Table 2. Baseline lesion and procedural characteristics.
| Unweighted population | Weighted population | ||||||||
| Total population (N=1,077) | Post-IVUS not done (n=239) | Post-IVUS done (n=838) | p-value | Total population (N=1,081) | Post-IVUS not done (n=241) | Post-IVUS done (n=840) | p-value | ||
| Target CTO location | Left anterior descending | 468 (43.5) | 75 (31.4) | 393 (46.9) | <0.001 | 468 (43.3) | 105 (43.5) | 363 (43.2) | 0.97 |
| Left circumflex | 140 (13.0) | 41 (17.2) | 99 (11.8) | 139 (12.9) | 30 (12.5) | 109 (13.0) | |||
| Right coronary | 466 (43.3) | 121 (50.6) | 345 (41.2) | 471 (43.5) | 105 (43.8) | 366 (43.6) | |||
| Graft | 3 (0.3) | 2 (0.8) | 1 (0.1) | 3 (0.3) | 1 (0.4) | 2 (0.2) | |||
| In-stent restenosis | 95 (8.8) | 12 (5.0) | 83 (9.9) | 0.02 | 97 (9.0) | 23 (9.6) | 74 (8.8) | 0.71 | |
| Multivessel disease | 615 (57.1) | 140 (58.6) | 475 (56.7) | 0.60 | 624 (57.7) | 142 (58.9) | 482 (57.4) | 0.67 | |
| Japanese CTO score | 1.9±1.1 | 1.9±1.1 | 1.9±1.1 | 0.41 | 1.9±1.1 | 2.0±1.1 | 1.9±1.0 | 0.22 | |
| Retrograde attempt | 228 (21.2) | 58 (24.3) | 170 (20.3) | 0.18 | 220 (20.4) | 57 (23.7) | 163 (19.4) | 0.15 | |
| Total CTO length, mm | 14.6±9.4 | 13.8±8.1 | 14.9±9.8 | 0.11 | 14.6±9.3 | 13.9±7.9 | 14.8±9.7 | 0.21 | |
| Total lesion length, mm | 41.8±20.4 | 40.8±20.8 | 42.1±20.2 | 0.42 | 42.0±20.1 | 41.9±19.7 | 42.1±20.2 | 0.91 | |
| Stent type generation | First-generation DES | 232 (21.5) | 85 (35.6) | 147 (17.5) | <0.001 | 233 (21.6) | 50 (20.7) | 183 (21.8) | 0.72 |
| Second-generation DES | 845 (78.5) | 154 (64.4) | 691 (82.5) | 848 (78.4) | 191 (79.3) | 657 (78.2) | |||
| Number of stents per lesion | 1.8±0.8 | 1.9±0.9 | 1.8±0.8 | 0.14 | 1.8±0.8 | 1.9±0.8 | 1.8±0.8 | 0.60 | |
| Stent length per lesion, mm | 53.2±24.1 | 52.5±25.0 | 53.4±23.8 | 0.61 | 53.5±24.0 | 54.2±24.6 | 53.3±23.8 | 0.63 | |
| Average stent diameter*, mm | 3.2±0.4 | 3.1±0.3 | 3.2±0.4 | <0.001 | 3.2±0.4 | 3.2±0.4 | 3.2±0.4 | 0.40 | |
| Adjunctive post-dilatation | 655 (60.8) | 133 (55.6) | 522 (62.3) | 0.06 | 658 (60.9) | 145 (60.1) | 54 (61.2) | 0.81 | |
| Final balloon size, mm | 3.3±0.6 | 3.1±0.7 | 3.4±0.6 | <0.001 | 3.3±0.6 | 3.3±0.7 | 3.3±0.6 | 0.51 | |
| Maximal inflation pressure, atm | 18.2±5.3 | 16.8±5.7 | 18.6±5.1 | <0.001 | 18.3±5.2 | 17.6±5.3 | 18.5±5.1 | 0.10 | |
| Data are shown as mean±standard deviation or number (%). *Average stent diameter was calculated using individual stent diameter value weighted by the stent length. CTO: chronic total occlusion; DES: drug-eluting stent; IVUS: intravascular ultrasound | |||||||||