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AAIC 2013:FDG-PET可能用于临床前阿尔茨海默病检测

2013-07-17 MedSci Medscape Today

来自2013阿尔茨海默病协会国际会议(AAIC 2013)的一项最新研究表明记忆功能测试联合脑部影像学检查可能有助于明确阿尔茨海默病(AD)最早期阶段,以便能够在症状出现之前,采取措施减缓疾病的进程。该研究发现,伴有情景记忆功能障碍和淀粉样蛋白升高的认知功能正常的成人具有进展为AD痴呆的高风险。该研究由波士顿哈佛医学院副教授Dorene M. Rentz博士报告。 研究概述 Rentz博士解释

来自2013阿尔茨海默病协会国际会议(AAIC 2013)的一项最新研究表明记忆功能测试联合脑部影像学检查可能有助于明确阿尔茨海默病(AD)最早期阶段,以便能够在症状出现之前,采取措施减缓疾病的进程。该研究发现,伴有情景记忆功能障碍和淀粉样蛋白升高的认知功能正常的成人具有进展为AD痴呆的高风险。该研究由波士顿哈佛医学院副教授Dorene M. Rentz博士报告。

研究概述

Rentz博士解释说,最近一些轻中度AD药物治疗研究表明,AD的治疗时机应该是在临床前期,或症状前期,当认知表现尚属正常,但影像学证实有淀粉样变性及神经元损伤证据时。

Rentz博士及其同事们设计了一项研究,旨在研究认知功能正常的老年人记忆和执行功能测试是否与突触的完整性(氟18脱氧葡萄糖正电子发射断层扫描FDG-PET检测)和淀粉样蛋白沉积(C11匹兹堡化合物B PIB PET检测)相关。Rentz博士说,“我们试图确定那些记忆和思维能力测试得分较低的个体是否也存在广泛的淀粉样斑块,以及是否与AD脑区神经损伤相关。”

研究入选了129例年龄在65至87岁之间的正常老年人(平均年龄为73.7岁),临床痴呆评定量表得分为0分。

研究人员发现,淀粉样蛋白负荷和突触功能障碍可独立地预测情景记忆功能。记忆功能较差的个体在AD受影响的脑区有较高的的PIB淀粉样蛋白沉积和低葡萄糖代谢。

Rentz博士说,“然而,并非所有的记忆功能变化都是由于淀粉样蛋白斑块沉积所致。有一些记忆功能测试分数更差,FDG代谢更低的个体PIB扫描为正常。这些记忆功能的变化可能是由于其他非AD性(例如血管性)变化所致,或者这些变化发生在淀粉样斑块沉积之前,可能扮演着催化剂的作用,最终导致淀粉样斑块形成。”

非记忆的执行功能测试差的个体,也有更低的的FDG代谢(突触功能障碍),但PIB扫描正常(无淀粉样蛋白沉积)。受过更多教育的个体可能认知功能正常,尽管FDG代谢可能更低,PiB沉积更多。Rentz博士说,“这可能意味着教育程度在临床前期AD中的早期阶段对认知功能具有保护作用。”

她解释说,受过更高等教育的个体可以维持其认知功能正常的时间更长,尽管脑内可能已经出现了AD样改变的证据。这意味着记忆功能测试可能不是明确临床前AD患者的最好方式,然而,克服这个问题的更灵敏的测试正在开发中。

Rentz博士说,“总之,我们的研究表明记忆功能更差,FDG代谢更低,PiB沉积更多的人更可能进展为AD。”

研究评论

阿尔茨海默病协会主席Heather Snyder博士评论说,“该项研究很重要是因为它告诉我们如何从正常人群中区分出风险较高的人,以便我们在能够对疾病进行干预时对其进行治疗延缓或阻止疾病的进程。”

阿尔茨海默病协会副主席Maria Carrillo评论说,还需要更多的研究。她说联合影像学和认知功能测试来确认普通人群中AD最早期阶段“并未到最恰当的时机”。

原始出处:

Ewers M, Insel PS, Stern Y, Weiner MW; Alzheimer's Disease Neuroimaging Initiative (ADNI).  Cognitive reserve associated with FDG-PET in preclinical Alzheimer disease.
Neurology. 2013 Mar 26;80(13):1194-201.
下载: Neurology-2013-Ewers-1194-201.pdf

Jicha GA, Rentz DM. Cognitive and brain reserve and the diagnosis and treatment of preclinical Alzheimer disease. Neurology. 2013 Mar 26;80(13):1180-1.

下载:1180.full.pdf

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    2014-01-29 hywen7337
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    2014-03-14 feather89
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