Alz Res Therapy:MRI新方法,有助于区分阿尔兹海默症和额颞叶痴呆

2021-11-05 Freeman MedSci原创

AD、FTD和正常老年人的脑萎缩显示出不同的模式

额颞叶痴呆(FTD)是65岁以下人群痴呆的主要原因之一,占神经退行性痴呆的近20%。FTD的临床症状与其他类型的痴呆症、精神疾病或帕金森病重叠。阿尔茨海默病(AD)是最常见的痴呆类型,往往难以与FTD相区别,尤其是在早期阶段。

目前,还没有针对FTD的疾病修饰疗法。广泛用于AD患者的乙酰胆碱酯酶抑制剂可能会导致FTD患者的症状恶化。因此,对FTD和AD的准确诊断可以避免治疗结果的严重后果。除了临床实践外,减少误诊对临床试验的区分也很有帮助。

结构性磁共振成像(sMRI)是诊断痴呆症的一种常见的非侵入性检查。与计算机断层扫描、正电子发射断层扫描和先进的MRI序列相比,sMRI的优势在于可广泛使用、无电离辐射或核辐射、可客观地观察到脑萎缩,并具有良好的组织对比。

在临床实践中,神经科医生和放射科医生使用各种视觉评分表来评估MR图像中的脑萎缩程度。尽管执行起来很方便,但视觉评分具有很强的主观性,并依赖于经验,在实践中很容易导致误诊和漏诊。

最近,人们对神经退行性疾病的自动大脑分割、定量分析和机器学习进行了大量的研究。然而,大量基于机器学习的分类高度依赖于有限的训练数据和缺乏基本的临床理由。因为临床医生很难理解这些人工智能方法是如何以及为什么做出某种决定的,缺乏可解释性限制了它们在临床实践中的适用性。

其次,大多数研究是基于单一中心的样本,由于诊断标准、影像参数和患者的社会人口学特征的异质性,可能无法转化为其他中心的研究。最后,许多研究只关注AD与行为变异性额颞叶痴呆(bvFTD)的区别。

但事实上,由于存在轻度或重叠的语言障碍,有语言障碍的AD也可能与FTD的亚型相混淆,如原发性进行性失语症(PPA),包括语义变异性PPA(svPPA)和非流利变异性PPA(nfvPPA)。因此,如果AD能与FTD谱系障碍区分开来,在理论上是可取的,在实践上是有意义的。

藉此,中山大学的Qun Yu等人,从多中心数据中收集的FTD、AD和正常对照组(NC)的MRI体积和萎缩模式。基于这些发现,次要目标是得出一个专门反映FTD脑萎缩的萎缩指数,名为FTD指数(FTDI)。

在这项研究中,数据来自三个不同的数据库,包括NACC数据库中的47名FTD患者、47名AD患者和47名正常对照者;ADNI数据库中的50名AD患者;以及FTLDNI数据库中的50名FTD患者。所有受试者的MRI图像都被自动分割,并使用AccuBrain®对脑萎缩,包括AD相似性萎缩指数(AD-RAI)进行了量化。一个新的MRI指数被命名为额颞叶痴呆指数(FTDI),它是 "FTD主导 "结构的体积指数与 "AD主导 "结构的体积指数的加权和的比率。

权重和 "FTD/AD主导 "结构的识别是通过NACC数据的统计分析获得的。使用ADNI和FTLDNI数据库的独立数据验证了FTDI的区分性能。

结果。AD-RAI是一个成熟的影像学生物标志物,可以从NC中识别出AD和FTD,其数值明显高于我们之前的报道(p < 0.001,AUC = 0.88),而AD和FTD之间没有明显的差异(p = 0.647)。FTDI在从AD中识别FTD方面显示出极好的准确性(AUC=0.90;SEN=89%,SPE=75%,阈值=1.08)。使用来自ADNI和FTLDNI数据集的独立数据进行验证也证实了FTDI的功效(AUC=0.93;SEN=96%,SPE=70%,阈值=1.08)。


这个研究的重要意义在于发现了:AD、FTD和正常老年人的脑萎缩显示出不同的模式。除了旨在检测痴呆症中异常脑萎缩的AD-RAI外,还提出并验证了一个专门针对FTD的新型指数。

原文出处:the National Alzheimer’s Coordinating Center, the Alzheimer’s Disease Neuroimaging Initiative, the Frontotemporal Lobar Degeneration Neuroimaging Initiative, Yu Q, et al. An MRI-based strategy for differentiation of frontotemporal dementia and Alzheimer’s disease. Alz Res Therapy. 2021;13(1):23. doi:10.1186/s13195-020-00757-5

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    2021-11-09 我思故我在2

    很棒的软件,学习到很多知识

    0

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  5. [GetPortalCommentsPageByObjectIdResponse(id=1903429, encodeId=bcf01903429d3, content=<a href='/topic/show?id=e1b0583884b' target=_blank style='color:#2F92EE;'>#新方法#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=48, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=58388, encryptionId=e1b0583884b, topicName=新方法)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c22f171, createdName=kord1982, createdTime=Sat Jul 30 11:51:21 CST 2022, time=2022-07-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1739069, encodeId=28c51e390699a, content=<a href='/topic/show?id=6e566913df' target=_blank style='color:#2F92EE;'>#ERA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6913, encryptionId=6e566913df, topicName=ERA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=e36234488643, createdName=124988c7m106暂无昵称, createdTime=Thu Nov 11 19:51:21 CST 2021, time=2021-11-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1068647, encodeId=f92e106864ee8, content=很棒的软件,学习到很多知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=2f255526204, createdName=我思故我在2, createdTime=Tue Nov 09 17:24:07 CST 2021, time=2021-11-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1402836, encodeId=4b9114028361e, content=<a href='/topic/show?id=60ca9e761ce' target=_blank style='color:#2F92EE;'>#阿尔兹海默#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=97761, encryptionId=60ca9e761ce, topicName=阿尔兹海默)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=be952422716, createdName=habb, createdTime=Sat Nov 06 20:51:21 CST 2021, time=2021-11-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1067343, encodeId=2513106e343cd, content=临床上的具体区分方法及意义需要说清楚就更好了, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20210811/fa0f7e17ebab4be080860b325b39e57f/82b292872edb4748bdc1559c82ffb34f.jpg, createdBy=30b65535636, createdName=梅0, createdTime=Fri Nov 05 18:26:23 CST 2021, time=2021-11-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1067334, encodeId=6fc2106e33420, content=加油加油努力, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ad7e5694045, createdName=ms9000001210266530, createdTime=Fri Nov 05 17:22:08 CST 2021, time=2021-11-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1246334, encodeId=29e31246334e9, content=老年性痴呆,未来还是希望借助神经电生理吧,也许更为有效!, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=neuro.Dr, createdTime=Fri Nov 05 08:51:21 CST 2021, time=2021-11-05, status=1, ipAttribution=)]
    2021-11-05 梅0

    临床上的具体区分方法及意义需要说清楚就更好了

    0

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    2021-11-05 ms9000001210266530

    加油加油努力

    0

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    2021-11-05 neuro.Dr

    老年性痴呆,未来还是希望借助神经电生理吧,也许更为有效!

    0

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