Investigation of the interaction of blood platelets with the coagulation system at the site of plug formation in vivo in man--effect of low-dose aspirin.

Abstract:

:In 7 healthy volunteers, formation of thrombin (represented by fibrinopeptide A (FPA) generation, alpha-granule release (represented by beta-thromboglobulin [beta TG] release) and the generation of thromboxane B2 (TxB2) were measured in vivo in blood emerging from a template bleeding time incision. At the site of plug formation, considerable platelet activation and thrombin generation were seen within the first minute, as indicated by a 110-fold, 50-fold and 30-fold increase of FPA, TxB2 and beta TG over the corresponding plasma values. After a further increase of the markers in the subsequent 3 minutes, they reached a plateau during the fourth and fifth minute. A low-dose aspirin regimen (0.42 mg X kg-1 X day-1 for 7 days) caused greater than 90% inhibition of TxB2 formation in both bleeding time blood and clotted blood. At the site of plug formation, alpha-granule release was substantially reduced within the first three minutes and thrombin generation was similarly inhibited. We conclude that (a) marked platelet activation and considerable thrombin generation occur in the early stages of haemostasis, (b) alpha-granule release in vivo is partially dependent upon cyclo-oxygenase-controlled mechanisms and (c) thrombin generation at the site of plug formation is promoted by the activation of platelets.

journal_name

Thromb Haemost

authors

Kyrle PA,Westwick J,Scully MF,Kakkar VV,Lewis GP

subject

Has Abstract

pub_date

1987-02-03 00:00:00

pages

62-6

issue

1

eissn

0340-6245

issn

2567-689X

journal_volume

57

pub_type

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