摘要
背景:中央动脉僵硬是与年龄相关的认知障碍和阿尔茨海默氏病(AD)的新兴危险因素。然而,潜在的病理生理机制仍不清楚。 目的:我们检验了以下假设:在AD的前驱阶段轻度认知障碍(MCI)患者中,颈动脉僵硬度与脑血流量(CBF)降低和脑血管阻力(CVR)升高有关。 方法:对54例失忆性MCI患者和24名年龄和性别与MCI患者相似的认知正常受试者(CN)进行超声和压平眼压计测量CBF和颈动脉β-刚度指数。将总CBF量作为来自颈内动脉和椎动脉的CBF的总和,除以总脑组织质量(通过MRI评估)即可获得标准化CBF(nCBF)。 结果:相对于CN受试者,MCI患者的nCBF较低(53.3±3.2 vs 50.4±3.4 mL / 100 g / min,P <0.001)和CVR较高(0.143±0.019 vs 0.156±0.023 mmHg / mL / min,P < 0.015)。多元线性回归分析表明,nCBF与颈动脉β-刚度指数呈负相关(B = -0.822,P <0.001)。在调整年龄,性别,体重指数和MCI状态后,CVR与颈动脉收缩压呈正相关(B = 0.001,P <0.001)。 结论:这些发现表明,MCI伴颈动脉搏动增加的患者,颈动脉僵硬可能至少部分地导致nCBF降低和CVR升高。
关键词: 轻度遗忘性认知障碍,颈动脉僵硬,脑灌注不足,脑血管阻力, 搏动性脑血流,经颅多普勒,超声检查。
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