Alteration of pelvic floor biometry in different modes of delivery


Objective: The objective of this study is to investigate and compare the effects of different modes of delivery on bladder neck mobility, anorectal angle and levator hiatus distensibility detected by ultrasound assessment.

Methods: Two hundreds nulliparous women were divided into two groups based on their type of delivery, vaginal delivery (VD) group and cesarean section (CS) group. The biometry of pelvic floor, including bladder neck mobility, anorectal angle and levator hiatus distensibility, in both groups of women was observed and compared at 6-8 weeks after delivery by perineal ultrasound assessment.

Results: On valsalva, the bladder neck mobility in the VD group was significantly increase, when compared with CS group (P<0.05). However, here was no significant difference between two groups at rest. The anorectal angle (ARA) was no significant differences between two groups at rest and on valsalva. Compared with the CS group, transverse diameters (LR), anteroposterior (AP) and levator hiatal area (LHA) of levator hiatus in VD group were significantly increased at rest and on valsalva (P<0.05)

Conclusion: Perineal ultrasound can objectively and movably detect pelvic floor dysfunction of women after different modes of delivery, and a normal VD may be a risk factor for pelvic floor dysfunction.

Keywords Pevic floor biometry; Delivery; Ultrasound.

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