Table 2.
Summary of the angiographic and procedural characteristics of the two groups
| Characteristics | STEMI (n = 372) | NSTEMI (n = 230) | t/χ2 | P |
|---|---|---|---|---|
| Right dominance, n (%) | 207 (55.6) | 141 (61.3) | 1.866* | 0.172 |
| Left main, n (%) | ||||
| Ostial/body | 239 (64.2) | 152 (66.0) | 0.211* | 0.646 |
| Distal bifurcation | 71 (19.1) | 64 (27.8) | 6.241* | 0.012 |
| 2/3-vessel disease, n (%) | ||||
| Long lesions in RCA or LCX | 136 (36.6) | 98 (42.6) | 2.189* | 0.139 |
| Long lesions in LAD | 36 (9.7) | 20 (8.7) | 0.162* | 0.687 |
| CTO in RCA, n (%) | 4 (1.1) | 21 (9.1) | 23.169* | <0.001 |
| Pre-PCI TIMI flow, n (%) | ||||
| Grade 0/1 | 249 (66.9) | 45 (19.6) | 127.638* | <0.001 |
| Grade 2 | 117 (31.5) | 93 (40.4) | 5.049* | 0.025 |
| Grade 3 | 6 (1.6) | 92 (40.0) | 153.667* | <0.001 |
| Post-PCI TIMI flow, n (%) | ||||
| Grade 0–2 | 29 (7.8) | 9 (4.0) | 3.617* | 0.062 |
| Grade 3 | 343 (92.8) | 221 (96.0) | ||
| Balloon only, n (%) | 4 (1.1) | 0 (0) | ||
| Bare metal stent, n (%) | 45 (12.2) | 10 (4.3) | 10.531* | 0.001 |
| 2-stent for distal LM lesions, n (%) | 31 (8.3) | 50 (21.7) | 21.935* | <0.001 |
| Stent in LM per patient | ||||
| Diameter (mm) | 3.43 ± 0.59 | 3.42 ± 0.37 | 0.189† | 0.850 |
| Length (mm) | 28.0 ± 12.6 | 30.0 ± 12.6 | –1.892† | 0.059 |
| IVUS guidance, n (%) | 13 (3.5) | 17 (7.4) | 4.588* | 0.033 |
| IABP support, n (%) | 77 (20.7) | 31 (13.5) | 5.034* | 0.025 |
| Thrombectomy, n (%) | 67 (18.0) | 19 (8.3) | 11.033* | <0.001 |
| Glycoprotein IIb/IIIa inhibitor, n (%) | 109 (29.3) | 59 (25.7) | 0.941* | 0.332 |
*χ2 values; †t values. STEMI: ST-segment elevation myocardial infarction; NSTEMI: Non-ST-segment elevation myocardial infarction; RCA: Right coronary artery; LCX: Left circumflex artery; LAD: Left anterior descending coronary artery; CTO: Chronic total occlusion; PCI: Percutaneous coronary intervention; TIMI: Thrombolysis in myocardial infarction; LM: Left main artery; IVUS: Intravenous ultrasound; IABP: Intra-aortic balloon pump.