Abbrevo (n = 81) or TVT-O (n = 70) procedure. Preoperative and 12-month postoperative assessments including sonographic data, urinary symptoms and signs were compared. Objective and subjective success rates were assessed at 12 months postoperatively.

RESULTS

Overall, 140 patients (92.7%) were objectively cured and 138 patients (91.4%) were subjectively cured of SUI 12 months after the operation with no significant differences between groups (p > 0.05). After both the TVT-Abbrevo and TVT-O procedures, the shortest distance between the tape and the urethral cavity line (TU) on straining (objective cure 4.1 mm vs. 4.5 mm, subjective cure 4.1 mm vs. 4.4 mm), the changes of the angle (∆) between the two arms of the sling (objective cure 15.8° vs. 20.8°, subjective cure 16.5° vs. 21.3°) and the gap between the sling and symphysis pubis (objective cure 9.9 mm vs. 12.1 mm, subjective cure 9.8 mm vs. 12.4 mm) were significantly smaller in the success group (p < 0.05). Analysis of ultrasound measurements in women reporting success and those reporting failure of the procedure showed the ∆TU (objective cure 1.6 mm vs. 0.9 mm, subjective cure 1.6 mm vs. 1.0 mm) and the angle on straining (objective cure 93.4° vs. 89.2°, subjective cure 94.3° vs. 88.9°) to be significantly bigger (p < 0.05). However, none of the assessed sonographic variables showed any significant differences between the TVT-Abbrevo and TVT-O groups.

CONCLUSIONS

The change in distance between the tape and urethral cavity line in the center of the urethra in the mid-sagittal plane after straining is an effective indicator of the compression effect exerted by the sling on the urethra after a mid-urethral sling (MUS) procedure and may contribute to both objective and subjective cure rates postoperatively.

Is it the Surgeon? A Re-examination of Mid-urethral Sling Complications

OBJECTIVE

To identify potential technical factors during initial mid-urethral sling (MUS) placement that contribute to subsequent sling revision procedures.

METHODS

A retrospective chart review was performed examining synthetic MUS reoperations at a single institution from 2008-2020. The implanting surgeon's operative note, when available, was critically reviewed with respect to trocar placement, sling location, and tensioning technique. The reoperative report was reviewed for aberrant intraoperative findings relating to the index surgery.

RESULTS

A total of 306 women underwent revision of their MUS. Operative reports from the implanting surgeon were available for 276 (90.2%) women. Review of index operative reports revealed 47 unambiguous descriptions of improper technique, including 19 cases of described excessive tensioning and 2 cases of MUS placement despite noted urethral injury during the index case. Indications for reoperation were clinical obstruction (63%), pain (40%), and mesh erosion/exposure (33%). In 186 (67.4%) women, there was an intraoperative finding during the revision that likely contributed to the need for reoperation. Among these 186 women, 110 (59.1%) slings were noted to have been placed too proximally, 78 (41.9%) were over-suspended, and 57 (30.6%) were placed too deep in the periurethral fascia.

CONCLUSION

Review of the index operative note and findings at operative re-exploration of MUS surgeries, often reveals evidence that the initial MUS implantation was technically suboptimal. Such findings suggest that intraoperative surgical technique is a critically important factor contributing to postoperative complications in MUS surgery. This underscores the importance of surgical training and adherence to surgical principles during the placement of a synthetic MUS.

Translabial Ultrasound for Assessment of Synthetic Midurethral Sling Complications

ABSTRACT

Translabial ultrasound (TLUS) is an inexpensive, noninvasive imaging modality traditionally used for assessment of pelvic organ prolapse. The utility of TLUS has recently been expanded to the evaluation of synthetic midurethral slings (MUS) surgically implanted for management of stress urinary incontinence. The purpose of this article is to familiarize radiologists with translabial ultrasound technique and provide a technical protocol for TLUS execution because it can be optimized for imaging and assessment of MUS, including identification of MUS configuration and recognition of common complications. This article provides example images of transobturator and retropubic slings and their associated complications, as visualized on TLUS. Accurate imaging and assessment of MUS is helpful in the evaluation of the patient presenting with symptoms suspicious for sling-related complications and in the planning of surgical revision.

