胚胎原核崩解小於21h通常不易懷孕

使用即時監測培養系統 time-lapse，觀察胚胎原核(PN)崩解時間(PNB)，可用於預測胚胎著床率,

PNB<21h通常胚胎不易懷孕

http://humrep.oxfordjournals.org/content/27/9/2641.abstract

The impact of pronuclei morphology and dynamicity on live birth outcome after time-lapse culture

1. A. Azzarello*, 
2. T. Hoest and 
3. A.L. Mikkelsen

+Author Affiliations

1. The Fertility Clinic, Holbaek Regional Hospital, Copenhagen University, Smedelundsgade 60, DK-4300 Holbaek, Denmark

1. ↵Correspondence address. E-mail: aaz@regionsjaelland.dk

• Received February 16, 2012.
• Revision received May 11, 2012.
• Accepted May 15, 2012.

Abstract

STUDY QUESTION Can the pronuclei (PN) morphology and the time of PN breakdown (PNB) predict the potential of embryos to result in live birth?

SUMMARY ANSWER In comparison to embryos resulting in no live birth, PNB occurred significantly later in embryos resulting in live birth and never earlier than 20 h 45min. None of the tested scoring systems were shown to predict the live birth outcome in a time-lapse set-up.

WHAT IS KNOWN ALREADY The PN morphology is supported as a prominent embryo selection parameter in single light microscopy observations, although controversial results have been reported.

STUDY DESIGN, SIZE, DURATION This was a prospective study of 159 embryos, all of which were later transferred. The PN morphology of 46 embryos which resulted in live birth was compared with that of 113 embryos which resulted in no live birth.

PARTICIPANTS, SETTING From 1 March 2010 to 30 August 2011, 130 couples underwent fertility treatment by ICSI. Embryo culture was performed in a time-lapse set-up from fertilization to intrauterine transfer. PN morphological assessment was performed on every embryo replaced, using six different scoring systems at different times.

MAIN RESULTS AND THE ROLE OF CHANCE No embryo with PNB earlier than 20 h 45 min resulted in live birth. All six PN assessment models showed no significant distribution of scores (P = NS) between the live birth and no live birth groups at 16 h post-fertilization (PF), 18 h PF and 40 min before PNB. The outcomes of assessments changed significantly (P < 0.001) over time and the time of PNB was found to be the optimal stage to evaluate the PN morphology.

LIMITATIONS, REASONS FOR CAUTION The study includes only embryos reaching the 4-cell stage after ICSI, and transferred at 44 h PF.

WIDER IMPLICATIONS OF THE FINDINGS The PN morphology changes over time, indicating that the single light microscopy observation approach is deficient in comparison to time-lapse. Although the assessment of the PN morphology does not improve embryo selection, the timing of PNB should be included in embryo selection parameters.