注射hCG后不同时间行宫腔内人工受精对妊娠率的影响

目的:探讨注射hCG后不同时间行宫腔内人工受精(Intrauter ineinsemination,IUI)对妊娠率的影响。方法:回顾性分析同济医院生殖中心472对夫妇实施IUI治疗的561个周期。根据注射hCG后行IUI的不同时间分为2组:hCG后24h IUI组和36h IUI组,比较两组IUI后的排卵时间及其对妊娠率的影响。结果:hCG后24h IUI359个周期和hCG后36h IUI202个周期的妊娠率分别为10.86%、10.89%,P>0.05,差异无统计学意义;两组24h内排卵的344个周期妊娠率为13.08%,明显高于24h内未排卵的217个周期妊娠率7.37%,P<0.05,差异有统计学意义。结论:影响IUI结局的因素并非注射hCG后IUI的时间,而是IUI后的排卵时间,距排卵时间越近妊娠率越高。阴道B超联合尿LH半定量试纸检测可以较准确预测排卵时间,有利于提高其周期妊娠率。     

1136周期宫腔内夫精人工授精临床因素的分析

目的:对影响宫腔内夫精人工授精(Intrauterine insemination,IUI)妊娠率的因素进行分析。方法:对接受夫精宫腔内人工授精治疗的651例不孕患者1 136周期的临床资料进行回顾性分析,主要分析不同的促排卵方案、IUI周期数、子宫内膜形态、内膜厚度等与妊娠率的关系。结果:1 136周期的IUI中妊娠周期93周期,周期妊娠率8.19%;<30岁、30～35岁,和>35岁妊娠率分别是8.80%、7.69%和5.42%;不同的促排卵方案(CC、hMG/hCG、hCG)的妊娠率分别为10.00%、9.00%和7.46%;hCG日内膜厚度为<8 mm、8～14 mm、>14 mm,妊娠率分别为5.61%、8.70%和12.70%;hCG日或出现LH峰当日子宫内膜形态为A型、B型、C型时,妊娠率分别是9.63%、4.55%和8.00%;重复周期IUI对提高妊娠结局差异无统计学意义。结论:施行IUI女方的年龄是影响IUI妊娠率的主要因素;多次重复周期IUI并不能显著改善妊娠结局;不同促排卵方案的妊娠结局差异无统计学意义。     

Intrauterine insemination with conjoint semen. How to increase the success rate?

BACKGROUND: Intrauterine insemination is usually proposed as the first line therapy for infertility related to cervical hostility, male factor, unexplained infertility or mild endometriosis. The overall succes rate of IUI is about 10-20% clinial pregnancy per cycle. The Aim of this study is to evaluate factors that increase the succes rate of IUI. METHODS: we restrospectively analysed 206 cycles of IUI with partner's semen in 138 infertile couples. The clinical and laboratory factors that may influence the pregnancy rates were analysed: women's age, etiology of infertility, duration of infertility, ovarian stimulation, day of hCG and sperm parametres. RESULTS: The per-cycle clinical pregnancy rate was of 14.56%. Optimal pregnancy rates were observed in less than 38 years old women (18.29% vs 9.52%, p<0.05). The succes rate was statistically depending of the number of IUI cycles until three (p<0.05), the day of hCG (p<0.05) and the sperm count after conventionally prepared semen (p<0.05). Sperm parameters was of no value in predecting the pregnancy rates, and neither seam's to be the total dose of administrated Gonadotrophin or the etiology of infertility, but it seams that, when a cervical factor or PCO were involved, the succes rate is higher. Besides, getting three or more than three follicles may increase the succes rate but expose to a warrying risk of multiple pregnancy. CONCLUSION: According to this study, the only statitically significant factors that are associated with successful IUI were, women partner's age (<38 ans), number of IUI cycles (during the first three IUI cycles), day of hCG (>J13) and sperm count after conventional semen preparation (>1.106/mL).     

