Direct assessment of the rate of chromosomal abnormalities in grade IV human embryos produced by in-vitro fertilization procedure.
Hum Reprod
; 9(2): 293-302, 1994 Feb.
Article
en En
| MEDLINE
| ID: mdl-8027286
ABSTRACT
During in-vitro fertilization (IVF) procedures, human preimplantation embryos were classified into four grades according to their morphological appearance under light microscopy. The grade IV group included poor quality embryos. In our IVF programme, these embryos were never transferred or frozen, and were thus available for cytogenetic analysis. Cytogenetic analysis was performed on 411 grade IV embryos from 327 couples participating in the IVF programme. A total of 118 embryos were successfully karyotyped using at least one metaphase. Normal diploid chromosomes were found in only 12 embryos, containing a total of 19 metaphases. All others (90%) showed abnormal or aberrant chromosome complements; 48 were aneuploid and six cases of single chromatids were noted; 14 embryos (11.8%) contained haploid complements, while the remaining 44 exhibited mosaics (2n/3n, n/2n, n/3n) or fragmented chromosome sets. Also, several structural aberrations and rearrangements were observed. These results indicate that the large majority of grade IV human embryos are chromosomally abnormal. This confirms the morphological assessment of the poor quality of these embryos and demonstrates the uselessness of both the transfer and the cryopreservation of grade IV embryos.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Blastocisto
/
Fertilización In Vitro
/
Aberraciones Cromosómicas
Límite:
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
Hum Reprod
Asunto de la revista:
MEDICINA REPRODUTIVA
Año:
1994
Tipo del documento:
Article
País de afiliación:
Francia