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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.
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

Jiaqi Wen1,2, Chenyang Li3, Zhe Sun3

  • 1New York University Grossman School of Medicine, New York, NY, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
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概括

衰老会影响海马,动脉传输时间 (ATT) 比脑血流 (CBF) 更脆弱. 性差异出现,女性大脑对海马和相关区域与年龄相关的变化更容易受到影响.

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科学领域:

  • 神经科学是一个神经科学.
  • 衰老研究研究 衰老研究
  • 神经成像是一种神经成像.

背景情况:

  • 对于认知至关重要的海马体经历了与年龄相关的结构和血管变化.
  • 了解海马结构,血管功能和连接的大脑区域之间的相互作用至关重要,特别是考虑到性别特定的衰老模式.
  • 老年妇女的荷尔蒙变化可能会增加对衰老效应的脆弱性.

研究的目的:

  • 在健康的衰老过程中,研究海马子体和连接的前额外和内腔皮层中的结构和血管变化之间的关系.
  • 探索这些与年龄相关的变化如何影响认知功能.
  • 在这些神经生物学变化中识别性别特异性模式.

主要方法:

  • 利用了T1-MPRAGE和伪连续动脉旋转标记 (pCASL) 数据,这些数据来自HCP-Aging数据集中的650名受试者.
  • 使用FreeSurfer和Hippfold分割了前额叶皮层,脑内皮层和海马体的子领域 (subiculum,CA1-4,牙状圈).
  • 处理了pCASL数据以获得海马子场中的脑血流 (CBF) 和动脉传输时间 (ATT);使用复合分数评估认知功能.

主要成果:

  • 所有海马子场都显示了与年龄相关的缩;ATT对衰老更敏感,与缩的相关性比CBF更强.
  • 在CA1子场表现出最低的 perfusion 和缩最强的关联. 女性海马子场比男性更容易受到衰老和缩的影响.
  • 在男性中, subiculum CBF 可能会补偿缩. 前额叶皮层显示的输液下降比内皮层更大. 在女性中,CA1缩通过在前额叶皮层的延迟ATT影响认知.

结论:

  • 建立了海马体和相关皮质区域的结构和血管功能之间的关系,突出了与年龄相关的,性别特定的和子领域特定的变化.
  • 研究结果提供了对与年龄相关的神经退行性疾病 (如阿尔茨海默氏症) 背后的机制的见解.
  • 这项研究强调了在老化大脑研究中考虑子领域和性别差异的重要性.