Abstract

Acute coronary syndrome and atrial fibrillation are both common and can occur in the same patient. Combination therapy with dual antiplatelet therapy and oral anticoagulation increases risk of bleeding. Where the two conditions coexist, careful consideration is needed to determine the optimal antithrombotic treatment to reduce the risks of future ischaemic events associated with both conditions. Choices can be made in intraprocedural anticoagulation, type and dosing of oral anticoagulant, duration of combination therapy, and selection of P2Y12 inhibitor including genetic testing. This review article provides an overview of the available evidence to support clinicians in finding the delicate balance between antithrombotic efficacy and bleeding risk in patients with acute coronary syndrome and atrial fibrillation.

Highlights

  • Acute coronary syndrome (ACS) and atrial fibrillation (AF) are both common and can occur in the same patient

  • A study comparing patients with AF undergoing primary percutaneous coronary intervention (PCI) for ST-elevation myocardial infarction (STEMI) found no difference with regards to in-hospital major bleeding between patients admitted without oral anticoagulation (OAC) and those admitted on chronic vitamin K antagonists (VKA) or nonvitamin K antagonist oral anticoagulants (NOACs) treatment (13.2% vs. 13.0% vs. 11.6%, respectively, p = 0.57) [47]

  • Patients with concomitant AF and ACS are at higher risk of bleeding, due to the need for combined antithrombotic therapy

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Summary

Introduction

Acute coronary syndrome (ACS) and atrial fibrillation (AF) are both common and can occur in the same patient. Up to 36% of patients with AF have concomitant coronary artery disease (CAD) amongst whom 45% have prior MI [3,4]. Treatment of ACS, with or without percutaneous coronary intervention (PCI), requires the administration of dual antiplatelet therapy (DAPT) to prevent recurrent MI and stent thrombosis (ST) [5,6]. There is a difference in antithrombotic treatment requirements between patients with AF and those with ACS, and where the two conditions coexist, careful consideration is needed to determine the optimal antithrombotic treatment to reduce the risks of future ischaemic events associated with both conditions [8,9].

Comparison of Antithrombotic Therapy for ACS and AF
Trials of Dual or Triple Antithrombotic Therapy for PCI with or without ACS
Design
Aspirin versus No Aspirin
NOAC versus VKA
Dose of NOAC
Duration of Dual or Triple Therapy
Choice of P2Y12 Inhibitor in Combination Antithrombotic Therapy
Genetic Testing
Dropping Aspirin or P2Y12 Inhibitor in Dual Therapy
Peri-Procedural Considerations for PCI
Intraprocedural Anticoagulation
Intraprocedural Antiplatelet Therapy
Postprocedure Anticoagulation on the ICU
Balancing Risks
Conclusions

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