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Alzheimer's Disease: Overview01:26

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阿尔茨海默氏症成像联盟

Azadeh Feizpour1,2, Pierrick Bourgeat3, Vincent Dore2,4

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概括
此摘要是机器生成的。

血中粉样蛋白β 42/40 水平异常但粉样蛋白β 阳位素发射断层扫描 (Aβ-PET) 扫描呈阴性的人面临着未来 Aβ-PET 阳性的显著更高风险. 这表明血测试可以在PET扫描上可见之前检测大脑粉样蛋白病理.

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科学领域:

  • 神经学 神经学
  • 生物标志物发现发现
  • 阿尔茨海默氏症疾病研究研究

背景情况:

  • 血Aβ42/40水平与Aβ-PET扫描之间的一致性约为75%.
  • 差异往往来自于阴性PET扫描带有阳性等离子体结果.
  • 目前尚不清楚这些差异是否表明PET之前可通过血检测到的早期大脑Aβ变化.

研究的目的:

  • 在11年内调查血Aβ42/40和Aβ-PET结果不一致的个体.
  • 评估从负向阳性Aβ-PET状态的进展的风险和时间.
  • 确定血Aβ42/40是否可以预测未来的Aβ-PET阳性.

主要方法:

  • 从AIBL,OASIS和ADNI研究中对认知不受损的参与者的分析.
  • 使用IPMS进行基线Aβ-PET和血Aβ42/40分析,并在1.5-3年后进行随访PET扫描.
  • 卡普兰-梅尔和考克斯的比例危险分析,以评估进展到Aβ-PET阳性的风险 (>20 Centiloid).

主要成果:

  • 血阳性和阴性PET (<5百度) 个体与血阴性/PET-个体相比,进展到PET+的风险高3.90倍.
  • 血+/PET-个体的脑Aβ积累速度大约是Plasma-/PET-个体的8倍 (1.14对0.15百分/年).
  • 在Plasma+/PET-组中,平均而言,PET+的进展发生在2年前.

结论:

  • 具有异常血Aβ42/40但阴性Aβ-PET的认知正常的个体具有显著增加未来Aβ-PET阳性的风险.
  • 这些发现支持了血Aβ42/40可以在PET检测到之前检测到大脑Aβ病理的假设.
  • 需要进一步的研究来确认这是否适用于其他等离子体Aβ42/40免疫试验.