Table 3.
Prehospital 12-lead ECG indices in individuals with non-traumatic chest pain suggestive of acute coronary syndrome transported by ambulance to the emergency department (N=3,646).
| Electrocardiographic findings | n(%) |
|---|---|
| Rhythm | |
| Normal sinus rhythm | 2819(77.3) |
| Atrial fibrillation/flutter | 522(14.3) |
| Junctional rhythm | 47(1.3) |
| Ventricular paced | 62(1.7) |
| 2nd degree heart block | 10(0.3) |
| 3rd degree heart block | 40(1.1) |
| SVT | 91(2.5) |
| VT | 11(0.3) |
| Multifocal atrial tachycardia | 2(0.1) |
| PVC | 323(8.9) |
| Other | 177(4.9) |
| QRS morphology | |
| Normal | 2895(79.4) |
| RBBB | 282(7.7) |
| LBBB | 136(3.7) |
| LAFB | 234(6.4) |
| LPFB | 34(0.9) |
| IVCD | 141(3.9) |
| Early repolarization | 182(5.1) |
| LVH (Cornell voltage criteria) | 226(6.3) |
| LVH with strain | 325(9.1) |
| LVH by other criteria (e.g., Sakolov) | 35(0.9) |
| Prior myocardial infarction location | |
| Inferior | 142(3.9) |
| Anterior | 150(4.1) |
| Lateral | 27(0.7) |
| Septal | 81(2.2) |
| ECG Feature of acute ischemia | |
| ST-elevation | 923(25.7) |
| ST-depression | 1061(29.5) |
| T-wave inversion | 1126(31.3) |
| Hyperacute T-wave | 28(0.8) |
| Non-specific ST-T wave | 486(13.5) |
SVT=supraventricular tachycardia, VT=ventricular tachycardia, PVC=premature ventricular contraction, RBBB=right bundle branch block, LBBB=left bundle branch block, LAFB=left anterior fascicular block, LPFB=left posterior fascicular block, IVCD=intraventricular conduction delay. Due to missing data, total N is less than 3,646 for the following variables: Early repolarization N=3,560, ST-elevation N=3,597, ST-depression N=3,594, T-wave inversion & non-specific ST-T wave N=3,593, Hyperacute T-wave N=3,596.
*
Groups are not mutually exclusive.