title: A randomized study of transcervical intrafallopian transfer of pronucleate embryos controlled by ultrasound versus intrauterine transfer of four- to eight-cell embryos.
abstract: OBJECTIVE
  To establish the value of transcervical intrafallopian transfer of zygotes and the accuracy of fallopian cannulation.
  
  
  METHODS
  A prospective randomized study, comparing ultrasonically controlled transcervical intrafallopian transfer of zygotes with intrauterine transfer of cleaved embryos.
  
  
  METHODS
  Department of IVF of the Rotterdam Academic Hospital.
  
  
  METHODS
  One hundred forty-five patients with patent tubes entered the IVF program.
  
  
  METHODS
  Pregnancy rates in both groups and ultrasound (US) assessment during fallopian cannulation and ET.
  
  
  RESULTS
  Transvaginal cannulation of the tube appears not to be sufficiently accurate when performed without US guidance. Catheter damage occurred in many cases. The previously reported superior implantation rate after intrafallopian transfer in comparison with intrauterine transfer could not be confirmed.
  
  
  CONCLUSIONS
  Intrauterine transfer of cleaved embryos remains the method of choice in IVF.
authors.affiliation: Department of Obstetrics and Gynecology, Academic Hospital Dijkzigt, Erasmus University Rotterdam, The Netherlands.
authors.forename: M C
authors.initials: MC
authors.lastname: Scholtes
authors.forename: B J
authors.initials: BJ
authors.lastname: Roozenburg
authors.forename: A
authors.initials: A
authors.lastname: Verhoeff
authors.forename: G H
authors.initials: GH
authors.lastname: Zeilmaker
mesh_terms: D000328:Adult; D002404:Catheterization / Q000379:methods; D010064:Embryo Implantation; D004624:Embryo Transfer / Q000379:methods*; D005187:Fallopian Tubes / Q000000981:diagnostic imaging; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D011446:Prospective Studies; D016216:Ultrasonography, Prenatal; D017388:Zygote Intrafallopian Transfer / Q000379:methods*