Automatic sleep-stage scoring based on photoplethysmographic signals.

abstract：:ECG-gated electrical impedance tomographic spectroscopy (EITS) measurements of the lungs were taken on seven normal subjects in the frequency range 9.6 kHz to 614.4 kHz. The results show that in late systole the resistivity p' relative to the R-wave (i.e. p' = 1 at the R-wave) decreases consistently within the lung. I...

journal_title：Physiological measurement

authors： Nopp P,Zhao TX,Brown BH,Wang W

更新日期：1996-11-01 00:00:00

abstract：:The main components responsible for the mechanical behavior of the arterial wall are collagen, elastin, and smooth muscle cells (SMCs) in the medial layer. We determined the structural and mechanical changes in porcine carotid arteries after administration of Triton® X-100, elastase, and collagenase using the inflatio...

journal_title：Physiological measurement

authors： Kochová P,Kuncová J,Svíglerová J,Cimrman R,Miklíková M,Liška V,Tonar Z

更新日期：2012-08-01 00:00:00

abstract：OBJECTIVE:The ventilators involved in non-invasive mechanical ventilation commonly provide ventilator support via a facemask. The interface of the mask with a patient promotes air leaks that cause errors in the feedback information provided by a pneumatic sensor and hence patient-ventilator asynchrony with multiple neg...

journal_title：Physiological measurement

authors： Ivanović MD,Petrovic J,Savić A,Gligorić G,Miletić M,Vukčević M,Bojović B,Hadžievski L,Allsop T,Webb DJ

更新日期：2018-04-26 00:00:00

abstract：OBJECTIVE:The aim of the study was to explore the feasibility of titrating tidal volume (V T) and positive end-expiratory pressure (PEEP) during one-lung ventilation (OLV) based on ventilation distribution and oxygenation. APPROACH:Twenty-four consecutive patients requiring intubation with a double-lumen tube and subs...

journal_title：Physiological measurement

authors： Zhao Z,Wang W,Zhang Z,Xu M,Frerichs I,Wu J,Moeller K

更新日期：2018-03-29 00:00:00

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

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

更新日期：1995-11-01 00:00:00

abstract：:Current methods for analysing foetal heart rate (FHR) patterns have yet to meet their full potential in the recognition of hypoxia in the foetus. Following the recent suggestion that fractal analysis can be applied to FHR recordings, the current paper describes a method for distinguishing two simultaneous fractal dime...

journal_title：Physiological measurement

authors： Gough NA

更新日期：1993-08-01 00:00:00

abstract：:A gamma fit facilitates smoothing and extrapolation of distorted tracer-dilution curves in blood flow studies. Theoretically based empirical estimators were developed as simple alternatives to direct regression approaches from simulated gamma distributions with a wide range of shape asymmetry. Key curve features of pe...

journal_title：Physiological measurement

authors： Lopatatzidis A,Millard RK

更新日期：2001-11-01 00:00:00

abstract：:Electrical impedance tomography (EIT) measures the conductivity distribution within an object based on the current applied and voltage measured at surface electrodes. Thus, EIT images are sensitive to electrode properties (i.e. contact impedance, electrode area and boundary shape under the electrode). While some of th...

journal_title：Physiological measurement

authors： Boyle A,Adler A

更新日期：2011-07-01 00:00:00

abstract：:When used in large, national surveillance programmes, objective measurement tools provide prevalence estimates of low physical activity guideline compliance and high amounts of sedentary time. There are undoubtedly a plethora of reasons for this but one possible contributing factor is the current lack of behavioural c...

journal_title：Physiological measurement

authors： Loveday A,Sherar LB,Sanders JP,Sanderson PW,Esliger DW

更新日期：2016-10-01 00:00:00

abstract：OBJECTIVE:U-shaped patterns, characteristic periods of time observed in tachograms, are a specific subgroup among very low frequency components characterized by relatively short periods of smooth accelerations followed by decelerations of heart rhythm. In this study, we characterize this phenomenon and its effect on he...