宫腔内人工授精成功率的影响因素分析

目的分析影响宫腔内人工授精(intrauterine insemination,IUI)成功率的相关因素。方法回顾性分析2013~2014年北京市海淀区妇幼保健院生殖中心1 659个IUI周期的患者年龄、不孕年限、不孕类型、自然周期或促排卵周期、子宫内膜厚度、排卵数、IUI的时机、洗精前后前向运动精子数、IUI的周期数与妊娠结局的关系。结果 IUI治疗妊娠率与患者年龄、子宫内膜厚度、IUI治疗周期数、排卵数及洗精前前向运动精子数有关(P0.05);与不孕类型、自然周期或促排卵周期、IUI时机、洗涤后前向运动精子数无关(P0.05)。结论影响IUI结局的主要因素是:子宫内膜厚度、患者年龄、IUI治疗周期数、排卵数及洗涤前前向运动精子数。     

少弱畸形精子优选后体外生存时间与宫腔内人工授精妊娠率的对比研究

为比较研究少弱畸形精子优选后体外生存时间与宫腔内人工授精(IUI)妊娠率的关系。选择因男方患少弱畸形精子症致不孕者。以改良F10培养液为精子培养液,采用上泳分离法体外处理精子后,置36.5℃二氧化碳培养箱中,分别于0,9,12,24,36,48h观察其精子活率和活力,活率≥50％者为阳性,活率<50％者为阴性。结果以生存时间(SST)表示。宫腔内人工授精按常规操作进行。共治疗60例,137个周期,妊娠19例,总妊娠率为31.7％(19/60),周期妊娠率为13.8％(19/137)。其中 SST 9h阳性5例,无一例妊娠,12h阳性10例,2例妊娠(20％),24h阳性16例,4例妊娠(25％),36h阳性29例,13例妊娠(44.8％),48h精子生存试验结果显示阴性,优选后精子体外生存时间对预测IUI妊娠率有重要临床价值,即SST为36h,人工授精妊娠率明显增高。     

不同促排卵方案联合宫腔内人工授精的疗效观察

目的探讨克罗米酚（CC）、来曲唑（LE）以及人绝经期促性腺激素（HMG）3种促排卵方案联合官腔内人工授精（IUI）的临床妊娠结局。方法选择2011年10月至2012年9月因排卵障碍、多囊卵巢综合征、卵泡发育不良及卵巢储备功能下降等原因在泰州市人民医院接受IUI治疗的98例不孕症患者（共计157个治疗周期）为研究对象,并对其临床病历资料进行回顾性分析。按照不同的促排卵药物,将其分别纳人CC组（n=36,共计60个治疗周期）、LE组（n=34,共计55个治疗周期）和HMG组（n=28,共计42个治疗周期）。比较3组患者在肌肉注射人绒毛膜促性腺激素（hCG）日的优势卵泡数和大小、注射hCG日子宫内膜厚度、临床妊娠率、多胎率、自然流产率及重度卵巢过度刺激综合征发生率等。本研究遵循的程序符合泰州市人民医院人体试验委员会制定的伦理学标准,得到该委员会批准,分组征得受试对象的知情同意,并与之签署临床研究知情同意书。结果LE组患者注射hCG日子宫内膜厚度显著高于CC组和HMG组,组间比较,差异均有统计学意义（t=9．329,-6．256;P〈0．05）,CC组和HMG组患者注射hCG日子宫内膜厚度比较,差异无统计学意义（t=1．304,P〉0．05）。HMG组患者在注射hCG日优势卵泡数与CC组和LE组比较,差异有统计学意义（t=-1．137,-1．18;P〈0．05）,而CC组和LE组患者注射hCG日优势卵泡数比较,差异无统计学意义（t=0．704,P〉0．05）。结论LE在改善子宫内膜厚度上优于CC和HMG,而HMG在促进卵泡发育方面优于CC和LE。     

EFFECTS OF SEMEN CHARACTERISTICS ON IUI COMBINED WITH MILD OVARIAN STIMULATION

To determine the influence of sperm parameters inseminated on the outcome of intrauterine insemination (IUI) in patients undergoing ovarian stimulation with clomiphen citrat (CC) or human menopausal gonadotropin (HMG) therapy, a retrospective review was performed for 2 years on data from the IUI program. 190 couples underwent a total of 268 IUI cycles in which CC or HMG was used for ovulation induction. The initial sperm concentration (mil/ml), motility (percent), preprocessing total motile sperm (TMS) count (million), fast motile sperm (percent) and postprocessing sperm concentration (mil/ml), motility (percent), TMS count, fast motile sperm (percent), sperm morphology, hypoosmotic swelling (HOS) scores, semen leuocytes, and bacteria were analyzed. 268 inseminations were followed by a pregnancy rate of 12% and couple pregnancy rate of 17%. On multivariable logistic regression analysis, total motile sperm (TMS) count, percent motility, and percent of fast motile sperm were independent prognostic factors of fertility. The impact of the preprocessing and postprocessing sperm parameters on pregnancy outcome after IUI was evaluated. There was a trend toward an increasing percent of conception with increasing TMS count, motility, and percent of fast motile sperm. The TMS count, motility and percent of fast motile sperm independently predict success with IUI. Patients with original sperm motility ≥30% had a higher cumulative pregnancy rate (74%) than patient with motility <30% (p < 0.005). Pregnancy rate increased 4 times with motility of ≥30%.     

