The primary aim of this study is to investigate the PD effects of switching from standard-dose clopidogrel dose to low-dose prasugrel versus continuing standard-dose clopidogrel in patients at dual-risk (HBR defined as the HBR-ARC criteria and HIR defined as ABCD-GENE score ≥10) following PCI. We hypothesize that in patients at dual-risk, switching from standard-dose clopidogrel to low-dose prasugrel will be superior to continuing standard-dose clopidogrel in terms of platelet reactivity.

Inclusion Criteria:

• Patients with high bleeding risk (defined according to the ARC-HBR criteria) who have undergone PCI and are on maintenance treatment with DAPT, consisting of low-dose aspirin (81mg qd) with clopidogrel (75 mg qd) as part of standard of care for at least 30 days.
• Age ≥18 years.
• Provide written informed consent.

Exclusion Criteria:

• Prior cerebrovascular event.
• PCI within 30 days.
• Hemodynamic instability.
• On treatment with any oral anticoagulant (vitamin K antagonists, dabigatran, rivaroxaban, apixaban, edoxaban) or chronic low-molecular-weight heparin (at venous thrombosis treatment, not for prophylaxis).
• Hypersensitivity to Aspirin, Clopidogrel, or Prasugrel.
• Known hematologic malignancies or thrombocytopenia (platelet count <80x106/mL).
• Known hemoglobinopathies or anemia (hemoglobin <9 g/dL)
• Pregnant and breastfeeding women [women of childbearing age must use reliable birth control (i.e., oral contraceptives) while participating in the study].

Individual patient data will be shared upon reasonable request to the primary investigator.

Individual patient data will be shared upon reasonable request to the primary investigator after publication of the primary results.

Individual patient data will be shared upon reasonable request to the primary investigator.