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関連する概念動画

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

Coronary Artery Disease I: Introduction

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...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

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Updated: May 11, 2026

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

ハイパーリピデミア中の冠動脈血流準備量の減少は,血液粘度の増加に二次的である.

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
まとめ
この要約は機械生成です。

超脂血症では,異常な血管運動ではなく,血の粘度の増加が毛細血管抵抗を高める. この粘度の増加は,最大高血圧期における冠動脈血流 (CBF) の準備を損なう.

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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

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Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography
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Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography

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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
07:09

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Published on: April 1, 2015

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
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Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography
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科学分野:

  • 心血管生理学 心血管の生理学
  • 血液リウオロギー 血液リウオロギー
  • メタボリック障害 メタボリック障害

背景:

  • 毛細血管抵抗は,最大高血圧期における血流に大きな影響を及ぼします.
  • 血液の粘性は,毛細血管の抵抗を決定する重要な要因です.
  • 超脂血症は,異常な冠動脈血流 (CBF) の予備量と関連しています.

研究 の 目的:

  • 血の粘度増加や冠動脈の異常動脈が,高脂血症におけるCBFの貯蔵量の減少の原因であるかどうかを調べる.
  • ハイパーリピデミア中の冠動脈の血流に影響を与えるレオロギー的メカニズムを解明する.

主な方法:

  • アデノシンを使用した犬の最大血圧上昇が誘発されました.
  • 血清トリグリセリドレベルは,イントラリピド注入を使用すると上昇しました.
  • 血液粘度,心筋血管抵抗 (MVR),および高血圧心筋血流 (MBF) を測定した.
  • マウスにおける腸内顕微鏡検査では,クレマスター筋の発見が確認された.

主要な成果:

  • 血清トリグリセリドレベルは,血中の粘度増加と強く相関していた (r=0.82).
  • 冠動脈や心筋の血量に変化がないことは,血管運動の欠如を示唆した.
  • トリグリセリド濃度の上昇は,より高いMVR (r=0.84) と低血圧MBF (r=-0.64) と速度 (r=-0.56) を引き起こした.

結論:

  • 脂質濃度の上昇は,拡張状態の冠動脈血管の寸法を変えることはありません.
  • 血粘性の上昇は毛細血管の抵抗を高め,高血圧のCBFを弱める.
  • 超脂血症における異常なCBF備蓄は,血管機能の障害ではなく,血粘性の増加に起因する.