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Fetal Aneuploidy Screening Mastery

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The Tricuspid Valve (TV) Evaluation

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1. Doppler gate should be used when assessing the tricuspid valve in the first trimester?
1 mm 3 mm 5 mm 10 mm
2. When assessing tricuspid regurgitation with Doppler, the flow angle should be:
45° or less 90° As near to zero as feasible Any angle is acceptable
3. For tricuspid regurgitation to be classified as "significant," its duration must be:
Any detectable regurgitation Less than half of systole More than half of systole Equal to diastole
4. What minimum velocity defines a significant tricuspid regurgitant jet in the first trimester?
30 cm/sec 45 cm/sec 60 cm/sec 80 cm/sec
5. What percentage of chromosomally NORMAL fetuses show significant tricuspid regurgitation?
1% 4% 10% 15%
6. In Down syndrome (Trisomy 21), what percentage of fetuses show significant TR in the first trimester?
33% 45% 55% 68%
7. What percentage of Trisomy 18 fetuses show significant tricuspid regurgitation?
15% 33% 50% 68%
8. In the first-trimester screening pathway, TR assessment is best described as:
A primary standalone screening test A secondary test after high-risk NT & serum results A replacement for NT measurement Only used in the second trimester
9. When TR is added as a second screening test for Down syndrome, what false-positive rate is achieved?
1.0% 2.7% 5.0% 8.5%
10. With TR as a second screening test, what is the reported detection rate for Down syndrome?
75% 82% 92% 98%