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Frozen–thawed cleavage stage versus blastocyst stage embryo transfer in high responder patients

Published online by Cambridge University Press:  27 August 2020

Maryam Eftekhar
Affiliation:
Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Banafsheh Mohammadi*
Affiliation:
Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Nasim Tabibnejad
Affiliation:
Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Maryam Mortazavi Lahijani
Affiliation:
Faculty of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
*
Author for correspondence: Banafsheh Mohammadi. Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Bouali Ave, Safayieh, Yazd8916877391, Iran. Tel: +98 353 8247085-6. Fax: +98 353 824 7087. E-mail: banafsheh.mo1360@gmail.com

Summary

Clinical outcomes following frozen–thawed cleavage embryo transfer versus frozen–thawed blastocyst transfer in high responder patients undergoing in vitro fertilisation/intracytoplasmic sperm injection cycles are still debated. In a retrospective study, 106 high responder patients who were candidate for ‘freeze-all embryos’ were recruited. Frozen–thawed embryos were transferred at the cleavage stage (n = 53) or the blastocyst stage (n = 53). Clinical pregnancy was considered as the primary outcome and chemical pregnancy, ongoing pregnancy, implantation rate, and fertilization rate, as well as miscarriage rate, were measured as the secondary outcome. Clinical (47.2% vs. 24.5%), chemical (56.6% vs. 32.1%), and ongoing pregnancy rates (37.7% vs. 17%) as well as implantation rates (33.6% vs. 13.5%) were significantly higher in the blastocyst group compared with the cleavage group respectively (P < 0.05). Miscarriage rate was comparable between groups (P > 0.05). Transfer of frozen–thawed embryos at the blastocyst stage was preferable in the high responder patients to increase implantation, pregnancy and live birth rates compared with cleavage stage embryo transfer.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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