Lesion assessment based on OCT measurements after stent/scaffold implantation and after postdilatation
| OCT-based measurement | NCB cohort (n=45) | SCB cohort (n=49) | P value |
| After stent implantation | |||
| Distal reference luminal area (mm) | 6.21±2.47 | 6.43±1.97 | 0.67 |
| Proximal reference luminal area (mm2) | 8.07±2.77 | 8.04±2.05 | 0.97 |
| Mean stent area (mm2) | 6.66±1.88 | 6.73±1.74 | 0.74 |
| In-stent minimal luminal diameter (mm) | 2.47±0.40 | 2.37±0.32 | 0.03 |
| Stent expansion index* | 0.88±0.13 | 0.85±0.14 | 0.19 |
| Stent expansion index <0.8 | 27 % | 42 % | 0.14 |
| After postdilatation | |||
| Average stent area (mm2) | 7.35±2.15 | 7.38±1.93 | 0.99 |
| In-stent minimal luminal diameter (mm) | 2.57±0.42 | 2.47±0.33 | 0.08 |
| Stent expansion index | 0.94±0.13 | 0.88±0.13 | 0.02 |
| Stent expansion index <0.8 | 15 % | 25 % | 0.18 |
*The stent expansion index calculation bases on OCT measurements and is defined as the minimum stent/scaffold area divided by average reference lumen area (distal reference area+proximal reference area/2).
NCB, non-compliant balloon; OCT, optical coherence tomography; SCB, semi-compliant balloon.