title: Application of cationic propyl gallate as inducer of thrombocyte aggregation for evaluation of effectiveness of antiaggregation therapy.
abstract: OBJECTIVE
  Acetylsalicylic acid (ASA) is one of basic preparations used in the therapy of cardiovascular diseases. Application of ASA leads to irreversible reduction of platelet aggregation. The aim of the present study was to verify monitoring of effectiveness of ASA therapy using the measurement of platelet aggregability in vitro after induction by cationic propyl gallate (CPG), which is considered to be a highly potent inducer of aggregation.
  
  
  METHODS
  We examined a group of 27 healthy volunteers, divided into two subgroups (n = 19, n = 8). The first subgroup was examined for thrombocyte aggregation before and 24 hours after administration of 400 mg of ASA after induction by ADP, collagen, adrenalin and CPG. The second subgroup was examined for thrombocyte aggregation before and after a three-day administration of ASA in a dose of 100 mg/day.
  
  
  CONCLUSIONS
  In the group of 27 healthy volunteers we determined normal values of aggregability for individual inducers. Low stability of the used methods was proved (weak or insignificant correlation of results of the same method before and after administration of ASA). The most advantageous parameter for monitoring of effectiveness of 400 and 100 mg of ASA was CPG slope (paired t test, p < 0.00000002, resp. p < 0.001). The parameter of CPG slope we determined in both subgroups the cut-off value (< 53s), by means of which it is possible to discriminate probands according to ASA therapy (in contrast to other routinely used inducers). The obtained results indicate that measurement of thrombocyte aggregation after CPG induction reveals a significantly lower percentage of ASA non-responders ASA than after other inducers. Measurement of thrombocyte aggregation after CPG induction is predicted to be highly promising for monitoring the effectiveness of anti-aggregation therapy.
authors.affiliation: Department of Laboratory Medicine, Hospital Sternberk, Jivavska 20, 785 16 Czech Republic.
authors.forename: D
authors.initials: D
authors.lastname: Stejskal
authors.forename: J
authors.initials: J
authors.lastname: Prosková
authors.forename: A
authors.initials: A
authors.lastname: Petrzelová
authors.forename: J
authors.initials: J
authors.lastname: Bartek
authors.forename: I
authors.initials: I
authors.lastname: Oral
authors.forename: B
authors.initials: B
authors.lastname: Lacnák
authors.forename: D
authors.initials: D
authors.lastname: Horalík
authors.forename: S
authors.initials: S
authors.lastname: Sekaninová
mesh_terms: D000328:Adult; D001241:Aspirin / Q000494:pharmacology; D001792:Blood Platelets / Q000187:drug effects* / Q000502:physiology*; D002412:Cations / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D008875:Middle Aged; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D011435:Propyl Gallate / Q000494:pharmacology*
chemical_list: D002412:Cations; D010975:Platelet Aggregation Inhibitors; D011435:Propyl Gallate; D001241:Aspirin