Evaluation of spectral entropy to measure anaesthetic depth and antinociception in sevoflurane-anaesthetised Beagle dogs

Morgaz, Juán; Granados, María del Mar; Domínguez, Juan M.; Navarrete, Rocío; Fernández, Andrés; Galán, Alba; Muñoz, Patricia; Gómez-Villamandos, R.J.

doi:10.1016/j.tvjl.2010.06.001

Cited by 17 publications

(23 citation statements)

References 24 publications

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“…Entropy consists of two parameters, namely SE, which reflects the degree of hypnosis in the patient, and RE, which reflects the electromyographic response of the facial muscles to noxious stimulation [17]. Both parameters can distinguish between the awake and unconscious states [18]. In the present study, escalating doses of aminophylline both significantly increased the entropy values and shortened the recovery times.…”

Section: Discussionsupporting

confidence: 52%

Effects of aminophylline on cognitive recovery after sevoflurane anesthesia

El-Tahan

2011

J Anesth

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Section: Discussionsupporting

confidence: 52%

Effects of aminophylline on cognitive recovery after sevoflurane anesthesia

El-Tahan

2011

J Anesth

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“…This concept presents the advantages of multi-resolution analysis and complexity evaluation for timevarying signals, which means that the macro and micro aspects of some special signals could be researched in the time-frequency domain [48]. For this reason, wavelet entropy has gradually been adopted for a great variety of applications in medicine, machinery vibration detection, and system fault diagnosis [35,36,40,41]. The wavelet packet component signal f i j (t) can be expressed by a linear combination of wavelet packet functions ψ i j,k (t) as follows…”

Section: Wavelet Entropy (We)mentioning

confidence: 99%

Entropy Analysis for Damage Quantification of Hysteretic Dampers Used as Seismic Protection of Buildings

et al. 2017

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Relative wavelet energy entropy (RWEE) is proposed to detect and quantify damage to hysteretic dampers used for the passive seismic control of building structures. Hysteretic dampers have the role of dissipating most of the energy input of an earthquake. Minor or moderate earthquakes do not exhaust the energy dissipation capacity of the dampers, yet they damage them. For this reason, continuous or periodic damper-health evaluation is required to decide if they need to be replaced. Such evaluation calls for the application of efficient structural health monitoring techniques (SHM). This paper focuses on the well-known vibration technique, which is applied to a particular type of hysteretic damper called Web Plastifying Damper (WPD), patented by the University of Granada. Vibration signals, properly recorded by piezoelectric sensors attached around the damaged area of the dampers, are decomposed by means of wavelet packet analysis. Then, the relative wavelet energy entropy of these decompositions is used to calculate the proposed index. Validation of RWEE for this particular application involved dampers installed in two different specimens of reinforced concrete structures subjected to earthquake sequences of increasing intensity. When compared with a well-established mechanical energy-based damage index, results demonstrate that RWEE is a successful and low-cost technique for reliable in-situ monitoring of dampers.

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“…These computations are useful clinically in patients under anaesthesia 16,17 ; or unable to communicate distress as in sleep apnea 18 or dyspnea [19][20][21] and the potential risk associated with diabetes mellitus 14 and obesity 15 has been studied previously using these methods. This study aimed to assess the risk of dynamical disease by novel chaotic globals to HRV in subjects with malnutrition.…”

Section: Introductionmentioning

confidence: 99%

Risk Appraisal by Novel Chaotic Globals to HRV in Subjects With Malnutrition

Barreto

Vanderlei

et al. 2014

J. Hum. Growth Dev.

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The aim of this study is to assess the risk of dynamical diseases in malnourished children. This is achieved by the application of novel chaotic global techniques to the RR-intervals of the electrocardiogram (ECG) in the cohort. Heart Rate Variability (HRV) is an inexpensive and non-invasive tool to measure the autonomic impulses. Here there has been a decrease in chaotic response of HRV. Seventy children were divided into equal groups and the HRV monitored for 20-25 minutes. The Chaos Forward Parameter (CFP) which applies all three chaotic global parameters is suggested to be the most robust algorithm. These three parameters are high spectral entropy (hsEntropy), high spectral detrended fluctuation analysis (hsDFA) and spectral multi-taper method (sMTM). hsEntropy is a function of the irregularity of amplitude and frequency of the power spectrums peaks. It is derived by applying Shannon entropy to the multi-taper method power spectrum. To derive hsDFA we calculate the spectral adaptation in exactly the same way as for hsEntropy using an adaptive multi-taper method power spectrum with the same settings; but DFA rather than Shannon entropy is the algorithm applied. sMTM is the area between the multi-taper method power spectrum and the baseline. After Anderson-Darling and Lilliefors tests of normality; Kruskal-Wallis was used for the statistical analysis, with the level of significance set at (p < 0.01). Principal Component Analysis (PCA) identified two components representing 100% of total variance. Autonomic imbalance measured as HRV and an increased cardiovascular risk are described for overweight children as well as for malnourished and those with anorexia nervosa. The relationship between malnourishment and complexity measures is useful in the risk assessment of dynamical diseases associated with the condition. This is supportive in treatments, assisting the determination of the level of dietary or pharmacological intervention especially in related dynamical diseases.

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Evaluation of spectral entropy to measure anaesthetic depth and antinociception in sevoflurane-anaesthetised Beagle dogs

Cited by 17 publications

References 24 publications

Effects of aminophylline on cognitive recovery after sevoflurane anesthesia

Effects of aminophylline on cognitive recovery after sevoflurane anesthesia

Entropy Analysis for Damage Quantification of Hysteretic Dampers Used as Seismic Protection of Buildings

Risk Appraisal by Novel Chaotic Globals to HRV in Subjects With Malnutrition

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