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Related Concept Videos

Introduction to Hemostasis01:05

Introduction to Hemostasis

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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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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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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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Inflammatory Response II: Inflammatory Exudate and Tissue Repair01:24

Inflammatory Response II: Inflammatory Exudate and Tissue Repair

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The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
The typical wound exudate is odorless, transparent, straw-colored, thin, and watery. Exudate, however, can differ depending on the state of wound healing. Likewise, the...
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Phases of Wound Repair01:28

Phases of Wound Repair

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Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
Formation of Blood Clot
In case of deep injuries, trauma to blood vessels results in blood loss. In the meantime, phospholipids released from the ruptured endothelial cellular membrane are converted into arachidonic...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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TAPE: A Biodegradable Hemostatic Glue Inspired by a Ubiquitous Compound in Plants for Surgical Application
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Haemostatic materials for wound healing applications.

Baolin Guo1,2, Ruonan Dong3, Yongping Liang3

  • 1State Key Laboratory for Mechanical Behavior of Materials, and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China. baoling@mail.xjtu.edu.cn.

Nature Reviews. Chemistry
|April 28, 2023
PubMed
Summary

This review covers advances in haemostatic materials for wound healing. It details the chemical design and operation of these materials, aiding faster wound closure.

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Area of Science:

  • Biomaterials Science
  • Wound Healing Research
  • Polymer Chemistry

Background:

  • Wound care costs are rising, making efficient healing crucial.
  • Haemostasis, the initial step in wound healing, is a key target for therapeutic intervention.
  • Recent years have seen rapid development in haemostatic materials.

Purpose of the Study:

  • To provide an overview of haemostatic materials used in wound healing.
  • To focus on the chemical design and operational principles of these materials.
  • To elucidate the physiological process of haemostasis and its relevance to dressing design.

Main Methods:

  • Review of existing literature on haemostatic materials.
  • Analysis of different active components (natural/synthetic polymers, silicon-based, metal-containing).
  • Examination of various material forms (sponges, hydrogels, nanofibres, particles).

Main Results:

  • Haemostatic materials are diverse in composition and form.
  • Understanding haemostasis principles guides the design of effective wound dressings.
  • Different materials offer unique advantages and limitations.

Conclusions:

  • The chemical design and operational mechanisms of haemostatic materials are critical for wound healing.
  • Further research is needed to address current challenges and explore future directions in haemostatic material development.