title: Neonatal magnetocardiography and Fourier spectral analysis.
abstract: OBJECTIVE
  In this study we investigated the relationship between heart rate variability (HRV) and respiration in healthy and probably asphyxiated infants using magnetocardiographic (MCG) recordings.
  
  
  METHODS
  Ten healthy and eight infants from pregnancies complicated by preeclampsia with indications of mild perinatal asphyxia were included in the study. All were near term. Maternal age ranged from 16 to 39 years (mean = 29.05, SD = 6.13). Spectral analysis was used to find out any association between respiration and HRV.
  
  
  RESULTS
  Respiratory sinus arrhythmia (RSA) was reduced in preeclamptic infants with indications of mild perinatal asphyxia. This difference was statistically significant (p < 0.0002, t-test), whereas the heart rate of the two groups was not statistically significant (p = 0.1, t-test).
  
  
  CONCLUSIONS
  The results suggest that infants with indications of mild preeclampsia differ from controls in respiratory activity and this difference is independent of basal heart rate. Thus, spectral analysis could be useful for the estimation of influence of mild perinatal asphyxia in the RSA rhythm of newborns.
authors.affiliation: Laboratory of Medical Physics, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
authors.forename: P
authors.initials: P
authors.lastname: Anninos
authors.forename: P G
authors.initials: PG
authors.lastname: Anastasiadis
authors.forename: A
authors.initials: A
authors.lastname: Kotini
authors.lastname: Lecturer
authors.forename: N
authors.initials: N
authors.lastname: Koutlaki
authors.forename: A
authors.initials: A
authors.lastname: Garas
authors.forename: G
authors.initials: G
authors.lastname: Galazios
mesh_terms: D001238:Asphyxia Neonatorum / Q000503:physiopathology*; D015148:Cardiotocography; D005260:Female; D005583:Fourier Analysis; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D008280:Magnetics; D008297:Male; D012119:Respiration