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相关概念视频

Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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Secondary Spinal Cord Injury llI: Pathophysiology01:25

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Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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相关实验视频

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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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在患有扩散轴突损伤的患者中异常的动态功能网络连接.

Jian Li1,2, Yao Wang1,2, Yuanyuan Wang1,2

  • 1Department of Radiology, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, People's Republic of China.

Scientific reports
|November 9, 2024
PubMed
概括

扩散轴突损伤 (DAI) 改变动态大脑连接,影响认知功能. 功能网络连接 (FNC) 的这些变化为DAI提供了新的见解.

关键词:
认知障碍 认知障碍是一种认知障碍.扩散性轴突损伤是指扩散性轴突损伤.功能性磁共振成像技术 功能性磁共振成像技术休息状态网络网络的静止状态.时间的变化时间的变化.

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科学领域:

  • 神经科学是一个神经科学.
  • 放射学 放射学是一门学科.
  • 认知科学 认知科学

背景情况:

  • 扩散轴突损伤 (DAI) 是一种与认知障碍相关的严重创伤性脑损伤.
  • 在DAI中潜在的神经认知缺陷的网络机制尚未完全理解.
  • 功能连接性改变与DAI病理生理学有关.

研究的目的:

  • 研究DAI患者的静态和动态功能网络连接 (FNC) 特性.
  • 探索FNC变化与DAI中的认知功能之间的关系.
  • 阐明DAI后认知障碍的神经机制.

主要方法:

  • 休息状态功能磁共振成像 (fMRI) 数据来自26名DAI患者和27名健康对照.
  • 独立组件分析 (ICA) 用于静态网络提取.
  • 移动时间窗口分析和k-means集群用于识别动态FNC状态.

主要成果:

  • DAI患者表现出改变的动态FNC,具有明显的主导状态 (状态1),其特点是增加了分数时间和平均停留时间,与认知得分 (MMSE) 呈正相关.
  • 在所有动态状态中,在DAI患者中观察到功能连接强度的增加,特别是在默认模式和视觉网络中.
  • 静态网络间FNC在很大程度上保持稳定,突出显示了动态分析的重要性.

结论:

  • 动态FNC及其时间属性在DAI中发生了显著的变化,提供了超越静态连接的互补洞察力.
  • 功能性大脑网络中的这些动态变化与DAI的认知障碍有关.
  • 这些发现为DAI的神经病理生理学及其认知后果提供了新的视角.