Bleeding and fetal Doppler parameter.

The report on “bleeding and fetal Doppler parameter” is very interesting (1). Iskender et al. reported that “bleeding during genetic amniocentesis did not change umbilical artery and middle cerebral artery Doppler parameters (1).” The finding might not applicable to all cases. In cases with pathology, an aberration might be possible. For example, in the case with intrauterine growth restriction (IUGR), of which the parameter is usually abnormal (2, 3), the effect should be specifically studied. A similar consideration for the case with polyhydramnios (4) should be mentioned as well.