Alzheimer''s & Dement:高胆固醇对老年人认知影响受年龄限制

2018-03-25 佚名 嘉音

3月5日,在线发表于《Alzheimer’s & Dementia》杂志上的一项研究表明,随着年龄的增长,老年人高胆固醇水平与认知能力下降之间的线性关系会减弱,到了85岁之后,这一关系甚至会逆转。

3月5日,在线发表于《Alzheimer’s & Dementia》杂志上的一项研究表明,随着年龄的增长,老年人高胆固醇水平与认知能力下降之间的线性关系会减弱,到了85岁之后,这一关系甚至会逆转。

胆固醇水平,尤其是人到中年(40岁)的时候,常常会与较差的认知结局相关,如认知能力下降、痴呆和阿尔兹海默症(AD)。然而,目前有关70多岁老年人的一些纵向研究显示的结果却不一致,其中,就包括高胆固醇水平与更低的AD风险相关。因此,本研究的目的在于明确不同年龄人群的胆固醇水平与认知能力下降之间的关系。

本研究所纳入的1897名受试者全部来自于弗明汉心脏病研究(Framingham Heart Study)。这些患者入组时都有正常的认知能力,平均年龄为40.2岁,女性人数占61%。明显的认知能力下降被定义为痴呆或者简易精神状态检查(MMSE)评分≤20,正常的认知能力被定义为MMSE≥25。正常的总胆固醇水平为≤200mg/dl。

研究结果显示,在整个随访期间,6%的人被诊断为痴呆,10.6%的人被诊断为明显的认知能力下降。随着时间的推移,那些入选年龄低、教育程度低、不使用他汀类药物和总胆固醇含量偏高的人群,整体上都有认知能力的下降。然而,随着年龄的增加,认知评估显示这一线性关系正变得越来越弱。

此外,研究者对75~84岁和85~94岁这两个特殊的年龄组进行观察,发现,前者并没有任何因素与明显的认知能力下降相关;后者,从中年(平均40岁)开始的总胆固醇升高以及在中年时总胆固醇检测含量偏高与更低的认知能力下降风险相关。

本研究作者,来自纽约伊坎医学院Jeremy Silverman博士及同事认为:“如果你在85岁以上仍然有良好的认知水平,可能是你从中年开始高胆固醇水平所带来的一个结果。”

“这些好的结果可能要归因于所谓的‘幸存者效应’,即那些寿命非常长的人,虽然携带所谓的风险基因和风险因素,但他们身体中可能存在我们还未发现的保护性因子。”

Silverman博士说道:“这项研究将有助于接下来更精细的研究,即哪些因素,遗传因素或者其它,与认知老化相关。举个例子,以后的研究可对“受保护的幸存者”与同时存在痴呆症和高胆固醇水平的人进行比较,以探讨两者之间的差异。

最后,研究者也警告,不要在临床中过度解读这一研究结果。“我们当然不建议人们在85岁时积极升高胆固醇,我们并不认为高胆固醇水平会有保护作用,如果你不属于那种受保护的群体,升高胆固醇的结果可能会很糟糕。但本研究也从另一方面表明,在某些年龄段,你不必担心你目前的胆固醇水平。至少在认知问题上,高龄的老年人胆固醇水平高似乎并不是需要担心的问题。”

原始出处:
Silverman JM, Schmeidler J. Outcome age-based prediction of successful cognitive aging by total cholesterol. Alzheimer's & Dement. Mar 5, 2018.

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    2018-03-26 ms5000001349886152

    认知功能-我也想看看

    0

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    2018-03-26 yfjms

    学习

    0

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    2018-03-25 紫迎馨

    学习了

    0

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    2018-03-25 有备才能无患

    3月5日.在线发表于杂志上的一项研究表明.随着年龄的增长.老年人高胆固醇水平与认知能力下降之间的线性关系会减弱.到了85岁之后.这一关系甚至会逆转.

    0

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    2018-03-25 1ddf0692m34(暂无匿称)

    学习了.长知识

    0

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    2018-03-25 虈亣靌

    谢谢分享学习了

    0

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    2018-03-25 戒馋,懒,贪

    谢谢分享学习了

    0

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