Table 2.
Results From Linear Regression Analysis
| Flow Through AA Compared to PT | ||||||||
|---|---|---|---|---|---|---|---|---|
| y | X | Aortic Flow (ml) | Pulmonary Flow (ml) | Intercept (ml) | Slope | P value | R2 | N |
| Spiral AA | Spiral PT | 88 ± 20 | 82 ± 18 | 3.56 | 1.03 | 0.0001 | 0.88 | 10 |
| Cartesian AA | Cartesian PT | 96 ± 17 | 90 ± 16 | 24.55 | 0.79 | 0.0610 | 0.54 | 7 |
| Pathline Analysis: LV Inflow Compared to LV Outflow | ||||||||
|---|---|---|---|---|---|---|---|---|
| y | X | Inflow (ml) | Outflow (ml) | Intercept (ml) | Slope | P value | R2 | N |
| Spiral in | Spiral out | 83 ± 23 | 84 ± 21 | −2.41 | 1.02 | 0.0000 | 0.90 | 10 |
| Cartesian in | Cartesian out | 84 ± 17 | 83 ± 15 | −6.48 | 1.10 | 0.0004 | 0.93 | 7 |
| Spiral Compared to Cartesian: Net Volume Flow | ||||||||
|---|---|---|---|---|---|---|---|---|
| y | X | Spiral (ml) | Cartesian (ml) | Intercept (ml) | Slope | P value | R2 | N |
| Spiral AA & PT | Cartesian AA & PT | 91 ± 16 | 93 ± 16 | 17.63 | 0.79 | 0.0003 | 0.68 | 7 + 7 |
| Spiral in & out | Cartesian in & out | 88 ± 16 | 84 ± 15 | 14.90 | 0.87 | 0.0001 | 0.72 | 7 + 7 |
| Peak Flow Rate | ||||||||
|---|---|---|---|---|---|---|---|---|
| y | X | Spiral (ml/s) | Cartesian (ml/s) | Intercept (ml/s) | Slope | P value | R2 | N |
| Spiral AA & PT | Cartesian AA & PT | 432 ± 101 | 426 ± 89 | 21.73 | 0.96 | 0.0001 | 0.72 | 7 + 7 |
| Peak Velocity | ||||||||
|---|---|---|---|---|---|---|---|---|
| y | X | Spiral (m/s) | Cartesian (m/s) | Intercept (m/s) | Slope | P value | R2 | N |
| Spiral AA & PT | Cartesian AA & PT | 1.14 ± 0.32 | 1.16 ± 0.29 | −0.02 | 1.00 | 0.0000 | 0.81 | 7 + 7 |
| Flow Components From Pathline Analysis* | ||||||||
|---|---|---|---|---|---|---|---|---|
| y | X | Spiral (ml) | Cartesian (ml) | Intercept (ml) | Slope | P value | R2 | |
| Spiral | Cartesian | 36 ± 19 | 34 ± 17 | 0.28 | 1.04 | 0.0000 | 0.87 | 7·4 |
Linear regression model was y = intercept + slope ·X. If P value of slope, P, is < 0.05, a significant linear relationship between y and X was found. N = 7 for normal and N=10 if including patients (only spiral data). All net volume flow values are represented as mean ± one SD. *Regression analysis of flow components included all four flow components (direct, retained, delayed, and residual) in one regression. Mean flow is mean of all components.
AA, ascending aorta; LV, left ventricle; PT, pulmonary trunk; SD, standard deviation.