Table 5. Univariate and multivariable linear regression analyses of the determinants of pulmonary artery obstruction.
| Parameters | Univariate analysis | Stepwise multivariable analysis | |||
|---|---|---|---|---|---|
| r (95% CI) | P value | β (95% CI) | P value | ||
| RV direct flow (%) | −0.14 (−7.84, 7.57) | 0.971 | – | – | |
| RV retained inflow (%) | −6.17 (−13.56, 1.21) | 0.098 | – | – | |
| RV delayed ejection flow (%) | 3.12 (−4.50, 10.75) | 0.411 | – | – | |
| RV residual volume (%) | 4.07 (−3.50, 11.64) | 0.281 | – | – | |
| Average KEiEDV (µJ/mL) | 12.64 (6.41, 18.86) | <0.001 | – | – | |
| Peak systolic KEiEDV (µJ/mL) | 8.45 (1.37, 15.53) | 0.021 | – | – | |
| Systolic KEiEDV (µJ/mL) | 10.54 (3.83, 17.25) | 0.003 | – | – | |
| Diastolic KEiEDV (µJ/mL) | 10.81 (4.16, 17.47) | 0.002 | 13.54 (7.59, 19.49) | <0.001 | |
| Peak E-wave KEiEDV (µJ/mL) | 10.29 (3.53, 17.05) | 0.004 | 105.26 (47.32, 163.21) | <0.001 | |
| Peak A-wave KEiEDV (µJ/mL) | 9.32 (2.38, 16.26) | 0.010 | –49.36 (–92.58, –6.14) | 0.027 | |
| Average vorticity (1/s) | 3.03 (−4.61, 10.66) | 0.425 | –56.37 (–84.17, –28.57) | <0.001 | |
| Peak systolic vorticity (1/s) | 4.57 (−2.97, 12.10) | 0.226 | |||
| Systolic vorticity (1/s) | 2.28 (−5.39, 9.94) | 0.549 | – | – | |
| Diastolic vorticity (1/s) | 1.80 (−5.88, 9.49) | 0.636 | – | – | |
| Peak E-wave vorticity (1/s) | 1.71 (−5.97, 9.39) | 0.653 | – | – | |
| Peak A-wave vorticity (1/s) | 2.41 (−5.25, 10.07) | 0.527 | – | – | |
CI, confidence interval; RV, right ventricle; KEiEDV, kinetic energy normalized to EDV; Peak systolic KEiEDV, peak KEiEDV of blood flow during systole; Systolic KEiEDV, average KEiEDV of blood flow during systole; Peak E-wave KEiEDV, peak KEiEDV of blood flow during early filling; Peak A-wave KEiEDV, peak KEiEDV of blood flow during late filling; EDV, end-diastolic volume.