Abstract Objective: To investigate the imaging features of pelvic floor ultrasound (PFU) combined with tomographic ultrasound imaging (TUI) for diagnosing pelvic diaphragm hiatus of women with organ prolapse. Methods: 78 women with organ prolapse were enrolled in research group from January 2017 to May 2018, and 25 healthy women diagnosed by vaginal three-dimensional physical examination were selected in control group during the same peroid. The pelvic floor hiatus areas of women in both groups were obtained by PFU, and the women with pelvic diaphragm hiatus dilatation were divided into women with mild dilatation (25-29cm2), women with moderate dilatation (30-34.9cm2), and women with severe dilatation (>35cm2). PFU combined with TUI was used to examine the closure integrity and fracture status of the pelvic diaphragm hiatus of all women. The relationship between the pelvic floor hiatus area and the rates of menopause, fertility, or hysterectomy of women was analyzed. Results: In the research group, there were 38 women with mild dilatation (48.7%), 25 women with moderate dilatation (32.1%), and 15 women with severe dilatation (19.2%). The average area of pelvic diaphragm hiatus of women in the research group was 28.58±2.25 cm2, which was significant larger than that (15.33±1.93 cm2) of women in the control group，and the rate of levator ani muscle rupture of women in the research group was 43.6%, which was significant larger than that (4.0%) of women in the control group (P<0.05). In the research group, the area of pelvic diaphragm hiatus of women with menopausal, with total hysterectomy, or after delivery had expanded significantly, and the area of pelvic diaphragm hiatus of women had expanded with the number of delivery increased (P<0.05). Conclusion: PFU combined with TUI can effectively observe the fracture of the pelvic diaphragm hiatus and the levator ani muscle fracture. The pelvic diaphragm hiatus area of women with menopause, with total hysterectomy, or women after several delivery has expanded significantly.
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