Document Detail

Relation between increased fetal nuchal translucency thickness and chromosomal defects.
MedLine Citation:
PMID:  16394033     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To examine the prevalence and distribution of all chromosomal defects in fetuses with increased nuchal translucency thickness. METHODS: Assessment of risk for trisomy 21 was carried out by a combination of maternal age and fetal nuchal translucency thickness at 11-13 + 6 weeks. A search of the database was made to identify, first, all singleton pregnancies in which fetal karyotyping was carried out and, second, the cases where the fetal nuchal translucency was equal to or above the 95th centile for fetal crown-rump length. The prevalence and distribution of chromosomal defects were determined for each nuchal translucency category: between the 95th centile for crown-rump length and 3.4 mm, 3.5-4.4 mm, 4.5-5.4 mm, 5.5-6.4 mm, 6.5-7.4 mm, 7.5-8.4 mm, 8.5-9.4 mm, 9.5-10.4 mm, 10.5-11.4 mm, and 11.5 mm or more. RESULTS: The search identified 11,315 pregnancies. The median maternal age was 34.5 (range 15-50) years, and the median fetal crown-rump length was 64 (range 45-84) mm. The fetal karyotype was abnormal in 2,168 (19.2%) pregnancies, and the incidence of chromosomal defects increased with nuchal translucency thickness from approximately 7% for those with nuchal translucency between the 95th centile for crown-rump length and 3.4 mm to 75% for nuchal translucency of 8.5 mm or more. In the majority of fetuses with trisomy 21, the nuchal translucency thickness was less then 4.5 mm, whereas in the majority of fetuses with trisomies 13 or 18 it was 4.5-8.4 mm, and in those with Turner syndrome it was 8.5 mm or more. CONCLUSION: In fetuses with increased nuchal translucency, approximately one half of the chromosomally abnormal group is affected by defects other than trisomy 21. The distribution of nuchal translucency is different for each type of chromosomal defect. LEVEL OF EVIDENCE: II-3.
Karl Oliver Kagan; Kyriaki Avgidou; Francisca S Molina; Katarzyna Gajewska; Kypros H Nicolaides
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  107     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-05     Completed Date:  2006-03-02     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6-10     Citation Subset:  AIM; IM    
Harris Birthright Research Centre for Fetal Medicine, King's College Hospital Medical School, London, United Kingdom.
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MeSH Terms
Chromosome Aberrations*
Down Syndrome / epidemiology,  genetics,  ultrasonography
Genetic Counseling*
Genetic Predisposition to Disease*
Maternal Age
Middle Aged
Nuchal Translucency Measurement / methods*
Pregnancy Trimester, First
Retrospective Studies
Risk Assessment
Ultrasonography, Prenatal / methods
Comment In:
Obstet Gynecol. 2006 Jan;107(1):2-3   [PMID:  16394031 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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