Study limitation
The study was limited in that it was relatively small research and did
not recruit CHD fetuses. We expect to carry out a multi-center study in
a normal screening population to evaluate the sensitivity and
specificity of this detailed scanning procedure in cardiac screening.
Besides, to our acknowledgment, the study about the R-flow on fetal
echocardiography is rare. We expect the advanced application of R-flow
on the prenatal diagnosis of the fetal heart.