title: Influence of aspirin on platelet count and volume in humans.
abstract: Platelet volume and total platelet mass are parameters of platelet activity and have become a prognostic factor in coronary heart disease. We have studied the influence of aspirin on platelet count, volume and total platelet mass in vitro and in a randomized double-blind, placebo-controlled study in 20 healthy young male volunteers in vivo. Aspirin had no influence in vitro on either platelet count, volume or mass. Repeated blood sampling during a 7-day treatment with 250 mg aspirin daily showed an increased platelet count (7.3% on day 1, 3.0% on day 2, 6.8% on day 4 and 9.3% on day 7; p < 0.01) and total platelet mass (7.2, 5.0, 8.6 and 11.5% on days 1, 2, 4 and 7, respectively, p < 0.01). Aspirin treatment without repeated blood withdrawal had no effect. These data indicate that aspirin may affect the circulating platelet mass under certain conditions.
authors.affiliation: Internal Medicine, Kantonsspital, Chur, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Erhart
authors.forename: J H
authors.initials: JH
authors.lastname: Beer
authors.forename: W H
authors.initials: WH
authors.lastname: Reinhart
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001241:Aspirin / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects*; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D010976:Platelet Count / Q000187:drug effects; D013997:Time Factors
chemical_list: D016861:Cyclooxygenase Inhibitors; D010975:Platelet Aggregation Inhibitors; D001241:Aspirin