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.