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ABSTRACT: Background: The aim of this retrospective study was to evaluate the influence of prenatal diagnosis on perinatal outcomes of congenital heart disease (CHD) over a 17 year period at a single center. Methods: The perinatal outcome of CHD in 146 patients diagnosed on fetal echocardiography between 1994 and 2010 were reviewed. The characteristics of 193 neonatal inpatients with CHD treated at the authors' department between 2001 and 2010 were also analyzed; among the inpatients, 61 were diagnosed before birth (prenatal group) and 132 were diagnosed after birth (postnatal group). Results: Among the 146 patients prenatally diagnosed with CHD, the prenatal mortality, including abortion and stillbirth, decreased from 1994 to 2010. Among the 193 neonatal inpatients, the prenatal group had lower gestational age and bodyweight than the postnatal group. Further, the prenatal group had lower blood pH at admission, but no patient in that group experienced ductal shock, although six patients in the postnatal group did. The average dose of prostaglandin E1 used in duct-dependent CHD was significantly lower in the prenatal group than in the postnatal group (3.4 vs. 4.6 ng/kg per min; P = 0.015). Conclusions: Prenatal diagnosis of CHD enables planned labor, prevents ductal shock, and reduces prostaglandin E1 side-effects and medical expenditure.