title: Effect of antenatal corticosteroid administration on Doppler flow velocity parameters in pregnancies with absent or reverse end-diastolic flow in the umbilical artery.
abstract: OBJECTIVE
  Evaluation of alterations of Doppler flow velocity waveforms after antenatal corticosteroid therapy.
  
  
  METHODS
  Pulsatility index of the umbilical artery, middle cerebral artery and ductus venosus waveforms was measured in high-risk pregnancies complicated by umbilical AREDV directly prior to and within 24 or 48 hours after application of the first dose of a steroid treatment course.
  
  
  RESULTS
  Return of a positive end-diastolic flow after umbilical AREDV or conversion of REDV into zero-flow was detected in 9 of 20 (45%) pregnancies after steroid application. Neither in the group which showed altered umbilical end-diastolic flow nor in the total of patients investigated was there any significant change in the PI of the umbilical artery or the ductus venosus waveforms. In contrast, there was an overall drop of pulsatility in the middle cerebral artery.
  
  
  CONCLUSIONS
  Antenatal corticosteroid administration could increase cerebral perfusion but has no influence on umbilical and venous blood flow.
authors.affiliation: Department of Obstetrics and Gynecology, University of Würzburg, Würzburg, Germany. t.muellerdog@gmx.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Müller
authors.forename: Ralph
authors.initials: R
authors.lastname: Nanan
authors.forename: Johannes
authors.initials: J
authors.lastname: Dietl
mesh_terms: D000305:Adrenal Cortex Hormones / Q000008:administration & dosage / Q000494:pharmacology*; D000328:Adult; D001623:Betamethasone / Q000008:administration & dosage / Q000494:pharmacology; D001783:Blood Flow Velocity / Q000187:drug effects*; D003907:Dexamethasone / Q000008:administration & dosage / Q000494:pharmacology; D005260:Female; D005318:Fetal Heart / Q000187:drug effects / Q000502:physiology; D005333:Fetus / Q000098:blood supply*; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008499:Medical Records; D020768:Middle Cerebral Artery / Q000187:drug effects / Q000502:physiology; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D018566:Pregnancy, High-Risk / Q000502:physiology*; D011673:Pulsatile Flow / Q000187:drug effects*; D012189:Retrospective Studies; D014469:Umbilical Arteries / Q000187:drug effects / Q000502:physiology
chemical_list: D000305:Adrenal Cortex Hormones; D003907:Dexamethasone; D001623:Betamethasone