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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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Disorders of Hemostasis01:24

Disorders of Hemostasis

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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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Vascular Spasm01:16

Vascular Spasm

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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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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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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Application of Hemostatic Devices in Laparoscopic Hepatectomy
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Hemostasis in Pediatric Surgery.

Soham Roy1, Jo-Lawrence Bigcas1, Laura Vandelaar1

  • 1Department of Otolaryngology, University of Texas at Houston McGovern Medical School, 6431 Fannin Street, MSB 5.036, Houston, TX 77030, USA.

Otolaryngologic Clinics of North America
|June 9, 2016
PubMed
Summary
This summary is machine-generated.

This review covers hemostasis in pediatric otolaryngologic surgery, detailing preoperative evaluation, surgical techniques, and blood transfusion guidelines for managing hemorrhage in children.

Keywords:
EpistaxisHemostasisPediatricTonsillectomyVon Willebrand

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Area of Science:

  • Pediatric Otolaryngology
  • Surgical Hemostasis

Background:

  • Hemostasis is a critical aspect of pediatric otolaryngologic surgery.
  • Effective management of bleeding is essential for patient safety and surgical outcomes.

Purpose of the Study:

  • To provide a comprehensive overview of hemostatic considerations in pediatric otolaryngology.
  • To guide otolaryngologists in clinical evaluation and surgical technique for hemostasis.

Main Methods:

  • Review of preoperative evaluation strategies for bleeding risk.
  • Discussion of mechanical and chemical hemostatic methods.
  • Analysis of hemostatic techniques in common pediatric procedures.
  • Examination of transfusion guidelines for intraoperative and postoperative hemorrhage.

Main Results:

  • Detailed preoperative assessment is crucial for identifying potential bleeding risks.
  • A range of mechanical and chemical hemostatic agents and techniques are available.
  • Specific hemostatic strategies should be tailored to individual pediatric procedures.
  • Clear indications exist for blood transfusions in cases of significant hemorrhage.

Conclusions:

  • Optimizing hemostasis in pediatric otolaryngology requires a multi-faceted approach.
  • Careful preoperative evaluation, appropriate technique selection, and judicious use of hemostatic agents are vital.
  • Understanding transfusion guidelines ensures timely management of severe bleeding events.