The aim of this study was to investigate the relationships between uterine size and volume and clinical pregnancy rate. This longitudinal study was conducted among patients undergoing assisted reproduction technology (ART) treatment at the Reproductive Medicine Center from January 2010 to May 2017, all of whom provided informed consent to participate in the study. The uterine size, for all patients, was measured by transvaginal ultrasonography before ovarian stimulation. Clinical pregnancy was diagnosed by ultrasound confirmation of at least an intrauterine gestational sac and fetal cardiac activity 4 weeks after embryo transfer. A total of 11,924 patients were enrolled in this study. Compared to patients with uterine lengths of 50 to 59 mm (referent), patients with uterine lengths ≥60 mm had a lower clinical pregnancy rate. Compared to patients with uterine widths of 30 to 39 mm (referent), patients with uterine widths of 40 to 49 mm and those with uterine widths of ≥50 mm had a lower clinical pregnancy rate. Compared with those with a uterine anteroposterior diameter of <30 mm (referent), patients with uterine anteroposterior diameters of ≥50 mm had a lower clinical pregnancy rate. Compared with those with a uterine volume of 30 to 49 mL (referent), patients with a uterine volume ≥70 mL had a lower clinical pregnancy rate. The patients with an optimal uterine length, width, anteroposterior diameter, and volume had a higher clinical pregnancy rate than those with suboptimal uterine measurements. Uterine sizes and volumes that were too large reduced the clinical pregnancy rate.
The aim of this study was to describe the size and the shape of gravida-0 uteri in infertile Chinese Han women according to age, height, and body mass index (BMI).Registered data obtained from the Department of Reproductive Medicine, Xiangya Hospital of Central South University, were collected and analyzed. The length, width, and anteroposterior diameter of the uteri of nonpregnant women aged 20 to 45 years were measured by transvaginal ultrasonography. Statistical analyses among different populations were conducted using a 1-way analysis of variance analysis or a Kruskal–Wallis H test.A total of 5726 primary infertile women were enrolled. The mean age of the sample group was 29.18 ± 4.22 years, and the mean BMI and the mean height of them were 21.51 ± 2.91 kg/m2 and 158.13 ± 4.71 cm, respectively. The mean uterine length, width, anteroposterior diameter, and L/W ratio were 49.33 ± 7.00 mm, 39.94 ± 7.23 mm, 44.95 ± 8.11 mm, and 1.2662 ± 0.2465, respectively. There were a statistically significant positive correlations between uterine length, width, anteroposterior diameter, and age in infertile women (all P < .001). Uterine L/W ratio gradually decreased with age, which was statistically significant (P < .001). The correlations between uterine length, width, anteroposterior diameter, and height were also considered statistically significant (all P < .001), while there was no correlation between L/W ratio and height. The results showed that uterine size and BMI had no statistical significance.The uterine length, width, and anteroposterior diameter gradually increased with increased age and height, but the increasing extents was different, and the uterine shape became rounder with age and had not changed with height in primary infertile women.
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