title: Platelet dysfunction induced by parenteral carbenicillin and ticarcillin. Studies of the dose-response relationship and mechanism of action in dogs.
abstract: Sequential studies of platelet function were performed in dogs receiving continuous intravenous carbenicillin (CARB) or ticarcillin (TIC). Dose- and time-dependent platelet dysfunction was uniformly observed during the administration of CARB or TIC, 250 to 1000 mg/kg/24 hr. ADP-induced primary and secondary platelet aggregation was markedly inhibited within 24 to 48 hours in dogs receiving 750 or 1000 mg/kg/24 hr, but maximum impairment of aggregation did not occur until 3 to 5 days in dogs receiving 250 or 500 mg/kg/24 hr. Platelet glass bead column retention was abnormal in all dogs studied, and platelet factor 3 availability was impaired in 91%. Collagen-induced platelet aggregation was consistently impaired and the bleeding time was prolonged only during the infusion of greater than or equal to 750 mg/kg/24 hr. Plasma fibrinogen concentrations and thrombin times remained normal. CARB and TIC infusions resulted in inhibition of 14C-serotonin release and slightly decreased platelet ADP, while serotonin, ATP, and ultrastructure remained unchanged. The mutual correction of abnormal platelet aggregation by mixing CARB or TIC platelets with aspirin-treated platelets suggested that CARB and TIC inhibited the platelet release reaction by a mechanism other than inhibition of platelet cyclo-oxygenase. The platelet inhibitory properties of CARB and TIC demonstrated in this study suggest that they may be useful antithrombotic agents.
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000818:Animals; D001779:Blood Coagulation Factors; D001791:Blood Platelet Disorders / Q000139:chemically induced*; D001792:Blood Platelets / Q000187:drug effects*; D002228:Carbenicillin / Q000009:adverse effects* / Q000494:pharmacology; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D006801:Humans; D066298:In Vitro Techniques; D010406:Penicillins / Q000009:adverse effects*; D010974:Platelet Aggregation / Q000187:drug effects; D013982:Ticarcillin / Q000009:adverse effects* / Q000494:pharmacology
chemical_list: D001779:Blood Coagulation Factors; D010406:Penicillins; D000244:Adenosine Diphosphate; D013982:Ticarcillin; D002228:Carbenicillin