Table 1.
Characteristics for patients admitted for primary percutaneous coronary intervention
| GEMS (n = 1220) | HEMS (n = 384) | Total (n = 1604) | Missing | P value | |
|---|---|---|---|---|---|
| Gender, n (%) | 0 | 0.75 | |||
| Male | 889 (72.9) | 283 (73.7) | 1172 (73.1) | ||
| Age, median (IQR) | 64 (55–73) | 64 (55–71) | 64 (55–72) | 0 | 0.96 |
| Age, n (%) | 0 | 0.50 | |||
| 18–60 years | 514 (42.1) | 157 (40.9) | 671 (41.8) | ||
| 61–67 years | 267 (21.9) | 95 (24.7) | 362 (22.6) | ||
| ≥68 years | 439 (36.0) | 132 (34.4) | 571 (35.6) | ||
| Diabetes, n (%) | 63 | 0.08 | |||
| Yes | 150 (12.8) | 34 (9.3) | 184 (11.9) | ||
| Hypertensiona, n (%) | 99 | 0.32 | |||
| Yes | 464 (40.5) | 135 (37.5) | 599 (39.8) | ||
| Hyperlipidaemiaa, n (%) | 231 | 0.58 | |||
| Yes | 311 (29.6) | 90 (27.9) | 401 (29.2) | ||
| Active smokera, n (%) | 158 | 0.42 | |||
| Yes | 520 (47.1) | 170 (49.7) | 690 (47.7) | ||
| Previous myocardial infarction, n (%) | 108 | 0.35 | |||
| Yes | 102 (8.9) | 38 (10.7) | 140 (9.4) | ||
| Inter‐hospital transfer, n (%) | 22 | <0.0001 | |||
| Yes | 428 (35.4) | 69 (18.4) | 497 (31.4) | ||
| Resuscitated cardiac arrest, n (%) | 139 | 0.85 | |||
| Yes | 82 (7.4) | 25 (7.1) | 107 (7.3) | ||
| Acute cardiac failure, n (%) | 288 | 0.09 | |||
| Yes | 48 (4.8) | 8 (2.6) | 56 (4.3) | ||
| Fulltime work before event (37 h/week), n (%) | 0 | 0.06 | |||
| Yes | 508 (41.6) | 139 (36.2) | 647 (40.3) | ||
| Work ability, n (%) | 0 | 0.04 | |||
| Full work ability | 563 (46.2) | 150 (39.1) | 713 (44.5) | ||
| Reduced work ability | 46 (3.8) | 24 (6.3) | 70 (4.4) | ||
| Involuntary early retirement | 124 (10.2) | 41 (10.7) | 165 (10.3) | ||
| Retirement | 435 (35.7) | 146 (38.0) | 581 (36.2) | ||
| Voluntary early retirement | 52 (4.3) | 23 (6.0) | 75 (4.7) | ||
| Acute PCI performed, n (%) | 1 | 0.95 | |||
| Yes | 999 (81.89) | 315 (82.03) | 1314 (81.92) | ||
| Door‐to‐balloon time (min)b, median (IQR) | 32 (26–40) | 31 (25–40) | 32 (26–40) | 411 | 0.57 |
| Time from diagnostic ECG to arrival at the PCI centre (min), median (IQR) | 78 (56–107) | 71 (60–86) | 75 (57–100) | 490 | 0.0037 |
| Transport distance (km), median (IQR) | 77 (49–110) | 110 (98–133) | 94 (54–111) | 86 | <0.0001 |
| Use of vasopressor, n (%) | 139 | 0.20 | |||
| Yes | 46 (4.1) | 9 (2.5) | 55 (3.8) | ||
| Time of Diagnostic ECG, n (%) | 449 | <0.0001 | |||
| Night (20:01–07:59) | 355 (40.3) | 19 (6.9) | 374 (32.4) | ||
| Day (8:00–20:00) | 525 (59.7) | 256 (93.1) | 781 (67.6) | ||
GEMS, ground emergency medical services; HEMS, helicopter emergency medical services; IQR, interquartile range; PCI, percutaneous coronary intervention; ECG, electrocardiogram.
a
Defined by the treating physician.
b
Defined as the time from arrival at the PCI centre to time of inflation of the first balloon in the coronary artery lesion in the cardiac catheterization laboratory.