Meshy business: MRI and ultrasound evaluation of pelvic floor mesh and slings

Pelvic floor disorders are a complex set of conditions including but not limited to stress urinary incontinence and pelvic organ prolapse that generally affect older and multiparous women. Of the several surgical options available for treatment of these conditions, synthetic mid-urethral slings for stress urinary incontinence and vaginal mesh for pelvic organ prolapse are amenable to imaging evaluation by ultrasound and magnetic resonance imaging techniques. Ultrasound can evaluate the sub- and immediate peri-urethral portions of sling due to its ability to differentiate synthetic material from native tissues with real-time imaging, while MRI is able to better depict the global pelvic floor anatomy and assess the more distant components of mesh and slings material. Given the high prevalence of pelvic floor disorders and complications after surgical repair, it is important that radiologists familiarize themselves with normal and abnormal imaging findings after these procedures. This article provides a review of the spectrum of imaging findings in patients after pelvic floor repair with synthetic mid-urethral slings and vaginal mesh.

Pelvic floor ultrasound: when, why, and how?

Pelvic floor disorders are a significant medical issue, reportedly affecting nearly one in four women in the United States. Nonetheless, until the last decade, there has been relatively limited imaging research into this highly prevalent disorder. The three major imaging modalities utilized to assess pelvic floor function are ultrasound, MRI and fluoroscopy. Pelvic floor ultrasound is a rapidly emerging technique which takes advantage of the widespread availability of ultrasound, the non-invasive and relatively inexpensive approach and the incorporation of real-time imaging and software advances which permit 3-D volume imaging. Pelvic floor ultrasound provides the opportunity to optimize patient counseling and enhance pre-operative planning by providing an anatomic and functional roadmap for the referring clinician. We recommend the consideration of pelvic floor ultrasound, as described here, as an addition to the imaging armamentarium available to physicians and surgeons serving this patient population.

Urethral length and bladder neck behavior: can dynamic magnetic resonance imaging give the same results as introital ultrasound?

PURPOSE

To compare dynamic magnetic resonance imaging (dMRI) and introital ultrasound results with regard to urethral length measurements and the evaluation of bladder neck changes.

METHODS

Retrospective analyses of urethral length measurements and detection of bladder neck changes (rotated/vertical bladder neck descent, urethral funneling) were conducted in women-scheduled for surgical treatment with alloplastic material-who had undergone introital ultrasound and dMRI presurgery and 3 months postsurgery. Measurement differences between both imaging modalities were evaluated by assessing the confidence interval for the difference in means between the datasets using bootstrap analysis.

RESULTS

Based on data from 40 patients (320 image series), the urethra could be clearly measured on every pre- and postsurgical dMRI dataset but not on preoperative ultrasound images in nine women during Valsalva maneuver due to a large cystocele. The estimation of the mean difference distribution based on 500,000 bootstrap resamples indicated that the urethral length was measured shorter by dMRI pre- and postsurgery at rest and postsurgery during Valsalva maneuver (median 1.6-3.1 mm) but longer by dMRI (median 0.2 mm) during Valsalva maneuver presurgery. Rotated/vertical bladder neck descent and urethral funneling diagnoses showed concordance of 67-74% in the direct comparison of patients; the estimation of the concordance indicated poorer outcomes with 50-72%.

CONCLUSIONS

Metric information on urethral length from dMRI is comparable to that from introital ultrasound. dMRI is more advantageous in cases with an extended organ prolapse. At present, dMRI does not give the same diagnosis on bladder neck changes as introital ultrasound does.

Sonographic sling position and cure rate 10-years after TVT- O procedure

AIM

To examine the position of the TVT-O sling 10 years postoperatively and its association with outcome.

METHODS

A total of 124 patients who received a TVT-O sling at two centers in 2004 and 2007 were invited for follow-up. The position of the sling on perineal ultrasound was described relative to the bladder neck and the lower margin of the pubic symphysis at rest and on Valsalva. Objective cure was defined as a negative cough stress test at 300 ml. Subjective cure was evaluated with the Kings´ Health Questionnaire (KHQ), Incontinence Outcome Questionnaire (IOQ), Female Sexual Function Index Questionnaire (FSFI) and the Patient Global Impression of Improvement score (PGII).

