扭曲的额外动脉有助于白物质在老化大脑中的超强度
Zhe Sun1,2, Chenyang Li1,2, Arjun V Masurkar3,4
1Department of Radiology, NYU Grossman School of Medicine, New York, NY, United States.
Frontiers in aging neuroscience
|October 27, 2025
概括
额外动脉的动脉扭曲度增加与更大的白质强度 (WMH) 负担有关,特别是在女性中. 这表明动脉形状会影响大脑小血管疾病和认知能力下降的风险.
科学领域:
- 神经学 神经学
- 放射学 放射学是一门学科.
- 血管生物学 血管生物学
背景情况:
- 白质过强度 (WMH) 是大脑小血管疾病的关键指标,通常与老年人的认知障碍有关.
- 大动脉的形态变化,如内动脉 (ICA) 和脊椎动脉 (VA),可能会影响内血流并导致WMH.
- 研究动脉曲和WMH之间的联系对于了解血管对认知衰退的贡献至关重要.
研究的目的:
- 使用磁共振血管学 (MRA) 检查额外动脉扭曲和白质超强度 (WMHs) 之间的关系.
- 评估动脉形态 (扭曲) 和血流是否与WMH严重程度有关.
- 探索与动脉曲和WMH相关的血管脆弱性的潜在性别特异性.
主要方法:
- 75名参与者接受了飞行时间 (TOF) 的MRA和相对照 (PC) 的MRI,以评估动脉形态和血流.
- 动脉曲的量度是使用屈曲计数度量 (ICM) 和内动脉 (ICA) 角度来量化.
- 使用PC-MRI测量全球脑血流 (CBF),并与伪连续动脉旋转标记 (pCASL) 进行比较.
主要成果:
- 与轻度WMH患者相比,患有严重WMH (Fazekas ≥2) 的个体表现出更大的动脉曲 (更高的ICM,更大的ICA角度) 和血流减少.
- 女性表现出更多的曲动脉,更高的WMH负担,以及更容易受到hyperfusion的影响.
- 相关性分析证实了动脉扭曲度和WMH体积之间的积极关联.
结论:
- 外动脉扭曲在白质超强度的负担中起着重要作用.
- 在血管脆弱性方面存在性别特异性差异,女性表现出更大的敏感性.
- 需要进一步的研究来了解与年龄相关的血管改造如何导致WMH发育和认知衰退.
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