title: Effect of the number and depth of embryos transferred and unilateral or bilateral transfer in tubal embryo transfer (TET).
abstract: OBJECTIVE
  Our purpose was to evaluate the possible effects of the number of embryos transferred, the depth of embryos placed within the tube(s), and unilateral or bilateral tubal transfer on pregnancy initiation in tubal embryo transfer (TET).
  
  
  METHODS
  One hundred eight consecutive TET cycles were analyzed. Oocyte retrievals were carried out by transvaginal ultrasound-guided aspiration of follicles. Forty-eight hours after oocyte retrieval, the developing embryos at the stage of two to four cells were transferred into the fallopian tube(s) by laparoscopy. A maximum of four embryos was transferred to each patient.
  
  
  RESULTS
  The pregnancy rates were similar among the cycles in which two, three, or four embryos were transferred. In addition, there was no significant difference in the pregnancy rate whether the embryos were deposited > 4 cm or between 3 and 4 cm into the tube(s). Although the pregnancy rate was greater in cycles of bilateral tubal transfer, the difference from that of unilateral transfers was not significant.
  
  
  CONCLUSIONS
  Our data indicate that when two to four embryos were transferred and the embryos were placed > or = 3 cm within the tube(s), unilateral or bilateral tubal transfer had little influence on the ultimate success of TET.
authors.affiliation: Department of Obstetrics and Gynaecology, College of Medicine, National Taiwan University, Taipei, R.O.C.
authors.forename: Y S
authors.initials: YS
authors.lastname: Yang
authors.forename: S
authors.initials: S
authors.lastname: Melinda
authors.forename: H N
authors.initials: HN
authors.lastname: Ho
authors.forename: J L
authors.initials: JL
authors.lastname: Hwang
authors.forename: S U
authors.initials: SU
authors.lastname: Chen
authors.forename: H R
authors.initials: HR
authors.lastname: Lin
authors.forename: S C
authors.initials: SC
authors.lastname: Huang
authors.forename: T Y
authors.initials: TY
authors.lastname: Lee
mesh_terms: D004624:Embryo Transfer / Q000379:methods*; D005187:Fallopian Tubes; D005260:Female; D005307:Fertilization in Vitro; D015181:Gamete Intrafallopian Transfer; D006801:Humans; D007246:Infertility / Q000628:therapy; D010062:Ovulation Induction; D011247:Pregnancy; D016896:Treatment Outcome