title: Low intraovarian vascular resistance: a marker for severe ovarian hyperstimulation syndrome.
abstract: OBJECTIVE
  To assess intraovarian blood flow in relation to the severity of ovarian hyperstimulation syndrome (OHSS) after controlled ovarian hyperstimulation.
  
  
  METHODS
  A prospective study.
  
  
  METHODS
  Monash IVF, Clayton, Victoria, Australia.
  
  
  METHODS
  Thirty patients with OHSS after embryo or gamete transfer who also had sonographic evidence of ascites.
  
  
  METHODS
  The resistance to blood flow within the ovaries of 11 patients with severe OHSS and 19 patients with mild OHSS was measured by using transabdominal ultrasonography with color flow and pulsed Doppler imaging.
  
  
  RESULTS
  The pulsatility index (PI), resistance index (RI), and the S-D ratio, all measures of downstream vascular impedance, were significantly lower in those patients with severe OHSS. In cases with RI < 0.48, more than two thirds of the patients had a pleural effusion, whereas patients with either PI < 0.75 or S-D < 1.92 had pleural effusion in over one half of the cases. It was notable that blood flow velocity did not differ significantly between the two groups despite the changes in vascular impedance.
  
  
  CONCLUSIONS
  There appears to be a close correlation between the severity of OHSS and the resistance to blood flow within the stimulated ovaries. Measurement of intraovarian vascular resistance before gamete transfer or ET in patients undergoing controlled ovarian hyperstimulation may help in predicting those patients at particular risk of developing severe OHSS.
authors.affiliation: Department of Obstetrics and Gynaecology, Monash Medical Centre, Clayton, Victoria, Australia.
authors.forename: J M
authors.initials: JM
authors.lastname: Moohan
authors.forename: K
authors.initials: K
authors.lastname: Curcio
authors.forename: M
authors.initials: M
authors.lastname: Leoni
authors.forename: D
authors.initials: D
authors.lastname: Healy
authors.forename: V
authors.initials: V
authors.lastname: Hurley
mesh_terms: D000328:Adult; D015415:Biomarkers; D001783:Blood Flow Velocity / Q000502:physiology; D015331:Cohort Studies; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D016471:Ovarian Hyperstimulation Syndrome / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000517:prevention & control; D010053:Ovary / Q000098:blood supply* / Q000000981:diagnostic imaging; D011446:Prospective Studies; D012039:Regional Blood Flow / Q000502:physiology; D018617:Ultrasonography, Doppler, Pulsed; D014655:Vascular Resistance / Q000502:physiology*
chemical_list: D015415:Biomarkers