Utilization of Anticoagulation and Antiplatelet Therapies in Patients with Atrial Fibrillation and Acute Coronary Syndrome Undergoing Percutaneous Coronary Intervention

Autor: C. Patel, Madhu K. Natarajan, J.S. Paikin, Arastoo Mokhtari
Rok vydání: 2017
Předmět:
Zdroj: Canadian Journal of General Internal Medicine. 12
ISSN: 2369-1778
1911-1606
0140-6736
DOI: 10.22374/cjgim.v12i2.240
Popis: Background: The optimal antithrombotic regimen for patients with coexistent atrial fibrillation (AF) and coronary artery disease (CAD) requiring percutaneous coronary intervention (PCI) remains controversial.Methods: We performed a chart review of 2,645 consecutive patients with non-ST elevation or ST elevation myocardial infarction at a regional cardiac centre, to examine the clinical characteristics and discharge antithrombotic medications of patients with coexistent AF (known or new onset AF with CHADS2 ≥1), treated with PCI.Results: Among 2,645 patients, 94 eligible patients were analyzed and 30 (32%) were prescribed triple therapy (TT) at hospital discharge. CHADS2 score was the major predictor of the decision to prescribe TT (P =0.002).Conclusion: Approximately one-third of the patients with AF undergoing PCI were prescribed TT at hospital discharge. Clinicians are generally following national guidelines and internationally-developed consensus statements, and focus on stroke risk despite the risks of bleeding and insufficient evidence supporting the benefits of TT. RésuméContexte : Le régime optimal antithrombotique pour les patients atteints à la fois de fibrillation atriale (FA) et d’une coronaropathie nécessitant une angioplastie coronarienne percutanée (ACP) demeure controversé.Méthodologie: Dans un centre régional de cardiologie, nous avons examiné les dossiers médicaux de 2645 patients ayant subi un infarctus du myocarde avec ou sans sus‑décalage du segment ST. Le but consistait à analyser les caractéristiques cliniques des patients présentant une FA concomitante (ancienne ou nouvelle, avec un indice CHADS2 ≥ 1) traitée par ACP, et les médicaments antithrombotiques prescrits au moment de leur sortie de l’hôpital.Résultats: Parmi les 2645 dossiers, 94 patients admissibles ont été analysés. Trente (32 %) s’étaient vus prescrire une trithérapie (TT) à leur sortie de l’hôpital. L’indice CHADS2 était le principal indicateur prévisionnel pris en compte dans la décision de prescrire la TT (P = 0,002).Conclusion : Environ un tiers des patients atteints de FA et ayant subi une ACP se sont vus prescrire une TT à leur sortie de l’hôpital. En général, les cliniciens suivent les directives nationales et les protocoles consensuels élaborés à l’international et se concentrent sur le risque d’ictus, malgré les risques de saignements et le manque de données probantes soutenant les avantages d’une TT.BACKGROUNDDual antiplatelet therapy (DAPT) including Aspirin and a P2Y12 receptor antagonist is recommended for patients who undergo percutaneous coronary intervention (PCI) with stent implantation.1,2 DAPT is superior to oral anticoagulants (OAC) in preventing stent thrombosis, 3while OAC is superior to DAPT in reducing stroke in patients with atrial fibrillation (AF).4,5 It is estimated that 5–8% of patients sustaining an acute coronary syndrome (ACS) have concomitant AF.6,7 The optimal antithrombotic regimen for patients with coexistent AF and coronary artery disease (CAD) requiring PCI remains controversial. In patients with AF and CHADS2 stroke risk score ≥1, consensus statements suggest that triple therapy (TT), defined as a combination of DAPT + OAC, be utilized in patients undergoing PCI with ACS.8,9 However, there is data indicating no improved efficacy of treatment with TT compared with DAPT alone, while exposing patients to increased bleeding risk.7,10,11 Major bleeding has been proven to be independently associated with death in patients following an ACS.12 Therefore, balancing the thromboembolic and bleeding risk is critical in patients with a recent ACS.Large randomized trials have indicated that compared with warfarin, novel oral anticoagulants (NOAC’s) are at least as effective as, and are associated with reduced rates of major, fatal and intracranial bleeding in patients with non-valvular AF.13 Due to the favourable safety profile, NOACs are being evaluated against warfarin in patients with AF undergoing PCI. Three of these trials are ongoing (RE-DUAL PCI, AUGUSTUS, ENTRUST-AF-PCI),14–16 and the fourth is the recently published PIONEER AF-PCI trial, which showed that reduced-dose rivaroxaban combined with clopidogrel lowered the risk of bleeding compared with TT with warfarin.17Despite the emergence of these recent data, the highest risk patients remain excluded from large randomized trials, and thus sound clinical judgment will remain the cornerstone in caring for these patients. In the current study, we aim to describe the local practice patterns of clinicians making treatment decisions for patients with new or existing AF, who present with an ACS and undergo PCI.METHODSA retrospective and prospective chart review was performed on 2,645 consecutive patients presenting with ST elevation myocardial infarction (STEMI) and non-ST elevation myocardial elevation (NSTEMI) to 3 academic hospitals affiliated with McMaster University and 8 community hospitals located in Local Health Integrated Network (LHIN) 4, Ontario, Canada from January to December 2014. Of those, 1,458 patients had undergone PCI with stent implantation; and, 124 patients were identified to have concomitant AF (Figure 1). Inclusion criteria for our study were: admission to hospital for either STEMI or NSTEMI, known or new onset AF with CHADS2 ≥ 1, coronary angiography demonstrating at least one epicardial coronary artery with a ≥70% stenosis, and successful PCI with stent implantation. Patients who expired before discharge were excluded from the analysis. Clinical and demographic characteristics of patients were summarized. DAPT and TT groups were identified by reviewing medication records from discharge summaries or copies of discharge prescriptions. DAPT was defined as Aspirin plus clopidogrel (75 mg once daily) or ticagrelor (90 mg twice daily), while TT was defined as DAPT plus an OAC; including either warfarin or novel oral anticoagulants (NOAC). We analyzed the CHADS2 and ATRIA (Anticoagulation and Risk factors in Atrial fibrillation) scores according to treatment groups.18,19 Statistical analysis was performed using SAS/STAT version 9.3 (SAS Institute Inc., Cary, NC). Categorical data was compared using Chi-square testing. Continuous data comparison was performed applying the Wilcoxon test and Cochran-Armitage test for trends. A binary logistic regression model was developed to identify the clinical predictors of discharge groups based on their CHADS 2 and ATRIA scores (Figure 2 and Figure 3). The cut-off for statistical significance was a P-value of
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