FIGURE 1.

ST‐segment elevation myocardial infarction (STEMI) patients’ care course and treatment intervals by location of diagnosis. Within the 3 emergency department STEMI patient subcohorts, *denotes when a patient's PCI center ED arrival time may occur at varying points along the STEMI care pathway. Within each subcohort panel sample sizes (N) on the left represent patients whose medical course included evidence they had the STEMI care event: (1) first or screening ECG, (2) diagnostic ECG (which may also be the screening ECG), (3) cath lab activation, 4) cath lab arrival, (5) PCI; sample sizes (n) on the right represent patients with documented timestamps for the beginning and end of each care interval, thus permitting the measure of (1) screening‐ECG‐to‐diagnostic‐ECG, (2) diagnostic‐ECG‐to‐cath lab activation, (3) cath‐lab‐activation to cath‐lab‐arrival, and (4) cath‐lab‐arrival‐to‐balloon‐times. EMS, emergency medical services; PCI, percutaneous coronary intervention; STEMI, ST‐segment elevation myocardial infarction