Two minutes is sufficient to characterize the viscoelastic properties of the human lower birth canal during the first stage of labor.

Background: The lower birth canal is the final constriction through which a fetal head must pass for delivery. Unfortunately, injuries to the lower birth canal tissues occur in up to 19 % of first-time vaginal deliveries due to the 300 % stretch required.

Methods: This is a secondary analysis of data from 56 healthy nullipara recorded by a lower birth canal dilator during the first stage of labor.

Hiatus and pelvic floor failure patterns in pelvic organ prolapse: A 3D MRI study of structural interactions using a Level III conceptual model.

Background: A large urogenital hiatus in Level III results in a higher risk of developing pelvic organ prolapse after birth and failure after prolapse surgery. Deepening of the pelvic floor and downward rotation of the levator plate have also been linked to prolapse. Currently we lack data that evaluates how these measures relate to one another and to prolapse occurrence and size.

MRI-Based Structural Failure Comparison between Chinese and American White Women With Prolapse: A Case-Control Study.

Introduction And Hypothesis: Although some evidence suggests that Chinese and white women might have different pelvic floor anatomy such as levator complex and connective tissue support for pelvic organs, it is unknown if these differences affect the mechanisms of pelvic organ prolapse. We sought to determine whether differences exist in MRI-based structural failure patterns between Chinese and American white women with prolapse.

Methods: This is a case-control study in different racial cohorts recruited in China and the USA.

Urethral tissue characterization using multiparametric ultrasound imaging.

A decrease in urethral closure pressure is one of the primary causes of stress urinary incontinence in women. Atrophy of the urethral muscles is a primary factor in the 15 % age-related decline in urethral closure pressure per decade. Incontinence not only affects the well-being of women but is also a leading cause of nursing home admission.