title: Gonadotropin-releasing hormone agonist-induced hypoestrogenism and blood flows in cerebral arteries.
abstract: OBJECTIVE
  To evaluate the effect of the hypoestrogenism induced by GnRH agonist (GNRH-a) therapy on cerebral vessel blood flow.
  
  
  METHODS
  Open, controlled study.
  
  
  METHODS
  Tertiary care units of the University of Milan, Italy.
  
  
  METHODS
  Young women scheduled to undergo 6 months of therapy with a GnRH-a; a control group was also enrolled.
  
  
  METHODS
  In both groups, the pulsatility index of both the internal carotid artery (ICA) and middle cerebral artery (MCA) was measured by means of Doppler ultrasound over a period of 6 months.
  
  
  METHODS
  The ICA and MCA pulsatility index.
  
  
  RESULTS
  No variation in the pulsatility index of either artery was found in either group.
  
  
  CONCLUSIONS
  A 6-month period of GnRH-a-induced hypoestrogenism in young women does not lead to any variation in the blood flow of cerebral vessels. This provides some reassurance as to the safety of these drugs in relation to the role that the reactivity of peripheral arteries may play in determining risk of cardiovascular disease. Furthermore, our results show that blood flow in the cerebral vessels of young subjects is under extraestrogenic control and that this may counterbalance estrogen deprivation through mechanisms that probably are no longer active in the perimenopausal years.
authors.affiliation: Istituti Clinici di Perfezionamento, University of Milan, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Penotti
authors.forename: M
authors.initials: M
authors.lastname: Farina
authors.forename: L
authors.initials: L
authors.lastname: Gabrielli
authors.forename: L
authors.initials: L
authors.lastname: Miglierina
authors.forename: A M
authors.initials: AM
authors.lastname: Miragoli
authors.forename: M
authors.initials: M
authors.lastname: Vignali
mesh_terms: D000328:Adult; D002343:Carotid Artery, Internal / Q000187:drug effects* / Q000502:physiology; D002536:Cerebral Arteries / Q000187:drug effects / Q000502:physiology*; D004967:Estrogens / Q000097:blood*; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists* / Q000494:pharmacology; D006801:Humans; D012039:Regional Blood Flow / Q000187:drug effects; D017329:Triptorelin Pamoate / Q000494:pharmacology*
chemical_list: D004967:Estrogens; D017329:Triptorelin Pamoate; D007987:Gonadotropin-Releasing Hormone