title: [Assisted hatching following embryo implantation failure].
abstract: BACKGROUND
  Assisted hatching in reproduction techniques has improved the successful implantation rates in certain groups of patients with poor prognosis. This study focuses on its effect in groups of patients with previous implantation failure and according to age groups.
  
  
  OBJECTIVE
  Compare the pregnancy rates of patients who turned to this technique following an implantation failure using in vitro fertilization with those of patients who did not use assisted hatching before another attempt of in vitro fertilization and according to specific age groups.
  
  
  METHODS
  Cases of patients using assisted hatching in our Center between January 2008 and December 2009 were studied. The results were compared in terms of age in three groups: group I, >35 years; group II, 35-39 years, and group III, > 40 years.
  
  
  RESULTS
  Patients in group II had better pregnancy rate (30%) than those in groups I and III (16.98 and 20.83%, respectively). When comparing the results of the group of patients using assisted hatching with those of the group that did not, the first reported a 20% pregnancy rate versus no pregnancy in the other group.
authors.affiliation: Laboratorio de Reproducción Asistida, Centro Mexicano de Fertilidad, Huixquilucan, Estado de México, México.
authors.forename: Esperanza
authors.initials: E
authors.lastname: Carballo Mondragón
authors.forename: Leonor
authors.initials: L
authors.lastname: Durán Monterrosas
authors.forename: Jorge A
authors.initials: JA
authors.lastname: Campos Cañas
authors.forename: Patricia
authors.initials: P
authors.lastname: González de Jesús
authors.forename: Alberto
authors.initials: A
authors.lastname: Kably Ambe
mesh_terms: D010064:Embryo Implantation; D004624:Embryo Transfer; D005260:Female; D006801:Humans; D011247:Pregnancy / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D017211:Treatment Failure; D055815:Young Adult