Pronuclear morphology evaluation with subsequent evaluation of embryo morphology significantly increases implantation rates

Zsolt P. Nagy, Dmitri Dozortsev, Michael Peter Diamond, Laura Rienzi, Filippo Ubaldi, Roger Abdelmassih, Ermanno Greco

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Objective: To elucidate the relative predictive value of implantation markers at different stages of preimplantation development. Design: Correlation of pronuclear morphology with embryo morphology and implantation rates in retrospective and prospective analysis of in vitro fertilization/intracytoplasmic sperm injection (IVF-ICSI) treatment cycles. Setting: Private infertility center. Patient(s): A total of 441 couples undergoing infertility treatment. Intervention(s): None. Main outcome measure(s): Size of pronuclei and distance between them, the number and polarization of nucleolus precursor bodies (NPB) at the one-cell stage, embryo cleavage and fragmentation rates on days 2 and 3, and pregnancy and implantation rates. Result(s): Polarization of the NPB in both pronuclei had a statistically significant correlation with normal membrane breakage during ICSI (40%, compared with 33% easy, and 31% difficult membrane breakage) and also with faster cleavage and lower fragmentation rates of embryos. Sixty-one percent of implanting embryos had polarization of the NPB in both pronuclei compared with 37% for all embryos. Larger distance between pronuclei and their unequal size had a statistically significant correlation with slower cleavage and inferior embryo quality. Embryo selection based on only pronuclear morphology or on only day-3 embryo morphology yielded implantation rates of 15.1% and 12.1%, respectively. Embryo selection based on sequential evaluation of both pronuclear morphology and embryo morphology on day 3 resulted in a 21.1% implantation rate. Conclusion(s): Polarization of NPB in both pronuclei is as reliable marker of implantation as embryo morphology on day 3. However, pronuclear morphology assessment improves embryo selection only when it is combined with embryo morphology evaluation on day 3.

Original languageEnglish (US)
Pages (from-to)67-74
Number of pages8
JournalFertility and Sterility
Volume80
Issue number1
DOIs
StatePublished - Jul 1 2003
Externally publishedYes

Fingerprint

Embryonic Structures
Intracytoplasmic Sperm Injections
Infertility
Membranes
Pregnancy Rate
Fertilization in Vitro
Outcome Assessment (Health Care)
Therapeutics

Keywords

  • Embryo quality
  • Fertilization
  • ICSI
  • Implantation
  • Nucleolus precursor bodies
  • Pronucleus
  • Zygote

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology

Cite this

Pronuclear morphology evaluation with subsequent evaluation of embryo morphology significantly increases implantation rates. / Nagy, Zsolt P.; Dozortsev, Dmitri; Diamond, Michael Peter; Rienzi, Laura; Ubaldi, Filippo; Abdelmassih, Roger; Greco, Ermanno.

In: Fertility and Sterility, Vol. 80, No. 1, 01.07.2003, p. 67-74.

Research output: Contribution to journalArticle

Nagy, Zsolt P. ; Dozortsev, Dmitri ; Diamond, Michael Peter ; Rienzi, Laura ; Ubaldi, Filippo ; Abdelmassih, Roger ; Greco, Ermanno. / Pronuclear morphology evaluation with subsequent evaluation of embryo morphology significantly increases implantation rates. In: Fertility and Sterility. 2003 ; Vol. 80, No. 1. pp. 67-74.
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abstract = "Objective: To elucidate the relative predictive value of implantation markers at different stages of preimplantation development. Design: Correlation of pronuclear morphology with embryo morphology and implantation rates in retrospective and prospective analysis of in vitro fertilization/intracytoplasmic sperm injection (IVF-ICSI) treatment cycles. Setting: Private infertility center. Patient(s): A total of 441 couples undergoing infertility treatment. Intervention(s): None. Main outcome measure(s): Size of pronuclei and distance between them, the number and polarization of nucleolus precursor bodies (NPB) at the one-cell stage, embryo cleavage and fragmentation rates on days 2 and 3, and pregnancy and implantation rates. Result(s): Polarization of the NPB in both pronuclei had a statistically significant correlation with normal membrane breakage during ICSI (40{\%}, compared with 33{\%} easy, and 31{\%} difficult membrane breakage) and also with faster cleavage and lower fragmentation rates of embryos. Sixty-one percent of implanting embryos had polarization of the NPB in both pronuclei compared with 37{\%} for all embryos. Larger distance between pronuclei and their unequal size had a statistically significant correlation with slower cleavage and inferior embryo quality. Embryo selection based on only pronuclear morphology or on only day-3 embryo morphology yielded implantation rates of 15.1{\%} and 12.1{\%}, respectively. Embryo selection based on sequential evaluation of both pronuclear morphology and embryo morphology on day 3 resulted in a 21.1{\%} implantation rate. Conclusion(s): Polarization of NPB in both pronuclei is as reliable marker of implantation as embryo morphology on day 3. However, pronuclear morphology assessment improves embryo selection only when it is combined with embryo morphology evaluation on day 3.",
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AU - Diamond, Michael Peter

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AU - Greco, Ermanno

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KW - Nucleolus precursor bodies

KW - Pronucleus

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