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Does the vaginal wall become thinner as prolapse grade increases?

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PubMed
Summary

Vaginal wall thickness (VWT) decreases with increasing prolapse severity until it extends beyond the hymen. Beyond this point, VWT increases, suggesting tissue changes rather than defects in women with pelvic organ prolapse.

Keywords:
ProlapseUltrasonographyVaginal wall thickness

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Area of Science:

  • Urogynecology
  • Pelvic floor disorders
  • Anatomical imaging

Background:

  • The exact causes of pelvic organ prolapse (POP) remain unclear, with prevailing theories suggesting either fibromuscular defects or tissue attenuation.
  • Understanding the structural changes in the vaginal wall is crucial for elucidating prolapse pathophysiology.

Purpose of the Study:

  • To investigate the relationship between vaginal wall thickness (VWT) and the severity of symptomatic pelvic organ prolapse (POP).

Main Methods:

  • Ultrasonography was employed to measure mean VWT at anterior and posterior vaginal wall sites in 243 women with symptomatic prolapse.
  • Vaginal prolapse severity was assessed using the Pelvic Organ Prolapse Quantification (POP-Q) system.
  • Statistical analyses, including t tests, Kruskal-Wallis, and Friedman tests, were used to compare VWT across different prolapse grades.

Main Results:

  • Vaginal wall thickness (VWT) was found to decrease as prolapse grade increased, up to the point where the prolapse extended beyond the hymen.
  • Women with grade 3 prolapse exhibited significantly greater mean VWT compared to those with grade 1 or 2 contained prolapse.
  • Menopausal status did not demonstrate a significant impact on VWT measurements.

Conclusions:

  • Vaginal wall thickness (VWT) is reduced in women with vaginal prolapse, but thickens once the prolapse extends beyond the hymen, becoming comparable to non-prolapsed states.
  • These findings suggest that observed changes in VWT may be attributed to alterations in vaginal tissue composition, such as reduced collagen and elastin, and potential fibrosis in exposed areas, rather than primary tissue defects.