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相关概念视频

Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
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Disorders of Hemostasis01:24

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
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Clot Retraction and Fibrinolysis01:16

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
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相关实验视频

Updated: Jul 2, 2025

Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization
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凝块波形分析:从高凝结度到低凝结度:一篇综述

Francesco Marongiu1, Maria Filomena Ruberto1, Silvia Marongiu2

  • 1From the Department of Medical Sciences and Public Health (F Marongiu, Ruberto, Barcellona) and Thrombosis and Haemostasis Unit (Barcellona), University of Cagliari, Cagliari, Italy.

Archives of pathology & laboratory medicine
|February 20, 2024
PubMed
概括

血块波形分析 (CWA) 的前血时间 (PT) 和激活的部分血栓形成时间 (aPTT) 可靠地检测高凝血和低凝血状态. 这种简单,廉价的全球测试为常规实验室使用提供了对凝血系统动态的见解.

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相关实验视频

Last Updated: Jul 2, 2025

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科学领域:

  • 血液学 血液学 血液学
  • 临床化学 临床化学
  • 诊断医学 诊断医学 诊断医学

背景情况:

  • 质血组时间 (PT) 和激活的部分血栓形成时间 (aPTT) 是标准的凝血查测试.
  • 评估凝血动态的现有方法可能是昂贵和复杂的常规使用.
  • 需要一种经济且易于实施的测试来评估凝血状态.

研究的目的:

  • 为了评估PT和aPTT的凝块波形分析 (CWA).
  • 评估CWA揭示凝块形成的动态的能力.
  • 为了确定CWA是否能够检测出高凝血和低凝血状态.

主要方法:

  • 使用MedLine进行了一项文献综述.
  • 获取和分析了与CWA相关的文章.
  • 考虑了没有类型,年份或地理位置限制的英语出版物.

主要成果:

  • 凝块波形分析 (CWA) 在确定高凝固和低凝固状态方面表现出可靠性.
  • CWA通过一个简单的全球测试提供了有关凝血系统行为的信息.
  • 专门的软件使用自动凝血仪的内置算法计算第一和第二导数.

结论:

  • 凝块波形分析 (CWA) 是评估凝血的一种可靠且易于使用的方法.
  • CWA为常规实验室使用提供了具有成本效益的替代方案.
  • 该测试为凝块形成的动态提供了宝贵的见解.