Linear and nonlinear characteristics of heart rate time series in obesity and during weight-reduction surgery.

Abstract:

:Obesity is associated with abnormal cardiac regulation by the autonomic nervous system (ANS), this being reversed by weight loss. Bariatric (weight-reduction) surgery can induce substantial long-term weight reductions. This study compares the acute influence on ANS control of two different types of bariatric surgery involving laparascopic and open procedures. To distinguish between the cardiac influences of surgery and obesity, we perform the same analysis for laparascopic surgery in non-obese patients. Eight morbidly obese and five non-obese patients underwent surgery. Obese patients received either laparoscopic procedures (group A: n = 5, BMI = 44.3 +/- 2.7 kg m(2)) or open procedures (group B: n = 3, BMI = 55.2 +/- 4.5 kg m(2)) and non-obese patients received a laparoscopic procedure (group C: n = 5, BMI = 30.8 +/- 5.8 kg m(-2)). Holter ECG was recorded and heart rate variability (HRV) was quantified together with measures of complexity (sample entropy) and structure (Hurst coefficient, scaling coefficient) of the heart rate data. Multifractal characteristics of heart rate data, not previously reported for obese patients, are also quantified and interpreted. Mixed model ANOVA was used to assess the magnitudes of each quantified variable, with surgical group and perioperative time as main factors. HRV measures were influenced only during anaesthesia (LFn increase: p = 0.009; HFn decrease: p = 0.033) and did not discriminate between patient groups. Multifractality was the only characteristic of heart rate data that discriminated between patient groups, being significantly (p < 0.001) greater in non-obese (group C) compared with obese patients (groups A and B, who had similar multifractal properties). Multifractality was also enhanced during anaesthesia (p = 0.028) but did not differ for other stages. We conclude that obesity per se rather than response to surgery is the cause of reduced multifractality. Reduced multifractality in obesity might reflect a diminished 'scaling' or 'collective response' across the multiple autonomic modulators of heart rate. The multifractal method appears to be a more sensitive measure of integrated cardiac autonomic function than linear methods for these patients.

journal_name

Physiol Meas

authors

Alam I,Lewis MJ,Morgan J,Baxter J

doi

10.1088/0967-3334/30/7/002

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

541-57

issue

7

eissn

0967-3334

issn

1361-6579

pii

S0967-3334(09)02752-X

journal_volume

30

pub_type

杂志文章
  • The effect of serial data collection on the accuracy of electrical impedance tomography images.

    abstract::There has been a surge of interest in using electrical impedance tomography (EIT) for monitoring regional lung ventilation, however, EIT is an ill-conditioned problem, and errors/noise in the boundary voltages can have an undesirable effect on the quality of the final image. Most EIT systems in clinical usage use seri...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/34/6/659

    authors: Yerworth R,Bayford R

    更新日期:2013-06-01 00:00:00

  • Snore site discrimination using statistical moments of free field snoring sounds recorded during sleep nasendoscopy.

    abstract::The non-invasive measurement of free field snoring sounds to estimate the site of snoring is an important development in the diagnosis, treatment and management of sleep-related breathing disorders. We investigated characteristics of the probability density function by testing the sensitivity of the statistical moment...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/28/10/008

    authors: Beeton RJ,Wells I,Ebden P,Whittet HB,Clarke J

    更新日期:2007-10-01 00:00:00

  • Transthoracic impedance study with large self-adhesive electrodes in two conventional positions for defibrillation.

    abstract::External defibrillation requires the application of high voltage electrical impulses via large external electrodes, placed on selected locations on the thorax surface. The position of the electrodes is one of the major determinants of the transthoracic impedance (TTI) which influences the intracardiac current flow dur...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/27/10/007

    authors: Krasteva V,Matveev M,Mudrov N,Prokopova R

    更新日期:2006-10-01 00:00:00

  • Electrical impedance myography at frequencies up to 2 MHz.

    abstract::Extension of the frequency range of electrical impedance myography (EIM) to 2 MHz discloses a major rise in the reactance of muscle above 3-500 kHz, together with a slow decrease in the resistance consonant with the Kramers-Kronig relations. This 'upturn' phenomenon is found when the distant current electrode configur...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章

    doi:10.1088/0967-3334/29/6/S29

    authors: Shiffman CA,Kashuri H,Aaron R

    更新日期:2008-06-01 00:00:00

  • The effect of ambient air temperature on whole-body bioelectrical impedance.

