Table 2.
Procedural characteristics of primary PCI in patients hospitalized with STEMI.
| Primary PCI | ||||
| Characteristics | Total (n = 32,929) | Primary PCI< 12 h (n = 28,280) | Primary PCI 12–24 h (n = 4649) | P value |
| Symptom-to-admission time∗, h | 4.0 (2.0, 8.0) | 3.9 (2.0, 6.7) | 14.9 (7.0, 24.3) | <0.001 |
| Multivessel CAD | 14,936 (45.4) | 12,739 (45.0) | 2197 (47.3) | 0.005 |
| Culprit vessel location | <0.001 | |||
| LM | 277 (0.8) | 225 (0.8) | 52 (1.1) | |
| LAD | 14,564 (44.2) | 12,444 (44.0) | 2120 (45.6) | |
| LCX | 3557 (10.8) | 3044 (10.8) | 513 (11.0) | |
| RCA | 13,313 (40.4) | 11,557 (40.9) | 1756 (37.8) | |
| Others | 717 (2.2) | 592 (2.1) | 125 (2.7) | |
| Uncertain | 501 (1.5) | 418 (1.5) | 83 (1.8) | |
| Number of narrow coronary arteries† | 0.006 | |||
| Nonobstructive CAD, < 50% | 381 (1.3) | 311 (1.2) | 70 (1.7) | |
| 1 | 15,955 (54.5) | 13,765 (54.9) | 2190 (52.5) | |
| 2 | 5890 (20.1) | 5010 (20.0) | 880 (21.1) | |
| ≥3 | 7040 (24.1) | 6005 (23.9) | 1035 (24.8) | |
| Door-to-balloon time‡, min | 60.0 (33.0, 105.0) | 58.0 (32.0, 98.0) | 90.0 (43.0, 240.0) | <0.001 |
| < 90min | 18,206 (70.4) | 16,746 (72.8) | 1460 (50.8) | <0.001 |
| Vascular access§ | 0.065 | |||
| Transradial access | 30,035 (92.7) | 25,842 (92.9) | 4193 (91.9) | |
| Transfemoral access | 2235 (6.9) | 1884 (6.8) | 351 (7.7) | |
| Others | 115 (0.4) | 97 (0.3) | 18 (0.4) | |
| Thrombus aspiration | 8094 (24.6) | 7157 (25.3) | 937 (20.2) | <0.001 |
| Implantation of stents|| | 0.596 | |||
| Yes | 29,619 (90.0) | 25,447 (90.0) | 4172 (89.7) | |
| No | 3307 (10.0) | 2830 (10.0) | 477 (10.3) | |
| Stent types ¶ | 0.001 | |||
| DES | 29,032 (98.8) | 24,968 (98.9) | 4064 (98.2) | |
| BMS | 190 (0.6) | 149 (0.6) | 41 (1.0) | |
| others | 161 (0.5) | 129 (0.5) | 32 (0.8) | |
| Number of implanted stents∗∗ | 1.0 (1.0, 2.0) | 1.0 (1.0, 1.0) | 1.0 (1.0, 2.0) | 0.004 |
| Other procedures during hospitalization | ||||
| IABP†† | 487 (3.9) | 409 (3.7) | 78 (5.4) | 0.002 |
| PTCA‡‡ | 613 (53.7) | 536 (53.5) | 77 (55.0) | <0.001 |
| CABG | 155 (0.5) | 120 (0.4) | 35 (0.8) | 0.002 |
Data are presented as n (%) or median (interquartile range).
Symptom-to-admission time was not available for 4153 of 32,929 (12.6%) patients.
Number of narrowed coronary arteries was not available for 3663 of 32,929 (11.1%) patients.
Door-to-balloon time was not available for 7065 of 32,929 (21.5%) patients.
Vascular access was not available for 544 of 32,929 (1.7%) patients.
Implantation of stents was not available for 3 of 32,929 (0%) patients.
Stent type was not available for 236 of 29,619 (0.8%) patients with stent implantations.
Total number of implanted stents was not available for 78 of 11,222 (0.7%) patients with stent implantations who were enrolled after July 2017.
IABP was based on 12,364 patients enrolled since July 2017.
PTCA was based on 1142 patients without stent insertion who were enrolled after July 2017.
P values are for comparisons among the two groups using the Student's t-test, Wilcoxon's rank-sum test, or χ2 test. BMS: Bare-metal stent; CAD: Coronary artery disease; CABG: Coronary artery bypass graft; DES: Drug-eluting stent; IABP: Intra-aortic balloon pump; LAD: Left anterior descending; LCX: Left circumflex; LM: Left main; PCI: Percutaneous coronary intervention; PTCA: Percutaneous transluminal coronary angioplasty; RCA: Right coronary artery; STEMI: ST-segment elevation myocardial infarction.