![]() ![]() As above for MCA PI but with an ideal interrogation angle of 0 degrees.Middle cerebral artery peak systolic velocity If PI >95th percentile, assess umbilical vein for pulsatility.Use colour Doppler to identify the DV at the end of the umbilical vein.Sagittal and transverse approaches are acceptable as long as the Doppler angle is 0–60 degrees.Move anteriorly and angle back to align the MCA flow direction with the Doppler beam.Assess the MCA that is closer to the transducer.Start with the BPD view and move caudally to visualise the butterfly shape of suprasellar cisterns and the sphenoid.Perform assessment during fetal quiescence. ![]() If the PI is abnormal, sample both umbilical arteries and use the more normal (lower) value.If the PI is within normal range, only sample one of the umbilical arteries.See New Zealand Obstetric Doppler Guideline (PDF, 16.2 MB) (NZMFMN 2014b). MCDA twin pregnancy with twin-to-twin transfusion syndrome (TTTS) or selective FGR.Īn abnormal DV PI (± absent or reversed atrial (A) wave) indicates fetal cardiac decompensation.SGA/FGR with normal UA PI after 34 weeks gestation.Ībnormal MCA PI indicates fetal compensation by redistribution of fetal blood flow to the brain (‘brain sparing’) and shows progressive low-resistance flow with increasing diastolic flow.SGA/FGR with abnormal UA PI at any gestation.Middle cerebral artery pulsatility index (MCA PI) EFW on customised chart (eg, GROW) is 95th percentile is abnormal.Umbilical artery pulsatility index (UA PI) ![]()
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