title: Platelet reactivity: a contribution to age dependence studies.
abstract: The authors examined 230 healthy donors (20-90 years) as to basic biochemical and haematological parameters and those parameters characterizing the function of blood platelets. Besides well known age dependences of fibrinogen concentration, AT III, erythrocyte sedimentation, glucose, cholesterol, alpha-2-macroglobulin and circulating immunocomplexes the results are presented showing a pronounced dependence of primary haemostatic system upon age. Within the age groups 65-75 years and those above 75 years there was a significantly higher amount of circulating aggregates (increase up to 152%), elevated concentration of beta-thromboglobulin and F VIII R:Ag. The increased reactivity of platelets is detectable even by applying relatively simple tests such as the determination of heparin-neutralizing activity, aggregation response to lower concentrations of induces or the determination of the amount of circulating aggregates.
authors: Department of Clinical Biochemistry, General Hospital, Nový Jicin, CSSR.
authors: M
authors: M
authors: Parízek
authors: P
authors: P
authors: Kubisz
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000097:blood*; D001780:Blood Coagulation Tests; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010974:Platelet Aggregation; D010976:Platelet Count; D010979:Platelet Function Tests