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Anticoagulant Drugs: Low-Molecular-Weight Heparins

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...

Coagulation

Coagulation

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...

Extrinsic and Intrinsic Pathways of Hemostasis

Extrinsic and Intrinsic Pathways of Hemostasis

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...

Disorders of Hemostasis

Disorders of Hemostasis

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.

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

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.

Introduction to Hemostasis

Introduction to Hemostasis

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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Related Experiment Video

Updated: Jul 2, 2025

Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization

Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization

Published on: June 4, 2020

Clot Waveform Analysis: From Hypercoagulability to Hypocoagulability: A Review.

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

Summary

Clot waveform analysis (CWA) of prothrombin time (PT) and activated partial thromboplastin time (aPTT) reliably detects hypercoagulable and hypocoagulable states. This simple, inexpensive global test provides insights into coagulation system dynamics for routine laboratory use.

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Published on: May 24, 2020

Area of Science:

Hematology
Clinical Chemistry
Diagnostic Medicine

Background:

Prothrombin time (PT) and activated partial thromboplastin time (aPTT) are standard coagulation screening tests.
Existing methods for assessing coagulation dynamics can be expensive and complex for routine use.
There is a need for an economical and easily implementable test for evaluating coagulation states.

Purpose of the Study:

To evaluate clot waveform analysis (CWA) of PT and aPTT.
To assess CWA's ability to reveal the dynamics of clot formation.
To determine if CWA can detect both hypercoagulable and hypocoagulable states.

Main Methods:

A literature review was conducted using MedLine.
Articles related to CWA were retrieved and analyzed.
English-language publications without restrictions on type, year, or geography were considered.

Main Results:

Clot waveform analysis (CWA) demonstrated reliability in identifying both hypercoagulable and hypocoagulable states.
CWA provides information on coagulation system behavior through a simple, global test.
Dedicated software computes first and second derivatives using an on-board algorithm in automated coagulometers.

Conclusions:

Clot waveform analysis (CWA) is a reliable and accessible method for assessing coagulation.
CWA offers a cost-effective alternative for routine laboratory use.
The test provides valuable insights into the dynamics of clot formation.