Normal Range of Fetal Nasal Bone Length during the Second Trimester in an Afro-Caribbean Population and Likelihood Ratio for Trisomy 21 of Absent or Hypoplastic Nasal Bone.
Fetal Diagn Ther
; 42(2): 130-136, 2017.
Article
em En
| MEDLINE
| ID: mdl-27764826
OBJECTIVE: To establish the normal reference range of fetal nasal bone length (NBL) during the second trimester in an Afro-Caribbean population and the likelihood ratio (LR) for fetal trisomy 21. METHODS: Prenatal records of euploid, non-malformed singleton fetuses who underwent second-trimester ultrasonographic scans at 20-24 weeks of gestation were retrospectively analyzed for NBL and gestational age (GA). Only Afro-Caribbean couples were selected. The relationship between fetal NBL and GA was determined. The data of all fetuses with Down syndrome were provided by the French West Indies Register of Congenital Malformations (REMALAN). RESULTS: There was a significant linear association between fetal NBL and GA (R2 = 0. 354). The 50th percentile for NBL increased from 5.0 to 7.0 mm from week 20 to 24 of gestation. The nasal bone (NB) was absent or hypoplastic in 8.6% of the euploid fetuses and in 69.2% of the trisomy 21 fetuses. The LR for trisomy 21 of absent or hypoplastic NB in an Afro-Caribbean population was 8.02, but only 2.32 when this sign was isolated. CONCLUSION: The reference range for fetal NBL at 20-24 weeks of gestation in an Afro-Caribbean population and the LR for trisomy 21 of absent or hypoplastic NB differed from the other populations.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Síndrome de Down
/
Osso Nasal
Tipo de estudo:
Diagnostic_studies
/
Observational_studies
Limite:
Female
/
Humans
/
Pregnancy
País/Região como assunto:
Caribe
/
Martinica
Idioma:
En
Revista:
Fetal Diagn Ther
Assunto da revista:
DIAGNOSTICO POR IMAGEM
/
OBSTETRICIA
/
PERINATOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
França
País de publicação:
Suíça