影响宫腔内人工授精治疗结果的因素探讨

目的:探讨影响宫腔内人工授精(IUI)治疗结果的因素,以提高IUI治疗的临床效果。方法:对415个IUI治疗周期的240例患者的年龄、不孕年限、不孕原因、精液处理方法和处理后精子情况、IUI治疗周期数、一个周期内2次IUI以及促排卵方案与治疗结果的关系进行分析。结果:患者的年龄、处理后精子情况、IUI周期数和促排卵药物的使用与治疗结果有关;精液处理方法、一个周期内2次IUI和不同的促排卵方案对治疗结果没有影响。结论:患者的年龄、处理后精子情况、IUI周期数和促排卵药物的使用是影响IUI治疗结果的重要因素;一个周期内2次IUI和增加IUI的治疗周期数无法提高IUI治疗的临床妊娠率。     

不明原因不孕夫妇行IVF-ET时机的探讨

目的 :探讨对不明原因不孕妇女进行辅助生殖技术的最佳时机及方法。方法 :将 2 5 6例不明原因的不孕妇女分成 A、 B、C3组 ,A组为经历 1～ 3个 COH/ IUI周期的妇女 2 5 6人 ,共 475周期。B组为经历第 4、第 5、第6 COH/ IUI周期的妇女 41人 ,共 74周期。C组为经历前 3个 COH/ IUI周期失败后 ,进行 IVF和 ICSI治疗 1周期的5 9人。结果 :A组 75人获得妊娠 ,平均每周期妊娠率为 15 .8%,累积妊娠率为 2 9.2 %。B组 4人获得妊娠 ,平均每周期的妊娠率为 5 .4%,累积妊娠率为 38.9%,与 A组相比妊娠率明显降低 ,有统计学上的差异 ( P<0 .0 5 ) ,进一步增加的妊娠率为 9.7%。C组 2 2人获得妊娠 ,妊娠率为 37.2 %,明显高于 B组 ,有统计学上的差异 ( P<0 .0 1)。结论 :对于原因不明的妇女首先应进行 COH/ IUI周期治疗 ,当 3周期 COH/ IU I失败后 ,应进行 IVF和 ICSI治疗。     

夫精宫腔内人工授精手术时机和妊娠相关性分析

目的：探讨夫精宫腔内人工授精（IUI）时机及次数与妊娠率的关系。 方法：回顾性分析851对在广州医科大学附属第三医院行夫精IUI治疗的不孕夫妇（共1 751个周期）,根据手术时机及次数,分为排卵前1次IUI、排卵后1次IUI、排卵前2次IUI、排卵前后各1次IUI 4组,比较4组妊娠率的差异。 结果：排卵前、后行单次IUI组的妊娠率分别为11.21%和12.23%;排卵前行单次IUI后有排卵组妊娠率显著高于无排卵组（P＜0.05）。排卵前后各行1次IUI、排卵前行2次IUI妊娠率分别为16.21% 和15.65%;排卵前行2次IUI后有排卵组临床妊娠率（17.14%）高于无排卵组（0.00%）,差异有统计学意义（确切概率法 P=0.040）。有排卵周期中,排卵前1次、排卵后1次、排卵前2次、排卵前后各1次IUI的临床妊娠率分别为10.99%、12.23%、17.14%、16.21%,行2次IUI组的妊娠率虽然高于行1次IUI组,但差异无统计学意义（P＞0.05）。 结论：只要确定卵泡破裂,排卵前后行IUI、行1次或2次IUI妊娠率无差异;但IUI后卵泡无破裂,则妊娠率为0～2.85%,因此针对2个周期IUI出现未破裂卵泡黄素化综合征者建议转行体外受精。     

