Human Reproduction, Vol 12, 2002-2005, Copyright © 1997 by Oxford University Press
FJ Ectors, P Vanderzwalmen, J Van Hoeck, M Nijs, G Verhaegen, A Delvigne, R Schoysman and F Leroy
The aim of this work was to evaluate the relationship between follicular
size at the time of oocyte retrieval, and the subsequent oocyte competence
to be fertilized and to develop in vitro. All the obtained oocytes were
classified according to the corresponding volume of aspirated follicular
fluid. Aspirated volume of follicular fluid <2 ml corresponded to a
follicular diameter <16 mm and constituted the small size group. Volume
of follicular fluid from 2 to 6 ml corresponded to a diameter from 16 to 23
mm and constituted the medium size group. The large size group contained
follicles with diameter >23 mm and corresponded to an aspirated volume
of follicular fluid of >6 ml. A progressive and significant increase in
the rates of oocytes with a first polar body was observed from the small
size group to the other groups and from the medium to the large size group:
75.3, 85.9 and 95.3% respectively. After classical in-vitro fertilization
(IVF), significantly better rates of fertilization and development were
obtained in the medium size group compared to the two other groups.
Moreover, a positive relationship was observed between follicular diameter
and rates of embryos scored as 'good' when oocytes were fertilized by
intracytoplasmic sperm injection (ICSI). These results demonstrated that
follicular size is positively related to the oocyte ability to be
fertilized and to develop. Although oocytes from small follicles gave lower
percentages of development probably due to partial oocyte incompetence,
they allowed an increase in the total number of embryos scored as 'good'.
ARTICLES
Relationship of human follicular diameter with oocyte fertilization and development after in-vitro fertilization or intracytoplasmic sperm injection
Clinique de Procreation Assistee, CHU St-Pierre, Brussels, Belgium.
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