Platelet aggregation induced by ADP (8 μmol/L) or 25 μmol/L TRAP-14 mer peptide in citrated PRP prepared from patients receiving abciximab and tested at the sample times shown in Fig 1. Results are expressed as percent light transmission at 3 minutes of aggregation (maximal values) and are grouped together for samples taken during the infusion, and at periods less than 48 hours and greater than 48 hours after the drug administration ended. The P values for the observed inhibition were calculated with respect to the aggregation intensity before the onset of abciximab.