Abstract
Characterizing fetal wellbeing with a Doppler ultrasound device requires computation of a score based on fetal parameters. In order to analyze the parameters derived from the fetal heart rate correctly, an accuracy of 0.25 beats per minute is needed. Simultaneously with the lowest false negative rate and the highest sensitivity, we investigated whether various Doppler techniques ensure this accuracy. We found that the accuracy was ensured if directional Doppler signals and autocorrelation estimation were used. Our best estimator provided sensitivity of 95.5%, corresponding to an improvement of 14% compared to the standard estimator.
Highlights
Continuous monitoring of fetal parameters has shown their advantages in estimating fetal wellbeing [ ]
We evaluated the e cacy of all these techniques empirically
We sought con gurations that ensured an error of estimation, that is, the expected accuracy below . bpm, the highest sensitivity, and the lowest false negative rate
Summary
Continuous monitoring of fetal parameters has shown their advantages in estimating fetal wellbeing [ ]. Is parameter, which corresponds to the variation between intervals of two consecutive heart beats, is an indicator of central nervous system development [ – ]. One important parameter in assessing fetal wellbeing is the variability of the fetal heart rate. It characterizes fetal behavior states [ – ] and can be an indicator of further neurological evolution [ ]. In the normal fetal heart rate range ( – bpm), a time variability of ms corresponds to a cardiac frequency variability of . Bpm in order to analyze fetal heart rate variability correctly. Reliable estimation of fetal heart rate and of heart rate variability is essential
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