RESULTS

78 of 124 patients (57%) were available for follow-up 10 years after surgery. I Eleven (14%) had undergone reoperation and were excluded. Tapes were visualized in the remaining 67 (54%) women. The subjective and objective cure rates in this sub-cohort were 67% (45/67) and 77% (52/67), respectively. In these 67 women the mean distances from the bladder neck to the proximal edge of the tape (BNTD) during Valsalva maneuver were significantly higher in cured women compared to the not-cured women (11.2 vs. 9.4mm). The distance between tape and urethra (TUD) was significantly lower in cured vs. not cured patients (2.6 vs. 4.1mm). All women with a TUD of >5mm (n = 5) were incontinent. Tape position was not associated with overactive bladder symptoms.

CONCLUSIONS

Tape position near the bladder neck and large distance to the urethra is associated with incontinence 10 years after TVT-O.

Demographic risk factors for mid-urethral sling failure. Do they really matter?

Age, obesity and vaginal deliveries (VD) are recognized risk factors for stress urinary incontinence (SUI). According to many authors, the abovementioned risk factors for incontinence also increase the risk of mid-urethral sling (MUS) failure. Our aim was to evaluate the objective and subjective effectiveness of retropubic MUS in 12 months observation, relative to the three potential risk factors of failure: obesity, age and VDs. A prospective observational study including 238 women who underwent retropubic MUS implantation was performed. Patients were divided into subgroups: obese vs non-obese, <65 vs ≥65 years old and no history of VD vs ≥1 VD. Follow-up took place between 6 and 12 months post-surgery. Cough test, 1-hour pad test, pelvic floor ultrasound examination, and Incontinence Impact Questionnaire 7 (IIQ-7) results were assessed pre- and post-operatively. Of the 238 patients, 208 (86.3%) completed a minimum follow-up period of 12 months. Significant improvement in the pad test was observed in all patients (83.2 ± 78.6 g vs 0.7 ± 3.3 g). Negative cough test results were obtained in over 94% of patients. Significant improvement in the IIQ7 results was observed in all patients (74.2 ± 17.7 vs 5.5 ± 13.4). No significant differences in all the analyzed parameters with regard to BMI, age and parity were observed. No combination of risk factors influenced the objective and subjective cure rates. Our study demonstrated that older age, obesity and history of VDs have no impact on objective and subjective sling effectiveness in a short term observation. There is no influence of combined demographic features on the failure risk.

Demographic features of female urethra length

AIMS

To determine cohort urethral length, identify epidemiological factors influencing the parameter and to establish the percentage of cases with clinically relevant outsized urethras.

METHODS

Prospective cohort study conducted in two tertiary clinical centers between 2013 and 2017. Nine hundred and twenty seven consecutive adult, Caucasian females attending outpatients' clinics were included. The urethral length has been measured in pelvic floor ultrasound examination. The exclusion criteria were inadequate bladder filling (<200 mL; >400 mL), previous history of pelvic floor surgery, and no consent.

RESULTS

Urethral length varied from 19 to 45 mm. The distribution of the examined parameter was normal. Obese patients had significantly longer urethras as compared to non-obese subjects. Number of vaginal deliveries was connected with shorter urethral length. The limitations of the study are: analysis only of Caucasian patients and subjects without previous pelvic floor surgeries.

CONCLUSIONS

Differences in urethral length in the female population were demonstrated. Thirty percent of patients have atypical urethras that may be a risk factor for sling surgery failure. We therefore postulate introduction of urethral measurement before the procedure.

Does the suburethral sling change its location?

OBJECTIVES

To ascertain whether a phenomenon of sling migration exists after suburethral sling placement, whether this might be responsible for suboptimal sling location and persistent incontinence, and whether a link exists between sling dislocation or migration and risk factors, such as obesity or age.

METHODS

The present prospective cohort study was carried out in a group of 244 patients who underwent retropubic sling implantation. Sling location was determined by means of pelvic floor ultrasound, and calculated relative to the individual patient's urethral length measured before the procedure. The sling location was visualized on 1 day, and 1 and 6 months post-surgery. Overweight/obese and elderly patients were analyzed separately to assess the possible influence of those factors on sling location.

RESULTS

The mean urethral length in the studied cohort was 28.76 ± 3.67 mm. The mean tape position 1 day post-surgery was 66.18 ± 8.43% of the urethral length, and it did not change 1 and 6 months post-surgery in the whole group. Similar results were obtained in elderly and overweight/obese patients.

CONCLUSIONS

Suboptimal sling location appears to result from incorrect surgical technique, and should be diagnosed and treated early after the primary surgery. Sling location does not change after mid-term follow up.