[Impact of trigger timing of gonadotropin-releasing hormone antagonist regimen for infertility patients of various ages].

Objective: To investigate the impact of trigger timing of gonadotropin- releasing hormone (GnRH) antagonist regimen for infertility patients of various ages. Methods: This was a retrospective study, 1 529 infertility patients who receiving GnRH antagonist regimen in Chongqing Health Center for Women and Children from January 2017 to December 2018 were divided into the advance trigger group and the standard trigger group, and further divided into three subgroups according to age:<35 years, 35-40 years,>40 years. The number of retrieved oocytes and transplantable embryos, the clinical pregnancy rate and the live birth rate among patients in the advance trigger group and standard trigger group in various age subgroups were compared. Results: (1) The gonadotropin (Gn) days among the three age subgroups were significantly shorter in the advance trigger group compared to the same-aged standard trigger group (all P<0.01), but only in the 35－40 years and >40 years subgroups, the Gn doses in the advance trigger group [(2 702±551) and (2 780±561) U] were significantly less than those in the standard trigger group (all P<0.01). In the <35 years subgroup, the number of oocytes retrieved and transplantable embryos of the advance trigger group (6.6±4.8 and 2.6±2.7) were significantly less than those of the standard trigger group (all P<0.01), but there was no difference in the number of top-quality embryos (P=0.580); however, in the 35－40 years and >40 years subgroups, there were no significant differences between advance and standard trigger groups in terms of the afore mentioned 3 indicators (all P>0.05), only the numbers of top-quality embryos in the advance trigger group (0.6±1.0 and 0.6±0.9) were significantly higher than those in the standard trigger group (all P<0.01). (2) In the <35 years and 35－40 years subgroups, no significant differences were noted between the advance trigger group and standard trigger group with regard to the clinical pregnancy rate and live birth rate (all P>0.05); but in the >40 years subgroup, the clinical pregnancy rate of the advance trigger group was significantly higher than that of the standard trigger group [33.0% (30/91) vs 19.2% (25/130), P=0.020], and there was no statistical difference in the live birth rate (P=0.064). (3) Multivariate logistic regression analysis showed that trigger timing was an independent predictor of clinical pregnancy rate in the >40 years subgroup (OR=0.334, 95%CI: 0.119-0.937, P=0.037), but not an independent predictor of live birth rate (P>0.05). Conclusions: Advance trigger in the GnRH antagonist protocol for infertility patients >40 years old could effectively reduce Gn times and Gn dosage, increase the number of top-quality embryos, and improve the clinical pregnancy rate. Therefore, compared with patients ≤40 years of age, patients >40 years might benefit more from advance trigger.目的： 研究接受体外受精治疗的不同年龄患者在促性腺激素释放激素（GnRH）拮抗剂方案中提前触发对临床结局的影响。 方法： 回顾性分析2017年1月至2018年12月在重庆市妇幼保健院接受GnRH拮抗剂方案体外受精治疗的1 529例不孕症患者，按照不同触发标准分为早触发组和标准触发组，并按年龄划分亚组：<35岁、35~40岁、>40岁，比较患者的促排卵及辅助生殖治疗结局情况。 结果： （1）各年龄亚组内早触发组患者促性腺激素（Gn）天数均明显短于标准触发组（P均<0.01），但仅35~40岁和>40岁患者中早触发组Gn用量［分别为（2 702±551）、（2 780±561）U］明显少于标准触发组（P均<0.01）。<35岁患者中早触发组的获卵数和可移植胚胎数［分别为（6.6±4.8）、（2.6±2.7）个］均明显少于标准触发组（P均<0.01），但优质胚胎数无显著差异（P=0.580）；35~40岁和>40岁患者中早触发组的获卵数和可移植胚胎数与标准触发组分别比较均无明显差异（P均>0.05），而优质胚胎数［分别为（0.6±1.0）、（0.6±0.9）个］明显高于标准触发组（P均<0.01）。（2）在<35岁和35~40岁患者中，早触发组的临床妊娠率和活产率与标准触发组分别比较均无显著差异（P均>0.05）；在>40岁患者中，早触发组的临床妊娠率［33.0% （30/91）］明显高于标准触发组［19.2% （25/130），P=0.020］，但活产率无显著差异（P=0.064）。（3）多因素logistic回归分析显示，提前触发仅在>40岁患者中是临床妊娠率的独立预测因素（OR=0.334，95%CI为0.119~0.937，P=0.037），但不是活产率的独立预测因素（P>0.05）。 结论： >40岁的不孕症患者在GnRH拮抗剂方案中提前触发可以有效减少Gn使用时间及Gn用量，增加优质胚胎数，提高临床妊娠率；与≤40岁的患者相比，>40岁的患者提前触发获益更多。.