title: Clinical and endocrine response to the withdrawal of gonadotropin-releasing hormone agonists during prolonged coasting.
abstract: OBJECTIVE
  To compare the clinical and endocrine response of cycles in which GnRH agonists (GnRH-a) were stopped with cycles in which the agonists were continued during coasting.
  
  
  METHODS
  Retrospective study of stimulation cycles using flare and luteal agonist protocols.
  
  
  METHODS
  Academic.
  
  
  METHODS
  Fifty-nine IVF and intracytoplasmic sperm injection (ICSI) treatment cycles in 57 women, coasted for 3 or more days.
  
  
  METHODS
  The GnRH-a were withdrawn when E(2) levels continued to increase during coasting.
  
  
  METHODS
  Hormone concentrations, ultrasound findings, cycle cancellation, ovarian hyperstimulation syndrome (OHSS), oocyte retrieval, fertilization, embryo transfer, and clinical pregnancy rates (PR).
  
  
  RESULTS
  In the GnRH-a withdrawn group E(2) levels decreased by 63% (18,043-6,656 pmol/L) without cycle cancellations or cases of severe OHSS. In the agonist continuation group, the spontaneous E(2) decrease was 29% (14,205-10,132 pmol/L) with cycle cancellation and severe OHSS rates of 9.5% (4/42) and 4.8% (2/42), respectively. Oocyte retrieval, fertilization, embryo transfer, and clinical PRs were not compromised by stopping the agonists. Variations in the dynamic responses of FSH, LH, anti-Müllerian hormone, P, and androstenedione (A) levels in these cycles are described.
  
  
  CONCLUSIONS
  Withdrawal of GnRH-a during coasting interrupted increasing E(2) levels, prevented cycle cancellation, and mitigated the risk of OHSS in this high risk group without compromising oocyte retrieval, fertilization, embryo transfer, or PRs.
authors.affiliation: Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Faculty of Medicine, The University of British Columbia, Vancouver, British Columbia, Canada. bhoyuen@interchange.ubc.ca
authors.forename: Basil
authors.initials: B
authors.lastname: Ho Yuen
authors.forename: Tuan-Anh T
authors.initials: TA
authors.lastname: Nguyen
authors.forename: Anthony P
authors.initials: AP
authors.lastname: Cheung
authors.forename: Peter C K
authors.initials: PC
authors.lastname: Leung
mesh_terms: D000328:Adult; D015232:Dinoprostone / Q000097:blood*; D004334:Drug Administration Schedule; D005260:Female; D005300:Fertility Agents, Female / Q000008:administration & dosage*; D005307:Fertilization in Vitro / Q000379:methods*; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists*; D006801:Humans; D007247:Infertility, Female / Q000097:blood* / Q000628:therapy*; D010062:Ovulation Induction / Q000379:methods*; D011247:Pregnancy; D011256:Pregnancy Outcome; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D005300:Fertility Agents, Female; D007987:Gonadotropin-Releasing Hormone; D015232:Dinoprostone