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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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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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Anastomoses01:19

Anastomoses

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In human anatomy, anastomosis refers to a connection or opening between two things, particularly between blood vessels or other tubular structures. The term is derived from the Greek term 'anastomosis,' which means 'outlet' or 'opening.' This natural network of connections plays a critical role in the survival and functionality of the human body.
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Cardiovascular diseases, encompassing a range of conditions, can significantly affect the heart's operations and the overall circulatory system. These conditions impair the heart's ability to pump blood, leading to a deficit in oxygen supply to crucial organs. Anomalies in the heart's electrical system, known as arrhythmias, can cause heartbeats to accelerate or slow down. Usually, heart rates increase during physical activity and decrease while resting or sleeping. However,...
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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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The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
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Updated: Jun 27, 2025

Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye
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Anticoagulation and vascular anomalies.

Shelley E Crary1, Joana M Mack1

  • 1Division of Pediatric Hematology-Oncology, University of Arkansas for Medical Sciences, Arkansas Children's Hospital, Little Rock, Arkansas, USA.

Research and Practice in Thrombosis and Haemostasis
|May 2, 2024
PubMed
Summary

Anticoagulation is rarely used for vascular anomalies, except in slow-flow malformations. These specific cases may benefit from anticoagulation to prevent or treat venous thromboembolism (VTE) and manage thrombosis.

Keywords:
anticoagulantcoagulopathysclerotherapyvascular malformation

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Area of Science:

  • Vascular Medicine
  • Hematology
  • Thrombosis

Background:

  • Vascular anomalies are classified into tumors and malformations.
  • Some anomalies present with coagulation issues but are not typically treated with anticoagulation.
  • Slow-flow vascular malformations are a distinct subgroup with high venous thromboembolism (VTE) risk.

Purpose of the Study:

  • To review the role of anticoagulation in managing vascular anomalies.
  • To highlight the specific subgroup of slow-flow vascular malformations at risk for VTE.
  • To summarize new data on anticoagulation and vascular anomalies from the 2023 ISTH Congress.

Main Methods:

  • Review of current literature and classification systems for vascular anomalies.
  • Analysis of the risk factors for VTE in patients with slow-flow vascular malformations.
  • Synthesis of recent findings presented at the International Society on Thrombosis and Haemostasis (ISTH) Congress.

Main Results:

  • Anticoagulation is generally not indicated for most vascular tumors and malformations.
  • Slow-flow vascular malformations carry a significant risk of VTE and associated coagulopathy.
  • Anticoagulation may be beneficial for VTE prevention, treatment, or managing localized thrombosis in these specific malformations.

Conclusions:

  • Anticoagulation is a specialized treatment for select patients with slow-flow vascular malformations.
  • Careful assessment of VTE risk factors is crucial in these patients.
  • Further research and data from congresses like ISTH inform management strategies.