Key result
Hilbert phase slips improve electrohysterogram accuracy and correlation with intrauterine pressure signals over prior methods.
Why the study?
Tocodynamometry has low sensitivity and intrauterine pressure catheter is invasive, motivating development of a noninvasive, accurate method to estimate intrauterine pressure from electrohysterography.
Answers are grounded in this paper and cite their sources.
Prognostic information during pregnancy can be obtained by monitoring maternal uterine activity. Tocodynamometry (TOCO) is widely used to assess the uterine activity today but it has been found that it has very low sensitivity. Another method to assess the uterine activity is intrauterine pressure catheter (IUPC) which is accurate but highly invasive. Electrohysterogram (EHG) measured from abdominal surface is a noninvasive method to detect uterine contractions. To reduce motion artifacts of intrauterine pressure (IUP) estimated from EHG signal and further improve the accuracy of contractions detected by IUP estimation, we propose a method to divide the EHG signal into segments by using Hilbert phase slips. Standard deviation (STD) was used to estimate IUP from each EHG signal segment and median filter was used to remove the motion artifacts. The method we proposed was compared with other four methods from literatures. The proposed method results in a higher contractions detection accuracy of EHG-based IUP estimation and a higher correlation coefficient with the IUPC signals compared to other methods which demonstrated the capabilities of the proposed method in reducing motion artifacts of IUP estimation based on abdominal EHG.
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Yang et al. (2017) studied Pregnancy / Uterine contractions. Estimation of IUP from EHG using Hilbert phase slips and standard deviation vs. Four other methods from the literature was evaluated on Contractions detection accuracy and correlation coefficient with IUPC signals. A proposed method using Hilbert phase slips to estimate intrauterine pressure from electrohysterograms demonstrated higher contraction detection accuracy and correlation with IUPC signals than prior methods.
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