Among patients with chronic coronary syndrome (CCS) undergoing percutaneous coronary intervention (PCI), periprocedural myocardial infarction (MI) defined according to Academic Research Consortium (ARC)-2 and Society for Cardiovascular Angiography and Interventions (SCAI) criteria occurred 7 to 9 times less frequently, and was more predictive of cardiac death at 1 year, compared with the Third and Fourth Universal Definitions of Myocardial Infarction (UDMI), a new study shows.