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Aggregation

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Aggregation describes the accumulation of platelets in large numbers at the site of damage to form a haemostatic plug - the thrombus. It is the result of increased numbers of platelets arriving at the site, being rapidly activated, and interlinking via their pseudopodia.

Platelet activating factor, 5-HT, thrombin, ADP and thromboxane all contribute to the cascade. Initially, platelets are loosely bound by a fibrinogen cross-link; this is reinforced by thrombospondin.

Aggregation seems dependent on the close interaction of local arachidonic acid metabolites which aspirin modulates to therapeutic advantage.


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