A short length of gonadotropin hyperstimulation is sufficient to achieve an optimal IVF outcome in advance-aged women

Abstract

Objective: To analyze the duration of gonadotropin hyperstimulation's impacts on oocyte quality and clinical outcomes in aged in vitro fertilization (IVF) patients. Materials and methods: This retrospective study was carried out using IVF records of the Chang Gung Memorial Hospital IVF center from January 2017 to December 2019. A total of 308 IVF cycles with patients aged 40–44 years were included. Clinical characteristics of patients who received a short controlled ovarian hyperstimulation (COH) (i.e., 6–7 days; s-COH group) or a long COH treatment (i.e., 9–10 days; l-COH group) were compared. In addition, analysis was conducted using data within two age subgroups: 40–42 years and 42–44 years subgroups. Results: The s-COH group received significantly lower total doses of gonadotropin and had smaller leading follicles at the time of ovulation trigger when compared to the l-COH group. The s-COH group also produced a significantly lower number of oocytes, mature metaphase II (MII) oocytes, and 2 PN zygotes compared to the l-COH group. However, there was no significant difference in the number of transferable and good-quality embryos between the two treatment groups. Likewise, the pregnancy rate and live birth rate were comparable in the s-COH and l-COH groups. Similar results were obtained when the analysis was limited to select age subgroups (i.e., 40–42 and 42–44 years subgroups). Conclusion: While a long COH generates more oocytes per cycle, a 6–7 days COH treatment, which is at the lower end of the recommended window of stimulation, could achieve a pregnancy outcome comparable to that applied 9–10 days of COH in aged patients.

Keywords

• Aged
• Controlled ovarian hyperstimulation
• Gonadotropin
• Infertility
• IVF