卵细胞胞质内单精子注射在前次常规体外受精失败病例中的应用

目的:探讨卵细胞胞质内单精子注射(ICSI)是否可以改善由于受精障碍导致不孕病例的妊娠结局。方法:回顾性分析2002年1月~2004年12月由于第1周期的常规体外受精(IVF)治疗中卵子完全不受精或受精率≤20%,而在随后的治疗周期中采取ICSI方法受精的20个病例(共22个周期,研究组)的ICSI治疗结局。对照组为同期因男方少弱精子进行第1次ICSI治疗的连续100个周期。结果:与前次IVF相比,经ICSI治疗后受精率从5.4%显著提高至76.9%(χ2=264.66,P<0.001),但研究组中低受精患者经ICSI治疗后的受精率67.9%,明显低于对照组的77.5%(χ2=5.18,P<0.05)和研究组中完全不受精患者的84.2%(χ2=8.97,P<0.05)。研究组中完全不受精患者的妊娠率和胚胎种植率分别为57.1%和40.5%,均高于对照组的35.0%和18.9%,但仅胚胎种植率的差异有显著性意义(χ2=8.80,P<0.01)。结论:ICSI可以有效地克服受精障碍,提高受精率,并且可明显改善妊娠结局。

Clinical Analysis of Intracytoplasmic Sperm Injection in Patients with Previous Fertilization Failure after Conventional IVF

OBJECTIVE: To analyze the clinical outcome of intracytoplasmic sperm injection (ICSI) in patients with previous fertilization failure after conventional IVF. METHODS: Data from 20 ICSI cases (22 ICSI cycles) with previous complete failure of fertilization or with fertilization rate < or = 20% between January 2002 and December 2004 were retrospectively analyzed. The control group consisted of 100 consecutive ICSI cycles for male factor infertility in the same period. RESULTS: The fertilization rate dramatically increased from 5.4% after conventional IVF to 76.9% after ICSI treatment (chi-squared = 264.66, P < 0.001). However, the fertilization rate in the subgroup with previous low fertilization was significantly lower than those in the control and in the subgroup without previous fertilization (67.9% vs 77.5%, 67.9% vs 84.2%). Compared with the control group, the subgroup without previous fertilization had a higher pregnancy rate and implantation rate, but only the difference in the implantation rate was statistically significant (40.5% vs 18.9%). CONCLUSION: ICSI can overcome previous fertilization failure with conventional in vitro fertilization and thus improve the clinical outcome.