#100 : Can the Dual Trigger be Effective in Improving Oocyte Maturation and Embryo Quality Compared to the HCG Trigger or the GnRH-a Trigger?

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Background and Aims: HCG was the standard trigger of final oocyte maturation in IVF cycles. An alternative trigger with gonadotropin releasing hormone agonist (GnRH-a) was effective in reducing OHSS. But GnRH-a trigger induced increased luteal insufficiency and cycle cancellation. A dual trigger (HCG with GnRH-a) was introduced to reduce OHSS, luteal insufficiency and cycle cancellation. This study was designed to compare the effect of dual trigger on final oocyte maturation n embryo quality with conventional HCG trigger and GnRH-a trigger. Method: We conducted this retrospective cohort study of patients who underwent IVF antagonist cycles from Jan. 2020 to Dec. 2022. Patients undergoing their oocyte retrieval 36 hours after trigger with only HCG 10,000 units, or only leuprolide acetate 40 units, or a dual trigger of HCG 5000 units with leuprolide acetate 40 units. Male factor infertility and oocyte donor cycle were excluded. The main outcomes were retrieved mature oocyte rate and fertilization rate. Secondary outcomes include implantation rate and pregnancy rate. Results: Total 3266 patients were included. Dual trigger was in 2279, GnRH-a in 282 and HCG in 705 cycles. Patients using GnRH-a were younger (33.7± 4.0 years) compared to those receiving dual trigger (37.8±2.3 years) and HCG only (37.2±3.2 years) (p<0.01). Because GnRH-a groups were younger, despite low total gonadotropin dose, the larger number of oocytes were retrieved. Dual trigger resulted in no difference in mature oocyte ratio, compared to HCG trigger and GnRH-a trigger (63.0%, 58.3%, 62.8% p: 0.074). Analysis did not show any statistical differences in fertilization rate between the types of triggering methods. Cycel cancellation due to no oocyte recovered from multiple follicles aspirated was shown only in GnRH-a cycle (6 cases. 2.1%). Conclusion: Compared to HCG trigger and GnRH-a trigger, the dual trigger showed no difference in mature oocyte rate and fertilization rate. To reduce OHSS and cycle cancellations, dual trigger could be considered the standard care in IVF without decreasing oocyte quality.