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1

Comparison of instantaneous fetal heart rate extracted from abdominal and direct fetal electrocardiograms

Matonia A., Kupka T., Jezewski J., Momot A., Jeżewski M., Bernys M.

Journal of Medical Informatics & Technologies

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2012

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Vol. 19

101--107

EN

This work is an attempt to assess the reliability of indirect abdominal electrocardiography as an alternative technique of fetal monitoring. As a reference signal we used the simultaneously acquired direct fetal electrocardiogram. Each recording consisted of four signals acquired from maternal abdomen and the reference signal acquired directly from fetal head. The first stage of our study concerned the signal loss episodes. In order to reduce the influence of incorrectly detected R-waves, some certain validation rules were applied. In the second stage, the corresponding intervals determined on basis of both acquisition methods were matched and the accuracy of fetal heart rate measurement was evaluated. Although the accuracy of abdominal electrocardiography turned out to be slightly lower than reported for ultrasound method, it still has some unique features deciding of its prevalence in a certain circumstances.

2

Recognition of early symptoms of fetal distress with on-line analysis of bioelectrical signals from maternal abdomen

Gacek A., Matonia A., Jeżewski J., Kupka T.

Biocybernetics and Biomedical Engineering

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2007

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Vol. 27, no. 1-2

207-216

EN

Conventional fetal monitoring for recognition of fetal distress is based on ultrasound Doppler technique. The new approach proposed in this work relies on analysis of bioelectrical signals recorded from the maternal abdominal wall. Fetal electrocardiogram and uterine electrical signal are extracted from abdominal signals using advanced instrumentation and algorithms for signal processing. Evaluation of the fetal heart rate variability with an additional analysis of fetal electrocardiogram morphology is expected to ensure early detection of fetal hypoxia symptoms and, finally, an appropriate obstetrical intervention.

3

Simultaneous recording and analysis of direct and indirect fetal electrocardiography

Matonia A., Jeżewski J., Kupka T., Horoba K., Bernys M.

Journal of Medical Informatics & Technologies

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2004

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Vol. 8

MM111--118

EN

Recording and analysis of fetal heart rate variability is still the most common method for detection of early symptoms of fetal hypoxia. However, fetal heart rate obtained via ultrasound describes only mechanical activity of fetus heart. Limitations of this technique have stimulated the development of fetal electrocardiography. It ensures more precise determination of fetal heart rate and, which is more important, enables assessment of the morphology of the fetal QRS complexes. In this paper two techniques of obtaining the fetal electrocardiogram are described and their comparative study is presented.

4

Antenatal fetal surveillance using bioelectrical signals

Matonia A., Bernyś M., Kupka T., Jeżewski J., Horoba K.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 8-9

110-113

EN

A new approach alternative to cardiotocographic conventional letal monitoring is presented. It relies upon analysis of bioelectrical signals recorded from maternal abdominal wall. Due to strong interferences present in abdominal signal advanced methods of signal processing have been developed to extract letal electrocardiogram and uterine electrical activity signal. The described system allows replacement of more expensive cardiotocographic instrumentation based on ultrasound. Doppler method and ensures the higher diagnostic capacity at the same time.

PL

W pracy przedstawione zostało nowe, alternatywne w stosunku do tradycyjnej kardiotokogralii, podejście do monitorowania stanu płodu w okresie przedporodowym. Zostało ono oparte o rejestrację i analizę biosygnałów rejestrowanych z powierzchni brzucha matki. Występujące w tych sygnałach zakłócenia wymagają stosowania zaawansowanych technik przetwarzania sygnałów w celu wydobycia użytecznej informacji: elektrokardiogramu płodu i sygnału elektrycznej aktywności mięśnia macicy. Opracowany został uniwersalny system do monitorowania płodu pozwalający zastąpić kosztowne aparaty kardiotokograliczne wykorzystujące technikę ultradźwiękową, a zapewniający przy tym znacznie większe możliwości oceny i detekcji stanu zagrożenia płodu.

5

Combined analysis of fetal electrocardiogram and systolic time intervals

Matonia A., Jeżewski J., Kupka T., Horoba K., Wróbel J., Widera M.

Journal of Medical Informatics & Technologies

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2003

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Vol. 6

IT27--34

EN

Cardiotocography as a simultaneous recording of fetal heart rate (FHR) and uterine contraction activity is a basic method of evaluation of fetal condition. Correct variability of the fetal heart rate is an indirect sign of adequate oxygenation of a fetus. Unfortunately, the reverse case is not always true, signs suggesting pathological changes can also appear in recording when the fetal is not at risk. The cardiotocography shall then be recognized as a more screening than diagnostic method. It will be interesting to develop a non-invasive method being complementary to routine cardiotocography. This method should allow the adequate prediction of a bad neonatal outcome when the test is abnormal. The paper shows the system that makes possible cardiotocograms analysis in parallel with the assessment of additional parameters determined from comparison of mechanical and electrical fetal heart activity signals. The studies are aimed at development of set of parameters that are high correlated with clinical outcome.