Nonlinear characteristics of heart rate time series: influence of three recumbent positions in patients with mild or severe coronary artery disease

Kim, Wuon-Shik; Yoon, Younju; Bae, Jang–Ho; Soh, Kwang–Sup

doi:10.1088/0967-3334/26/4/016

Cited by 37 publications

(22 citation statements)

References 35 publications

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“…It has been used to study abnormal heart rate (HR) characteristics of reduced variability in the early course of neonatal sepsis, where it has been shown that SampEn of neonatal HR falls before the clinical diagnosis of sepsis (Lake et al 2002). Moreover, this entropy measure has been applied to characterize the non-linear features of HR time series for three recumbent positions (Kim et al 2005). To our knowledge, this is the first study of the EEG background activity with SampEn.…”

Section: Sample Entropy (Sampen)mentioning

confidence: 99%

Entropy analysis of the EEG background activity in Alzheimer's disease patients

Abásolo¹,

Hornero²,

Espino³

et al. 2006

Physiol. Meas.

303

254

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Alzheimer's disease (AD) is the most common neurodegenerative disorder. Although a definite diagnosis is only possible by necropsy, a differential diagnosis with other types of dementia and with major depression should be attempted. The aim of this study was to analyse the EEG background activity of AD patients to test the hypothesis that the regularity of the AD patients' EEG is higher than that of age-matched controls. We recorded the EEG from 19 scalp electrodes in 11 AD patients and 11 age-matched controls. Two different methods were used to estimate the regularity of the EEG background activity: Spectral entropy (SpecEn) and Sample entropy (SampEn). We did not find significant differences between AD patients and control subjects' EEGs with SpecEn. On the other hand, AD patients had significantly lower SampEn values than control subjects (p < 0.01) at electrodes P3, P4, O1 and O2. Our results show an increase of EEG regularity in AD patients. These findings suggest that non-linear analysis of the EEG with SampEn could yield essential information and may contribute to increase the insight into brain dysfunction in AD in ways which are not possible with more classical and conventional statistical methods.

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Section: Sample Entropy (Sampen)mentioning

confidence: 99%

Entropy analysis of the EEG background activity in Alzheimer's disease patients

Abásolo¹,

Hornero²,

Espino³

et al. 2006

Physiol. Meas.

303

254

View full text Add to dashboard Cite

show abstract

“…Applied to neonatal heart rate recordings, SampEn values fall before clinical signs of sepsis [17]. Kim et al [18] investigated the non-linear characteristics of heart rate variability for different recumbent positions using SampEn.…”

Section: B Sample Entropy (Sampen)mentioning

confidence: 99%

Analysis of MEG recordings from Alzheimer's disease patients with sample and multiscale entropies

Gómez

Hornero

Abásolo

et al. 2007

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-Alzheimer's disease (AD) is one of the most prominent neurodegenerative disorders. The aim of this study is to analyze the magnetoencephalogram (MEG) background activity in AD patients using sample entropy (SampEn) and multiscale entropy (MSE). The former quantifies the signal regularity, while the latter is a complexity measure. These concepts, irregularity and complexity, are linked although the relationship is not straightforward. Five minutes of recording were acquired with a 148-channel whole-head magnetometer in 20 patients with probable AD and 21 control subjects. Our results show that MEG recordings are less complex and more regular in AD patients than in control subjects. Significant differences between both groups were found in some MEG channels with both methods (p < 0.01, Student's t-test with Bonferroni's correction). Using receiver operating characteristic curves, accuracies of 75.6% with SampEn and of 87.8% with MSE were reached. Our findings show the usefulness of these entropy measures to increase our insight into AD.

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“…10 Moreover, patients with chronic heart failure because of CAD prefer the right lateral decubitus position for significantly longer periods of time than either the left lateral decubitus or supine position, because the sympathetic nervous modulation is most attenuated in this position. 11,12 Modern medical research has found that the prone position can improve the arterial oxygen tension in acute lung injury (ALI) and acute respiratory distress syndrome (ARDS), [13][14][15][16][17][18] and is one of the suitable positions used during general or spinal anesthesia.…”

mentioning

confidence: 99%

Comparison of Effect of 5 Recumbent Positions on Autonomic Nervous Modulation in Patients With Coronary Artery Disease

Yang

Chen

Kuo

2008

Circ J

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BackgroundThis study compared the effect of 5 recumbent positions on cardiac autonomic nervous modulation in patients with coronary artery disease (CAD). Methods and ResultsSpectral heart rate variability analysis was performed on 33 CAD patients and 17 patients with patent coronary arteries in random order in 5 positions; namely, supine, right lateral decubitus, left lateral decubitus, left prone and right prone positions. In the right lateral decubitus position, the vagal modulation was the highest and the sympathetic modulation was the lowest among the 5 recumbent positions in the control group. In the CAD patients, the vagal modulation in the supine position was significantly lower than that in the other 4 positions. The lower the normalized high-frequency power (nHFP) in the supine position, the larger the percent age increase in nHFP when the position was changed from supine to another recumbent position in both CAD patients and controls. There was no significant change in the respiratory rate when the position was changed from supine to any of the other 4 positions. Conclusions Right lateral decubitus position leads to the highest vagal modulation in the controls, whereas the supine position leads to the lowest vagal modulation in the CAD patients. In addition to the right lateral decubitus position, both the right and left prone positions can be used as a vagal enhancer in patients with CAD as compared with supine, especially for those patients who have severely reduced cardiac vagal modulation while supine. (Circ J 2008; 72: 902 -908)

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Nonlinear characteristics of heart rate time series: influence of three recumbent positions in patients with mild or severe coronary artery disease

Cited by 37 publications

References 35 publications

Entropy analysis of the EEG background activity in Alzheimer's disease patients

Entropy analysis of the EEG background activity in Alzheimer's disease patients

Analysis of MEG recordings from Alzheimer's disease patients with sample and multiscale entropies

Comparison of Effect of 5 Recumbent Positions on Autonomic Nervous Modulation in Patients With Coronary Artery Disease

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