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Increased nuchal translucency with normal karyotype
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DOI：10.1016/j.ajog.2004.12.093.png)
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Abstract
En 中文
Increased fetal nuchal translucency (NT) thickness between 11 and 14 weeks' gestation is a common phenotypic expression of chromosomal abnormalities, including trisomy 21. However, even in the absence of aneuploidy, nuchal thickening is clinically relevant because it is associated with an increase in adverse perinatal Outcome caused by a variety of fetal malformations, dysplasias, deformations, dysruptions, and genetic syndromes. Once the presence of aneuploidy is ruled Out, the risk of perinatal Outcome close not statistically increase until the nuchal translucency measurement reaches 3.5 min or more (> 99th percentile). This increase in risk Occurs in an exponential fashion as the NT measurement increases. However, if the fetus survives until midgestation, and if a targeted ultrasound at 20 to 22 weeks fails to reveal any abnormalities, the risk of an adverse perinatal outcome and postriatal developmental delay is not statistically increased. (c) 2005 Elsevier Inc. All rights reserved.
Keywords:
nuchal translucency
karyotype
genetic syndrome
structural anomaly
pathophysiology
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