(A) Type 1 sFGR. Persistently forward umbilical artery end-diastolic flow without variation in the waveform and normal or elevated resistance. (B) Type 2 sFGR. Fixed absent or fixed reversed umbilical artery end-diastolic flow without variation of the waveform in the smaller twin. (C) Type 3 sFGR. Variable umbilical artery flow pattern that cycles between forward, absent, and reversed flow over a short interval.
sFGR: selective fetal growth restriction.
Courtesy of Jena Miller, MD.
Graphic 122609 Version 2.0
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