Age and Ageing:基于大脑白质高信号的脑龄模型反应神经老年人神经血管健康状况

2022-08-01 影像小生 MedSci原创

该模型易于在临床实践中使用,有助于客观地评估WMH的严重程度。目前的研究结果支持这一基于WMH的年龄测量指标来反映神经血管健康,并对年龄相关神经血管疾病的临床或研究具有潜在的诊断和预后价值。

白质高信号被认为是起源于白质损伤,发生损伤的原因主要为神经血管功能退化包括髓鞘或轴突丢失、组织稀疏、神经胶质增生、短暂脑梗或大脑血流长期低灌注。白质损伤不仅影响灰质间神经纤维的沟通效率,更被证实为认知障碍、抑郁甚至痴呆症的关键风险因子。

近期黄楚中等在Age and Ageing发表研究成果,利用来自一个健康数据集的WMH数据建立一个基于WMH的年龄预测模型,并在另一个中老年非中风非痴呆的数据集中验证模型的年龄预测能力。通过分析神经血管生物学年龄与认知功能和心血管危险因素的关系来测试该指标的有效性。

在这项前瞻性单点研究中,以491名健康参与者(21-89岁)的WMH体积为基础构建了基于WMH的年龄预测模型。

训练和测试数据集上线性回归预测模型的性能

1.   建立的年龄估计器对测试数据集具有一定的泛化能力(RMSE = 7.76,MAE = 6.38岁)。

2.   在测试数据集中,WMH预测的年龄差异与视觉执行功能呈负相关。

预测年龄与心血管负担之间的关系。

3.   预测年龄大于实际年龄的个体比正常或延迟预测年龄的个体有更大的心血管负担和心血管疾病风险。这些联系与实际年龄无关。

综上所述,该研究建立了一种独立于个体实足年龄的脑白质损伤量评估方法,该模型基于一个简单的线性回归方法,相对容易获得和解释,利用该模型预测的脑神经血管年龄可以反映一个人的白质损伤量是否超过了同年龄的健康群体平均值,进而评估个体当下心血管健康状态。这种测量模型具有在临床和研究中用于病人分群的应用潜力,并可作为诊断年龄相关神经血管疾病的新指标。

 

 原文出处

Huang, C. C., Chou, K. H., Lee, W. J., Yang, A. C., Tsai, S. J., Chen, L. K., ... & Lin, C. P. (2022). Brain white matter hyperintensities-predicted age reflects neurovascular health in middle-to-old aged subjects. Age and Ageing, 51(5), afac106. https://academic.oup.com/ageing/article-abstract/51/5/afac106/6583203?redirectedFrom=fulltext#

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    2022-08-02 ms5000001410456216

    脑功能的退化,实际上就是衰老病变

    0

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