Heparin-induced thrombocytopenia (HIT) is an adverse drug reaction characterized by thrombocytopenia and a high risk for venous or arterial thrombosis.1 It is caused by heparin-dependent, plateletactivating antibodies that recognize a “self” protein, platelet factor 4 (PF4), bound to heparin. The resulting platelet activation is associated with increased thrombin generation (Figure).2 Typically...

this study was performed to assess the clopidogrel activity in inhibition of platelet aggregation in suspected angina patients on a daily dosag of 75 mg of clopidogrel for at least 7 days. this clinical trial was conducted in the outpatients department of cardiology, post graduate medical institute, lady reading hospital, peshawar from 15th october 2007 to 20th december 2007. we included 105 su...

To find new anti-thrombotic agents, a natural amino acid was introduced into the 3-position of anti-platelet aggregation active 3S-tetrahydroisoquinoline-3-carboxylic acid (THIQA), and 20 novel dipeptide derivatives, 3S-tetrahydroisoquinoline-3-carboxyamino acids (6a-t), targeting the intestinal peptide transport system were provided. In vitro anti-platelet aggregation assay of 6a-t indicated t...

1-deamino-8-d-arginine vasopressin (desmopressin [DDAVP]) is clinically efficacious in patients with mild platelet function disorders but it is not known which mechanisms mediate this effect. Our aim was to evaluate the impact of in vivo DDAVP administration in these patients. We assessed von Willebrand factor (VWF), factor VIII, platelet activation and aggregation, platelet-dependent thrombin ...

We would like to suggest another factor, namely, that of decreased platelet aggregation, which may contribute to their observation. We studied platelet aggregation in 25 newly diagnosed patients with Parkinson's disease and 25 ageand sex-matched controls. None were diabetic, hypertensive, smokers, or on any treatment. Citrated blood was collected by venipuncture and centrifuged at 20Qg for 10 m...

BACKGROUND Genetic analysis of platelet mRNA may facilitate the diagnosis of disorders affecting the megakaryocytic-platelet lineage. Its use, however, is limited by the exceptionally small yield of platelet mRNA and the risk of leukocyte contamination during platelet preparation. METHODS We depleted platelet suspensions of leukocytes by filtration and used a PCR-based RNA amplification step ...

OBJECTIVE The purposes of this study were to (1) evaluate correlations among platelet, leukocyte, growth factor, and cytokine concentrations in canine platelet-rich plasmas (PRPs) produced from five different canine PRP-concentrating systems and (2) compare the effects of different activation protocols on platelet activation and growth factor release from one of these PRPs. METHODS PRP was ma...