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Complex Disease, Partial Revascularization, and Adverse Outcomes in Patients Treated With Long-Term Warfarin Therapy Who Underwent Percutaneous Coronary Intervention.
American Journal of Cardiology 2015 August 2
Patients treated with warfarin who undergo percutaneous coronary intervention (PCI) present a difficult therapeutic problem. Their baseline demographics, procedural characteristics, and 12-month outcomes are poorly defined. We conducted a retrospective analysis of all patients who underwent PCI at a major UK Cardiac Center from 2012 to 2013. Of the 2,675 patients who underwent PCI, 155 were on long-term warfarin treatment (5.8%). Patients on warfarin were older and more likely to have significant co-morbidity than those not on warfarin. The modified Mehran bleed score was higher in patients treated with warfarin versus those not treated (19.0 ± 5.8 vs 15.4 ± 8.0, p = 0.004). Baseline SYNTAX scores were higher in the patients treated with warfarin (18.5 ± 9.1 vs 12.4 ± 3.8, p = 0.0006) as were residual SYNTAX scores (8.3 ± 1.1 vs 3.8 ± 5.9, p = 0.001). Bare metal stents were more frequently used in warfarin-treated patients than those not treated (44.8% vs 26.3%, p <0.0001). Antiplatelet monotherapy was prescribed after PCI in 14.4% of patients treated with warfarin and 0.7% of non-warfarin (p <0.0001), whereas average dual anti-platelet therapy duration was also significantly shorter (4.3 vs 10.7 months, p <0.0001). At 1-year follow-up, target-vessel revascularization (6.5% vs 3.3%, p <0.05), stent thrombosis (5.0% vs 2.6%, p = 0.14), death (10.1% vs 4.6%, p <0.01), and target-vessel revascularization/stent thrombosis/death (21.6% vs 10.5%, p = 0.004) were all more common in the warfarin cohort. In conclusion, patients treated with warfarin who need PCI are a complex cohort, more likely to receive incomplete revascularization, less intense, and shorter durations of antiplatelet therapy, and have adverse 1-year outcomes. More trials of both current DES and newer DES technologies in warfarin-treated patients are needed.
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