title: Middle cerebral artery blood velocity during controlled ovarian hyperstimulation.
abstract: OBJECTIVE
  To measure cerebral blood flow velocities using transcranial Doppler during ovulation induction after pituitary suppression.
  
  
  METHODS
  Women undergoing controlled ovarian hyperstimulation after pituitary suppression were prospectively studied.
  
  
  METHODS
  Tertiary institution.
  
  
  METHODS
  A microprocessor-controlled directional pulsed-wave adjustable hand held probe (2 MHz) was used to measure blood flow velocities and pulsatility indices in the right and left middle cerebral arteries (middle cerebral artery) in nine patients. Measurements of peak middle cerebral artery velocities (cm/s) and pulsatility index were obtained after achieving pituitary suppression with leuprolide acetate and repeated over several days after treatment with human menopausal gonadotropin (225 IU/d).
  
  
  RESULTS
  There was a significant increase in the peak middle cerebral artery velocities (cm/s) of the patients measured at the time of pituitary suppression when compared with those obtained at the time of maximal estradiol (E2) (98 +/- 12 versus 105 +/- 12, P less than 0.03). The pulsatility index also showed a significant increase from 0.72 +/- 0.08 at the time of pituitary suppression to 0.82 +/- 0.04 at the time of maximal hyperestrogenism, P less than 0.002. Estradiol values obtained at the time of the transcranial Doppler examinations were normalized by transformation to their natural logarithms (LnE2). The middle cerebral artery velocities were significantly correlated with LnE2 levels (P less than 0.0001 and r = 0.93).
  
  
  CONCLUSIONS
  Estrogen levels appear to be directly correlated with cerebral blood flow velocity and pulsatility index, implying an effect of ovarian steroids on cerebrovascular hemodynamics.
authors.affiliation: Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut 06510.
authors.forename: F N
authors.initials: FN
authors.lastname: Shamma
authors.forename: P
authors.initials: P
authors.lastname: Fayad
authors.forename: L
authors.initials: L
authors.lastname: Brass
authors.forename: P
authors.initials: P
authors.lastname: Sarrel
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001783:Blood Flow Velocity; D002536:Cerebral Arteries / Q000000981:diagnostic imaging / Q000502:physiology*; D004958:Estradiol / Q000097:blood; D005260:Female; D006801:Humans; D008596:Menotropins / Q000627:therapeutic use*; D010053:Ovary / Q000502:physiology*; D011374:Progesterone / Q000097:blood; D011674:Pulse; D013268:Stimulation, Chemical; D014463:Ultrasonography
chemical_list: D011374:Progesterone; D004958:Estradiol; D008596:Menotropins