Table 2.
Characteristics of the electrocardiogram for patients who come to the emergency department with acute chest pain, due to acute coronary syndrome (ACS; n = 130) or other causes (n = 504). I-STamp, ST amplitude in lead I; aVF-STamp, ST amplitude in lead aVF; V2-STamp, ST amplitude in lead V2; STamp38, ST amplitude at the end of the third out of eight equal intervals between the ST-J point and the end of the T wave.
| ACS n (%) | Other causes n (%) | OR | 95% CI | |
| I-Stamp | ||||
| I-STamp > 50 and I-STamp38 > I-STamp | 7 (5.4) | 12 (2.4) | 2.4 | 0.94 – 6.3 |
| I-STamp < -100 and I-STamp38 < I-STamp | 7 (5.4) | 6 (1.2) | 4.9 | 1.6 – 15 |
| None of above | 116 (89.2) | 486 (96.4) | 1.0 | - |
| aVF-STampa | ||||
| aVF-STamp > 100 and aVF-STamp38 > aVF-STamp | 13 (10.1) | 4 (0.8) | 14 | 4.6 – 45 |
| aVF-STamp < -100 and aVF-STamp38 < aVF-STamp | 4 (3.1) | 3 (0.6) | 5.9 | 1.3 – 27 |
| None of above | 112 (86.8) | 497 (98.6) | 1.0 | - |
| V2-STampb | ||||
| V2-STamp > 200 and V2-STamp38 > V2-STamp | 17 (13.2) | 27 (5.4) | 3.0 | 1.5 – 5.7 |
| 100 < V2-STamp ≤ 200 and V2-STamp38 > V2-STamp | 26 (20.2) | 95 (18.9) | 1.3 | 0.78 – 2.1 |
| V2-STamp < -100 and V2-STamp38 < V2-STamp | 6 (4.7) | 5 (1.0) | 5.6 | 1.7 – 19 |
| None of above | 80 (62.0) | 376 (74.8) | 1.0 | - |
a One patient with ACS had missing value on aVF-STamp.
b Two patients (one with and one without ACS) had missing value on V2-STamp.