Transperineal three-dimensional ultrasound for analyzing the effects of perineal stretching with EPI-NO in women with multiple pregnancies: a pilot study.

Objective: To compare the changes in the pelvic floor of women with twin pregnancies who practiced muscle stretching with the EPI-NO vaginal dilator, as assessed using transperineal three-dimensional ultrasound (3DUS).

Method: This prospective cross-sectional case-control study included nulliparous women in the third trimester of their multiple pregnancies and divided them into the control group (CG,  = 9) and EPI-NO group (EpiG,  = 9). During pretreatment, the women underwent transperineal 3DUS to establish the morphometric measurements of the pelvic floor. The CG received guidance regarding pelvic floor muscles, whereas the EpiG underwent weekly physical therapy sessions with the EPI-NO dilator for 20 min/day. Following this treatment, all women were reassessed using transperineal 3DUS, and the diameter of the EPI-NO balloons of the women in the EpiG was measured (epinometry). Paired samples t-test was used for comparative analysis.

Results: The EpiG showed improved perineal distensibility, which was evidenced by the increase in sagittal diameter at rest ( < .01). Transperineal 3DUS among women in the EpiG showed a significant increase in the sagittal measurement ( = .02), hiatal circumference at rest ( = .03), and epinometry values (diameter of the EPI-NO balloon;  < .01). The increase in epinometry values was directly correlated ( = .02) with the number of physical therapy sessions.

Conclusion: EPI-NO increased pelvic floor distensibility in women with twin pregnancies, as confirmed using transperineal 3DUS and epinometry. This device promoted an increase in perineal distensibility with a single use; however, better results would be obtained with additional sessions.