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相关概念视频

Laminar and Turbulent Flow01:07

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Blood Flow01:29

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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Pulmonary Hypertension: Classification and Pathogenesis01:30

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Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
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Steady, Laminar Flow in Circular Tubes01:23

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
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When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
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Increasing Pulmonary Artery Pulsatile Flow Improves Hypoxic Pulmonary Hypertension in Piglets
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脉动性流动力学决定了肺动脉的结构.

Stephen Spurgin1,2, Lauren Thai2, Tina Wan3,4

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA 75390.

bioRxiv : the preprint server for biology
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概括

在单心室心脏病中Glenn手术后动脉脉动力的损失改变了肺动脉结构. 这项研究揭示了脉动拉伸是通过内皮-平滑肌肉细胞通信维持血管健康的关键.

关键词:
格伦格伦格伦格伦格伦格伦格伦格伦格伦格伦这是PDGFBB.生物机械力是一种生物力.遗传性心脏病是一种先天性心脏病.细胞内皮细胞的内皮细胞.血液动力学 血液动力学这里是鼠标鼠标鼠标鼠标鼠标鼠标.壁画细胞的壁画.脉动性是一种脉动性.鼠标 鼠标 鼠标 鼠标 鼠标一个单心室单心室.

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科学领域:

  • 心血管研究研究心血管研究
  • 儿童心脏病学 儿童心脏病学
  • 血管生物学 血管生物学

背景情况:

  • 单心室先天性心脏病 (单心室先天性心脏病) (SV-CHD) 是一种无需手术缓解的致命疾病.
  • 格伦手术创建了缺乏心脏驱动的脉动性循环,导致肺血管并发症.
  • 在SV-CHD患者的肺动脉中,脉动性损失对细胞的影响仍未得到研究.

研究的目的:

  • 定义和量化Glen手术的SV-CHD患者的肺动脉脉动力损失.
  • 为了研究内皮细胞 (ECs) 对改变的血液动力学力量的细胞和分子反应.
  • 阐明动脉脉动性在维持肺血管架构中的作用.

主要方法:

  • 结合心脏导管和MRI用于评估格伦患者的脉动性.
  • 培养的人类肺动脉EC被暴露在血动力学力 (流量,压力,拉伸) 的个体维度中.
  • 采用了大量RNA测序,GSEA,ELISA,免疫光和老鼠格伦循环模型.

主要成果:

  • 在格伦患者的流量,压力和伸展中量化了脉冲性损失.
  • 在暴露于不同脉动性维度的EC中观察到不同的转录特征.
  • 脉动性拉伸被确定为PDGFB分泌的关键,促进血管光滑肌肉细胞 (vSMC) 招募和增殖,而脉动性损失导致血管壁变薄并减少VSMCs.

结论:

  • 血流脉动性对于维持肺血管架构至关重要.
  • 通过脉动拉伸和PDGFB介导的EC-SMC交叉声的新型机制被确定.
  • 动脉脉动力被EC感知并传递给VSMC,从而保持血液动力学支所必需的血管结构.