Egg maturity assessment prior to ICSI prevents premature fertilization of late-maturing oocytes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14110%2F19%3A00110498" target="_blank" >RIV/00216224:14110/19:00110498 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007%2Fs10815-018-1393-0" target="_blank" >https://link.springer.com/article/10.1007%2Fs10815-018-1393-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10815-018-1393-0" target="_blank" >10.1007/s10815-018-1393-0</a>

Result language

angličtina

Original language name

Egg maturity assessment prior to ICSI prevents premature fertilization of late-maturing oocytes

Original language description

Propose The presence of metaphase II (MII) spindle together with the polar body (PB) indicates completion of oocyte maturation. This study was designed to explore if spindle imaging can be used to optimize timing of intracytoplasmic sperm injection (ICSI). Methods The study involved 916 oocytes from 234 conventionally stimulated ICSI cycles with an unexpectedly poor ovarian response. All PB-displaying oocytes were subjected to polarized light microscopy (PLM) prior to ICSI. When MII spindle was absent in the majority of oocytes, ICSI was postponed and performed after additional spindle imaging. Fertilization, embryo development, and clinical outcome were evaluated with respect to the observed spindle pattern. Results The visible spindle was absent in 32.64% of PB-displaying oocytes. The late-maturing oocytes extruding PB in vitro were less likely to exhibit a spindle signal than in vivo matured MII oocytes (38.86% vs. 89.84%). When fertilization was postponed, 59.39% of initially spindle-negative oocytes developed detectable MII spindle. Spindled eggs had significantly higher developmental potential, and the presence of the spindle has been identified as an independent measure for predicting the formation of the blastocyst. Embryos derived from spindle-positive oocytes also showed a higher chance to implant and develop to term. Notably, 11 children were conceived by finely timed fertilization of late-maturing oocytes which are normally discarded. Conclusions The study confirms the prognostic value of spindle imaging and demonstrates that immature oocytes can be clinically utilized and give rise to live births when the timing of ICSI is adjusted to their developmental stage.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

30214 - Obstetrics and gynaecology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Assisted Reproduction and Genetics

ISSN

1058-0468

e-ISSN

1573-7330

Volume of the periodical

36

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

8

Pages from-to

445-452

UT code for WoS article

000463773900011

EID of the result in the Scopus database

2-s2.0-85059911052