Telefetalcare: A first prototype of a wearable fetal electrocardiograph

Fetal heart rate monitoring is fundamental to infer information about fetal health state during pregnancy. The cardiotocography (CTG) is the most common antepartum monitoring technique. Abdominal ECG recording represents the most valuable alternative to cardiotocography, as it allows passive, non invasive and long term fetal monitoring. Unluckily fetal ECG has low SNR and needs to be extracted from abdominal recordings using ad hoc algorithms. This work describes a prototype of a wearable fetal ECG electrocardiograph. The system has flat band frequency response between 1–60Hz and guarantees good signal quality. It was tested on pregnant women between the 30th and 34th gestational week. Several electrodes configurations were tested, in order to identify the best solution. Implementation of a simple algorithm for FECG extraction permitted the reliable detection of maternal and fetal QRS complexes. The system will allow continuative and deep screening of fetal heart rate, introducing the possibility of home fetal monitoring.

[1]  E Bacharakis,et al.  Maternal and foetal ECG separation using blind source separation methods. , 1997, IMA journal of mathematics applied in medicine and biology.

[2]  D. Fotiadis,et al.  Fetal heart rate extraction from composite maternal ECG using complex continuous wavelet transform , 2004, Computers in Cardiology, 2004.

[3]  Joos Vandewalle,et al.  Fetal electrocardiogram extraction by blind source subspace separation , 2000, IEEE Transactions on Biomedical Engineering.

[4]  Massimo Mischi,et al.  A robust fetal ECG detection method for abdominal recordings , 2007, Physiological measurement.

[5]  Giuseppe Andreoni,et al.  Prototype of a wearable system for remote fetal monitoring during pregnancy , 2010, 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology.

[6]  R. Vullings,et al.  Heart Rate Detection in Low Amplitude Non-Invasive Fetal ECG Recordings , 2006, 2006 International Conference of the IEEE Engineering in Medicine and Biology Society.

[7]  B. Widrow,et al.  Adaptive noise cancelling: Principles and applications , 1975 .

[8]  G. Magenes,et al.  Estimation of long-term correlations from Fetal Heart Rate variability signal for the identification of pathological fetuses , 2007, 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[9]  G. Clifford,et al.  A Review of Fetal ECG Signal Processing; Issues and Promising Directions. , 2010, The open pacing, electrophysiology & therapy journal.

[10]  MA Hasan,et al.  Detection and Processing Techniques of FECG Signal for Fetal Monitoring , 2009, Biological Procedures Online.

[11]  S. Cerutti,et al.  Variability analysis of fetal heart rate signals as obtained from abdominal electrocardiographic recordings , 1986, Journal of perinatal medicine.