宫腔内配子移植治疗黄素化未破裂卵泡综合征所致不孕症疗效观察

目的:观察宫腔内胚子移植(GIUT)治疗黄素化未破裂卵泡综合征(LUFS)所致不孕症的临床疗效。方法:对23例LUFS所致不孕症患者进行36个周期的GIUT,采用自然周期或小剂量氯米芬微刺激方案促排卵,阴道B超监测卵泡的生长情况,当有1个以上卵泡直径≥18或2个以上卵泡直径≥16时肌内注射人绒毛膜促性腺激素(HCG)5 000 IU,24～36 h内取卵实施宫腔内胚子移植。结果:36个周期GIUT中,临床妊娠7例,周期妊娠率19.44%,生化妊娠1例,36个周期中未发生宫外孕、双胎妊娠及卵巢过度刺激综合征(OHSS)。结论:GIUT治疗卵泡未破裂黄素化综合征所致不孕症有一定疗效,且程序简化,价格低,值得基层推广应用。     

宫腔内人工授精治疗子宫内膜异位症不孕临床效果的影响因素分析

目的:探讨宫腔内人工授精(IUI)治疗子宫内膜异位症((EMS)不孕临床效果的影响因素。方法:收集2008年1月~2014年1月在本科就诊的100例EMS不孕患者205周期IUI资料,比较EMS生育指数(EFI)和IUI术前促性腺激素释放激素激动剂(GnRH-a)预处理(GnRH-a组112周期,非GnRH-a组93周期)及治疗方案[自然周期组11周期,促排卵周期组194周期;促性腺激素(Gn)组139周期,非Gn组55周期]对临床妊娠率的影响。结果:EFI≥9分的EMS不孕患者IUI妊娠周期率及累积妊娠率分别为21.1%和40.0%,显著高于EFI≤8分的患者(分别为9.3%和20.0%),差异均有统计学意义(P0.05);自然周期组与促排卵周期组周期妊娠率分别为0和14.4%;GnRH-a组与非GnRH-a组周期妊娠率分别为16.1%和10.8%,差异无统计学意义(P0.05);Gn组与非Gn组周期妊娠率分别为15.8%和10.9%,双胎妊娠率分别为13.6%和16.7%,差异均无统计学意义(P0.05)。结论:EFI≥9分的EMS不孕患者腹腔镜术后应积极采用IUI助孕治疗,IUI治疗前不建议使用GnRH-a等药物进行预处理,促排卵联合IUI可以提高患者的妊娠几率。     

Results of intrauterine insemination in the Netherlands

OBJECTIVE: To assess the results of intrauterine insemination (IUI) in the Netherlands. DESIGN: Retrospective. METHOD: Based on annual reports and individual reports from gynaecologists, we calculated the number of registered IUI cycles performed, the pregnancy rates per cycle, the ongoing pregnancy rates per cycle and the multiple pregnancy rates per ongoing pregnancy in 2003. By extrapolating these results, we estimated the total number of IUI cycles performed in 2003 in the Netherlands and the related outcomes. These results were compared with IUI pregnancy rates from the international literature and Dutch national data on in vitro fertilisation (IVF). RESULTS: In 2003, IUI was performed in 91 of the 101 hospitals in the Netherlands. Of these 91 hospitals, 58 (64%) registered their IUI results. These 58 hospitals performed 19,846 IUI cycles in 2003. The mean pregnancy rate per cycle was 9.0% and the ongoing pregnancy rate per cycle was 7.3%. Multiple pregnancies occurred in 9.5% of ongoing pregnancies. Extrapolation of the data of these 58 hospitals revealed that approximately 28,500 IUI cycles were performed in the Netherlands in 2003, of which approximately 2,000 resulted in an ongoing pregnancy. The number of multiple pregnancies following IUI was estimated to be 180 (9.0%). In the international literature, a pregnancy rate per cycle of 8.7% has been reported. According to the national IVF registry, 9,761 IVF cycles were started in 2003, resulting in 2,028 ongoing pregnancies (20.8% per cycle) and 439 twin pregnancies (21.6% per ongoing pregnancy). CONCLUSION: The pregnancy rate per IUI cycle in the Netherlands (9.0%) was comparable to that reported in the international literature (8.7%). The contribution of IUI to the number of multiple pregnancies in the Netherlands was much smaller than the contribution of IVF.     

