Abstract:Objective To study the clinical characteristics and risk factors of unexpected poor ovarian response in patients with normal ovarian reserve in IVF / ICSI cycles.Methods This study was focused on infertile women who were diagnosed with poor ovarian response but normal ovarian reverse, with an age < 40 years, follicle-stimulating hormone (FSH) < 10 IU/L and antral follicle count 7-20. A retrospective study was performed among the patients in Peking University First Hospital reproductive center from January 2012 to December 2017. The 81 cycles that had less than or equal to 3 retrieved oocytes were defined as studied cases. Each case was matched with one control cycle by age, basal FSH level, AFC and protocol of controlled ovarian stimulation (COS) and time of therapy. We examined between-group differences in terms of the clinical characteristics (in hCG day), process of therapy and pregnant outcomes.Results The body weight, body mass index (BMI), basal FSH, and progesterone-to-follicle index (PFI) of case group were higher than that of control. Compared to the controls, the cases had a significantly lower level of gonadotropins days, estradiol, progesterone or counts of follicles ≥14 mm; and a significantly higher level of PFI. Additionally, cumulative pregnancy rate or number of retrieved oocytes, MII oocytes, embryos, high-quality embryos, or transplantable embryos was also significantly lower in cases than that in controls. Results of conditional logistic regression suggested that high BMI and low basal LH were risk factors of unexpected poor ovarian response.Conclusion High BMI and low basal LH increases the incidence of unexpected poor ovarian response. Higher PFI, lower estradiol, and smaller number of follicles ≥14 mm in the hCG day are associated with less retrieved oocytes and lower pregnancy rate. Individually specific COS need to be planned, according to evaluation of ovarian function. Losing weight may reduce the risk of unexpected poor ovarian response.
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