韩国300万余人研究支持“胆固醇悖论”:胆固醇水平低,房颤风险反增高

2019-12-15 卢芳 中国循环杂志

血胆固醇水平高,动脉粥样硬化风险高,但是血胆固醇水平低,又如何?韩国一项300余万人的研究显示,血脂水平与房颤的发生负相关,也就是说,血脂水平低了,房颤风险反而高了。此外研究还发现,血脂变异大,房颤风险也增加。图1 房颤风险与血脂水平呈负相关,与血脂变异性(独立于基线水平)呈正相关研究显示,与最低四分位的总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)和甘油三酯

胆固醇水平高,动脉粥样硬化风险高,但是血胆固醇水平低,又如何?

韩国一项300余万人的研究显示,血脂水平与房颤的发生负相关,也就是说,血脂水平低了,房颤风险反而高了。

此外研究还发现,血脂变异大,房颤风险也增加。



图1 房颤风险与血脂水平呈负相关,与血脂变异性(独立于基线水平)呈正相关

研究显示,与最低四分位的总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)和甘油三酯(TG)水平相比,最高四分位对应的分别降低22%、19%、6%和14%的房颤风险。

TC、LDL-C、HDL-C和TG的高变异性分别增加9%、12%、8%和7%的房颤风险。

而且研究者发现,对于男士,甘油三酯水平尤其对男士影响大,甘油三酯水平高房颤风险降低最大,但变异性大房颤风险也最高。

值得一提的是,中国开滦研究也发现类似结果,即总胆固醇水平与房颤风险呈负相关。

为什么胆固醇水平影响房颤?

研究推测,首先胆固醇是细胞膜的组成成分,其水平变化会影响膜通透性和膜蛋白,进而影响跨膜电梯度和静息电位,从而增加心律不齐的发生发展。

而较低的胆固醇水平会增加膜流动性并影响膜功能,引起电位变化。

其次可能炎症介导了胆固醇与房颤的关系。

最后年老和甲亢均与低胆固醇水平有关,者或是隐藏在背后的混杂因素。

研究者还介绍说,他汀有助于改善血胆固醇水平的变异性。

这项研究共纳入韩国国家医疗保险服务数据库中3660385位成人居民的数据,平均年龄为43.9岁,男性占68.1%,均无房颤病史或服用调脂药物。中位随访5.4年期间,新发房颤27581例。

来源:Lee HJ, Lee SR, Choi EK, et al. Low Lipid Levels and High Variability are Associated With the Risk of New-Onset Atrial Fibrillation. J Am Heart Assoc, 2019, 8(23): e012771.

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    2019-12-17 liuxiaona
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    2019-12-17 liuxiaona
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    2019-12-16 心介

    房颤,临床上碰到很多哦

    0