An assessment of platelet response to ticagrelor in post-percutaneous coronary intervention patients using light transmission platelet aggregometry (LTA)

Background: Low on- treatment platelet reactivity (LTPR) or High on-treatment platelet reactivity (HTPR) with P2Y12 inhibitors is associated with bleeding (LTPR) or ischemic events (HTPR) in patients on dual antiplatelet therapy (DAPT) after percutaneous coronary intervention (PCI). Objective: Mapping of Indonesian patients' platelet response secondary to ticagrelor and thus identifying either LTPR or HTPR. Method: During May - June 2019, 20 post-PCI patients on aspirin- ticagrelor combination were included. Light transmission aggregometry (LTA) for monitoring platelet function was used. Ticagrelor's LTA <40% is LTPR while >70% is HTPR. Result: Patients were mostly male ( 18 patients) and aged between 40-73 years old with a history of diabetes and/or hypertension and smoking. About eight patients (40%) were LTPR and one (5%) patient was HTPR. Conclusion: A personalised DAPT strategy for preventing bleeding events, a de-escalation, might be valuable for Indonesian patients.