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Discordance in Nuchal Translucency Measurements in Monochorionic Diamniotic Twins as Predictor of Twin-to-Twin Transfusion Syndrome

  • Ingeborg H. Linskens (a1), Yolanda M. de Mooij (a2), Jos W. Twisk (a3), Willem J. Kist (a4), Dick Oepkes (a5) and John M. van Vugt (a6)...

Abstract

Objective: Discordance in nuchal translucency measurements in monochorionic diamniotic twin pregnancies was assessed as predictor of Twin-to-Twin Transfusion Syndrome. Study Design: A total of 61 monochorionic diamniotic twins were enrolled. Nuchal translucency (NT) and crown-rump-length (CRL) discordance was calculated as the percentage of delta NT and CRL (absolute difference NT/CRL fetus 1 and fetus 2) of the largest measurement, and correlated with subsequent development of Twin-to-Twin Transfusion Syndrome. Results: Twin-to-Twin Transfusion Syndrome developed in 14/61 (23%) of cases. A NT discordance of 20% or more best predicted Twin-to-Twin Transfusion Syndrome development, with a sensitivity of 64% and a specificity of 78%. We found a positive predictive value of 50% and negative predicted value of 86% for Twin-to-Twin Transfusion Syndrome development if NT discordance was 20% or more. Conclusion: NT discordance of more than 20% in monochorionic diamniotic twins is associated with an increased risk for subsequent development of Twin-to-Twin Transfusion Syndrome, and with earlier presentation of symptoms.

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Corresponding author

*Address for correspondence: Ingeborg H. Linskens, VU University Medical Center, Department OBS/GYN, Suite PK 6 Z 170, P.O. Box 7057, 1007 MB Amsterdam, the Netherlands.

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