OBJECTIVE: We attempted to determine the relationship between the fetal heart rate power spectrum and fetal state. STUDY DESIGN: Interbeat intervals, electrocortical activity, and fetal breathing movements were recorded from five near-term fetal lambs. Interbeat intervals were taken from epochs of low-voltage electrocortical activity with breathing, low-voltage electrocortical activity without breathing, and high-voltage electrocortical activity without breathing. Power spectral techniques were applied to determine the underlying frequencies contributing to fetal heart rate variability. Spectral analysis was also performed on fetal breathing data from three animals. RESULTS: Significant differences were found between low-voltage electrocortical activity with breathing and high-voltage electrocortical activity without breathing at 0.62 Hz and from 1.09 to 1.56 Hz. There was no clear relationship between the breathing and heart rate spectra. CONCLUSIONS: Fetal heart rate is mediated by both state and respiratory variables. The respiratory component is not strictly related to respiratory rate.
OBJECTIVE: We attempted to determine the relationship between the fetal heart rate power spectrum and fetal state. STUDY DESIGN: Interbeat intervals, electrocortical activity, and fetal breathing movements were recorded from five near-term fetal lambs. Interbeat intervals were taken from epochs of low-voltage electrocortical activity with breathing, low-voltage electrocortical activity without breathing, and high-voltage electrocortical activity without breathing. Power spectral techniques were applied to determine the underlying frequencies contributing to fetal heart rate variability. Spectral analysis was also performed on fetal breathing data from three animals. RESULTS: Significant differences were found between low-voltage electrocortical activity with breathing and high-voltage electrocortical activity without breathing at 0.62 Hz and from 1.09 to 1.56 Hz. There was no clear relationship between the breathing and heart rate spectra. CONCLUSIONS: Fetal heart rate is mediated by both state and respiratory variables. The respiratory component is not strictly related to respiratory rate.
Authors: Umit D Ulusar; R B Govindan; James D Wilson; Curtis L Lowery; Hubert Preissl; Hari Eswaran Journal: Conf Proc IEEE Eng Med Biol Soc Date: 2009
Authors: James D Wilson; R B Govindan; Jeff O Hatton; Curtis L Lowery; Hubert Preissl Journal: IEEE Trans Biomed Eng Date: 2008-09 Impact factor: 4.538
Authors: Pavel Dietz; Estelle D Watson; Matteo C Sattler; Wolfgang Ruf; Sylvia Titze; Mireille van Poppel Journal: BMC Pregnancy Childbirth Date: 2016-10-26 Impact factor: 3.007