title: Polycystic ovaries and ovarian hyperstimulation syndrome: a systematic review*.
abstract: OBJECTIVE
  To assess and quantify the relationship between polycystic ovaries (PCOs) and ovarian hyperstimulation syndrome (OHSS).
  
  
  METHODS
  Published studies, any language, identified through MEDLINE, EMBASE, BIOSIS, Web of Science, and bibliographies. Studies were selected if exposure (ultrasound findings of PCO before treatment) and outcome (OHSS) could be abstracted to two-by-two tables.
  
  
  RESULTS
  Ten studies, meeting inclusion and exclusion criteria, were analyzed. When PCO were present, the combined odds ratio for OHSS was 6.8 (95% confidence interval 4.9-9.6).
  
  
  CONCLUSIONS
  There is a significant and consistent relationship between PCO and OHSS. When PCO are present before treatment with assisted reproduction, deliberate policies to moderate treatment appear justified.
authors.affiliation: Mayo Clinic, Rochester, Minnesota, USA. tummon.ian@mayo.edu
authors.forename: Ian
authors.initials: I
authors.lastname: Tummon
authors.forename: Larisa
authors.initials: L
authors.lastname: Gavrilova-Jordan
authors.forename: Michael C
authors.initials: MC
authors.lastname: Allemand
authors.forename: Donna
authors.initials: D
authors.lastname: Session
mesh_terms: D005260:Female; D006801:Humans; D016471:Ovarian Hyperstimulation Syndrome / Q000175:diagnosis / Q000209:etiology* / Q000628:therapy; D011085:Polycystic Ovary Syndrome / Q000150:complications* / Q000175:diagnosis / Q000628:therapy; D012307:Risk Factors