Analysis of fetal heart rate asymmetry before and after 35 weeks of gestation

Karmakar, Chandan; Kimura, Yoshitaka; Palaniswami, Marimuthu; Khandoker, Ahsan H.

doi:10.1016/j.bspc.2015.05.010

Cited by 14 publications

(11 citation statements)

References 56 publications

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“…However, significant relationship between PI and gestation age was observed. Authors conclude that development of autonomic nervous system leads to higher fetal HRA and that gestation age is stronger related to asymmetricities of number of accelerations/decelerations in comparison to its magnitude (Karmakar et al, 2015b). Sample asymmetry analysis was shown do detect abnormal heart rate characteristics that occurred before sepsis and systemic inflammatory response syndrome development in neonatal sample (Kovatchev et al, 2003).…”

Section: Discussionmentioning

confidence: 94%

Heart Rate Asymmetry Analysis During Head-Up Tilt Test in Healthy Men

et al. 2021

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The purpose of this study is to assess the cardiovascular system response to orthostatic stress in a group of 133 healthy men using heart rate asymmetry (HRA) methods. HRA is a feature of variability in human heart rate which is dependent upon external and internal body conditions. The initial phases of head-up tilt test (HUTT), namely, supine and tilt, were chosen as the external body affecting factors. Various calculation methods of HRA, such as Porta’s index (PI), Guzik’s index (GI), and its variance based components, were used to assess the heart rate variability (HRV) and its asymmetry. We compared 5-min ECG recordings from both supine and tilt phases of HUT test. Short-term HRA was observed in 54.1% of men in supine phase and 65.4% of men in tilt phase. The study revealed significant increase of GI (from 0.50 to 0.52, p < 0.001) in the tilt phase as well as significant changes in HRV descriptors between HUTT phases. Our results showed that the variability of human heart rate and its asymmetry are sensitive to orthostatic stress. The study of short-term HRA is a potential additional tool to increase sensitivity in conditions where HUTT is a diagnostic tool, such as vasovagal syncope.

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Section: Discussionmentioning

confidence: 94%

Heart Rate Asymmetry Analysis During Head-Up Tilt Test in Healthy Men

et al. 2021

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“…We suppose that fatigue due to the physical effort of the fetus may be reflected in the FBM [ 27 ]. For this purpose, the total length of the measured episodes, called dSP (the distance of two neighboring SPs, including the distance of the minimum zone) has been determined as the function of the gestational age.…”

Section: Resultsmentioning

confidence: 99%

Novel Phonography-Based Measurement for Fetal Breathing Movement in the Third Trimester

Goda

Telek²,

Kovács

2020

Sensors

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The detailed assessment of fetal breathing movement (FBM) monitoring can be a pre-indicator of many critical cases in the third trimester of pregnancy. Standard 3D ultrasound monitoring is time-consuming for FBM detection. Therefore, this type of measurement is not common. The main goal of this research is to provide a comprehensive image about FBMs, which can also have potential for application in telemedicine. Fifty pregnancies were examined by phonography, and nearly 9000 FBMs were identified. In the case of male and female fetuses, 4740 and 3100 FBM episodes were detected, respectively. The measurements proved that FBMs are well detectable in the 20–30 Hz frequency band. For these episodes, an average duration of 1.008 ± 0.13 s (p < 0.03) was measured in the third trimester. The recorded material lasted for 16 h altogether. Based on these measurements, an accurate assessment of FBMs could be performed. The epochs can be divided into smaller-episode groups separated by shorter breaks. During the pregnancy, the rate of these breaks continuously decreases, and episode groups become more contiguous. However, there are significant differences between male and female fetuses. The proportion of the episodes which were classified into minimally 10-member episode groups was 19.7% for males and only 12.1% for females, even at the end of the third trimester. In terms of FBM detection, phonography offers a novel opportunity for long-term monitoring. Combined with cardiac diagnostic methods, it can be used for fetal activity assessment in the third trimester and make measurement appreciably easier than before.

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“…HRA observed from Poincaré plot represents the presence of complex dynamics in physiological signal. There were several effective measures established to assess HRA [13]. In this part, we introduced the definitions of HRA variables and the basic descriptors used in this study.…”

Section: Heart Rate Asymmetrymentioning

confidence: 99%

The effect of passive lower limb training on heart rate asymmetry

Shi

et al. 2020

Preprint

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Background: Heart rate asymmetry (HRA) is an approach for quantitatively assessing the uneven distribution points of RR intervals of sinus rhythm. We aimed to investigate whether the automatic regulation lead to HRA alternation during passive lower limb training. Methods : Several variance-based HRA variables derived from Poincaré plot were established. Thirty healthy participants were recruited in this study. The protocol included baseline (Pre-E) and three passive lower limb training trials (E1, E2 and E3) with a randomized order. Heart rate variability (HRV) frequency-domain parameters (LF (n.u.), HF (n.u.) and VLF (ms 2 )) and HRA variables (SD1a, SD1d, SD2a, SD2d, SDNNa and SDNNd) were calculated by using 5-min RR time series. Results : Our results showed that the performance of HRA distinguished. The HRA was observed with significant changes in E1, E2 and E3 compared to Pre -E. Moreover, HRA variables correlated with HRV parameters in all trials, which indicated that HRA might benefit in assessing autonomic alteration in passive lower limb trainings. Conclusions: In summary, this study suggested that passive training led to significant HRA alternation and the application of HRA gave us the possibility for autonomic assessment.

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Analysis of fetal heart rate asymmetry before and after 35 weeks of gestation

Cited by 14 publications

References 56 publications

Heart Rate Asymmetry Analysis During Head-Up Tilt Test in Healthy Men

Heart Rate Asymmetry Analysis During Head-Up Tilt Test in Healthy Men

Novel Phonography-Based Measurement for Fetal Breathing Movement in the Third Trimester

The effect of passive lower limb training on heart rate asymmetry

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