Higuchi fractal dimension and spectral entropy as measures of depth of sedation in intensive care unit

Anier, Andres; Lipping, Tarmo; Melto, S.; Hovilehto, S.

doi:10.1109/iembs.2004.1403210

Cited by 20 publications

(11 citation statements)

References 8 publications

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“…Here, we undertake the same analysis as in Vanderlei . Nevertheless, there are other techniques which could be added to the [CFP] such as DFA, Shannon entropy, fractal dimension , correlation dimension , approximate entropy , and sample entropy . There is further evidence that spectral derivatives of correlation dimension, approximate entropy, and sample entropy could be achieved by applying the interpeak algorithms to the Welch power spectra as for spectral entropy and sDFA.…”

Section: Methodsmentioning

confidence: 99%

Risk evaluation of diabetes mellitus by relation of chaotic globals to HRV

2014

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This study's aim is to analyze heart rate dynamics in subjects with diabetes by measures of heart rate variability (HRV). The correlation of chaotic global parameters in the two cohorts is able to assess the probability of cardiac failure and other dynamical diseases. Adults (46) were divided into two equal groups. The autonomic evaluation consisted of measuring HRV for 30 min in supine position in absence of any physical, sensory, or pharmacological stimuli. Chaotic global parameters are able to statistically determine which series of electrocardiograph interpeak intervals in short time-series are diabetic and which are not. The chaotic forward parameter that applies all three parameters is suggested to be the most appropriate and robust algorithm. This was decided after tests for normality; followed by one-way analysis of variance (ANOVA1); (P < 0.09) and Kruskal-Wallis technique (P < 0.03). Principal component analysis implied two components represent 99.8% of total variance. Therefore, diabetes is a disease which reduces the chaotic response and, as such may be termed a dynamical condition such as are cardiac arrest, asthma, and epilepsy.

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Section: Methodsmentioning

confidence: 99%

Risk evaluation of diabetes mellitus by relation of chaotic globals to HRV

2014

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“…HFD, calculated from the electroencephalographic signal, has proved to be a sensitive measure of the level of hypnosis. 14,15 A more formal treatment of these measures together with corresponding references and values of algorithm parameters used in the present study are given in the appendix.…”

Section: Off-line Signal Processingmentioning

confidence: 99%

Behavior of Entropy/Complexity Measures of the Electroencephalogram during Propofol-induced Sedation

et al. 2007

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“…A variety of methods and commercial devices for measuring the depth of anesthesia based on EEG signals have been developed [6,7,8,9,10,11,12,13]. At present, the underlying mechanism of effects of anesthesia agents on the CNS is not well understood.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of EEG β2/θ -ratio and channel locations in measuring anesthesia depth

Tan¹,

Wang²,

McKelvey³

et al. 2010

JBiSE

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In this paper, the ratio of powers in the frequency bands of 2 β and  waves in EEG signals (termed as the 2 β /θ-ratio) was introduced as a potential enhancement in measuring anesthesia depth. The 2 β /θ-ratio was compared to the relative  -ratio which had been commercially used in the BIS monitor. Sensitivity and reliability of the 2 β /θ-ratio and EEG measurement locations were analyzed for their effectiveness in measuring anesthesia depth during different stages of propofol induced anesthesia (awake, induction, maintenance, and emergence). The analysis indicated that 1) the relative  -ratio and 2 β /θ-ratio derived from the prefrontal, frontal, and the central cortex EEG signals were of substantial sensitivity for capturing anesthesia depth changes. 2) Certain channel positions in the frontal part of the cortex, such as , had the combined benefits of substantial sensitivity and noise resistance. 3) The F4 2 β /θ-ratio captured the initial excitation, while the relative  -ratio did not. 4) In the maintenance and emergence stages, the 2 β /θ -ratio showed improved reliability. Implications: The ratio of powers in EEG frequency bands 2 β and  derived from the frontal cortex EEG channels has combined benefits of substantial sensitivity and noise resistance in measuring anesthesia depth.

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Higuchi fractal dimension and spectral entropy as measures of depth of sedation in intensive care unit

Cited by 20 publications

References 8 publications

Risk evaluation of diabetes mellitus by relation of chaotic globals to HRV

Risk evaluation of diabetes mellitus by relation of chaotic globals to HRV

Behavior of Entropy/Complexity Measures of the Electroencephalogram during Propofol-induced Sedation

Evaluation of EEG β2/θ -ratio and channel locations in measuring anesthesia depth

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