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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

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

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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.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
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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

Talia M Nir1, Sunanda Somu1, Kevin Low1

  • 1Imaging Genetics Center, Mark and Mary Stevens Neuroimaging & Informatics Institute, University of Southern California, Marina del Rey, CA, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
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概括
此摘要是机器生成的。

先进的扩散MRI测量显示大脑中的粉样β (Aβ) 与皮质厚度的联系比皮质厚度更强,可能揭示早期阿尔茨海默病的变化. 这些发现表明dMRI提供了对临床前神经病理学更深入的见解.

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科学领域:

  • 神经成像是一种神经成像.
  • 阿尔茨海默氏症疾病研究研究
  • 大脑微观结构分析

背景情况:

  • 扩散MRI (dMRI) 检测到微妙的大脑微观结构的变化,可能在宏观结构变化之前识别早期阿尔茨海默病 (AD) 病理.
  • 皮质灰质 (GM) 在AD早期受到影响;dMRI可能比皮质厚度 (CTh) 更好地捕捉粉样β (Aβ) 效应.

研究的目的:

  • 评估Aβ-PET和单皮质dMRI测量在认知正常 (CN) 个体之间的关系.
  • 为了比较dMRI发现与与Aβ负载相关的传统CTh测量.

主要方法:

  • 在四项AD研究中分析了769名CN参与者的T1w,dMRI和Aβ-PET数据.
  • 应用先进的dMRI模型 (NODDI-DTI,MAP-AMURA) 与DTI一起使用.
  • 提取区域皮质MRI测量和测试协会与Aβ-PET百叶状物,调整为共变量和tau-PET状态.

主要成果:

  • 与三个dMRI测量和CTh相关的Aβ-PET百叶状物.
  • 先进的dMRI模型揭示了Aβ和更高的APA (阻碍扩散) 和更低的ODI (神经元分散) 之间的更广泛的关联.
  • 较低的ODI被tau阳性调节,表明tau阳性个体的效果更大.

结论:

  • 先进的dMRI测量显示,与CTh相比,Aβ负载的相关性更广泛.
  • 与Aβ相关的阻碍扩散 (APA,FA) 的增加可能表明早期的细胞变化或炎症.
  • 与Aβ相关的减少神经元分散 (ODI) 表明神经退行,特别是在tau阳性个体中,突出显示dMRI对早期AD过程洞察力的潜力.