journal_title：Physiological measurement

authors： Soliński M,Kuklik P,Gierałtowski J,Baranowski R,Graff B,Żebrowski J

更新日期：2020-07-02 00:00:00

abstract：:Muscle stiffness is known to vary as a result of a variety of disease states, yet current clinical methods for quantifying muscle stiffness have limitations including cost and availability. We investigated the capability of shear wave elastography (SWE) to measure variations in gastrocnemius shear wave speed induced v...

journal_title：Physiological measurement

authors： Chernak LA,DeWall RJ,Lee KS,Thelen DG

更新日期：2013-06-01 00:00:00

abstract：:Vascular and clinical assessments of arterio-venous fistula (AVF) function and access are important in patients undergoing or preparing to undergo renal dialysis. Objective assessment techniques include colour duplex ultrasound and more recently medical infrared thermography. Ideally, these should help assess problems...

journal_title：Physiological measurement

authors： Allen J,Oates CP,Chishti AD,Ahmed IA,Talbot D,Murray A

更新日期：2006-01-01 00:00:00

abstract：:In this study, a framework for the characterization of the dynamic interactions between RR variability (RRV) and systolic arterial pressure variability (SAPV) is proposed. The methodology accounts for the intrinsic non-stationarity of the cardiovascular system and includes the assessment of both the strength and the p...

journal_title：Physiological measurement

authors： Orini M,Laguna P,Mainardi LT,Bailón R

更新日期：2012-03-01 00:00:00

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

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

abstract：:Previous studies demonstrate that it is possible to evaluate a heart graft rejection condition using a bioimpedance technique by means of an intracavitary catheter. We propose to use a less invasive technique consisting in the use of a transoesophageal catheter and two standard ECG electrodes on the thorax. The aim of...

journal_title：Physiological measurement

authors： Giovinazzo G,Ribas N,Cinca J,Rosell-Ferrer J

更新日期：2011-07-01 00:00:00

abstract：UNLABELLED:The study created an 'ex vivo' model to test different algorithms for measurements of mucosal haemoglobin saturation with visible light spectrophotometry (VLS). The model allowed comparison between algorithms, but it also allowed comparison with co-oximetry using a 'gold standard' method. This has not been d...

journal_title：Physiological measurement

authors： Gade J,Greisen G

更新日期：2016-09-01 00:00:00

abstract：:Focused impedance measurements (FIM) are used in several fields, and address the problem of measuring the volume impedance of an object within a volume conductor. Several electrode configurations are possible, and these have different properties. Sensitivity fields of four configurations have been investigated. We pre...

journal_title：Physiological measurement

authors： Pettersen FJ,Ferdous H,Kalvøy H,Martinsen ØG,Høgetveit JO

更新日期：2014-06-01 00:00:00

abstract：:Linear methods of reconstruction play an important role in medical electrical impedance tomography (EIT) and there is a wide variety of algorithms based on several assumptions. With the Graz consensus reconstruction algorithm for EIT (GREIT), a novel linear reconstruction algorithm as well as a standardized framework ...

journal_title：Physiological measurement

authors： Antink CH,Pikkemaat R,Malmivuo J,Leonhardt S

更新日期：2015-06-01 00:00:00

abstract：:The purpose of this study was to examine the performance of dual-energy computed tomography (DECT) for the quantification of liver fat content (LFC). We prepared two phantoms: homogenized mixtures of porcine liver and fat and homogeneous mixtures of liver- and fat-equivalent solutions. Tubes containing mixtures with k...

journal_title：Physiological measurement

authors： Li JH,Tsai CY,Huang HM

更新日期：2014-04-01 00:00:00

abstract：:Tetrapolar linear arrays are commonly used in geophysics to explore the vertical distribution of resistivity values in a geological section of a specific point on the earth. This technique, known as vertical electric sounding (VES), uses different electrode configurations. For our experiments, we utilized its more pop...

