A Novel Strategy For Personalized Long-Term Dual Antiplatelet Therapy (RAPID EXTEND PILOT STUDY)

Phase 4TerminatedNCT03224923

Ottawa Heart Institute Research Corporation5 enrolled

Overview

In patients with heart attacks, the current standard of care is to restore blood flow through percutaneous coronary intervention (PCI). This is done using stents (metal meshes) that opens up blockages. Following PCI, standard preventative drug treatment includes the use of dual antiplatelet therapy (DAPT) using both aspirin and a platelet P2Y12 receptor inhibitor (Ticagrelor 90 mg twice a day or Clopidogrel 75 mg once a day) for one year to prevent clotting that can result in additional heart attacks, sudden clotting of stents or death. New studies have shown that there is a benefit to continuing DAPT beyond this one year mark. Longer-term DAPT has been shown to reduce ischemic events (heart attack, stroke) but increase the risk of bleeding. Present guidelines state that the decision to continue DAPT beyond the one year mark should be made on an individualized basis. The present study is a "pilot study" that seeks to compare Long-Term use of Ticagrelor (LTT) versus a Personalized Approach (PA). We will be recruiting patients who have been stable (free of ischemic or bleeding outcomes) on DAPT for 1 year after initial presentation with a heart attack. The PA group will use a modified DAPT score based on patient demographics to decide whether treatment is warranted. Patient will also undergo bedside genetic testing to identify potential at-risk genes. Those identified as carriers will be treated with ticagrelor while non-carriers will be treated with clopidogrel. The present study will determine whether a personalized approach will decrease bleeding versus an approach of universal ticagrelor use. The hypothesis is that patients receiving a personalized strategy will have a decreased risk of bleeding.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Eligibility

Sex: ALLMin age: 50 Years

Medical Language ↔ Plain English

Inclusion Criteria: * non-ST-elevation myocardial infarction (NSTEMI) or ST-elevation myocardial infarction (STEMI) at presentation for index PCI who have successfully completed \>1-year follow-up of RAPID MANAGE or TAILOR-PCI trials without having incurred an ischemic or bleeding outcome while on DAPT * Patients with DAPT interruption after 1 year will be eligible, if within 3 years of index MI Patients must also have 1 of the following atherothrombotic risk enrichment criteria: * age ≥ 65 years * diabetes * 2nd prior MI (\> 1 year ago) * multi-vessel coronary disease * Creatinine Clearance \< 60mL/min Exclusion Criteria: Patients will be excluded from the study if they: * refuse consent * are \> 3 years post MI * are deemed to require a P2Y12 inhibitor * require oral anticoagulation * have a history of stroke, transient ischemic attack (TIA) or intracranial bleed * have had a recent GI bleed or major surgery * have a life expectancy of \< 1 year * have a platelet count \< 100,000/μl * have a bleeding diathesis * have hematocrit \< 30% or \> 52% * are on dialysis or have severe liver disease * are at risk for bradycardia

Outcomes

Primary Outcomes

Proportion of Patients with Decreased Bleeding Risk

The primary endpoint is the proportion of patients with low on-treatment platelet reactivity (LPR) in the PA group compared to the LTT group at 1 month. * P2Y12 reactivity units (PRU) as a continuous variable will be measured using a VerifyNow P2Y12 assay * a PRU value of \< 85 is associated with increased bleeding risk

Time frame: 1 month

Secondary Outcomes

Platelet Reactivity Index (PRI) as a continuous variable

Platelet function as measured by Vasodilator-stimulated phosphoprotein (VASP) * a PRI of \< 16% is associated with increased bleeding risk

Time frame: 1 month

ADP-induced Aggregation (AU) as a continuous variable

Platelet function as measured by Multiplate analyzer * an AU of \< 19 is associated with increased bleeding risk

Time frame: 1 month

Bleeding according to Bleeding Academic Research Consortium (BARC) criteria

the incidence and severity of bleeding as defined by BARC classification system