Table 4.
Correlations (r) and significance (p) between the three gradients and each artery with respect to heart rate (HR) and body-mass index (BMI) in 36 patients with no CT evidence of CAD. Significant correlations (p<0.05) are highlighted. The gradient change reflects the expected influence on the gradient magnitude of heart rate (55-65 bpm) and BMI (20-30 kg/m2) variations observed for coronary CTA patients, i.e., Gradient change = regression coefficient × 10 [bpm, or, kg/m2].
| Correlations for Distance Gradient | ||||||
|---|---|---|---|---|---|---|
| RCA | LAD | LCx | ||||
| r | Gradient change [HU/cm] |
r | Gradient change [HU/cm] |
r | Gradient change [HU/cm] |
|
| HR | 0.07 | 0.46 | 0.26 | 3.45 | 0.46 | 5.91 |
| BMI | 0.33 | 2.41 | 0.33 | 4.82 | 0.29 | 3.98 |
| Correlations for Short Axis Diameter Gradient | ||||||
|---|---|---|---|---|---|---|
| RCA | LAD | LCx | ||||
| r | Gradient change [HU/mm] |
r | Gradient change [HU/mm] |
r | Gradient change [HU/mm] |
|
| HR | -0.22 | -7.51 | -0.35 | -11.86 | -0.40 | -13.89 |
| BMI | -0.45 | -16.35 | -0.45 | -16.68 | -0.47 | -17.73 |
| Correlations for Cross-Sectional Area Gradient | ||||||
|---|---|---|---|---|---|---|
| RCA | LAD | LCx | ||||
| r | Gradient change [HU/mm2] |
r | Gradient change [HU/mm2] |
r | Gradient change [HU/mm2] |
|
| HR | -0.28 | -2.19 | -0.41 | -3.48 | -0.43 | -4.38 |
| BMI | -0.39 | -3.37 | -0.38 | -3.51 | -0.37 | -4.04 |