Platelet aggregation, plasma betathromboglobulin (BTG) and platelet factor 4 (PF4) were studied in 35 children with dengue hemorrhagic fever. The suppression of platelet aggregation was demonstrated during acute phase of DHF in both shock and non-shock patients. Simultaneous with abnormal platelet aggregation, there was increased release of BTG and PF4 from platelets into plasma during the acute phase which lasted only 3-4 days after shock or subsidence of fever. Acute phase plasma during DHF infection was also shown to have a stimulatory effect on the aggregation of autologous platelets. In this study we showed that there was an increase in platelet secretory activity of BTG and PF4 along with an impairment of the platelet aggregation during acute phase of DHF.
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