Method of limits: Female genital stretch perception thresholds

Area of Science:

• Neuroscience
• Gynecology
• Sensory Physiology

Background:

• Women with pelvic organ prolapse often report vaginal laxity and altered sensation, which anatomical assessments do not fully explain.
• Altered vaginal sensation may contribute to the pathophysiology of vaginal laxity, necessitating objective measurement tools.

Purpose of the Study:

• To develop and validate quantitative sensory testing (QST) for vaginal tone sensation using genital stretch perception thresholds (PT).
• To assess the reproducibility of the QST method and its association with age and parity.

Main Methods:

• A prospective observational cohort study involving healthy women.
• Quantitative sensory testing (QST) using the method of limits was performed at the vagina and introitus to assess first awareness and stretch perception.
• Repeatability was assessed through intra- and inter-rater reliability testing.

Main Results:

• The QST method demonstrated good to excellent intra- and inter-rater repeatability for both first awareness and stretch perception.
• Significant associations were found between increasing age and higher perception thresholds (reduced sensation) for both awareness and stretch.
• No significant association was observed between parity and perception thresholds.

Conclusions:

• Quantitative sensory testing (QST) for vaginal tone sensation is clinically feasible, valid, and reproducible.
• This validated test can serve as a valuable tool for objectively measuring sensation in women experiencing symptoms of vaginal laxity.