Neurology:淀粉-PET诊断CAA

2017-11-09 杨中华 脑血管病及重症文献导读

皮层或软脑膜血管进展性β-淀粉沉积,比如脑淀粉样血管病(CAA),是老年人自发脑叶脑内出血和年龄相关认知功能损害的主要原因。神经病理样本或Boston标准中MRI脑叶出血的特征有助于诊断CAA,并且CAA的诊断呈逐渐增加的趋势。目前核磁作为诊断CAA的无创工具,已经被广泛应用。然而,核磁上检测到的脑局部损害仅仅是CAA的间接证据,是CAA的结果。识别早期阶段的CAA是非常困难的,比如出现MR多发病


皮层或软脑膜血管进展性β-淀粉沉积,比如脑淀粉样血管病(CAA),是老年人自发脑叶脑内出血和年龄相关认知功能损害的主要原因。神经病理样本或Boston标准中MRI脑叶出血的特征有助于诊断CAA,并且CAA的诊断呈逐渐增加的趋势。目前核磁作为诊断CAA的无创工具,已经被广泛应用。然而,核磁上检测到的脑局部损害仅仅是CAA的间接证据,是CAA的结果。识别早期阶段的CAA是非常困难的,比如出现MR多发病灶之前(主要是出血)或缺乏特征性CAA表现时。

11C-PIB PET和18F-florbetapir示踪剂PET能够检测脑血管β-淀粉沉积的负荷和部位。淀粉-PET可以发现CAA,但是其对CAA的临床诊断价值尚不清楚。为此,来自哈佛医学院的Andreas Charidimou等在Neurology上公布了他们的meta分析结果,目的在于验乞淀粉-PET诊断散发性CAA的价值和精确性。

该meta分析共纳入了7项研究,106例CAA(>90%为probable CAA),151例对照。淀粉-PET诊断CAA的敏感性从60%到91%,特异性从56%到90%。汇总敏感性为79%,特异性为78%。对于症状性脑叶出血CAA亚组(预定义)(n=58 vs 86例对照)敏感性为79%,特异性为84%。针对两项采用了18F-florbetapir-PET研究,预先设定双变量诊断精确性meta分析发现,其CAA-ICH诊断的敏感性为90%,特异性为88%。

最终作者认为,对于鉴别Probable CAA和认知功能正常的健康者或深部ICH者,淀粉-PET具有中度到良好的诊断精确性。鉴于能够标记脑血管和脑实质淀粉,淀粉-PET阴性可以用于排除CAA。

原始出处:

Charidimou A1, Farid K2, Baron JC.Amyloid-PET in sporadic cerebral amyloid angiopathy: A diagnostic accuracy meta-analysis.Neurology. 2017 Oct 3;89(14):1490-1498. doi: 10.1212/WNL.0000000000004539. Epub 2017 Aug 30.

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    2018-05-26 yinhl1978
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    2018-09-02 feather89
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    2017-11-11 huangdf
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    2017-11-09 Y—xianghai

    学习了新知识

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