Table 4.
Scan‐Rescan Comparison of 2D Stroke Volume (SV) and Flow Through the Mitral (MV) and Aortic Valve (AV)
| Scan 1 | Scan 2 | Difference (mL)a | Pearson correlation coefficient | Intraclass correlation coefficient | Coefficient of variation (%) | |
|---|---|---|---|---|---|---|
| Mean ± SD (min ‐max) | Mean ± SD (min ‐max) | Mean ± SD (min‐max) | ICC (95% C.I.) | |||
| 2D planimetry | ||||||
| SV (mL) | 103.5 ± 22.8 (77.0‐135) | 104.3 ± 22.1 (74.4‐131.9) | 0.8 ± 7.0 (‐9.2‐12.9) | 0.95b | 0.98 (0.91‐0.99)b | 7 |
| Retrospective valve tracking | ||||||
| MV flow (mL) | 95.4 ± 17.0 (71.4‐121.2) | 97.6 ± 24.0 (62.3‐135.0) | 2.2 ± 11.3 (‐16.7‐17.6) | 0.90b | 0.92 (0.70‐0.98)b | 12 |
| AV flow (mL) | 92.7 ± 15.5 (68.4‐112.9) | 95.3 ± 20.9 (66.0‐95.3) | 2.6 ± 11.7 (‐18.4‐20.7) | 0.83c | 0.89 (0.58‐0.97)c | 12 |
| Backward and forward particle tracing for LV in‐ and outflow | ||||||
| MV flow (Backward only) (mL) | 91.7 ± 23.6 (57.5‐133.1) | 94.1 ± 20.0 (63.3‐121.8) | 2.4 ± 10.7 (‐11.3‐18.2) | 0.89c | 0.94 (0.77‐0.99)b | 11 |
| AV flow (Forward only) (mL) | 91.6 ± 14.0 (71.5‐112.1) | 88.1 ± 13.6 (68.2‐105.2) | ‐3.5 ± 8.2 (‐18.7‐9.5) | 0.83c | 0.90 (0.61‐0.97)c | 9 |
| Multicomponent particle tracing for LV in‐ and outflow | ||||||
| MV flow (Direct flow + retained inflow) (mL) | 82.9 ± 20.1 (56.0‐113.5) | 83.7 ± 19.2 (57.1‐109.6) | 0.8 ± 13.6 (‐12.7‐26.5) | 0.76c | 0.88 (0.48‐0.97)c | 16 |
| AV flow (Direct flow + delayed ejection flow) (mL) | 89.9 ± 13.8 (71.2‐109.5) | 84.1 ± 14.5 (59.2‐103.3) | ‐5.8 ± 10.7 (‐22.7‐13.3) | 0.72c | 0.81 (0.29‐0.95)c | 12 |
a
Differences were calculated with the paired samples t‐test.
b
P < 0.001.
c
P < 0.05.
AV = aortic valve, MV = mitral valve, SV = stroke volume.