ECG abnormalities and patient characteristics for patients suffering from out-of-hospital cardiac arrest according to whether the patients had cardiac disease when the cardiac arrest occurred
| Variable | Out-of-hospital cardiac patients with cardiac disease* | Out-of-hospital cardiac patients without cardiac disease* | Total |
| Count, no. | 1315 | 1352 | 2667 |
| Median age in years (Q1–Q3) | 75.3 [65.5, 82.3) | 69.5 [59.6, 78.4) | 72.5 [62.3, 80.7) |
| Male sex, no. | 834 (63.4) | 816 (60.4) | 1650 (61.9) |
| Median follow-up (Q1–Q3) | 1.9 [0.7, 4.0) | 1.7 [0.6, 3.7) | 1.8 [0.6, 3.8) |
| Atrial fibrillation | 287 (21.8) | 50 (3.7) | 337 (12.6) |
| Atrial flutter | 20 (1.5) | 3 (0.2) | 23 (0.9) |
| Cornell LVH | 145 (11.0) | 90 (6.7) | 235 (8.8) |
| Sokolow-Lyon LVH | 185 (14.1) | 154 (11.4) | 339 (12.7) |
| Left bundle branch block | 77 (5.9) | 47 (3.5) | 124 (4.6) |
| Non-specific intraventricular block | 71 (5.4) | 38 (2.8) | 109 (4.1) |
| Right bundle branch block | 89 (6.8) | 56 (4.1) | 145 (5.4) |
| Q-wave | 259 (19.7) | 172 (12.7) | 431 (16.2) |
| ST-depression without atrial fibrillation | 202 (15.4) | 107 (7.9) | 309 (11.6) |
| ST-depression with atrial fibrillation | 99 (7.5) | 18 (1.3) | 117 (4.4) |
| ST-elevation | 46 (3.5) | 20 (1.5) | 66 (2.5) |
All results are reported as the number of patients (%) unless otherwise specified.
Q1–Q3 1st+3rdquartiles.
*Cardiac disease at the time of the cardiac arrest: heart failure, ischaemic heart disease, prior myocardial infarction, cardiomyopathy, atrial fibrillation, atrial flutter, congenital heart disease, valvular heart disease, other cardiac arrhythmia, other cardiac disease.
LVH, left ventricular hypertrophy.