P31.13: Tricuspid regurgitation as a first trimester marker of chromosomal anomalies

Abstract

Poster abstracts trisomy 21. In the remaining three cases with outcomes of trisomy 21, the diagnosis of trisomy 21 was not made in the first trimester although sonographic findings on the second-trimester ultrasound led to the prenatal diagnosis in two of the cases (atrioventricular canal in one and flat face with hypoplastic NB in the other). Conclusion: NB assessment can increase the detection rate of trisomy 21 by detecting the subset of trisomy 21 fetuses presenting with normal NT. Teaching and training in ultrasound assessment of the NB is important for establishing the real value of this ultrasound marker in the population of trisomy 21 fetuses with normal nuchal translucency thickness.