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Article

Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients

  • Authors:
    • En-Hua Wang
    • An-Cong Wang
    • Bao-Song Wang
    • Bin Li
  • View Affiliations / Copyright

    Affiliations: Department of Genetic Teaching and Research Section, Shandong Medical College, Linyi, Shandong 276000, P.R. China, Department of Reproductive Medicine, Linyi People's Hospital, Linyi, Shandong 276003, P.R. China
  • Pages: 376-382
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    Published online on: July 13, 2016
       https://doi.org/10.3892/br.2016.716
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Abstract

The aim of the present study was to determine whether the size of the zona pellucida (ZP) thinning area by laser-assisted hatching affected the potential development of vitrified-warmed embryos. A total of 196 vitrified-warmed cleavage-stage embryos (from 49 patients, four sister embryos per patient) were used in the study, i.e., four sister embryos from each patient were randomly assigned to four groups: a control group of embryos that were not zona-manipulated (zona intact, group A); one experimental group of embryos in which a quarter of the zona pellucida was thinned using laser‑assisted ZP thinning (group B); a second experimental group of embryos in which half of ZP was thinned (group C); and a third group in which two-thirds of the ZP was thinned (group D). Subsequent blastocyst development was assessed. Microscopy was performed to study the hatching process of the embryos after zona thinning. The blastocyst formation rates were 71.43% in group A, 67.35% in group B, 65.31% in group C, and 51.02% in group D (groups B-D vs. group A, P=0.661, P=0.515, P=0.038, respectively). The rates of complete hatching were 30.61% in group A, 38.78% in group B, 61.22% in group C, and 48.98% in group D (groups B-D vs. group A, P=0.396, P=0.002, P=0.063, respectively). For a subgroup of patients, there was a significant difference in the complete hatching in all the groups for women aged <35 years (P=0.011), and there was a significant difference in the complete hatching in all the groups for secondary infertility women (P=0.022). There was no significant difference in the blastocyst formation rates in the different groups of women aged ≥35 years (P=0.340). In addition, there was no significant difference in the complete hatching in the different groups among women aged ≥35 years (P=0.492). The results of the present study showed that in vitrified-warmed embryo transfers at the cleavage-stage, and the two-thirds zona pellucida thinning group demonstrated a significantly decreased blastocyst formation rate compared with the control group, while the half zona pellucida thinning group demonstrated a significantly increased complete hatching rate compared with the control group, which may have a high value in clinical application.
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Copy and paste a formatted citation
Spandidos Publications style
Wang E, Wang A, Wang B and Li B: Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients. Biomed Rep 5: 376-382, 2016.
APA
Wang, E., Wang, A., Wang, B., & Li, B. (2016). Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients. Biomedical Reports, 5, 376-382. https://doi.org/10.3892/br.2016.716
MLA
Wang, E., Wang, A., Wang, B., Li, B."Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients". Biomedical Reports 5.3 (2016): 376-382.
Chicago
Wang, E., Wang, A., Wang, B., Li, B."Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients". Biomedical Reports 5, no. 3 (2016): 376-382. https://doi.org/10.3892/br.2016.716
Copy and paste a formatted citation
x
Spandidos Publications style
Wang E, Wang A, Wang B and Li B: Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients. Biomed Rep 5: 376-382, 2016.
APA
Wang, E., Wang, A., Wang, B., & Li, B. (2016). Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients. Biomedical Reports, 5, 376-382. https://doi.org/10.3892/br.2016.716
MLA
Wang, E., Wang, A., Wang, B., Li, B."Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients". Biomedical Reports 5.3 (2016): 376-382.
Chicago
Wang, E., Wang, A., Wang, B., Li, B."Outcomes of vitrified-warmed cleavage-stage embryo hatching after in vitro laser-assisted zona pellucida thinning in patients". Biomedical Reports 5, no. 3 (2016): 376-382. https://doi.org/10.3892/br.2016.716
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