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Background  Dual antiplatelet therapy with aspirin and thienopyridine is required after placement of coronary drug-eluting stents (DES) to prevent thrombotic complications. Current clinical guidelines recommend at least 6 to 12 months of treatment after a DES implantation, but it may be beneficial to apply dual antiplatelet therapy for a longer duration.    Methods/design  The optimal dual antiplatelet therapy (OPTIDUAL) study aims to compare the benefits and risks of dual antiplatelet therapy applied for either 12 or 48 months. We will examine the occurrence of major adverse cardiovascular and cerebrovascular events (MACCE) in patients undergoing percutaneous coronary intervention with DES for the treatment of coronary lesions. The OPTIDUAL study is an open-label multicenter, randomized, national trial that will include 1,966 patients treated with DES. All patients will be treated with dual antiplatelet therapy for 12 months (+/− 3). Then, patients with no MACCE or major bleeding will be randomized to receive either 36 additional months of clopidogrel plus aspirin or aspirin only. The primary end-point is the combination of death from all causes, myocardial infarction, stroke and major bleeding. The secondary end points include the individual components of the primary end-point, stent thrombosis, repeat revascularization of the treated vessel and minor bleeding.    Discussion  This randomized trial is designed to assess the benefits and safety of 12 versus 48 months of dual antiplatelet therapy in patients that receive a DES. We aim to determine whether substantial prolongation of clopidogrel (a thienopyridine) after DES implantation offers an advantage over its discontinuation.    Trial registration  ClinicalTrials.gov Identifier:  NCT00822536

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Efficacy and safety of 12 versus 48 months of dual antiplatelet therapy after implantation of a drug-eluting stent: the OPTImal DUAL antiplatelet therapy (OPTIDUAL) trial: study protocol for a randomized controlled trial