title: Comparison of the clinical outcomes between fresh blastocyst and vitrified-thawed blastocyst transfer.
abstract: OBJECTIVE
  To compare the clinical outcomes between fresh and vitrified-thawed day 5 blastocyst transfers.
  
  
  METHODS
  Retrospective case control study.
  
  
  METHODS
  Tertiary referral center.
  
  
  METHODS
  Patients 38 years of age or less who underwent IVF/ICSI cycles with fresh or frozen-thawed blastocysts transferred from June 1, 2009 to November 30, 2011
  
  
  METHODS
  Vitrification and thawing of day 5 blastocysts using the Cryotop method. (Kitazato BioPharma Co., Ltd., Fuji city, Shizuoka, Japan)
  
  
  METHODS
  Clinical pregnancy rate, implantation rate, ongoing pregnancy rate, and multiple pregnancy rates.
  
  
  RESULTS
  Of the 118 cycles in the fresh transfer group, 234 blastocysts were transferred. The clinical pregnancy rate was 66.1 % and implantation rate was 50.9 %. The ongoing pregnancy rate was 56.8 % and the rates for singleton and twin pregnancies were 53.7 % and 44.8 %. Of the 59 cycles in the vitrified-thawed group, 111 blastocysts were transferred. The clinical pregnancy rate was 59.3 % and implantation rate was 43.2 %. The ongoing pregnancy rate was 47.5 % and the rates for singleton and twin pregnancies were 60.7 % and 39.3 %. The clinical pregnancy rate, implantation rate and ongoing pregnancy rate did not differ significantly between the two groups.
  
  
  CONCLUSIONS
  The implantation rates were not significantly different between the fresh and the vitrified-thawed groups. Thus, single embryo transfer may be considered in fresh cycles to decrease multiple pregnancy rates. The surplus embryos should be vitrified for the frozen embryo transfer to improve the cumulative pregnancy rate.
authors.affiliation: Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan.
authors.forename: Pei-Yun
authors.initials: PY
authors.lastname: Ku
authors.forename: Robert Kuo-Kuang
authors.initials: RK
authors.lastname: Lee
authors.forename: Shyr-Yeu
authors.initials: SY
authors.lastname: Lin
authors.forename: Ming-Huei
authors.initials: MH
authors.lastname: Lin
authors.forename: Yuh-Ming
authors.initials: YM
authors.lastname: Hwu
mesh_terms: D000328:Adult; D001755:Blastocyst / Q000166:cytology / Q000502:physiology; D016022:Case-Control Studies; D015925:Cryopreservation / Q000379:methods; D010064:Embryo Implantation; D004624:Embryo Transfer / Q000379:methods*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D018873:Pregnancy Rate; D012189:Retrospective Studies; D056826:Single Embryo Transfer; D020554:Sperm Injections, Intracytoplasmic; D058989:Vitrification