Risk factors for late reoperation:
Univariate analysis of risk factors of late re-operation is summarized in table 4. Recipient < 16 years old (p=0.043), initial pulmonary stenosis (p=0.040), concomitant tricuspid surgery during PH implantation (p=0.037) were identified as significant risk factors for re-operation of the RVOT. Isolated PH failure (p=0.223), isolated stenosis of the pulmonary branches during follow-up (p=0.308), ABO-Rhesus compatibility (p=0.167), TOF (p=0.069), size of PH < 22 mm (p=0.205) and concomitant pulmonary arteries enlargement during PH implantation (p=0.361) were not significantly identified as risk factors of late re-operation of the RVOT during follow-up. Multivariate analysis is summarized in table 5. No independent risk factor of late re-operation was significantly identified.