The Impact of laparoscopic surgery of peritoneal endometriosis and endometrioma on the outcome of ICSI cycles

Our objective was to assess the role of laparoscopic removal of ovarian endometriomas and ablation of peritoneal endometriosis on the outcome of intracytoplasmic sperm injection (ICSI) - Embryo Transfer cycles by comparing with the results of patients with untreated endometriomas and tubal factor without underlying endometriosis confirmed by laparoscopy. For this purpose, between 2002 and 2015, outcomes of 257 ICSI cycles of 150 patients, including 91 cycles of 48 patients in minimal endometriosis, 57 cycles of 25 patients in endometrioma removal, 65 cycles of 53 patients in non-operated endometrioma, and 44 cycles of 24 patients in tubal factor groups were retrospectively analyzed. Basal ovarian reserve was significantly lower, mean starting and total gonadotropin consumption was significantly higher, and mean serum E2 on the day of hCG injection, number of dominant follicles, number of retrieved total, and MII oocytes were all significantly lower in the endometrioma cystectomy group. Fertilization and embryo cleavage rates were also significantly the lowest in the endometrioma cystectomy group, whereas clinical pregnancy and live birth rates were comparable among all groups. The number of transferred embryos and duration of infertility were the most significant predictors of clinical pregnancy and live birth. Basal antral follicle count was also significant in predicting live birth.     

VIABILITY AND FECUNDITY OF HUMAN SEMEN SPECIMENS CRYOSTORED AND TRANSPORTED AT 5°C USING THE BIO–TRANZTM SHIPPING

This study was designed to assess the viability and fecundity of semen stored at 5°C for 24 hours using the Bio-Tranz^TM shipping system. Semen specimens were assessed for motility and sperm membrane integrity at the time of collection and 24 hours after storage in the Bio-Tranz^TM. In group 1 (n = 61), specimens were diluted in TYB, processed and used for intrauterine insemination (IUI), leaving an aliquot for storage for 24 hours in the Bio-Tranz^TM. In group 2 (n = 67), specimens were diluted in TYB, stored for 24 hours in the Bio-Tranz^TM and then processed and used for IUI. In both groups, the total motile sperm used for IUI was similar and the women that underwent IUI were standardized for ovulation prediction and time of insemination. The overall sperm characteristics between the two groups were within normal range. Significant decreases were noted in sperm motility and membrane integrity in both groups after storage. Similar pregnancy rates were obtained between the two patient populations. The use of the Bio-Tranz^TM shipper is extremely convenient for patients requiring semen evaluation, cryostorage or IUI and other assisted reproductive technologies.     

209周期宫腔内人工授精的临床分析

目的:比较不同治疗方案对宫腔内人工授精(IUI)结局的影响,探讨较好的治疗方案以提高IUI的成功率。方法:回顾性分析了162例病人209个IUI治疗周期的治疗方案,根据病人用药情况分为3组:自然周期/IUI组、尿促卵泡素(hMG/IUI)组、克罗米芬(CC)+补佳乐/IUI组,比较各组病人在注射hCG日的子宫内膜厚度、卵泡发育情况、及妊娠结局等。结果:在162例病人中,有20例获得临床妊娠,临床妊娠率为12.34%,周期妊娠率为9.56%;3组病人的年龄、不孕年限,体重指数(BM I)及基础FSH、血清黄体生成素(LH)值、E2无差异;促排卵后,CC+补佳乐/IUI、hMG/IUI组病人的卵泡数高于自然周期组,子宫内膜厚度在自然周期组和hMG/IUI组明显高于CC+补佳乐/IUI组,有极显著性差异,P<0.01;妊娠结局3组分别为9、5、6。结论:IUI是治疗非输卵管因素不孕的一种有效方法,并且自然周期情况下,病人体内激素环境更接近于生理状况,能获得较好的妊娠结局。     

Early experience with gamete intrafallopian transfer (GIFT) and direct intraperitoneal insemination (DIPI).

