Great controversy erupted after the report of the EXCEL trial of percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) in patients with left main disease. I discussed it in this space in a piece I called, “What's Right about Left Main?” Much of that controversy was over the definition of periprocedural myocardial infarction (MI) used as a part of the composite endpoint of the trial.