Cerebroplacental ratio in fetal surveillance: an alert bell or a crash sound?

TO THE EDITORS: DeVore 1 raises the prospect of an important role for cerebroplacental ratio in fetal surveillance. This Doppler parameter was introduced more than 20 years ago and has once again come to prominence. It has been thought to reflect fetal adaptation to progressive placental chronic hypoxia more sensitively than the umbilical artery and middle cerebral artery pulsatility indices on their own by showing earlier changes and unveiling hitherto unrecognized fetal compromise. Further, as summarized by DeVore, 1 a role