journal_title：Physiological measurement

authors： Gonzalez CA,offniga O,Padilla LE

更新日期：1997-02-01 00:00:00

abstract：OBJECTIVE:To investigate the feasibility of the detection of brief orofacial pain sensations from easily recordable physiological signals by means of machine learning techniques. APPROACH:A total of 47 subjects underwent periodontal probing and indicated each instance of pain perception by means of a push button. Simu...

journal_title：Physiological measurement

authors： Teichmann D,Klopp J,Hallmann A,Schuett K,Wolfart S,Teichmann M

更新日期：2018-09-27 00:00:00

abstract：:Non-contact heart and lung activity monitoring would be a desirable supplement to conventional monitoring techniques. Based on the potential of non-contact magnetic induction measurements, requirements for an adequate monitoring system were estimated. This formed the basis for the development of the presented extendab...

journal_title：Physiological measurement

authors： Steffen M,Heimann K,Bernstein N,Leonhardt S

更新日期：2008-06-01 00:00:00

abstract：OBJECTIVE:Storage of physiological waveform data for retrospective analysis presents significant challenges. Resultant data can be very large, and therefore becomes expensive to store and complicated to manage. Traditional database approaches are not appropriate for large scale storage of physiological waveforms. Our g...

journal_title：Physiological measurement

authors： Goodwin AJ,Eytan D,Greer RW,Mazwi M,Thommandram A,Goodfellow SD,Assadi A,Jegatheeswaran A,Laussen PC

更新日期：2020-04-20 00:00:00

abstract：:The purpose of this study was to investigate the linearity and reliability of the mechanomyographic (MMG) amplitude versus submaximal isometric force relationship for the vastus lateralis. Twenty healthy subjects (mean +/- SD age = 24.0 +/- 4.3 years) volunteered to perform submaximal isometric muscle actions of the d...

journal_title：Physiological measurement

authors： Beck TW,DeFreitas JM,Stock MS

更新日期：2009-10-01 00:00:00

abstract：:Despite significant advances in adult clinical electrocardiography (ECG) signal processing techniques and the power of digital processors, the analysis of non-invasive foetal ECG (NI-FECG) is still in its infancy. The Physionet/Computing in Cardiology Challenge 2013 addresses some of these limitations by making a set ...

journal_title：Physiological measurement

authors： Behar J,Oster J,Clifford GD

更新日期：2014-08-01 00:00:00

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

authors： Halter R,Hartov A,Paulsen K

更新日期：2008-03-01 00:00:00

abstract：:This paper presents the design, construction and testing of a device to measure pressure-volume loops in the left ventricle of conscious, ambulatory rats. Pressure is measured with a standard sensor, but volume is derived from data collected from a tetrapolar electrode catheter using a novel admittance technique. Ther...

journal_title：Physiological measurement

authors： Raghavan K,Feldman MD,Porterfield JE,Larson ER,Jenkins JT,Escobedo D,Pearce JA,Valvano JW

更新日期：2011-06-01 00:00:00

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

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

更新日期：2016-07-01 00:00:00

abstract：OBJECTIVE:An artefact-free electrocardiogram (ECG) is essential during cardiac arrest to decide therapy such as defibrillation. Mechanical cardiopulmonary resuscitation (CPR) devices cause movement artefacts that alter the ECG. This study analyzes the effectiveness of mechanical CPR artefact suppression filters to rest...

journal_title：Physiological measurement

authors： Isasi I,Irusta U,Aramendi E,Idris AH,Sörnmo L

更新日期：2020-11-06 00:00:00

abstract：OBJECTIVE:To investigate if modern seismocardiography (SCG) and ballistocardiography (BCG) are useful in the detection of hemodynamic changes occurring during simulated obstructive apneic events. METHODS:Forty-seven healthy volunteers performed a voluntary maximum Mueller maneuver (MM) for 10 s, and SCG and BCG signal...

journal_title：Physiological measurement

authors： Morra S,Hossein A,Gorlier D,Rabineau J,Chaumont M,Migeotte PF,Van De Borne P

更新日期：2020-07-09 00:00:00