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Objective: To evaluate the correlation between postvoid residual urine volumes assessed by transvaginal ultrasonography and by catheterization in women that had pelvic floor dysfunction.
Methods: Measurement of postvoid residual urine volume was performed in 78 women who presented with pelvic floor dysfunction at the Urogynaecology Clinic, Ramathibodi Hospital. Transvaginal ultrasonography was used to measure three diameters of the bladder in two perpendicular planes. Postvoid residual urine volumes were calculated using the formula “postvoid residual volume = (height x width x depth) x 0.7” and these volumes were compared with those obtained from catheterization in each patient.
Results: Pelvic organ prolapse, stress urinary incontinence and mixed urinary incontinence were found in 53.8%, 46.2% and 41.0% of women, respectively. The postvoid residual urine volumes assessed by transvaginal ultrasonography were significantly correlated with the catheterized urine volumes. These two methods had high correlation coefficient of 0.99 (P < 0.001). The mean difference of bladder volume from the two assessments was 6.02 ml (95% CI, 7 - 19)
Conclusions: The transvaginal ultrasonography is a non-invasive technique that has high correlation with catheterized urine volume when was used to assess postvoid residual urine volumes in women with pelvic floor dysfunction.
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