Table 4.
MRI-derived LA volumetric and functional measurements.
| Control (n = 51) | Mitral regurgitation |
||
|---|---|---|---|
| Pre-operative (n = 35) | Post-operative (n = 35) | ||
| LAVmin index (ml/m2) | 14 ± 4 | 34 ± 19* | 23 ± 8*, † |
| LAVmax index (ml/m2) | 31 ± 8 | 61 ± 23* | 40 ± 11‡, † |
| LAVactive index (ml/m2) | 21 ± 6 | 44 ± 19* | 32 ± 9*, † |
| LAEF | 0.54 ± 0.08 | 0.45 ± 0.11‡ | 0.42 ± 0.10* |
| LAEFactive | 0.31 ± 0.10 | 0.23 ± 0.11* | 0.28 ± 0.08 |
| LAEFpassive | 0.32 ± 0.12 | 0.30 ± 0.09 | 0.20 ± 0.09*, † |
| LA Peak Filling Rate (LAVmax/s) | 2.54 ± 0.69 | 2.67 ± 0.70 | 1.99 ± 0.62 |
| LA Peak E. Dia. Ejection Rate (LAVmax/s) | 3.11 ± 0.99 | 2.67 ± 0.88 | 1.80 ± 0.58*, † |
| Time to LAVmax (ms) | 382 ± 53 | 354 ± 58‡ | 395 ± 46† |
Values are in mean ± SD.
LA, left atrium; LAVmax index, LA maximum volume at end-systole/body surface area; LAVmin index, LA minimum volume at end-diastole; LAVactive index, LA volume at atrial active kick; LAEF, LA ejection fraction; E. Dia., early diastole.
*P < 0.01 vs. Control.
†P < 0.01 vs. Pre-operative MR.
‡P < 0.05 vs. Control.
§P < 0.05 vs. Pre-operative MR.
Age and gender effect are adjusted.