Notching of the umbilical artery waveform associated with cord entanglement in a monoamniotic twin pregnancy

Abstract

Cord accidents are the principal cause of the high rates of morbidity and mortality associated with monoamniotic twins. Observation of an umbilical artery notch might be a highly specific sign for cord entanglement involving a tight cord knot. It thus justifies the implementation of intense surveillance and should be one of the factors taken into account in deciding on early delivery of the twins.

• Cord accidents
• delivery
• Doppler anomaly
• true knot of the umbilical cord
• umbilical notch