Polypronuclear zygotes and clinical pregnancy after IVF / 中华男科学杂志

<p><b>OBJECTIVE</b>To study the relationship between the percentage of polypronuclear zygotes and clinical pregnancy following IVF.</p><p><b>METHODS</b>We collected the data of 954 IVF cycles, and according the percentage of polypronuclear zygotes in the IVF cycles, allocated them to Groups A (without polypronuclear zygotes) , B (with < 30% polypronuclear zygotes) and C (with > or = 30% polypronuclear zygotes). Then we analyzed the relationship between the percentage of polypronuclear zygotes and the rate of clinical pregnancy.</p><p><b>RESULTS</b>Compared with Group A, Group C showed a significantly lower rate of clinical pregnancy (43.2% vs 28. 1%, P < 0.05), while Group B exhibited a markedly higher rate (43.2% vs 52.36%, P < 0.05) and obviously decreased polypronuclear zygote formation with the increase of age (35.6% vs 24.1%, P < 0.05).</p><p><b>CONCLUSION</b>The percentage of polypronuclear zygotes in IVF cycles may serve as a prognostic indicator of the clinical outcome.</p>

Retrospective analysis of the clinical outcomes of repeated IVF/ICSI cycles / 中华男科学杂志

<p><b>OBJECTIVE</b>To study whether the rates of pregnancy and implantation decline in repeated IVF/ICSI cycles and whether the decline is associated with the availability of embryo cryopreservation.</p><p><b>METHODS</b>We retrospectively analyzed the pregnancy and implantation rates of 1,033 IVF/ICSI cycles accomplished in our center to determine the association of the clinical outcomes with the availability of embryo cryopreservation.</p><p><b>RESULTS</b>The rates of pregnancy and implantation declined slightly in the cycles with embryo cryopreservation (43% vs 43%, P > 0.05; 29% vs 24% , P > 0.05), but significantly in the repeated IVF/ICSI cycles without embryo cryopreservation (43% vs 35%, 43% vs 22% , P < 0.05; 29% vs 23% , 29% vs 16% , P < 0.05).</p><p><b>CONCLUSION</b>The rates of pregnancy and implantation remain similar in the following cycles for those with embryo cryopreservation in the first IVF/ICSI cycles, but decline significantly in the repeated IVF/ICSI cycles for those without.</p>

Intracytoplasmic sperm injection can improve the fertilization limitation following in vitro fertilization during previous cycles / 中华男科学杂志

<p><b>OBJECTIVE</b>To evaluate whether or not intracytoplasmic sperm injection (ICSI) can improve previous fertilization limitation on conventional in vitro fertilization (IVF).</p><p><b>METHODS</b>One hundred and thirty-six completed cycles in 113 patients with ICSI treatment were grouped. Group 1 was 106 cycles perform ICSI because of male factor, and group 2 was other 30 cycles with the history of fertilization failure and fertilization rate < 20% on conventional IVF, also assembling the cycles in group 2 according to the fertilization rate.</p><p><b>RESULTS</b>There was no significant difference between two groups in the rates of normal fertilization(70.49% vs 72.02%), good quality embryos (38.28% vs 38.81%), and clinical pregnancy (40.57% vs 40.00%) (P > 0.05). The fertilization rate of a majority of cycles (70.00%, 21/30) in group 2 was higher than 50%, and the mean of fertilization rates was 79.79%.</p><p><b>CONCLUSION</b>ICSI can improve the fertilization limitation following IVF during previous cycles, and the fertilization rates was similar to those treated ICSI because of male factor.</p>

Fertilization of in vitro matured human oocytes by intracytoplasmic sperm injection (ICSI) using ejaculated and testicular spermatozoa / 亚洲男科学杂志(英文版)

<p><b>AIM</b>To evaluate the fertilization competence of spermatozoa from ejaculates and testicle when the oocytes were matured in vitro following intracytoplasmic sperm injection (ICSI).</p><p><b>METHODS</b>Fifty-six completed cycles in 46 women with polycystic ovarian syndrome were grouped according to the semen parameters of their male partners. Group 1 was 47 cycles that presented motile and normal morphology spermatozoa in ejaculates and Group 2 was the other nine cycles where male partners were diagnosed as obstructive azoospermia and spermatozoa could only be found in testicular tissue fragment. All female patients received minimal stimulation with gonadotropin. Immature oocytes were matured in vitro and inseminated by ICSI. The spermatozoa from testes were retrieved by testicular fine needle aspiration.</p><p><b>RESULTS</b>A total of 449 and 78 immature oocytes were collected and cultured for 48 hours, 75.5 % (339/449) and 84.6 % (66/78) oocytes were matured in Groups 1 and 2, respectively. The percentage of oocytes achieving normal fertilization was significantly higher in Group 1 than that in Group 2 (72.9 % vs. 54.5 %, P 0.05). There were no significant differences in the rates of oocytes cleavage and clinical pregnancies in these two groups [87.4 % (216/247) vs. 88.9 % (32/36); 21.3 % (10/47) vs. 44.4 % (4/9)]. A total of 15 babies in the two groups were healthy delivered at term.</p><p><b>CONCLUSION</b>It appears that IVM combined with ICSI using testicular spermatozoa can produce healthy infants, while the normal fertilization rate of in vitro matured oocytes after ICSI using testicular spermatozoa was significantly lower than using the ejaculated spermatozoa.</p>