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[Rate of prenatal detection of congenital right heart defects].
Zeitschrift Für Geburtshilfe und Neonatologie 1999 September
Congenital right heart lesions (including tetralogy of Fallot, pulmonary valve stenosis, pulmonary atresia with intact ventricular septum, Ebstein's anomaly and dysplastic tricuspid valve) account for about 19% of congenital cardiac anomalies. We performed a retrospective study in order to assess the percentage of patients with significant right heart lesions (requiring therapy in the first year of life), which is detected prenatally and referred to a centre for perinatal treatment. From 1/1990 until 12/1997 congenital right heart lesions were diagnosed in 21 fetuses and 190 infants (211 patients. The majority of patients had tetralogy of Fallot (64%), less frequently we found critical pulmonary valve stenosis (9%), pulmonary atresia with intact ventricular septum (9%), tricuspid atresia (14%) and Ebstein's anomaly or dysplastic tricuspid valve (4%). Prenatally the cardiac anomaly was diagnosed in all 21 cases who were referred to our center (10%). The highest referral and detection rate was found among fetuses with Ebstein's anomaly or dysplastic tricuspid valve (5/8 patients = 63%) followed by fetuses with pulmonary atresia and intact ventricular septum (5/20 = 25%), critical pulmonary stenosis (4/18 = 22%) or tricuspid atresia (4/29 = 14%). The prenatal referral rate was disappointing in children with tetralogy of Fallot (3/136 = 2.2%). A higher prenatal detection rate of congenital right heart lesions can be achieved only by an improvement of prenatal screening including the 4-chamber view and the origin of the great arteries. A first step would be the inclusion of the fetal 4-chamber view into the routine examination during the 18th-20th week of pregnancy (stage 1 of a multistage concept of prenatal screening) and by assessment of the outflow tracts and the great arteries in pregnancies associated with risk factors or anomalies of the fetus (stage 2 and 3 of a multistage concept).
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