Table 2.
Comparison of vessel morphology between chronic total occlusion with coronary artery bypass graft, long-duration chronic total occlusion and short-duration chronic total occlusion without coronary artery bypass graft lesions
| CTO with CABG n = 34 (IQR) | Long-duration CTO n = 49 (IQR) | Short-duration CTO n = 12 (IQR) | P-value | |
|---|---|---|---|---|
| Vessel | ||||
| LAD/LCx/RCA, n (%) | 7 (20.6)/8 (23.5)/19 (55.9) | 13 (26.5)/9 (18.4)/27 (55.1) | 1 (8.3)/2 (16.7)/9 (75.0) | 0.64 |
| Location | ||||
| Proximal/middle/distal/branch, n (%) | 31 (91.2)/2 (5.9)/1 (2.9)/0 | 25 (51.0)/17 (34.7)/3 (6.1)/4 (8.2) | 9 (75.0)/3 (15.0)/0/0 | 0.01 |
| CTO length (mm) | 15 (11.3–30) | 15 (9–25.5)§ | 31.5 (15–49.5) | 0.01 |
| Vessel size | ||||
| Proximal EEL area | 12.99 (9.46–17.17)† | 10.02 (6.71–13.18) | 11.68 (10.03–18.78) | 0.001 |
| CTO EEL area | 9.58 (6.88–13.61)† | 6.48 (4.62–9.23)§ | 10.20 (7.25–13.40) | <0.001 |
| Distal EEL area | 7.20 (5.01–12.34)† | 4.23 (3.01–6.84) | 5.96 (2.47–8.85) | 0.001 |
| Proximal IEL area | 10.05 (8.30–15.71)† | 8.62 (5.95–10.76) | 9.09 (7.58–14.02) | 0.002 |
| CTO IEL area | 8.31 (5.85–11.98)† | 5.71 (3.91–7.85)§ | 8.52 (6.35–11.82) | <0.001 |
| Distal IEL area | 5.99 (4.11–9.77)† | 3.67 (2.38–5.75) | 5.11 (1.79–7.35) | <0.001 |
| Proximal % stenosis | 76.0 (69.4–86.6) | 79.5 (72.9–86.2) | 76.1 (62.8–82.7) | 0.62 |
| CTO % stenosis | 98.0 (95.8–99.2) | 98.6 (97.3–99.2)§ | 95.8 (90.6–97.9) | 0.006 |
| Distal % stenosis | 83.1 (76.5–88.6) | 84.2 (79.9–88.6) | 77.0 (70.2–84.4) | 0.09 |
| Microchannel (>200 μm) | ||||
| Mean number of microchannel in CTO | 0.5 (0.3–0.8) | 0.5 (0.3–0.8) | 0.7 (0.5–0.8) | 0.30 |
EEL, external elastic lumen; IEL, internal elastic lumen; CTO, chronic total occlusion; CABG, coronary artery bypass graft; RCA, right coronary artery.
†P < 0.05: CTO with bypass graft lesions vs. long-duration CTO without bypass graft lesions.
‡P < 0.05: CTO with CABG lesions vs. short-duration CTO without CABG lesions.
§P < 0.05: long-duration CTO without CABG lesions vs. short-duration CTO without CABG lesions.