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Transperineal Sonography and Urodynamic Findings in Women With Lower Urinary Tract Symptoms After Sling Placement.

OBJECTIVES: To evaluate dynamic 2-dimensional (2D) transperineal pelvic sonographic findings and urodynamic studies in women with lower urinary tract symptoms after midurethral sling placement.

METHODS: Transperineal pelvic sonography and urodynamic studies were reviewed from women with a midurethral sling and lower urinary tract symptoms. The shape and sonographic dynamic change of the sling from the rest position to the maximum Valsalva maneuver and back to rest were recorded. Patients were categorized into 3 groups: group I, at rest, the sling lies parallel to the urethral lumen, and during Valsalva, the sling becomes C shaped; group 2, both at rest and during Valsalva, the sling runs parallel to the urethral lumen; and group 3, at rest, the sling is C shaped, and during Valsalva, this curved shape is maintained. For analytical purposes group 3 was compared with groups 1 and 2. Multiple logistic regressions were used to evaluate the association between transperineal pelvic sonography and urodynamic studies.

RESULTS: Seventy-seven women were enrolled. The detrusor pressure at the maximum flow rate was significantly higher in group 3 than groups 1 and 2 (mean ± SD, 36 ± 16 versus 19 ± 11 mm H2 O; P < .001). The odds of high detrusor pressure (>20 mm H2 O) in group 3 was approximately 12 times the odds of those in groups 1 and 2. After adjusting for other variables using a multiple logistic regression analysis, a statistically significant association between group 3 and high detrusor pressure persisted (odds ratio, 29.7; 95% confidence interval, 2.949-299.6; P = .0040) persisted.

CONCLUSIONS: Transperineal dynamic 2D sonography can help predict women with high-pressure voiding after midurethral sling placement and aid in the diagnosis of bladder outlet obstruction.

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