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The ristocetin-induced platelet aggregation (RIPA) is an ex vivo assay for live platelet function. It measures platelet aggregation with the help of von Willebrand factor (vWF) and exogenous antibiotic ristocetin added in a graded fashion. [1] It is similar to the ristocetin cofactor assay but has the added benefit in that it helps in the ...
The PFA-100 (Platelet Function Assay — 100) is a system for analysing platelet function in which citrated whole blood is aspirated through a disposable cartridge containing an aperture within a membrane coated with either collagen and epinephrine or collagen and ADP. These agonists induce platelet adhesion, activation and aggregation, leading ...
Multiple electrode aggregometry. Multiplate multiple electrode aggregometry (MEA) is a test of platelet function in whole blood. [1][2] The test can be used to diagnose platelet disorders, [3][4][5] monitor antiplatelet therapy, [6] and is also investigated as a potential predictor of transfusion requirements and bleeding risk in cardiac surgery.
Glanzmann's thrombasthenia is associated with abnormal integrin α IIb β 3, formerly known as glycoprotein IIb/IIIa (GpIIb/IIIa), [7] which is an integrin aggregation receptor on platelets. This receptor is activated when the platelet is stimulated by ADP, epinephrine, collagen, or thrombin. GpIIb/IIIa is essential to blood coagulation since ...
Platelet plug formation: The adhered platelets aggregate and form a temporary plug to stop bleeding. This process is often called "primary hemostasis". [19] Coagulation cascade: It is a series of enzymatic reactions that lead to the formation of a stable blood clot. The endothelial cells release substances like tissue factor, which triggers the ...
One primary function of thromboregulation is the control of primary hemostasis, which is the platelet aggregation process. Some thromboregulators enhance platelet aggregation and some others inhibit the process. Platelet aggregation plays a critical role in the genesis of a resulting thrombus. Adhesion should remain local, but platelet ...
Platelet storage pool deficiency is a family of clotting disorders characterized by deficient granules in platelets. Individuals with these disorders have too few or abnormally functioning alpha granules , delta granules , or both alpha and delta granules and are therefore unable to form effective clots, which leads to prolonged bleeding.
Platelet-Poor Plasma (PPP) is blood plasma with very low number of platelets (< 10 X 10 3 /μL). Traditionally, PPP was recommended for use in platelet aggregation studies to both adjust the platelet-rich plasma concentration, and to serve as a control. [1] PPP may have elevated levels of fibrinogen, which has the ability to form a fibrin-rich ...