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Updated: Jun 4, 2026

Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse (POP) Quantification System
Published on: September 20, 2018
Is there a pelvic organ prolapse threshold that predicts bladder outflow obstruction?
Christina E Dancz1, Begüm Ozel
1Division of Female Pelvic Medicine and Reconstructive Surgery, Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, 1200 N State St IRD 518, Los Angeles, CA 90033, USA. dancz@usc.edu
Anterior vaginal wall prolapse is linked to bladder outflow obstruction (BOO). However, this study found no specific prolapse measurement that reliably predicts BOO in women.
Area of Science:
- Urogynecology
- Pelvic Floor Disorders
- Female Urology
Background:
- Anterior vaginal wall prolapse is common in women.
- Bladder outflow obstruction (BOO) can occur in women with pelvic organ prolapse.
- Identifying predictive factors for BOO is crucial for surgical planning.
Purpose of the Study:
- To investigate if a specific degree of anterior vaginal wall prolapse can predict bladder outflow obstruction.
- To establish a clinical cutpoint for anterior prolapse indicating risk of BOO.
Main Methods:
- Comparative study of women with and without diagnosed bladder outflow obstruction.
- Analysis of baseline characteristics, urodynamic findings, and pelvic organ prolapse quantification (POP-Q) measurements.
- Receiver operator curve (ROC) analysis to identify potential predictive cutpoints.
Main Results:
- Women with BOO were older, had higher parity, and smaller maximum bladder capacity.
- Higher Aa and Ba measurements (anterior vaginal wall prolapse) were observed in women with BOO.
- ROC analysis did not identify a clear cutpoint of anterior prolapse to predict bladder outflow obstruction.
Conclusions:
- Bladder outflow obstruction is associated with anterior vaginal wall prolapse.
- No specific anterior vaginal wall prolapse measurement reliably predicts bladder outflow obstruction.
- Further research may be needed to identify predictive markers for BOO in this population.
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