1. Presence of cardiac catheterization lab in the primary destination hospital with the ability to perform 24-7 emergent primary angioplasty; |
2. Fully affiliated teaching hospital; |
3. Is the ED on Time Consideration (TC) or deferral from ambulances based on workload of acutely ill or injured patients? |
4. Is the ED on Consideration (C) or deferral from ambulances based on workload? |
5. Weekday; |
6. Weekend; |
7. Time of day in 8 hour intervals (08:00-16:00, 16:00-24:00, 24:00-08:00); |
8. Age (as a continuous variable); |
9. Sex; |
10. History of MI; |
11. History of CABG; |
12. History of angioplasty; |
13. Location of STEMI (anterior, posterior, inferior); |
14. Off load delay (minutes); |
15. PCA or PCI or bypass surgery. |