The importance of uterosacral ligament anatomy in overactive bladder: A preliminary study

Lax Uterosacral Ligament and Urge Urinary Incontinence: MRI Findings in Symptomatic Patients Versus Healthy Volunteers

INTRODUCTION AND HYPOTHESIS

The objective was to explore the association between urge urinary incontinence (UUI) and lax uterosacral ligaments (USL) using MRI.

METHODS

Sixty-seven female participants were recruited prospectively: 41 continent volunteers (control group) and 26 patients with UUI. Static proton density- and T2-weighted turbo spin echo sequences of MR images were used. A radiologist employed a standardized grid system to record structural observations of the USLs on sequentially numbered axial MR images and then applied a four-point grading scale to assess ligament visibility. MR images were interpreted by a radiologist and a urologist, and then validated by an expert radiologist.

RESULTS

The comparison between the mean length of uterosacral ligaments in the control and UUI groups was highly statistically significant (p < 0.001). The mean length of the right USL was 38 ± 11 mm, and the left USL was 35 ± 12 mm in the UUI group. In the control group, the mean length of the USL was 22 ± 9 mm on the right side and 18 ± 9 mm on the left side, along their craniocaudal extent. The highest inter-observer agreement was on the level of origin and insertion (image numbers), whereas the lowest agreement was on the anatomical site of origin and insertion of the USL in both the control and UUI groups.

CONCLUSIONS

The average length of USLs in patients with UUI is significantly longer than that in healthy continent women, indicating laxity. Our findings support the relationship between the laxity of the USL and UUI symptoms and have therapeutic implications.

Study of female pelvic floor muscle in overactive bladder based on MRI 3D reconstruction

Background

This study examined the three-dimensional (3D) morphological changes of the urination and urinary continence anatomical structures in overactive bladder (OAB) patients, to offer a morphological data for OAB diagnosis and treatment.

Methods

Eleven OAB patients, 9 healthy females and 22 pelvic organ prolapse (POP) patients were enrolled and underwent MRI scans. The anatomical components of urination (bladder detrusor) and the urinary continence (main part of the urethral sphincter, compressor urethrae, and levator ani muscle (LAM) were 3D reconstructed and measured with Amira software. We also analyze the relativity between pelvic floor muscle’s morphological parameters among the volunteers, OAB and POP group.

Results

Through 3D reconstruction, increased thickness and volume of the bladder detrusor were found in the OAB patients compared with volunteers (3.1 ± 0.7 mm vs. 1.9 ± 0.3 mm; P = 0.000 and 50,632.0 ± 19,724.7 mm³ vs. 23,386.6 ± 7826.3 mm³; P = 0.001). The volume of LAM showed no significant difference between the OAB patients and volunteers (27,089.4 ± 5015.0 mm³ vs. 27,294.4 ± 4461.4 mm³; P = 0.924); whereas, LAM’s volume of the POP patients was significantly larger than that of the volunteers (34,130.6 ± 7968.3 mm³ vs. 27,294.4 ± 4461.4 mm³; P = 0.023). The thickness and volume of the main part of urethral sphincter were significantly lower in the OAB patients compared with volunteers (2.2 ± 0.5 mm vs. 2.7 ± 0.3 mm; P = 0.018 and 2558.6 ± 703.2 mm³ vs. 23,267.3 ± 681.9 mm³; P = 0.035). The volume of the compressor urethrae was significantly lower in the OAB patients than that in the volunteers (630.3 ± 301.2 mm³ vs. 866.1 ± 514.2 mm³; P = 0.247).

Conclusions

In OAB patients, the bladder detrusor has long-term tension and contraction, which thickened muscle and increased volume, and aggravate urination. The compressor urethral and main part of urethral sphincter are weaker and the anterior part of LAM hiatus is relaxed, easily resulting in leakage of urine and ultimately incontinence. The MRI 3D reconstruction and measurement can help to evaluate pelvic floor urination and continence function, and accurately diagnose.

Does apical prolapse in addition to early stage anterior prolapse have any effect on lower urinary tract symptoms?

OBJECTIVE

To investigate whether apical prolapse in addition to early-stage anterior prolapse has any effect on lower urinary tract symptoms (LUTS).

METHODS

Patients with early-stage pelvic organ prolapse (POP) were retrospectively analyzed at the urogynecology unit of a tertiary referral center. Cases with posterior POP were excluded, and the remaining women were distributed across four main groups: (1) no determinable anterior and/or apical POP (control); (2) isolated anterior POP; (3) anterior + apical POP; and (4) isolated apical POP. Each LUTS symptom in these groups was recorded. Women with isolated anterior POP and women with anterior + apical POP were then compared to define the additional effects of apical prolapse on LUTS. In order to asses; symptoms of urgency, urinary incontinence, stress urinary incontinence, frequency, abnormal emptying, hesitancy, interrupted stream, nocturia, post-micturition dribble, and dysuria were noted and Incontinence Impact Questionnaire (IIQ-7), and domains of Urinary Distress Inventory (UDI-6) were compared between the groups.

RESULTS

Of the 225 patients, 66 were excluded from the analysis due to accompanying posterior compartment defect. There was no statistically significant difference for age, systemic disease history, or smoking status between the groups (p > 0.05). However, history of traumatic vaginal delivery was significantly lower in the control group than in the other groups (p = 0.039). The prevalence of hesitancy and interrupted stream were found to be significantly higher in the anterior + apical POP group than in the isolated POP group (p<0.05). Obstructive subscale of the Urinary Distress Inventory was higher both in the isolated anterior POP and anterior + apical POP groups than the control group (p<0.05).

CONCLUSION

The current study demonstrates that even minimal loss of apical support accompanying anterior prolapse exacerbates LUTS.