title: Success rate with repeated cycles of in vitro fertilization-embryo transfer.
abstract: OBJECTIVE
  To analyze data from a large multicenter study to determine whether pregnancy and delivery rates decrease with repeated IVF-ET cycles.
  
  
  METHODS
  Multicenter retrospective study.
  
  
  METHODS
  Participating centers from the Society of Assisted Reproductive Technology.
  
  
  METHODS
  Fifty-four centers contributed 4,043 cycles of oocyte retrieval for uterine transfer.
  
  
  METHODS
  Oocyte retrieval for uterine transfer.
  
  
  METHODS
  Pregnancy and delivery rates, analyzed according to age, program success rate, and whether the program was doing assisted hatching.
  
  
  RESULTS
  Pregnancy and delivery rates for cycles 1, 2, 3, 4, and >4 were 33.7% and 27.0%, 33.9% and 27.4%, 28.9% and 23.4%. 25.9% and 16.1%, and 21.0% and 15.4%, respectively. The pregnancy rate decreased significantly for >4 cycle; delivery rate decreased significantly for cycles 4 and >4. Assisted hatching was strongly related to better odds of pregnancy (OR, 1.50) and delivery (OR, 1.44) in women under age 40, and for pregnancy (1.64) in women age 40-42 years.
  
  
  CONCLUSIONS
  Success rates do not decrease markedly with repeated IVF attempts, and the decrease did not change with program success rate, suggesting the IVF population is not markedly heterogeneous. Uncontrolled studies of new treatments for cycle repeaters cannot assume that success rate is poor without a treatment change.
authors.affiliation: Society for Assisted Reproductive Technology, Birmingham, Alabama, USA.
authors.forename: D R
authors.initials: DR
authors.lastname: Meldrum
authors.forename: K M
authors.initials: KM
authors.lastname: Silverberg
authors.forename: M
authors.initials: M
authors.lastname: Bustillo
authors.forename: L
authors.initials: L
authors.lastname: Stokes
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology; D036861:Delivery, Obstetric; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D008423:Maternal Age; D008846:Micromanipulation; D016017:Odds Ratio; D011247:Pregnancy; D018873:Pregnancy Rate; D018566:Pregnancy, High-Risk; D019233:Retreatment; D012189:Retrospective Studies