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相关概念视频

Blood Flow01:29

Blood Flow

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.
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
Coronary Artery Disease I: Introduction01:30

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Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
Coronary Artery Disease II: Pathophysiology01:26

Coronary Artery Disease II: Pathophysiology

Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...
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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
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Published on: April 1, 2015

在高脂血症期间冠状动脉血流储备的减少是血液粘度增加的次要原因.

S J Rim1, H Leong-Poi, J R Lindner

  • 1Cardiovascular Imaging Center, Cardiovascular Division, University of Virginia, Charlottesville, VA, USA.

Circulation
|November 28, 2001
PubMed
概括

在高脂血症中,增加的血液粘度,而不是异常的血管运动,会增加毛细血管抵抗. 这种粘度增加会在最大高血压期间损害冠状动脉血流 (CBF) 储备.

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科学领域:

  • 心血管生理学心血管生理学
  • 血液类风湿学 血液类风湿学
  • 代谢障碍 代谢障碍 代谢障碍

背景情况:

  • 毛细血管抵抗在最大高血压期间显著影响血液流动.
  • 血液粘度是毛细血管阻力的一个关键决定因素.
  • 超脂血症与异常冠状动脉血流 (CBF) 储备相关.

研究的目的:

  • 调查血粘度增加或冠状动脉血管运动异常是否是超脂血症中CBF储量减少的基础.
  • 阐明影响冠状动脉血流在高脂血症期间的风湿学机制.

主要方法:

  • 在使用腺的狗中诱导了最大的高血压.
  • 血清甘油三水平使用Intralipid注入时升高.
  • 测量了血液粘度,心肌血管抵抗力 (MVR) 和高血压心肌血管血流量 (MBF).
  • 在小鼠的肠道显微镜中,克雷马斯特肌肉证实了这些发现.

主要成果:

  • 血清甘油三水平与血液粘度增加有很强的相关性 (r=0.82).
  • 冠状动脉或心肌血管血量没有变化表明血管运动缺乏.
  • 增加的甘油三水平导致了更高的MVR (r=0.84),降低了高血压的MBF (r=-0.64) 和速度 (r=-0.56).

结论:

  • 升高的脂质水平不会改变冠状动脉血管在扩张状态的尺寸.
  • 增加的血液粘度会提高毛细血管的阻力,减轻高血压的CBF.
  • 超脂血症中的异常CBF储备归因于血液粘度增加,而不是血管功能受损.