Our purpose was to evaluate the efficacy of level two ultrasound scree
ning for the detection of congenital heart defects (CHD) in a low-risk
population by using three standardized cuts. Within a period of four
years a total of 6727 pregnant women of a low-risk population undertoo
k several ultrasound examinations on the basis of screening for fetal
malformations. All ulstrasound examinations were performed by three ex
perienced doctors. At every single scan three standardized cuts (apica
l and lateral four-chamber view, crossing over of the great arteries)
were obtained in order to detect congenital heart defects. Of 87 CHDs
(1.33 per cent of the examined women) 39 (43.8 per cent) were diagnose
d prenatally. The detection rate was 10/48 (20.8 per cent) in the pres
ence of VSD, ASD2 or combined ASD2 + VSD, the detection rate was 29139
(74.3 per cent) in the presence of other forms of congenital heart di
sease. None of the 38 missed cases in the first group but three of the
ten missed CHDs in the second group had emergency neonatological prob
lems. Aneuploidy and/or other malformations existed in 22/87 cases of
CHD. The obstetrical management was changed in nearly all cases after
the diagnosis of a CHD. Twenty-two women opted for termination of preg
nancy because of additional fetal malformations or chromosomal defects
. Five women were transferred prenatally to a tertiary centre for neon
atal cardiac surgery. Ten deliveries were performed in the presence of
a neonatologist. Good detection rates for CHD can be achieved in a lo
w-risk population on the basis of level two ultrasound screening by us
ing the above mentioned three cuts and thus, the perinatal mortality a
nd morbidity can be improved. (C) 1998 John Wiley & Sons, Ltd.