    abstract::It has previously been shown that extreme changes in ambient air temperature can affect whole-body bioelectrical impedance. The purpose of this study was to determine if more moderate changes in ambient air temperature, such as those experienced in most laboratory settings, would also affect bioelectric impedance anal...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/25/1/011

    authors: Buono MJ,Burke S,Endemann S,Graham H,Gressard C,Griswold L,Michalewicz B

    更新日期:2004-02-01 00:00:00

  • A portable device with low-power consumption for monitoring mouse vital signs during in vivo photoacoustic imaging and photothermal therapy.

    abstract:OBJECTIVE:The aim of this study was to monitor the physiological changes and cytotoxic effects of exogenous contrast agents during photoacoustic imaging (PAI) and photothermal therapy (PTT). In this paper, a low-power telemetric device for mouse vital signs monitoring was designed and demonstrated. APPROACH:The power ...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/1361-6579/aba6a1

    authors: Phan DT,Phan TTV,Bui NT,Park S,Choi J,Oh J

    更新日期:2021-01-01 00:00:00

  • Wavelet-based real-time calculation of multiple physiological parameters on an embedded platform.

    abstract:OBJECTIVE:This paper aims to present how physiological signals can be processed based on wavelet decomposition to calculate multiple physiological parameters in real-time on an embedded platform. APPROACH:An ECG and PPG are decomposed to the appropriate scale based on a quadratic spline wavelet base in order to obtain...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/1361-6579/ab6f52

    authors: Tang M,Xia P,He Z,Zhao Z,Chen X,Yang T,Zhang Z,Zhan Q,Li X,Fang Z

    更新日期:2020-03-06 00:00:00

  • Performance measurements of an infrared digital scanning laser ophthalmoscope.

    abstract::Direct digital acquisition of images using a scanning laser ophthalmoscope (SLO) offers several advantages over the conventional fundus camera; in particular, the ability to produce tomographic images using a confocal aperture. This note describes measurements of the performance of an SLO. Spatial resolution, measured...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/15/3/010

    authors: Manivannan A,Sharp PF,Forrester JV

    更新日期:1994-08-01 00:00:00

  • Real time impedance plots with arbitrary frequency components.

    abstract::Temporal changes in the impedance spectra of bioelectrodes in contact with skin provide useful data for comparisons between differing electrode materials and skin preparation methods. Traditional impedance measuring systems employ swept frequency methods which will distort results in the impedance spectra of a sample ...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/20/1/008

    authors: Searle A,Kirkup L

    更新日期:1999-02-01 00:00:00

  • Adaptive techniques in electrical impedance tomography reconstruction.

    abstract::We present an adaptive algorithm for solving the inverse problem in electrical impedance tomography. To strike a balance between the accuracy of the reconstructed images and the computational efficiency of the forward and inverse solvers, we propose to combine an adaptive mesh refinement technique with the adaptive Ka...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/35/6/1111

    authors: Li T,Isaacson D,Newell JC,Saulnier GJ

    更新日期:2014-06-01 00:00:00

  • Fetal QRS detection and heart rate estimation: a wavelet-based approach.

    abstract::Fetal heart rate monitoring is used for pregnancy surveillance in obstetric units all over the world but in spite of recent advances in analysis methods, there are still inherent technical limitations that bound its contribution to the improvement of perinatal indicators. In this work, a previously published wavelet t...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/35/8/1723

    authors: Almeida R,Gonçalves H,Bernardes J,Rocha AP

    更新日期:2014-08-01 00:00:00

  • Life-threatening false alarm rejection in ICU: using the rule-based and multi-channel information fusion method.

    abstract::False alarm (FA) rates as high as 86% have been reported in intensive care unit monitors. High FA rates decrease quality of care by slowing staff response times while increasing patient burdens and stresses. In this study, we proposed a rule-based and multi-channel information fusion method for accurately classifying ...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/37/8/1298

    authors: Liu C,Zhao L,Tang H,Li Q,Wei S,Li J

    更新日期:2016-08-01 00:00:00

  • Video-based respiration monitoring with automatic region of interest detection.

    abstract::Vital signs monitoring is ubiquitous in clinical environments and emerging in home-based healthcare applications. Still, since current monitoring methods require uncomfortable sensors, respiration rate remains the least measured vital sign. In this paper, we propose a video-based respiration monitoring method that aut...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/37/1/100

    authors: Janssen R,Wang W,Moço A,de Haan G

    更新日期:2016-01-01 00:00:00

  • Techniques for early detection of Alzheimer's disease using spontaneous EEG recordings.

