Objective: To determine the effect of arterio-arterial anastomosis on the umbilical arterial flow in mono-chorionic, di-amniotic twin pregnancy.
Subjects: Thirty-three women with mono-chorionic, di-amniotic twin pregnancy.
Methods: Pulsed Doppler ultrasonographic examination was performed every 4 weeks to obtain umbilical arterial flow velocity waveforms in both two fetuses.
Results: In five of the women, cyclic flow changes in the umbilical arterial flow were detected in the smaller fetus. All of these twins had arterio-arterial anastomosis on the surface of the placenta.
Conclusion: The fetuses in mono-chorionic and di-amniotic twin gestation who showed cyclic changes in umbilical arterial flow had arterio-arterial anastomosis. But, this characteristic flow was not observed every time.
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