Screening for twin–twin transfusion syndrome at 11–14 weeks of pregnancy: the key role of ductus venosus blood flow assessment
A Matias, N Montenegro, T Loureiro… - … in Obstetrics and …, 2010 - Wiley Online Library
Ultrasound in Obstetrics and Gynecology: The Official Journal of …, 2010•Wiley Online Library
Objectives A discrepancy in crown–rump length (CRL) and/or nuchal translucency thickness
(NT) between monochorionic twins has been found to be associated with an increased risk
of twin–twin transfusion syndrome (TTTS). As one of the most plausible mechanisms for
increased NT is hemodynamic imbalance and cardiac dysfunction, indirectly manifested by
abnormal blood flow in the ductus venosus (DV), we aimed to clarify the role of DV blood
flow assessment in identifying those monochorionic twins more prone to develop TTTS …
(NT) between monochorionic twins has been found to be associated with an increased risk
of twin–twin transfusion syndrome (TTTS). As one of the most plausible mechanisms for
increased NT is hemodynamic imbalance and cardiac dysfunction, indirectly manifested by
abnormal blood flow in the ductus venosus (DV), we aimed to clarify the role of DV blood
flow assessment in identifying those monochorionic twins more prone to develop TTTS …
Objectives
A discrepancy in crown–rump length (CRL) and/or nuchal translucency thickness (NT) between monochorionic twins has been found to be associated with an increased risk of twin–twin transfusion syndrome (TTTS). As one of the most plausible mechanisms for increased NT is hemodynamic imbalance and cardiac dysfunction, indirectly manifested by abnormal blood flow in the ductus venosus (DV), we aimed to clarify the role of DV blood flow assessment in identifying those monochorionic twins more prone to develop TTTS.
Methods
We present 99 cases of monochorionic diamniotic twin pregnancies in which CRL, NT and DV blood flow were evaluated at 11–14 weeks' gestation.
Results
Discrepant values of CRL were not predictive of TTTS development. Intertwin NT discrepancy ≥ 0.6 mm had a sensitivity of 50.0% and a specificity of 92.0%. The presence of at least one abnormal blood flow waveform in the DV was associated with a relative risk for developing TTTS of 11.86 (95% CI, 3.05–57.45), with a sensitivity of 75.0% and a specificity of 92.0%. The combination of abnormal DV blood flow with NT discrepancy ≥ 0.6 mm yielded a relative risk for the development of TTTS of 21 (95% CI, 5.47–98.33).
Conclusions
Both intertwin discrepancy in NT and abnormal flow in the DV in monochorionic twins may represent early manifestations of hemodynamic imbalance between donor and recipient. In these pregnancies, in addition to NT measurement at 11–14 weeks, the Doppler assessment of DV blood flow significantly increases the performance of screening for those at risk of developing TTTS. Copyright © 2010 ISUOG. Published by John Wiley & Sons, Ltd.
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