Table 4. Comparison of the 4D flow parameters between supravalvular pulmonary stenosis and non-supravalvular pulmonary stenosis in D-TGA.
| Parameters | Supravalvular pulmonary stenosis (n=16) | Non-supravalvular pulmonary stenosis (n=18) | P |
|---|---|---|---|
| Direct flow (%) | 35.5 [26.1, 37.4] | 34.8 [30.8, 38.2] | 0.739 |
| Retained inflow (%) | 20.2 [14.8, 24.7] | 20.7 [15.3, 24.0] | 0.780 |
| Delayed ejection flow (%) | 15.0 [10.3, 23.0] | 15.7 [12.9, 17.1] | 0.901 |
| Residual volume (%) | 29.0 [23.0, 35.5] | 28.6 [26.6, 33.6] | 0.939 |
| Average KEiEDV (µJ/mL) | 7.42 [6.1, 9.8] | 6.65 [5.6, 7.9] | 0.125 |
| Peak systolic KEiEDV (µJ/mL) | 17.1 [12.5, 20.6] | 13.1 [9.4, 15.6] | 0.093 |
| Systolic KEiEDV (µJ/mL) | 7.5 [5.2, 10.9] | 6.7 [4.9, 7.3] | 0.116 |
| Diastolic KEiEDV (µJ/mL) | 8.7 [6.3, 10.0] | 7.0 [5.9, 8.7] | 0.175 |
| Peak E-wave KEiEDV (µJ/mL) | 9.0 [6.5, 10.7] | 6.8 [6.2, 8.9] | 0.042 |
| Peak A-wave KEiEDV (µJ/mL) | 8.1 [4.2, 9.1] | 6.6 [4.9, 7.7] | 0.235 |
| Average vorticity (1/s) | 489.3 [401.8, 705.1] | 391.3 [326.7, 557.2] | 0.018 |
| Peak systolic vorticity (1/s) | 593.1 [498.9, 803.1] | 509.2 [413.1, 662.9] | 0.027 |
| Systolic vorticity (1/s) | 499.7 [377.1, 671.4] | 396.5 [304.3, 586.6] | 0.032 |
| Diastolic vorticity (1/s) | 481.2 [417.4, 624.1] | 433.3 [331.9, 530.6] | 0.636 |
| Peak E-wave vorticity (1/s) | 482.7 [421.7, 623.8] | 455.9 [344.3, 522.0] | 0.243 |
| Peak A-wave vorticity (1/s) | 478.7 [402.7, 629.3] | 394.9 [318.6, 570.7] | 0.282 |
The data are presented as the median [IQR]. IQR = [25th percentile, 75th percentile]. 4D, four dimensional; D-TGA, dextro-transposition of the great arteries; 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; IQR, interquartile range.