Table 2. Proportion of subvalvular procedures stratified by institutional total case numbers.
| Surgical procedures | Case number (%)* | P-value | |
|---|---|---|---|
| Institutional case volume | <10 | ≥10 | |
| Overall | 742 | 1557 | |
| MVR | 286 (38.5) | 600 (38.5) | |
| + CCP | 192 (67.1) | 251 (41.8) | <0.001 |
| + PMA | 10 (3.5) | 7 (1.2) | 0.04 |
| MVP | 456 (61.5) | 957 (61.5) | |
| + PMA | 55 (12.1) | 54 (5.6) | <0.001 |
| + PMR | 66 (14.5) | 88 (9.2) | 0.004 |
*MVR, MVP; % indicates ratio among overall mitral valve surgeries. + CCP, + PMA, + PMR; % indicates ratio among MVR or MVP. CCP: complete chordal preservation; MVP: mitral valvuloplasty; MVR: mitral valve replacement; PMA: papillary muscle approximation; PMR: papillary muscle relocation