Table 8. Univariable and multivariable risk factors for death.
| Variables | Univariable analysis | Multivariable analysis | |||||
|---|---|---|---|---|---|---|---|
| HR | 95% CI | P value | HR | 95% CI | P value | ||
| Age | 0.974 | 0.930–1.019 | 0.254 | – | – | – | |
| Age ≤6 months | 2.264 | 0.372–13.779 | 0.375 | – | – | – | |
| Weight | 0.906 | 0.548–1.496 | 0.699 | – | – | – | |
| Weight ≤8 kg | 1.495 | 0.250–8.963 | 0.660 | – | – | – | |
| Gender (male =0) | 0.705 | 0.116–4.296 | 0.704 | – | – | – | |
| LVEF <0.6 before surgery | 0.846 | 0.140–5.112 | 0.855 | – | – | – | |
| Annular diameter/BSA before surgery | 1.018 | 0.975–1.063 | 0.422 | – | – | – | |
| LAD/BSA before surgery | 1.017 | 0.993–1.041 | 0.168 | – | – | – | |
| LVEDD/BSA before surgery | 0.997 | 0.966–1.029 | 0.872 | – | – | – | |
| LVSDD/BSA before surgery | 0.992 | 0.941–1.045 | 0.765 | – | – | – | |
| LVEDVI before surgery | 0.999 | 0.986–1.013 | 0.895 | – | – | – | |
| LVESVI before surgery | 1.010 | 0.985–1.036 | 0.441 | – | – | – | |
| Double-orifice MV technique | 43.047 | 5.843–317.13 | 0.00002 | 39.319 | 3.653–423.213 | 0.002 | |
| Concomitant procedure | 1.826 | 0.202–16.530 | 0.592 | – | – | – | |
| Without annuloplasty | 54.722 | 0.031–96818.99 | 0.294 | – | – | – | |
| Mixed mitral valve pathology | 2.469 | 0.406–15.006 | 0.326 | – | – | – | |
| Isolated MR diseases | 0.032 | 0.000005–219.308 | 0.444 | – | – | – | |
| MR combined with CHD diseases | 1.397 | 0.233–8.386 | 0.714 | – | – | – | |
| MS diseases | 2.110 | 0.341–13.073 | 0.422 | – | – | – | |
| MV reoperation | 13.181 | 2.191–79.293 | 0.005 | 8.764 | 1.354–56.751 | 0.023 | |
| Severe MV regurgitation before surgery | 2.120 | 0.345–13.032 | 0.417 | – | – | – | |
| Severe MV regurgitation at first 24 h after first surgery | 14.422 | 2.026–102.653 | 0.008 | 10.856 | 1.285–91.682 | 0.028 | |
| Surgical era (2013 to 2016) | 1.284 | 0.181–9.119 | 0.803 | – | – | – | |
HR, hazard ratio; CI, confidence interval; LVEF, left ventricular ejection fraction; BSA, body surface area; LAD, left atrium diameter; LVEDD, left ventricular end-diastolic diameter; LVSDD, left ventricular end-systolic diameter; LVEDVI (LVEDV/BSA), left ventricular end-diastolic volume index; LVESVI (LVESV/BSA), left ventricular end-systolic volume index; MV, mitral valve; MR, mitral valve regurgitation; CHD, congenital heart diseases; MS, mitral valve stenosis.