Implications of Misclassification of Type 2 Myocardial Infarction on Clinical Outcomes.

Background: Patients with type 2 myocardial infarction (MI) are often classified under the diagnosis of non-ST-segment-elevation MI (NSTEMI) despite the significant differences in clinical characteristics, management, and outcomes between type 2 MI and type 1 NSTEMI. This may have significant implications that can lead to inaccurate assessment of quality measures by MI quality review programs.

Methods: A single-center retrospective study of 1224 patients discharged with the diagnosis of type 1 NSTEMI between January 2015 and September 2017.