Table 3.
Patient and System Characteristics by Chest Compression Fraction Category
| Average Chest Compression Fraction First Five Minutes of CPR Process Data |
|||||
|---|---|---|---|---|---|
| Total (n=2103) |
0–40% (n=201) |
41–60% (n=475) |
61–80% (n=768) |
81–100% (n=659) |
|
| Age – mean (SD) | 67.8 (16.5) | 68.6 (15.4) | 68.0 (16.4) | 67.8 (16.3) | 67.4 (17.1) |
| Male – n (%) | 1,286 (61.2%) | 128 (63.7%) | 301 (63.4%) | 449 (58.5%) | 408 (61.9%) |
| Public location – n (%) | 223 (10.6%) | 25 (12.4%) | 41 (8.6%) | 75 (9.8%) | 82 (12.4%) |
| Bystander witnessed – n (%) | 691 (32.9%) | 77 (38.3%) | 153 (32.2%) | 251 (32.7%) | 210 (31.9%) |
| Bystander CPR – n (%) | 744 (35.4%) | 55 (27.4%) | 149 (31.4%) | 285 (37.1%) | 255 (38.7%) |
| ALS first on scene – n (%) | 371 (17.6%) | 59 (29.4%) | 119 (25.1%) | 122 (15.9%) | 71 (10.8%) |
| ALS on scene – n (%) | 1,851 (88.0%) | 174 (86.6%) | 419 (88.2%) | 681 (88.7%) | 577 (87.6%) |
| No. of contributing agencies *– mean (SD) | 1.7 (0.5) | 1.8 (0.5) | 1.8 (0.5) | 1.8 (0.5) | 1.6 (0.5) |
| Epinephrine use noted – n (%) | 1,517 (72.1%) | 134 (66.7%) | 341 (71.8%) | 554 (72.1%) | 488 (74.1%) |
| CPR fraction – median (Q1, Q3) | 0.71 (0.55, 0.83) | 0.31 (0.25, 0.36) | 0.52 (0.48, 0.56) | 0.71 (0.65, 0.76) | 0.86 (0.83, 0.90) |
| Chest compression rate – median (Q1,Q3) |
110 (97, 122) | 101 (70, 118) | 108 (95, 122) | 111 (98, 122) | 112 (102, 123) |
| Time from 9-1-1 call to scene – median (Q1, Q3) |
5.4 (4.1, 7.1) | 5.8 (4.0, 7.8) | 5.2 (4.0, 6.9) | 5.4 (4.1, 7.1) | 5.5 (4.2, 7.1) |
| Time from 9-1-1 to AED on – median (Q1,Q3) |
8.5 (6.6, 11.2) | ||||
| Time from 9-1-1 call to first EMS shock assessment - median (Q1, Q3) |
9.6 (7.9, 12.2) | 10.3 (7.9, 14.2) | 9.4 (7.8, 12.1) | 9.6 (7.9, 12.3) | 9.7 (8.0, 11.9) |
| Any out-of-hospital shock – n (%) | 437 (20.8%) | 40 (19.9%) | 98 (20.6%) | 158 (20.6%) | 141 (21.4%) |
| Any out-of-hospital ROSC – n (%) | 509 (24.2%) | 36 (17.9%) | 93 (19.6%) | 192 (25.0%) | 188 (28.5%) |
| Survived to hospital discharge – n (%) | 42 (2.0%) | 8 (4.0%) | 8 (1.7%) | 15 (2.0%) | 11 (1.7%) |
SD indicates standard deviation; CPR, cardiopulmonary resuscitation; ALS, Advanced Lite Support; Q1, Q3, the 1st and 3rd quartiles; EMS, emergency medical services;and ROSC, return of spontaneous circulation.
*
Information was only available about the first four EMS units at the scene.