2021 年 68 巻 2 号 p. 97-106
Summary: Background: The combination of dual antiplatelet therapy (DAPT) plus warfarin in atrial fibrillation (AF) patients after coronary stenting has been reported to confer a significant risk of bleeding complications. Direct oral anticoagulants (DOAC) reduce the risk of stroke and bleeding complications in AF patients compared to warfarin. The optimal anticoagulation strategy for Japanese non-valvular AF patients after coronary stenting remains unclear.
Methods: A total of 3230 patients who underwent coronary stenting were retrospectively reviewed. Of these, 284 cases (8.8%) were complicated by AF. Following coronary stenting, 222 patients received triple antithrombotic therapy (TAT) by DAPT plus oral anticoagulants; 121 patients received DAPT plus warfarin, and 101 patients received DAPT plus DOAC. We compared the clinical data between the two groups.
Results: The median International normalized ratio (INR) in the DAPT plus warfarin group was 1.61. Bleeding complications occurred in both groups. No cerebral infarction occurred in the DAPT plus DOAC group, while 4.1% of the DAPT plus warfarin group experienced cerebral infarction during follow-up (P=0.04). Twelve-month freedom from cerebral infarction, myocardial infarction, and cardiovascular death was significantly higher in the DAPT plus DOAC group than in the DAPT plus warfarin group [100% vs. 93.4%, P=0.009].
Conclusions: DOAC might be an optimal selection as an oral anticoagulant for Japanese AF patients who are receiving DAPT after PCI. A larger, longitudinal follow-up should be performed to clarify the clinical advantage of DOAC over warfarin, including among patients who receive single antiplatelet after coronary stent implantation.
