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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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生物标志物 生物标志物

Emma Pineau1, Keying Chen2, Margaret M Koletar2

  • 1University of Toronto, Toronto, ON, Canada.

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。

功能磁共振成像 (fMRI) 使用血液氧化水平依赖 (BOLD) 测量的大脑激活模式的可变性,随着年龄和认知障碍而增加. 这种变化可能作为阿尔茨海默病 (AD) 认知储备的神经生理学标记.

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科学领域:

  • 神经科学是一个神经科学.
  • 神经成像是一种神经成像.
  • 认知科学 认知科学

背景情况:

  • 阿尔茨海默病 (AD) 病理和认知功能,特别是认知储备之间的关系仍然不太清楚.
  • 对刺激的反应中神经元的变化是一个已知的现象,但尚未在整个大脑范围内进行研究.
  • 我们假设微观的神经元的变化导致宏观的血液氧化水平依赖 (BOLD) 功能磁共振成像 (fMRI) 激活模式的变化,可能反映了认知储备.

研究的目的:

  • 通过使用BOLD fMRI来调查大脑全神经元激活模式的变化.
  • 在老鼠AD模型中探索这种变化和认知储备之间的关系.
  • 为了确定fMRI激活模式的变化是否是认知储备的神经生理学相关的.

主要方法:

  • 在转基因Fischer 344大鼠 (TGF344-AD) 中使用延长的BOLD fMRI协议与重复的体感刺激,建模AD.
  • 通过使用参数激活图和效果大小系列,逐试分析了voxel级响应变异性.
  • 使用皮尔森相关性,量化激活模式的时间和空间变化,并根据年龄和认知状态对动物进行分类.

主要成果:

  • 在年轻的老鼠,认知维持的老鼠和认知受损的老鼠中评估了大脑激活模式的变化.
  • 大脑激活模式的变化量随着年龄和认知障碍程度的增加而增加.
  • 对个体的分析显示了激活模式变异性的显著群体差异.

结论:

  • 开发的BOLD fMRI测定对激活模式可变性的群体间差异敏感.
  • 这种变化与研究的小鼠模型中的认知表现相关.
  • fMRI激活模式的可变性显示出作为认知储备的神经生理学标记物的潜力.