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Alzheimers Dementia:新影像评分,助力认知能力预测

2021-08-12 Freeman MedSci原创

AD-PS分数是认知非障碍者发生认知障碍的较强的MRI预测因素。

尽管对来自血液和正电子发射断层扫描(PET)成像的新型痴呆症生物标志物进行了深入研究,但来自结构性磁共振成像(MRI)的生物标志物仍然是一个备受关注的领域。核磁共振成像可以捕捉到病理过程随时间推移而造成的累积性损伤,并且有下面的几个优势:
(1)比正电子发射断层成像的成本低,比获取脑脊液的侵入性低;
(2)在没有收集其他阿尔茨海默病(AD)生物标志物的大型数据库中容易获得;
(3)在淀粉样蛋白/Tau/神经退化(A/T/N)模型中描述神经退化的特征;
(4)可以定义大脑疾病的严重程度和进展情况。

基于MRI的痴呆症风险生物标志物的开发仍然是一个活跃的研究领域,不断产生新的创新。一些MRI生物标志物是由专家知识指导的。

比如,Racine及其同事提出了个性化的AD皮层厚度指数。他们使用了一个综合措施,估计为九个区域的平均皮质厚度,被认为是AD的早期目标,以预测从轻度认知障碍(MCI)到痴呆症的进展。

Brickman及其同事提出了一个退行性和脑血管病理学的指标,它与淀粉样β(Aβ)PET成像和脑脊液中总tau、磷酸化tau和Aβ1-42的水平相关,并预测了发生认知障碍。

Wu等人探究了不同的MRI指标作为社区动脉粥样硬化风险(或ARIC)队列中发生MCI和AD的风险因素的价值,报告说脑组织萎缩和血管病变都有助于ARIC的痴呆和认知障碍。这些方法的共同点是使用基于假设的综合措施,包括几个易受AD影响的脑区。一些综合指标是体积性的,另一些则是基于假设的大脑区域的皮质厚度平均值。


有人提出了基于机器学习方法的MRI数据驱动(data-driven)的生物标志物。很少有人在AD和相关痴呆症的背景下进行过系统的部署。识别早期阿尔茨海默病的空间异常模式指数,是数据驱动开放AD 风险指数的重要代表,它已经被应用于AD的不同问题。

美国Science,Wake Forest School of Medicine的 Ramon Casanova等人,利用高维机器学习方法,推出了阿尔茨海默病模式相似性(AD-PS)得分。这项工作被扩展到妇女健康倡议记忆研究(WHIMS)的MRI队列,其中AD-PS分数与新发的认知障碍、年龄和整体认知功能相关。分数与WHIMS妇女在10年的随访中的全球认知功能的相对轨迹一致。WHIMS的AD-PS分数作为衡量痴呆症的神经解剖学风险的指标,与空气污染有关联。

迄今为止,在数据驱动和假设驱动(hypothesis-driven )的MRI指数之间,特别是在不同的队列中,作为预测事件性认知障碍的指标的比较还比较少。这项工作下面几个重要目的:

(1)将AD-PS评分扩展到ARIC队列中,并评估其与不同的认知非障碍者队列中发生的认知障碍的关系。

(2)与ARIC中几个易受AD影响的脑区的假设驱动的复合体积测量相比,评估AD-PS评分的相对优势;

(3)对性别、种族和脂蛋白E基因(APOE)ɛ4携带者状态进行探索性分层分析,以评估这些因素对AD-PS评分和复合体积测量在预测事件认知损害时的影响。

他们在839名无认知障碍的人应用AD-PS分数,平均随访时间为4.86年。将这些分数和基于几个易受AD影响的脑区的假设驱动的体积测量法进行比较,作为不同情况下的认知障碍事件的预测因素。

Logistic回归分析表明,数据驱动的AD-PS分数能更加有效地预测新发的认知障碍。

在白人、女性和脂蛋白E基因(APOE)ε4携带者的参与者中,两种生物标志物对发生认知障碍的预测性都更强。

在纳入了不同领域预测因子的随机森林分析,AD-PS分数是认知障碍最相关的MRI预测因子。

这个研究的重要意义在于发现了:AD-PS分数是认知非障碍者发生认知障碍的较强的MRI预测因素。

原文出处:
Casanova R, Hsu F, Barnard RT, et al. Comparing data‐driven and hypothesis‐driven MRI‐based predictors of cognitive impairment in individuals from the Atherosclerosis Risk in Communities (ARIC) study. Alzheimer’s & Dementia. Published online July 26, 2021:alz.12427. doi:10.1002/alz.12427

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    2022-06-18 anminleiryan
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    2021-10-14 枫语Lily

    AD-PS得分具体是什么样子的呀

    0

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  6. [GetPortalCommentsPageByObjectIdResponse(id=1718047, encodeId=7e681e18047cb, content=<a href='/topic/show?id=8f0658433a' target=_blank style='color:#2F92EE;'>#dementia#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5843, encryptionId=8f0658433a, topicName=dementia)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=307e32501717, createdName=linlin2323, createdTime=Mon Mar 14 16:34:44 CST 2022, time=2022-03-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1878404, encodeId=314c18e8404f7, content=<a href='/topic/show?id=c157696175' target=_blank style='color:#2F92EE;'>#ERS#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6961, encryptionId=c157696175, topicName=ERS)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e93e105, createdName=anminleiryan, createdTime=Sat Jun 18 23:34:44 CST 2022, time=2022-06-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1779802, encodeId=21f11e7980237, content=<a href='/topic/show?id=51b4238909' target=_blank style='color:#2F92EE;'>#alzheimers#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2389, encryptionId=51b4238909, topicName=alzheimers)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=930e243, createdName=dingxiaobo, createdTime=Sun Sep 26 22:34:44 CST 2021, time=2021-09-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1060400, encodeId=ec5d106040098, content=AD-PS得分具体是什么样子的呀, beContent=null, objectType=article, channel=null, level=null, likeNumber=125, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=46445576118, createdName=枫语Lily, createdTime=Thu Oct 14 11:19:02 CST 2021, time=2021-10-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1338519, encodeId=535913385193e, content=<a href='/topic/show?id=767711566a9' target=_blank style='color:#2F92EE;'>#MERS#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=73, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11566, encryptionId=767711566a9, topicName=MERS)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdwx.qlogo.cn/mmopen/vi_32/71tKRib0PibveVjnEa7tPLMaCzoKicFlKSEOzRTGf4wNvDV54kJyNx1ott1D5Xp5gRu7IwUia77oN0YFdffvQMu6Ug/132, createdBy=9e302500146, createdName=ms49895894946433513521, createdTime=Fri Aug 13 20:34:44 CST 2021, time=2021-08-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1007171, encodeId=ac1e100e171ec, content=不错, beContent=null, objectType=article, channel=null, level=null, likeNumber=172, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=2ff25554912, createdName=ms8000001556208743, createdTime=Thu Aug 12 06:21:25 CST 2021, time=2021-08-12, status=1, ipAttribution=)]
    2021-08-12 ms8000001556208743

    不错

    0

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