FERTIL STERIL:胚胎移植能否活产原因并不单一,是时候重新定义复发性移植失败了!

2021-11-05 MedSci原创 MedSci原创

在胚胎非整倍体以外的因素引起着床失败(着床失败的主要原因)时,不应称为复发着床失败。

辅助生殖技术(ART)周期有四个组成部分:提供多个配子的卵巢刺激阶段、受精和胚胎发育的实验室程序阶段、胚胎移植和黄体期支持阶段。在任何步骤的不佳表现都会降低着床和活产的机会。其中,胚胎非整倍体(EA)是最常见的ART失败原因,胚胎非整倍体是胚胎发育停滞、植入失败和流产的主要原因。

即使在没有任何其他不利因素影响这一过程的情况下,期望每个移植胚胎都被植入并达到活产是不现实的,因为几乎一半的胚泡是非整倍体,因此,在数个胚胎未能获得活产后,植入失败应该成为一个关注点。但有多少移植胚胎未能植入以诊断为复发性植入失败(RIF)呢?

有研究者通过观察在不存在影响着床的任何其他因素的假设下,达到95%累积着床概率所需的囊胚数量,来建立数据模型,并以此提出了复发性着床失败的定义,解释了女性年龄和预期囊胚整倍体率对累积着床率的影响。

上面这张图可以清楚的看到当移植胚胎的整倍体状态未知时(即未经PGT-A测试)35岁以下的女性在移植7个胚泡后至少植入一个胚泡的累积概率达到95%,整倍体胚胎植入率在45%和55%之间(图A和B),在移植6个胚泡后,整倍体胚泡植入率为65%(图C)。对于老年患者,达到相同阈值所需的囊胚数量较高。例如,38岁以上的女性需要转移10个以上的囊胚,以满足95%的阈值概率上限,而在所有植入率假设中,对于42岁以上的女性来说,这一数字是不切实际的大。

假设胚胎是已知的整倍体时,这些数字会发生显著变化。如果假定整倍体胚泡的植入率为55%,那么3个和4个胚泡就足以分别达到大于90%和95%的累积概率。

因此,通过实验数据可以得知,当移植胚胎的整倍体状态未知时(即未进行非整倍体植入前遗传学检测),研究者的模拟显示,在移植七个胚泡之前,年龄类别至少有一个胚胎植入的累积概率不超过95%。对于老年患者,达到相同阈值所需的囊胚数量较高。例如,38岁以上的女性需要移植10个以上未经测试的囊胚,以达到95%的预测概率上限。另一方面,如果假定整倍体胚泡的植入率为55%,那么无论年龄大小,4个胚泡都足以达到大于95%的累积概率。

“复发性植入失败”应该是一个功能性术语,指导进一步的治疗。

因此,研究者建议,在胚胎非整倍体以外的因素引起着床失败(着床失败的主要原因)时,不应称为复发着床失败。由此提出了一个新的定义,该定义涉及不同女性年龄、整倍体胚泡着床率和着床累积概率的特定阈值等因素,因为任何不考虑移植胚胎整倍体状态或收集卵母细胞时女性年龄的RIF定义都是不完整和不准确的。

参考文献:Baris Ata, Erkan Kalafat, Edgardo Somigliana, A new definition of recurrent implantation failure on the basis of anticipated blastocyst aneuploidy rates across female age, Fertility and Sterility, Volume 116, Issue 5, 2021, Pages 1320-1327, ISSN 0015-0282, https://doi.org/10.1016/j.fertnstert.2021.06.045.

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    2021-11-22 ms2000000637474384

    具有探导意义

    0

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    2021-11-22 ms2000000637474384

    这篇文章好

    0

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    2021-11-07 ailian1202
  6. [GetPortalCommentsPageByObjectIdResponse(id=1949334, encodeId=cd201949334ff, content=<a href='/topic/show?id=5ed95833172' target=_blank style='color:#2F92EE;'>#新定义#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=30, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=58331, encryptionId=5ed95833172, topicName=新定义)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6ab940, createdName=hukaixun, createdTime=Wed Jun 01 23:45:47 CST 2022, time=2022-06-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1909927, encodeId=b653190992e45, content=<a href='/topic/show?id=8f1f42518d8' target=_blank style='color:#2F92EE;'>#复发性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=42518, encryptionId=8f1f42518d8, topicName=复发性)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=hb2008ye, createdTime=Tue Aug 30 13:45:47 CST 2022, time=2022-08-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1073007, encodeId=024510e300791, content=具有探导意义, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=78db5723254, createdName=ms2000000637474384, createdTime=Mon Nov 22 23:11:22 CST 2021, time=2021-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1073006, encodeId=95b910e3006bc, content=这篇文章好, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=78db5723254, createdName=ms2000000637474384, createdTime=Mon Nov 22 23:09:56 CST 2021, time=2021-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1315485, encodeId=d49513154856a, content=<a href='/topic/show?id=6fcc83e0554' target=_blank style='color:#2F92EE;'>#胚胎#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=83705, encryptionId=6fcc83e0554, topicName=胚胎)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6393434, createdName=ailian1202, createdTime=Sun Nov 07 10:45:47 CST 2021, time=2021-11-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1514583, encodeId=94a7151458375, content=<a href='/topic/show?id=690283e36cb' target=_blank style='color:#2F92EE;'>#胚胎移植#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=42, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=83736, encryptionId=690283e36cb, topicName=胚胎移植)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=8a9910663000, createdName=ms2694732865965676, createdTime=Sun Nov 07 10:45:47 CST 2021, time=2021-11-07, status=1, ipAttribution=)]