Related Experiment Video

Updated: Aug 30, 2026

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
10:10

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells

Published on: October 27, 2009

Platelet adhesiveness and aggregation in combined factor V and factor VIII deficiency and in combined factor VII and

A Girolami, L de Marco, F Fabris

    Folia Haematologica (Leipzig, Germany : 1928)
    |January 1, 1977
    PubMed

    Insights

    Platelet function remains normal in patients with combined factor VIII deficiencies, including Factor V and Factor VII combined defects. Studies confirm normal serotonin uptake and release, supporting normal bleeding times.

    Area of Science:

    • Hematology
    • Coagulation Disorders
    • Platelet Physiology

    Background:

    • Combined deficiencies of coagulation factors, particularly involving Factor VIII, can impact hemostasis.
    • Understanding platelet function in these complex deficiencies is crucial for diagnosis and management.

    Purpose of the Study:

    • To investigate platelet aggregation, adhesiveness, and serotonin metabolism in patients with combined Factor V/VIII and Factor VII/VIII deficiencies.
    • To determine if combined Factor VIII defects affect overall platelet function.

    Main Methods:

    • Studied platelet aggregation and adhesiveness in patient cohorts.
    • Assessed serotonin C14 uptake and release.
    • Correlated findings with bleeding time and Factor VIII antigen levels.

    Main Results:

    • Platelet aggregation and adhesiveness were normal in all patients studied.
    • Serotonin C14 uptake and release were also normal.
    • All patients exhibited normal bleeding times and Factor VIII antigen levels.

    Conclusions:

    • Combined Factor VIII deficiencies, including those with Factor V or Factor VII, do not impair platelet function.
    • Platelet function appears independent of these specific combined coagulation factor defects.

    More Related Videos

    Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay13:08

    Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

    Published on: September 9, 2012

    Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation08:30

    Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

    Published on: August 14, 2017

    Related Concept Videos

    Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

    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...
    Formation of the Platelet Plug01:22

    Formation of the Platelet Plug

    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...
    Extrinsic and Intrinsic Pathways of Hemostasis01:20

    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 forms a...
    Clot Retraction and Fibrinolysis01:16

    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.
    Disorders of Hemostasis01:24

    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.
    Venous Thrombosis III: Interprofessional Care01:29

    Venous Thrombosis III: Interprofessional Care

    Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...