Artery-to-artery anastomosis in monochorionic twins.
We describe Doppler signals in artery-to-artery anastomoses of two monochorionic twin pregnancies. Flow velocity waveforms demonstrated cyclic changes in systolic velocities with intermittent reversal of end-diastolic velocities. A computer model showed that this was the result of two opposing pulsatile blood flow waveforms with different velocities and frequencies.
Hecher
K
K
Department of Obstetrics and Gynecology, King's College School of Medicine and Dentistry, London, United Kingdom.
Jauniaux
E
E
Campbell
S
S
Deane
C
C
Nicolaides
K
K
D001159:Arterio-Arterial Fistula / Q000000981:diagnostic imaging*; D001783:Blood Flow Velocity; D005260:Female; D005330:Fetofetal Transfusion / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D014430:Twins, Monozygotic; D016216:Ultrasonography, Prenatal; D014469:Umbilical Arteries / Q000002:abnormalities* / Q000000981:diagnostic imaging