    abstract::Alzheimer's disease (AD) is a degenerative disease which causes serious cognitive decline. Studies suggest that effective treatments for AD may be aided by the detection of the disease in its early stages, prior to extensive neuronal degeneration. In this paper, we propose a set of novel techniques which could help to...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/28/4/001

    authors: Woon WL,Cichocki A,Vialatte F,Musha T

    更新日期:2007-04-01 00:00:00

  • Measurement of pupil reactivity using fast pupillometry.

    abstract::Analysis of human eye pupil reactivity is a very valuable diagnostic method used mainly for evaluation of the condition of the autonomic nervous system and the visual system. The paper presents an experimental pupillometer built in the Institute of Physics of the Wroclaw University of Technology. The apparatus makes i...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/28/1/006

    authors: Hachol A,Szczepanowska-Nowak W,Kasprzak H,Zawojska I,Dudzinski A,Kinasz R,Wygledowska-Promienska D

    更新日期:2007-01-01 00:00:00

  • Changes in cerebral hemodynamics during a sleep-deprived video-electroencephalogram in healthy children.

    abstract::This study investigates the cerebral hemodynamic changes during a routine sleep-deprived video-electroencephalogram (SD-VEEG) in healthy children. Forty-two children with normal intelligence were examined. The children were 5-14 years of age, and their electroencephalograms (EEGs) were within the normal range. Each su...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/37/7/981

    authors: Peng B,Li J,Wang J,Liang X,Zheng Z,Mai J

    更新日期:2016-07-01 00:00:00

  • Time-related heart autonomic balance characteristics in healthy subjects.

    abstract::Changes of the heart autonomic balance between morning (8-9 h) and afternoon (14-15 h) measurements were studied in 22 healthy subjects. The selection of these two daytime periods was substantiated by the established higher risk of cardiovascular incidents in the morning and the relative balance of the vegetative nerv...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/24/3/309

    authors: Matveev M,Prokopova R,Nachev Ch

    更新日期:2003-08-01 00:00:00

  • Fetal beat detection in abdominal ECG recordings: global and time adaptive approaches.

    abstract::We present a method for location of fetal QRS in maternal abdominal ECG recordings. This method's initial, global approach was proposed in the context of the 2013 PhysioNet/Computing in Cardiology Challenge where it was tested on the 447 four channel one-minute recordings.The first step is filtering to eliminate basel...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/35/8/1699

    authors: Rodrigues R

    更新日期:2014-08-01 00:00:00

  • A multifrequency multichannel electrical impedance data acquisition system for body fluid shift monitoring.

    abstract::This paper discusses some important issues for the design of electrical impedance measurement systems intended for body fluid shift monitoring, in particular during dialysis treatments. We have studied two common signal generation systems: digital synthesis and carrier recovery. We have found that in prolonged measure...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/16/4/003

    authors: Lozano A,Rosell J,Pallás-Areny R

    更新日期:1995-11-01 00:00:00

  • Patient examinations using electrical impedance tomography--sources of interference in the intensive care unit.

    abstract::Electrical impedance tomography (EIT) is expected to become a valuable tool for monitoring mechanically ventilated patients due to its ability to continuously assess regional lung ventilation and aeration. Several sources of interference with EIT examinations exist in intensive care units (ICU). Our objectives are to ...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/32/12/F01

    authors: Frerichs I,Pulletz S,Elke G,Gawelczyk B,Frerichs A,Weiler N

    更新日期:2011-12-01 00:00:00

  • Real-time arrhythmia detection with supplementary ECG quality and pulse wave monitoring for the reduction of false alarms in ICUs.

    abstract::False intensive care unit (ICU) alarms induce stress in both patients and clinical staff and decrease the quality of care, thus significantly increasing both the hospital recovery time and rehospitalization rates. In the PhysioNet/CinC Challenge 2015 for reducing false arrhythmia alarms in ICU bedside monitor data, th...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/37/8/1273

    authors: Krasteva V,Jekova I,Leber R,Schmid R,Abächerli R

    更新日期:2016-08-01 00:00:00

  • Neural network analysis of oxygenation signals in infants during sleep.

