Scattering Transform for Intrapartum Fetal Heart Rate Variability Fractal Analysis: A Case-Control Study

Vaclav Chudacek, Joakim Anden, Stephane Mallat, Patrice Abry, Muriel Doret
2014 IEEE Transactions on Biomedical Engineering  
Intrapartum fetal heart rate monitoring, aiming at early acidosis detection, constitutes an important public health stake. Scattering Transform is proposed here as a new tool to analyze intrapartum fetal heart rate variability. It consists of a non linear extension of the underlying Wavelet Transform, that thus preserves its multiscale nature. Applied to a Fetal Heart Rate (FHR) signal database constructed in a French academic hospital, the Scattering Transform is shown to permit to efficiently
more » ... measure scaling exponents characterizing the fractal properties of intrapartum fetal heart rate temporal dynamics, that relate not only to the sole covariance (correlation scaling exponent) but also to the full dependence structure of data (intermittency scaling exponent). Such exponents are found to satisfactorily discriminate temporal dynamics of Healthy subjects (from that of Non Healthy ones) and to emphasize the role of the highest frequencies (around and above 1Hz) in intrapartum fetal heart rate variability. This permits to achieve satisfactory classification performance, that improves on those obtained from the analysis of International Federation of Gynecology and Obstetrics (FIGO) criteria, notably by classifying as Healthy a number of subjects that were incorrectly classified as Non Healthy by classical clinically-used FIGO criteria. Combined to obstetrician annotations, these scaling exponents enables us to sketch a typology of these FIGO-False Positive subjects. Also, they permit to monitor the evolution along time of the intrapartum health status of the fetuses and to estimate an optimal detection time-frame.
doi:10.1109/tbme.2013.2294324 pmid:24658235 fatcat:npw2xfm5wbhv7l2qrin6cskpoi