Table 3.
Patient characteristics according to an observable increase in AMSA during resuscitation.
| Variable | No AMSA increase | AMSA increase | p-value |
|---|---|---|---|
| n = 324 | n = 254 | ||
| Age (IQR) (years) | 68.5 (58–78) | 68 (55–76) | 0.24 |
| Number of shock (IQR) | 1 (1–3) | 5 (3–7) | <0.001 |
| Epinephrine (IQR) (mg) | 5 (3–6) | 4.5 (3–6) | 0.88 |
| EMS arrival time | 9.5 (6.9–13.8) | 9.3 (6.9–13) | 0.44 |
| Male gender (%) | 231 (71) | 249 (98) | <0.001 |
| Home location (%) | 223 (69) | 191 (75) | 0.17 |
| Medical aetiology (%) | 306 (94) | 254 (100) | 0.01 |
| Witnessed event (%) | 222 (68) | 203 (80) | 0.01 |
| Bystanders CPR (%) | 217 (67) | 197 (77) | 0.03 |
| Telephone CPR (%) | 161 (50) | 155 (61) | 0.02 |
| Shockable presenting rhythm (%) | 175 (54) | 197 (77) | <0.001 |
| Rhythm conversion from non-shockable to shockable (%) | 149 (46) | 57 (23) | <0.001 |
| Mechanical CPR (%) | 213 (66) | 176 (69) | 0.42 |
| 30-day survival with CPC ≤ 2 | 33 (10) | 41 (16) | 0.03 |