Comparison of middle cerebral artery Doppler velocimetry in appropriate for gestational age and severely growth restricted fetuses

MCA flow velocity waveforms in (A) an AGA fetus and (B) severe FGR. Note the high diastolic flow in panel (B) (brain sparing effect) and high peak systolic velocity (v). The pulsatility index in (A) was 2.4 versus 0.97 in (B).