title: Modern embryo transfer catheters and pregnancy outcome: a prospective randomized trial.
abstract: OBJECTIVE
  Embryo transfer (ET) is the final crucial step in IVF treatment. The type of catheter used can affect the pregnancy rate (PR). In this prospective, randomized trial we compared the clinical PR between the Wallace and the Cook K-Jet embryo transfer catheters.
  
  
  METHODS
  Prospective, randomized clinical trial.
  
  
  METHODS
  A National Health Service Assisted Reproduction Unit.
  
  
  METHODS
  One hundred fifty women undergoing a fresh ET. Age more than 40 years, a high basal FSH, a previous difficult ET, or more than six previous ETs were the exclusion criteria.
  
  
  METHODS
  Women undergoing a fresh ET were randomized at the time of ET to either the Cook K-Jet or Wallace embryo transfer catheter. The randomization was stratified according to age and the number of previous ETs.
  
  
  METHODS
  Clinical PR.
  
  
  RESULTS
  There was no significant difference in the clinical PR between the Wallace and the Cook catheters (22/75 [29.3%] and 23/75 [30.6%], relative risk [RR]: 0.96 [95% confidence interval 0.58-1.58]).
  
  
  CONCLUSIONS
  There is no significant difference in the PRs achieved by modern, soft, double-lumen ET catheters.
authors.affiliation: The Jessop Wing, University of Sheffield, Sheffield, United Kingdom.
authors.forename: Myvanwy
authors.initials: M
authors.lastname: McIlveen
authors.forename: Fong Derek
authors.initials: FD
authors.lastname: Lok
authors.forename: Jane
authors.initials: J
authors.lastname: Pritchard
authors.forename: Hany
authors.initials: H
authors.lastname: Lashen
mesh_terms: D000328:Adult; D001604:Berlin; D002404:Catheterization / Q000706:statistics & numerical data; D016009:Chi-Square Distribution; D004624:Embryo Transfer / Q000295:instrumentation* / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology*; D011446:Prospective Studies