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相关概念视频

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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生物标志物 生物标志物

Andrew R Bender1, Pavithran Pattiam Giriprakash1, Zhengshi Yang1

  • 1Cleveland Clinic Lou Ruvo Center for Brain Health, Las Vegas, NV, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 26, 2025
PubMed
概括
此摘要是机器生成的。

阿尔茨海默病的病理学,由粉样β (Aβ) 表示,改变大脑白质组织. 纤维分散的新型扩散MRI测量显示,与老年人Aβ水平和认知功能有很强的联系.

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科学领域:

  • 神经成像是一种神经成像.
  • 神经科学是一个神经科学.
  • 放射学 放射学是一门学科.

背景情况:

  • 阿尔茨海默病 (AD) 与大脑微观结构的变化有关,可以通过扩散权重磁共振成像 (dMRI) 检测到.
  • 较小,较晚发育的轴突在早期的AD可能是脆弱的,可能通过dMRI指标,如纤维密度 (FD) 和分散度来测量.
  • 这项研究调查了粉样β (Aβ) 的升高是否预测非痴呆老年人的FD和纤维分散的变化以及它们与认知的关系.

研究的目的:

  • 为了确定粉样β (Aβ) 水平是否与没有痴呆症的老年人白质微观结构的改变相关.
  • 评估dMRI衍生纤维密度 (FD) 和纤维分散对Aβ相关神经病理学的敏感性.
  • 探索这些微观结构变化与认知表现之间的关系.

主要方法:

  • 122名参与者 (认知正常或轻度认知障碍) 接受了多层dMRI和粉样蛋白PET扫描.
  • 使用MRtrix3处理的dMRI数据用于量化声向纤维密度 (FD) 和纤维分散.
  • 质量无变量分析检查了Aβ (半角体水平),预测FD和分散,控制共变量;结果以家族错误率进行校正.

主要成果:

  • 较高的Aβ预测了大脑关键区域 (例如,跨,环膜,海马) 的纤维分散减少,但大脑小区的分散增加.
  • 纤维分散与Aβ百叶状物水平有很强的相关性 (r = -0.78,p < .001).
  • Aβ积极预测特定白质区域的FD;纤维分散,而不是FD,在多个领域显著预测了认知表现.

结论:

  • 粉样β (Aβ) 神经病理与没有痴呆症的成年人白质组织的改变有关.
  • 纤维分散是一种新的dMRI测量,与Aβ水平和认知功能密切相关,独立于年龄和性别.
  • 纤维密度和分散的组合建模为AD相关的微观结构变化和认知影响提供了互补的见解.