生物标志物 生物标志物
Tyler Ann Busch1, Kevin Iversen1, Skylar Stolte1
1University of Florida, Gainesville, FL, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 26, 2025
概括
在老年人中,准确的头部解剖学建模对于有效的跨直流刺激 (tDCS) 至关重要. 个体解剖学差异,特别是脂肪和皮质骨,显著改变老化大脑的电流.
科学领域:
- 神经科学是一个神经科学.
- 生物医学工程 生物医学工程
- 老年学是指老年学的学科.
背景情况:
- 跨直流刺激 (tDCS) 显示出缓解与年龄相关的认知衰退的前景.
- 个体tDCS反应受到解剖学变异的影响,正如有限元素方法 (FEM) 建模所示.
- 目前的头部细分工具没有针对老年人解剖学进行优化,导致tDCS当前分布预测不准确.
研究的目的:
- 创建由认知健康的老年人手动细分T1加权图像的最大数据集.
- 调查校正老年人解剖学对tDCS电流分布的影响.
- 在老化的大脑中识别tDCS电流密度的关键解剖预测因素.
主要方法:
- 将头部划分为11种组织类型.
- 修改ROAST工具以容纳11个用于tDCS建模的组织 (2mA,F4阳极,F3阴极).
- 使用多个线性回归,计算上额 (SFG),下额 (IFG) 和中额 (MFG) 的中位电流密度 (J).
主要成果:
- 回归模型解释了ROI之间当前密度 (43.2-49.4%) 的显著差异.
- 脂肪和皮层骨体积是当前密度的显著负预测因素.
- 较高的大脑到内体积与电流密度正相关.
结论:
- 解剖学变异性,特别是脂肪和皮质骨,显著影响老年人中tDCS当前分布.
- 脂肪的绝缘特性和皮层骨的电阻特性降低了电流密度.
- 大脑缩,由较低的大脑到内体积表明,导致CSF内部的电流分流,减少大脑中的电流密度.
相关概念视频
01:20Blood Studies for Cardiovascular System I: Cardiac Biomarkers
749
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...
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...
749
01:19Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers
516
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...
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
516