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New Heart…New Rhythm

A 26-year-old female with a history of nonischemic dilated cardiomyopathy secondary to valvular disease from Marfan syndrome underwent an orthotopic heart transplant for stage D systolic heart failure with concurrent removal of her previously implanted defibrillator. Her posttransplant course was complicated by hyperacute rejection. Prior to hospital discharge, the following electrocardiogram (Fig. 1) was obtained. What is the diagnosis?