title: Change of Spectral Analysis of Fetal Heart Rate During Clinical Hypnosis: a Prospective Randomised Trial from the 20th Week of Gestation Till Term.
abstract: Objective:To investigate the functional adaptive process of the fetal autonomic nervous system during hypnosis from the 20th week of gestation till term. Are there changes in the power spectrum analysis of fetal heart rate when the mother is having a clinical hypnosis or control period?Study Design:Fourty-nine FHR recordings were analysed. Included recordings were from singletons and abdominal fetal ECG-monitored pregnancies. All women were randomised to receive clinical hypnosis followed by a period with no intervention or vice versa. Statistical analyses were performed with the Wilcoxon signed ranks and Spearman rho correlation tests.Results:There was a significant difference found between fetal heart rate at baseline (144.3 ± 6.0) and hypnosis (142.1 ± 6.4). A difference was also detected between the standard deviation of the heart rate between baseline (6.7 ± 1.9) and hypnosis (6.8 ± 3.5). LFnu was smaller during baseline (80.2 ± 5.3) than during hypnosis (82.1 ± 5.7), whereas HFnu was significantly larger (19.8 ± 5.3 vs. 17.9 ± 5.7). There was no correlation between the gestation age and the change in LFnu, HFnu or ratio LF/HF due to the hypnosis intervention.Conclusion:The functional adaptive process of the fetal autonomic system during hypnosis is reflected by a sympathovagal shift towards increased sympathetic modulation.
authors.affiliation: Obstetrics and Gynaecology Department, Johann Wolfgang Goethe University Frankfurt, Frankfurt.
authors.forename: J
authors.initials: J
authors.lastname: Reinhard
authors.affiliation: School of Electrical and Electronic Engineering, University of Nottingham, Nottingham, United Kingdom.
authors.forename: B R
authors.initials: BR
authors.lastname: Hayes-Gill
authors.affiliation: Obstetrics and Gynaecology, Teaching Hospital of the Ruhr-University Bochum, Witten.
authors.forename: S
authors.initials: S
authors.lastname: Schiermeier
authors.affiliation: Obstetrics and Gynaecology, Teaching Hospital of the Ruhr-University Bochum, Witten.
authors.forename: W
authors.initials: W
authors.lastname: Hatzmann
authors.affiliation: Obstetrics and Gynaecology Department, Johann Wolfgang Goethe University Frankfurt, Frankfurt.
authors.forename: T M
authors.initials: TM
authors.lastname: Heinrich
authors.affiliation: Deutsche Gesellschaft für Hypnose und Hypnotherapie, German Society for Clinical Hypnosis, Coesfeld.
authors.forename: H
authors.initials: H
authors.lastname: Hüsken-Janßen
authors.affiliation: Department of Biostatistics and Mathematical Models, Johann Wolfgang Goethe University Frankfurt am Main, Frankfurt.
authors.forename: E
authors.initials: E
authors.lastname: Herrmann
authors.affiliation: Obstetrics and Gynaecology Department, Johann Wolfgang Goethe University Frankfurt, Frankfurt.
authors.forename: F
authors.initials: F
authors.lastname: Louwen
keywords: Fetal heart monitoring; clinical hypnosis; frequency analysis; heart rate variability; spectral analysis