Table 7. Univariable and multivariable risk factors for MV reoperation.
| Variables | Univariable analysis | Multivariable analysis | |||||
|---|---|---|---|---|---|---|---|
| HR | 95% CI | P value | HR | 95% CI | P value | ||
| Age | 1.005 | 0.990–1.021 | 0.498 | – | – | – | |
| Age ≤6 months | 0.389 | 0.048–3.140 | 0.375 | – | – | – | |
| Weight | 1.004 | 0.936–1.077 | 0.915 | – | – | – | |
| Weight ≤8 kg | 0.640 | 0.133–3.090 | 0.579 | – | – | – | |
| Gender (male =0) | 1.520 | 0.385–6.001 | 0.550 | – | – | – | |
| LVEF <0.6 before surgery | 1.084 | 0.286–4.110 | 0.906 | – | – | – | |
| Annular diameter/BSA before surgery | 1.012 | 0.978–1.048 | 0.482 | – | – | – | |
| LAD/BSA before surgery | 1.001 | 0.978–1.024 | 0.949 | – | – | – | |
| LVEDD/BSA before surgery | 1.004 | 0.982–1.026 | 0.721 | – | – | – | |
| LVSDD/BSA before surgery | 1.009 | 0.974–1.045 | 0.612 | – | – | – | |
| LVEDVI before surgery | 1.006 | 0.998–1.015 | 0.122 | – | – | – | |
| LVESVI before surgery | 1.020 | 1.002–1.038 | 0.027 | 1.016 | 0.994–1.038 | 0.167 | |
| Double-orifice MV technique | 8.728 | 1.046–72.856 | 0.045 | 8.906 | 0.946–83.822 | 0.056 | |
| Concomitant procedure | 0.558 | 0.147–2.122 | 0.392 | – | – | – | |
| Without annuloplasty | 0.533 | 0.139–2.038 | 0.358 | – | – | – | |
| Mixed mitral valve pathology | 2.179 | 0.579–8.194 | 0.249 | – | – | – | |
| Isolated MR diseases | 1.554 | 0.383–6.300 | 0.537 | – | – | – | |
| MR combined with CHD diseases | 0.836 | 0.223–3.134 | 0.790 | – | – | – | |
| MS diseases | 0.776 | 0.154–3.894 | 0.758 | – | – | – | |
| ≥ moderate MV regurgitation before surgery | 1.224 | 0.242–6.184 | 0.807 | – | – | – | |
| ≥ moderate MV regurgitation at first 24 h after first surgery | 11.874 | 2.266–62.208 | 0.003 | 8.493 | 1.532–47.079 | 0.014 | |
| ≥ moderate MV stenosis before surgery | 1.270 | 0.307–5.245 | 0.741 | – | – | – | |
| ≥ moderate MV stenosis at first 24 h after first surgery | 4.571 | 0.552–37.888 | 0.159 | – | – | – | |
| Surgical era (2013 to 2016) | 0.453 | 0.087–2.355 | 0.346 | – | – | – | |
MV, mitral valve; 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; MR, mitral valve regurgitation; CHD, congenital heart diseases; MS, mitral valve stenosis.