Century Clot-Guided Prophylactic Rivaroxaban for Post STEMI Complicating Left Ventricular Thrombus

STEMI - ST Elevation Myocardial Infarction

Century Clot analyzer; Prophylactic; Rivaroxaban; LVT; STEMI

To manage the ST-segment elevation myocardial infarction (STEMI) caused by plaque rupture, triggers platelet activation/aggregation and thrombin generation, requires dual (platelet and coagulation) pathway inhibition. However, triple antithrombotic therapy with standard dual antiplatelet therapy (DAPT) and oral anticoagulant (OAC) in the STEMI setting is a challenge, since that increase in potential risk of bleeding. Although the incidence of left ventricular thrombus (LVT) formation after STEMI decreased in modern reperfusion therapy, including primary percutaneous coronary intervention (PCI), remains at 4% to 26%, especially that complicated by anterior STEMI. The recommendation of an OAC prophylactic therapy for preventing LVT formation in current STEMI guidelines is limited. How to optimize antithrombotic therapy to balance the bleeding-thrombotic profile, and prevent LVT formation is challenging, since insufficient evidence is available from randomized trials. Century Clot analyzer is point-of-care testing that could assess the coagulate state: normal, hypo-coagulable, or hyper-coagulable states according to clot rate (CR) value. Whether Century Clot-guided rivaroxaban prophylactic therapy (2.5 mg twice daily, if the hypercoagulable state, defined as CR ≥24) in combination with standard DAPT could reduce LVT formation without increasing major bleeding is uncertain.

The Prophylactic Rivaroxaban Therapy for Post STEMI Complicating Left VENtricular Thrombus (PREVENT) study is designed to investigate the safety and efficacy of Century Clot-guided additional low-dose rivaroxaban plus DAPT as an optimal antithrombotic strategy for preventing LVT formation after anterior STEMI undergoing primary PCI. All eligible STEMI patients will be received standard DAPT (ticagrelor or clopidogrel plus aspirin). At post-PCI 12-24 hours, to be randomly assigned into Century Clot (CR)-guided rivaroxaban (2.5 mg twice daily for 1 month) in combination with DAPT and standard DAPT. Omitting rivaroxaban at post-PCI 1 month, and both groups are following a tailored-ticagrelor with dose reduction strategy (60 mg bid, or 45 mg bid if \<50 kg, ≥75 yrs) or clopidogrel (75 mg qd) plus aspirin (100 mg qd) for further 11 months. The clinical outcome is the incidence of LVT formation, and net adverse clinical events (NACEs, composite of cardiac death, non-fatal myocardial infarction, TVR/TLR, stroke, and major bleeding) at post-STEMI 1 month, as well as at 12-month clinical follow-ups. In PREVENT study, the investigators hypothesize that Century Clot (CR)-guided additional rivaroxaban prophylactic therapy could reduce LVT formation without increasing bleeding after anterior STEMI, when compared with standard DAPT.

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