Table 3.
Comparison of IVUS vs CCTA:Separately 64-slice vs 256-slice (continuous variables)
| Metric | IVUS (n=686) | CCTA (n=686) | Correlation Coefficient (P-value*) | P value of the correlation coefficient 64-slice vs. 256 slices** |
|---|---|---|---|---|
| Vessel area (mm2) | ||||
| 256-slice CCTA (n=334) | 13.1±4.2 | 11.1±4.5 | 0.60 (p<0.0001) | P=0.40 |
| 64-slice CCTA (n=352) | 12.4±4.5 | 10.3±4.5 | 0.64 (p<0.0001) | |
| Lumen area (mm2) | ||||
| 256-slice CCTA (n=334) | 6.8±2.7 | 5.6±2.7 | 0.41 (p<0.0001) | P=0.52 |
| 64-slice CCTA (n=352) | 6.7±2.8 | 5.0±2.4 | 0.45 (p=0.002) | |
| Plaque area (mm2) | ||||
| 256-slice CCTA (n=334) | 6.1±2.9 | 4.9± 3.1 | 0.67 (p<0.0001) | P=0.81 |
| 64-slice CCTA (n=352) | 5.8±2.9 | 5.3±3.3 | 0.68 (p<0.0001) | |
| MLA per artery (mm2) | ||||
| 256-slice CCTA (n=334) | 5.0±2.0 | 4.1±1.3 | 0.61(p<0.0001) | P=0.0004 |
| 64-slice CCTA (n=352) | 4.0±1.2 | 3.0±1.4 | 0.41(p=0.24) | |
| Average ESS (Pa) | ||||
| 256-slice CCTA (n=334) | 2.6±1.4 | 2.9 ±2.1 | 0.41 (p<0.0001) | P=0.23 |
| 64-slice CCTA (n=352) | 2.7±1.7 | 3.3±3.7 | 0.33 (p=0.017) | |
| Plaque 90° arc MIN ESS (Pa) | ||||
| 256- slice CCTA (n=334) | 1.9± 1.4 | 2.1±1.8 | 0.32 (p<0.0001) | P=0.48 |
| 64-slice CCTA (n=352) | 2.0±1.5 | 2.8±3.2 | 0.27 (p<0.008) | |
| Plaque 90° arc MAX ESS (Pa) | ||||
| 256-slice CCTA (n=334 | 3.3 ±1.6 | 3.8±2.5 | 0.49 (p<0.0001) | P=0.19 |
| 64-slice CCTA (n=352) | 3.4 ±1.7 | 4.6±4.4 | 0.41 (p=0.007) | |
Values are presented as mean± SD for continuous variables, n= number of analyzed segments, CCTA= coronary computed tomography angiography, IVUS=intravascular ultrasound, Min ESS= minimal endothelial shear stress, Max ESS= maximal endothelial shear stress, Average ESS=average endothelial shear stress
*
Correlation coefficient is different from r=0.25
**
Comparison of 2 correlation coefficients