Analysis and Classification of Three Trimesters during Normal Pregnancy Using Bispectrum

Veerabhadrappa, S. T.; Vyas, Anoop Lal

doi:10.1080/03772063.2020.1725658

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…Chua et al have analyzed cardiac arrhythmias using bispectrum invariant features and phase entropies obtained from cardiac tachograms [10]. HRV bispectrum has been proposed for the classification of maternal status during healthy pregnancy and postpartum [17], for diabetes detection [18] as well as for exploring cardiovascular changes related to heart transplant [19].…”

Section: Introductionmentioning

confidence: 99%

Introducing BisQ, A Bicoherence-Based Nonlinear Index to Explore the Heart Rhythm

Hernández-Caceres

González-Fernández

Ontivero-Ortega

et al. 2020

MCA

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Nonlinear frequency coupling is assessed with bispectral measures, such as bicoherence. In this study, BisQ, a new bicoherence-derived index, is proposed for assessing nonlinear processes in cardiac regulation. To find BisQ, 110 ten-minute ECG traces obtained from 55 participants were initially studied. Via bispectral analysis, a bicoherence matrix (BC) was obtained from each trace (0.06 to 1.8 Hz with a resolution of 0.01 Hz). Each frequency pair in BC was tested for correlation with the HRV recurrent quantification analysis (RQA) index Lmean, obtained from tachograms from the same ECG trace. BisQ is the result of adding BC values corresponding to the three frequency pairs exhibiting the highest correlation with Lmean. BisQ values were estimated for different groups of subjects: healthy persons, persons with arrhythmia, persons with epilepsy, and preterm neonates. ECG traces from persons with arrhythmia showed no significant differences in BisQ values respect to healthy persons, while persons with epilepsy and neonates showed higher BisQ values (p < 0.05; Mann-Whitney U-test). BisQ reflects nonlinear interactions at the level of sinus-and atrial-ventricular nodes, and most likely cardiorespiratory coupling as well. We expect that BisQ will allow for further exploration of cardiac nonlinear dynamics, complementing available HRV indices.

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