title: [First pregnancy achieved by modified natural cycle in a low responder patient's in Centro Médico Nacional 20 de Noviembre, ISSSTE].
abstract: There was a patient who went to fertilization in vitro, the control ovarian stimulation was using GnRHa in the luteal phase and FSHr 500 IU, she had poor response so she went into a new stimulation protocol using GnRH antagonist. The follow up was made since the 3rd day of menstruation with ultrasound scans, when the follicle reached 14 mm, the antagonist was started with minimal dosage of FSHr until the administration of hCG 10,000 IU. Oocyte retrieval was performed 36 hours later. The embryo transfer was made after 72 hours, was transferred 1 embryo quality 1+, 2 cells, 10% fragmentation. This protocol is named natural cycle modified and is an option to achieve a pregnancy in patients with poor response with their own cells, when the patient refused oocyte donation or if there isn't that kind of program in the reproductive center like us because is not allowed.
authors.affiliation: Departamento de Biología de la Reproducción, cuarto piso, Centro Médico Nacional 20 de Noviembre, ISSSTE, México, DF. dramejia79@hotmail.com
authors.forename: Cecilia Berenice
authors.initials: CB
authors.lastname: Mejía-Medina
authors.forename: J Daniel
authors.initials: JD
authors.lastname: Moreno-García
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Regalado
mesh_terms: D000328:Adult; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D010062:Ovulation Induction; D011247:Pregnancy