33 測量子宮內生長遲緩（intrauterine growth restriction）胎兒的臍帶動脈之杜卜勒血流時，出現下列何
種波形，表示胎兒血液循環有嚴重障礙，通常要儘快生產？
Reversed end-diastolic flow S/D ratio＜3.0
S/D ratio＜2.0 S/D ratio＜1.0
A
REVERSE ED FLOW IS THE MOST SEVERE ONE!
Absent or reversed end-diastolic flow velocity (AEDFV) waveforms in the umbilical arteries of growth-restricted fetuses have been presented by many investigators as a sign of poor fetal outcome
Systolic/diastolic (S/D) ratio : CORD TORSION!!!!
Excessive torsion of cord diagnosed by ultrasound and in postnatal anatomy had the same rate of 91%. With lower pitch values (<2.0)>3.0), the possibility of fetal distress was increased, the neonatal Apgar score was decreased and umbilical blood pH values <>
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