Sociodemographic and clinical characteristics of study cohort (n = 208)
| Mean (SD) age | 65 (14) years |
|---|---|
| Male/female | 113/95 (54/46) |
| Race | |
| Black | 113 (54) |
| White | 81 (40) |
| Hispanic | 11 (5) |
| American Indian | 2 (1) |
| Asian | 1 (0.5) |
| History | |
| Angina | 129 (62) |
| Myocardial infarction | 78 (38) |
| Revascularisation (PTCA or CABG) | 55 (26) |
| Risk factors | |
| Hypertension | 145 (70) |
| Diabetes mellitus | 60 (29) |
| Current smoker | 51 (25) |
| Time to presentation (hours) | |
| ⩽ 6 | 121 (58) |
| > 6 ⩽ 12 | 47 (23) |
| > 12 ⩽ 24 | 28 (13) |
| > 24 | 8 (4) |
| Uncertain | 4 (2) |
| Predominant ECG feature on presentation | |
| Normal | 29 (14) |
| ST segment elevation2-150(pre-existing) | 4 (2) |
| Bundle branch block/paced rhythm with abnormal repolarisation | 25 (12) |
| ST segment depression2-150 | 22 (11) |
| T wave inversion2-150 | 72 (35) |
| Other non-specific T wave or ST segment abnormalities | 56 (27) |
| Ongoing pain at presentation | 147 (71) |
Values are n (%) unless stated.
↵2-150 ⩾1 mm in two contiguous leads.
PTCA, percutaneous transluminal coronary angioplasty; CABG, coronary artery bypass graft.