Fetal middle cerebral arterial Doppler assessment …
US Doppler Indices in Umbilical and Fetal MCA in Diagnosis …
fetal MCA peak systolic velocity (PSV) : the highest velocity should be recorded. fetal MCA systolic/diastolic (S/D) ratio : a normal fetal MCA S/D ratio should always be higher than the umbilical arterial S/D ratio. cerebroplacental ratio (CPR): ratio of.
The 61 fetuses underwent Doppler sonography in the third trimester and then were stratified into 3 groups based on the MCA/UA S/D ratio: group A, MCA/UA S/D ratio > 1.0 (controls n = 37) group B, MCA/UA S/D ratio < or = 1.0 (intracerebral blood flow redistribution n = 16) and group C, reversed or absent UA diastolic flow (n = 8).The Doppler indices have been found to decline gradually with gestational age (i.e. there is more diastolic flow as the fetus matures): S/ D ratio mean value decreases with fetal age 8. at 20 weeks, the 50 th percentile for the S/D ratio is 4 at 30 weeks, the 50 th percentile is 2.83 at 40 weeks, the 50 th percentile is 2.18, The fetal middle cerebral artery Doppler is used to demonstrate fetal cerebral blood flow due to its easy accessibility and high reproducibility. During normal pregnancy, the MCA shows high resistance and low diastolic flow pattern with continuous forward flow throughout the cardiac cycle. It has high PI index. The Middle cerebral artery S/D ratio is always higher than Umbilical
