title: Efficacy of hyaluronan-rich transfer medium on implantation and pregnancy rates in fresh and frozen-thawed blastocyst transfers in Korean women with previous implantation failure.
abstract: OBJECTIVE
  To evaluate the effect of hyaluronan-rich transfer medium on pregnancy and implantation rates in fresh and frozen-thawed embryo transfers in Korean women with previous implantation failure.
  
  
  METHODS
  This retrospective study included 283 blastocyst transfers in patients with previous embryo transfer failure at a private fertility clinic. In the study group (n=88), blastocyst transfers were performed using an hyaluronan-rich transfer medium prior to transfer, whereas blastocyst transfers without any treatment served as controls (n=195). According to the type of transfer (fresh elective or frozen-thawed), all the blastocyst transfers were divided into two study and two control groups.
  
  
  RESULTS
  The patient's mean age, serum anti-Müllerian hormone level, causes of infertility, embryo quality, and the number of transferred embryos were comparable between the study and control groups. There were no significant differences in clinical pregnancy rate (45.5% vs. 43.1%), implantation rate (28.9% vs. 28.8%), and clinical abortion rate (10.0% vs. 8.3%) between the two groups, and these findings were not changed after subgroup analysis according to the type of transfer.
  
  
  CONCLUSIONS
  The use of hyaluronan-rich transfer medium in the blastocyst transfer does not appear to have any significant effect on the implantation and pregnancy rates in patients with previous implantation failure.
authors.affiliation: Department of Obstetrics and Gynecology, Inje University Haeundae Paik Hospital, Busan, Korea.
authors.forename: Sungwook
authors.initials: S
authors.lastname: Chun
authors.affiliation: Busan Maria Fertility Clinic, Busan, Korea.
authors.forename: Jung Eun
authors.initials: JE
authors.lastname: Seo
authors.affiliation: Busan Maria Fertility Clinic, Busan, Korea.
authors.forename: Yun Jeung
authors.initials: YJ
authors.lastname: Rim
authors.affiliation: Busan Maria Fertility Clinic, Busan, Korea.
authors.forename: Jae Hong
authors.initials: JH
authors.lastname: Joo
authors.affiliation: Busan Maria Fertility Clinic, Busan, Korea.
authors.forename: Yong Chan
authors.initials: YC
authors.lastname: Lee
authors.affiliation: Busan Maria Fertility Clinic, Busan, Korea.
authors.forename: Yun Hee
authors.identifier: 0000-0002-3968-6439
authors.initials: YH
authors.lastname: Koo
keywords: Blastocyst; Embryo transfer; Hyaluronic acid; Implantation; Pregnancy