We present our early experience with gamete intrafallopian transfer (GIFT) and direct intraperitoneal insemination (DIPI) combined with intrauterine insemination (IUI), two recently described methods of assisting conception in patients with patent fallopian tubes. Sixty-nine patients (93 cycles) were entered into the study. Thirty-three patients (51 cycles) entered the DIPI/IUI programme and 36 patients (42 cycles) entered the GIFT programme. The mean age, duration and aetiology of infertility were similar in both groups. In the GIFT programme 12 pregnancies occurred, which is a 29% pregnancy rate per cycle and a 33% pregnancy rate per patient. In the DIPI/IUI programme only 3 pregnancies occurred, being a 6% pregnancy rate per cycle and a 9% pregnancy rate per patient. With the live birth rate of in vitro fertilization (IVF) being 12% per embryo transfer, we conclude that GIFT is more successful than either DIPI/IUI or IVF in patients with patent fallopian tubes. Further controlled studies are required to assess the future role of DIPI/IUI in clinical practice.     

克罗米芬+补佳乐在IUI中的临床应用探讨

目的观察克罗米芬+补佳乐在宫腔内人工授精中的应用,探讨影响克罗米芬的作用因素以提高IUI的成功率;方法回顾性分析了50例病人56周期IUI治疗方案,总结了不同年龄病人用药情况及用药后在注射hCG日病人的子宫内膜厚度、妊娠结局等;结果在57周期克罗米芬+补佳乐/IUI治疗中,妊娠有6例,临床妊娠率为12%,周期妊娠率为10.7%;其中1例为异位妊娠,1例早期流产;结论克罗米芬+补佳乐可改善子宫内膜的厚度,有利于胚胎着床,结合IUI能取得较好的妊娠结局。     

The relationship between the changes in the level of progesterone and the outcome of in vitro fertilization-embryo transfer

Abstract

We observed the effects of changes in progesterone (P) during late follicular phases on the treatment outcome of in vitro fertilization-embryo transfer (IVF-ET) and intracytoplasmic sperm injection (ICSI) in patients with different ovarian responses. The data of 8,575 cycles of patients receiving gonadotropin-releasing hormone (GnRH) agonist using the long protocol were retrospectively analyzed. According to the number of oocytes retrieved, the cycles were divided into poor ovarian response group (oocyte retrieval <5), intermediate ovarian response group (5≤ oocyte retrieval ≤15), and high ovarian response group (oocyte retrieval ≥16). We found that in the poor ovarian response group, the clinical pregnancy rate was not significantly associated with both the level of P or the day of human chorionic gonadotrophin (hCG) and the duration of pre-hCG P elevation (p?=?0.66 and p?=?0.1874). In intermediate and high ovarian response groups, the clinical pregnancy rate was inversely related to both the level of P on the day of hCG administration and the duration of pre-hCG P elevation (all p?<?0.0001). The cut-off values of serum P level on the day of hCG administration were 1?ng/ml and 1.75?ng/ml in intermediate and high ovarian response groups, respectively. The cut-off values of pre-hCG P elevation duration were obtained on day 1 in the intermediate ovarian response group, and days 1 or 3 in the high ovarian response group. After correcting for other confounding factors, multivariate logistic regression analysis indicated that P level on the day of hCG administration was not associated with clinical pregnancy rates, but pre-hCG P elevation duration was negatively associated with clinical pregnancy rate in the intermediate and high ovarian response groups. P level is associated with clinical pregnancy rate only in the patients with intermediate or high ovarian response. The longer the duration of pre-hCG P 1?ng/ml, the lower the clinical pregnancy rate.     

下丘脑垂体性闭经应用HMG联合小剂量hCG促排卵成功妊娠4例分析及文献回顾

目的：探讨下丘脑垂体性闭经患者应用人绝经期促性腺激素（HMG）联合小剂量人绒毛膜促性腺激素（hCG）的促排卵疗效。方法：对4例下丘脑垂体性闭经患者HMG联合小剂量hCG促排卵和单纯应用HMG促排卵进行比较,观察血清激素水平、卵泡生长发育及妊娠结局。结果：4例患者应用HMG联合小剂量hCG 8个周期和单纯应用HMG促排卵4个周期比较,新方案优势卵泡数1～4个,周期妊娠成功率50%,无卵巢过度刺激综合征发生,均成功足月分娩。结论：HMG联合小剂量hCG促排卵能够安全有效地应用于下丘脑垂体性闭经的患者,可减少优势卵泡的数目,减少多胎风险。由于例数较少,尚需大规模临床试验进一步证实。