In this paper we discussed the influence of preliminary processing of the ultrasound Doppler signal on accuracy of the fetal heart rate estimation as well as on reliability of the FHR instantaneous variability assessment. We attempted to develop an optimal processing channel of US Doppler signal in order to measure the periodicity of fetal heart activity with accuracy as close as possible to th...

Fetal heart rate (fHR) is used to evaluate the fetal well-being during the delivery. It provides information of fetal status and allows doctors to detect ongoing hypoxia. The routine clinical evaluation of intrapartal fHR is based on description of macroscopic morphological features of its baseline. In this paper we will show that using additional features for description of the fHR recordings ...

Although cardiotocography (CTG) is the most commonly used method in perinatal monitoring. there are still some difficulties surrounding its interpretation. In many cases an unequivocal diagnosis is not possible without additional physiological information. The reasons may be either physiological or due to shortcomings of existing instrumentation. A typical example is shown in Figure 1, where th...

Galinsky R, Lear CA, Yamaguchi K, Wassink G, Westgate JA, Bennet L, Gunn AJ. Cholinergic and -adrenergic control of cardiovascular reflex responses to brief repeated asphyxia in termequivalent fetal sheep. Am J Physiol Regul Integr Comp Physiol 311: R949–R956, 2016. First published September 16, 2016; doi:10.1152/ ajpregu.00340.2016.—The role of cholinergic and -adrenergic activity in mediating...

BACKGROUND Fetal long QT syndrome (LQTS) is associated with complex arrhythmias including torsades de pointes and 2° atrioventricular block. Sinus bradycardia has also been associated with fetal LQTS, but little is known of this rhythm manifestation. Our purpose was to characterize the fetal heart rate (FHR)/gestational age (GA) profile of fetal LQTS. METHODS AND RESULTS We ascertained fetal ...

One new approach for the problem of feature extraction and classification of Fetal Heart Rate signal is introduced in this paper. It considers the use of the Discrete Wavelet Transformation to extract scale-dependent features of Fetal Heart Rate (FHR) signal and the use of Support Vector Machines for classification of FHR. The proposed methodology is tested on real data acquired just before del...

A PIC17C44 microcontroller development board and a real-time algorithm were developed with the capability of monitoring the fetal heart rate (FHR) as well as recording both the FHR and maternal heart rate for long-term. This paper describes the development of the microcontroller board and implementation of a real-time algorithm which were used to develop the portable recorder. Two set-up were d...

Commonly used noninvasive fetal monitoring is based on fetal heart rate (FHR) variability analysis of the Doppler ultrasound signal coming from the mechanical activity of the fetal heart. Estimation of periodicity of acquired signals using the autocorrelation technique is very important. The determination of cardiac intervals using the Doppler signal is more difficult than in electrocardiograph...

Aims: This study aimed to simplify fetal monitoring, reduce inter-observer differences and false-positive diagnosis and monitor a large number of births simultaneously. Methods: Fetal signals from several births were transmitted to a central computer via local area network (LAN) or telemetry and analyzed using a multichannel timesharing system. Fetal heart rate (FHR) abnormalities were detected...