title: Fetal heart rate and umbilical artery flow velocity variability in intrauterine growth restriction: a matched controlled study.
abstract: OBJECTIVE
  To study heart rate and umbilical artery blood flow velocity variability in growth-restricted fetuses and investigate the influence of the autonomic nervous system on these parameters.
  
  
  METHODS
  Doppler velocity waveforms were collected from long-lasting umbilical artery recordings in 15 fetuses with growth restriction and 15 normal age-matched controls at 23-35 weeks of gestation. Absolute heart rate and umbilical artery blood flow velocity as well as the coefficient of variation were determined. Using power spectral analysis the low- and high-frequency bands of heart rate variability and blood flow velocity variability were calculated. The low-to-high (LH) ratio of heart rate variability and blood flow velocity variability were examined as a measure of sympathovagal balance.
  
  
  RESULTS
  In growth-restricted fetuses umbilical artery velocities were significantly reduced. Heart rate variability was significantly reduced in the presence of growth restriction, but no significant difference was demonstrated for blood flow velocity variability. The LH ratio for heart rate variability was significantly decreased in growth restriction, but no difference in LH ratio was demonstrated for blood flow velocity variability.
  
  
  CONCLUSIONS
  Flow velocity variability in growth restriction seems not to be predominantly influenced by the autonomic nervous system, whereas the decreased heart rate variability seems to be influenced by altered sympathetic-parasympathetic balance.
authors.affiliation: Department of Obstetrics and Gynaecology, Erasmus Medical Centre, Rotterdam, The Netherlands.
authors.forename: A S M
authors.initials: AS
authors.lastname: Vinkesteijn
authors.forename: P C
authors.initials: PC
authors.lastname: Struijk
authors.forename: N T C
authors.initials: NT
authors.lastname: Ursem
authors.forename: W C J
authors.initials: WC
authors.lastname: Hop
authors.forename: J W
authors.initials: JW
authors.lastname: Wladimiroff
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity; D016022:Case-Control Studies; D005260:Female; D005317:Fetal Growth Retardation / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005865:Gestational Age; D006340:Heart Rate, Fetal; D006801:Humans; D011247:Pregnancy; D012815:Signal Processing, Computer-Assisted; D018709:Statistics, Nonparametric; D018608:Ultrasonography, Doppler; D016216:Ultrasonography, Prenatal; D014469:Umbilical Arteries / Q000000981:diagnostic imaging* / Q000503:physiopathology