Respiratory Heart Rate Variability in Fetal and Neonatal Lambs
Respiratory heart rate variability (respiratory sinus arrhythmia, RSA) is a well-known phenomenon in adults, but its contribution to total heart rate variability (HRV) is small in newborn babies . Fetal HRV is known to increase during fetal breathing movements (FBM) [2, 3], which is thought to be due to RSA. At present there is fairly little frequency-specific information on the relationship between fetal HRV and FBM. In this study we investigated the magnitude of respiratory HRV in chronic fetal and neonatal lamb models using power spectral analysis of heart rate and respirograms.
KeywordsHeart Rate Variability Respiratory Sinus Arrhythmia Fetal Lamb Tracheal Pressure BMDP Statistical Software
Unable to display preview. Download preview PDF.
- 4.Siimes ASI (1977) Maternal and fetal cardiovascular and metabolic responses to beta adrenergic stimulation. An experimental study in pregnant sheep (Thesis). University of Helsinki, HelsinkiGoogle Scholar
- 5.Jenkins GM, Watts DG (1969) Spectral analysis and its applications. Holden-Day, San FranciscoGoogle Scholar
- 6.Välimäki I, Grönlund J, Rolfe P (1990) Compromised cerebral circulation in preterm neonates after intraventricular haemorrhage — cerebral electrical impedance approach. In: Hawkins G, DiRenzo E (eds.) Progress in perinatal medicine, Harwood Academic Publishers, Singapore, pp 141–153Google Scholar
- 7.Dixon W (1985) BMDP statistical software manual. University of California Press, Berkeley, pp 413–426Google Scholar
- 10.Siimes ASI, Välimäki IAT, Oja RT, Antila KJ (1986) Detection of components of autonomic cardiac control by time series analysis of heart rate in lambs: technical report. In: Rolfe P (ed) Fetal physiological measurements. Butterworths, London, pp 259–266Google Scholar
- 12.Joels N, Samueloff N (1971) The activity of the medullary centers in diffusion registration. J Physiol (Lond) 133: 360–372Google Scholar