    abstract::The use of artificial neural networks (ANNs) to interpret sleep monitoring signals is described. Recordings from ten infants with apparent life threatening episodes were assigned into training feedforward R-PROP networks. In order to separate good signal from artefact, 60 second time frames of SaO2 and TcPO2 signals w...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章

    doi:10.1088/0967-3334/21/3/401

    authors: Taktak AF,Simpson S,Patel S,Meyer G

    更新日期:2000-08-01 00:00:00

  • Quantitative description of the 3D regional mechanics of the left atrium using cardiac magnetic resonance imaging.

    abstract::The left atrium (LA) plays an important role in the maintenance of hemodynamic and electrical stability of the heart. One of the conditions altering the atrial mechanical function is atrial fibrillation (AF), leading to an increased thromboembolic risk due to impaired mechanical function. Preserving the regions of the...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/35/5/763

    authors: Kuklik P,Molaee P,Podziemski P,Ganesan AN,Brooks AG,Worthley SG,Sanders P

    更新日期:2014-05-01 00:00:00

  • In vivo quantification of accumulating abdominal fluid using an electrical impedance tomography hemiarray.

    abstract::A new method to image and quantify intra-abdominal haemorrhage using electrical impedance tomography (EIT) was tested in vivo. Supine peritoneal dialysis patients were monitored using an 8-electrode hemiarray placed on the anterior abdomen. EIT measurements were recorded using the EPack II data acquisition system befo...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/32/2/001

    authors: Tucker AS,Ross EA,Paugh-Miller J,Sadleir RJ

    更新日期:2011-02-01 00:00:00

  • Adverse effects of near current-electrode placement in non-invasive bio-impedance measurements.

    abstract::A major problem confronting application of impedance techniques to studies of disease is the extraction of intrinsic properties of the tissue from the measured impedances, which unavoidably involve geometric factors as well. Amongst the foremost are the sizes and locations of the measuring electrode arrays, and this p...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/34/11/1513

    authors: Shiffman CA

    更新日期:2013-11-01 00:00:00

  • New electrohysterogram-based estimators of intrauterine pressure signal, tonus and contraction peak for non-invasive labor monitoring.

    abstract:BACKGROUND:Uterine activity monitoring is an essential part of managing the progress of pregnancy and labor. Although intrauterine pressure (IUP) is the only reliable method of estimating uterine mechanical activity, it is highly invasive. Since there is a direct relationship between the electrical and mechanical activ...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/1361-6579/ab37db

    authors: Benalcazar-Parra C,Garcia-Casado J,Ye-Lin Y,Alberola-Rubio J,Lopez Á,Perales-Marin A,Prats-Boluda G

    更新日期:2019-09-03 00:00:00

  • Video rate electrical impedance tomography of vascular changes: preclinical development.

    abstract::Peripheral vasculature disease is strongly correlated with cardiovascular-associated mortality. Monitoring circulation health, especially in the peripheral limbs, is vital to detecting clinically significant disease at a stage when it can still be addressed through medical intervention. Electrical impedance tomography...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/29/3/006

    authors: Halter R,Hartov A,Paulsen K

    更新日期:2008-03-01 00:00:00

  • A novel method for continuous blood pressure estimation based on a single-channel photoplethysmogram signal.

    abstract:OBJECTIVE:Currently, continuous blood pressure (BP) measurements are mostly based on multi-sensor combinations and datasets with limited BP ranges. Besides, most BP-related features derive from the photoplethysmogram (PPG) signal. The mechanism of PPG signal formation is not considered. We aimed to design a noninvasive...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/1361-6579/abc8dd

    authors: Hu Q,Deng X,Wang A,Yang C

    更新日期:2021-01-01 00:00:00

  • Automatic detection of detached and erroneous electrodes in electrical impedance tomography.

    abstract::One unfortunate occurrence in experimental measurements with electrical impedance tomography is electrodes which become detached or poorly connected, such that the measured data cannot be used. This paper presents an automatic approach to detect such erroneous electrodes. It is based on the assumption that all valid m...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/0967-3334/26/2/017

    authors: Asfaw Y,Adler A

    更新日期:2005-04-01 00:00:00

  • Gene expression signature of obesity in monozygotic twins.

    abstract:OBJECTIVE:Observational studies suggest that obesity might have a Mendelian origin, but it is not clear if gene expression patterns observed in obese subjects are secondary to genetic traits or not. APPROACH:Here we test a transcriptomic signature of obesity previously identified by our group on a large cohort of twin...

    journal_title:Physiological measurement

    pub_type: 杂志文章

    doi:10.1088/1361-6579/aab85a

    authors: Font-Clos F,Zapperi S,La Porta CAM

    更新日期:2018-04-26 00:00:00