Limitations
This was a retrospective study. ICD-10 codes do not specify the involved coronary artery, the location, severity, or complexity of the coronary lesions. The type and the intensity of the medical therapy, core laboratory and the exact ejection fraction were not provided. The details of the procedures, such door-to-intervention time, duration of the procedure, etc. could not be assessed. Furthermore, the reason why patients underwent SR vs PR could be determined. Long term outcomes could not be assessed.