In vivo bioimpedance changes during haemorrhagic and ischaemic stroke in rats: towards 3D stroke imaging using electrical impedance tomography.

abstract：OBJECTIVE:Advanced neuroimaging has proved to be pivotal in the management of acute ischemic stroke. The use of CT perfusion (CTP) core and penumbra parameters to predict the outcome in wake-up stroke (WUS) patients in everyday clinical scenarios has not yet been investigated. The aim of our study was to investigate th...

journal_title：Physiological measurement

authors： Ajčević M,Furlanis G,Stella AB,Cillotto T,Caruso P,Ridolfi M,Lugnan C,Miladinović A,Ukmar M,Cova MA,Accardo A,Manganotti P,Naccarato M

更新日期：2020-08-11 00:00:00

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

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

更新日期：2006-10-01 00:00:00

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

authors： Manivannan A,Sharp PF,Forrester JV

更新日期：1994-08-01 00:00:00

abstract：:This paper represents a reconstruction algorithm using a direct sensitivity matrix (DSM) approach for fast 3D image reconstruction in electrical impedance imaging. The boundary element method (BEM) is used in the construction of this matrix. The first images of a conductivity perturbation inside a sphere are reconstru...

journal_title：Physiological measurement

authors： Morucci JP,Granié M,Lei M,Chabert M,Marsili PM

更新日期：1995-08-01 00:00:00

abstract：:The state-dependent portion of cardio-vagal baroreflex control is called baroreflex hyteresis: we observe hysteresis when RR interval and carotid diameter depend on both the direction and value of arterial pressure. The elasticity of arterial walls, as well as the responsiveness of central command reset controls the r...

journal_title：Physiological measurement

authors： Ler AS,Cohen MA,Taylor JA

更新日期：2010-06-01 00:00:00

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

authors： Yerworth R,Bayford R

更新日期：2013-06-01 00:00:00

abstract：OBJECTIVE:Metal exposures have been linked with many adverse health outcomes affecting nearly every system in the body. Exposure to metals has been tracked primarily using blood. Blood metal concentrations have drawbacks as biomarkers stemming from the metals' short biologic half-lives, shipping and storage requirement...

journal_title：Physiological measurement

authors： Specht AJ,Kponee K,Nkpaa KW,Balcom PH,Weuve J,Nie LH,Weisskopf MG

更新日期：2018-08-31 00:00:00

abstract：:Fluorine (F) plays an important role in dental health and bone formation. Many studies have shown that excess fluoride (F(-)) can result in dental or skeletal fluorosis, while other studies have indicated that a proper dosage of fluoride may have a protective effect on bone fracture incidence. Fluorine is stored almos...

journal_title：Physiological measurement

authors： Chamberlain M,Gräfe JL,Byun SH,Chettle DR,Egden LM,Orchard GM,Webber CE,McNeill FE

更新日期：2012-02-01 00:00:00

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

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

更新日期：2000-08-01 00:00:00

abstract：:Nasal obstruction is common and may disturb well-being during daytime and sleep. Its objective assessment by standard methods requires patient cooperation and inconvenient instrumentation. Therefore, the purpose of this study was to develop a novel, unobtrusive technique for continuous monitoring of changes in nasal c...

journal_title：Physiological measurement

authors： Thurnheer R,Bloch KE

更新日期：2004-04-01 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：:The ability to predict if an atrial fibrillation (AF) episode terminates spontaneously or not through non-invasive techniques is a challenging problem of great clinical interest. This fact could avoid useless therapeutic interventions and minimize the risks for the patient. The present work introduces a robust AF pred...

journal_title：Physiological measurement

authors： Alcaraz R,Rieta JJ

更新日期：2008-01-01 00:00:00

abstract：:Heart rate variability (HRV) is often analysed using short-term studies. Our objective was to compare two of them in a group of diabetic patients (reduced HRV) and in a control group. From the same 10 min surface electrocardiogram (ECG) two recordings were obtained. In one of them the whole signal was acquired through...

journal_title：Physiological measurement

authors： Migliaro ER,Canetti R,Contreras P,Hakas M,Eirea G,Machado A

更新日期：2004-12-01 00:00:00

abstract：:Although people spend a third of their day engaged in sedentary activities, research on heart activity during sitting is almost nonexistent because of the discomfort experienced when electrocardiogram (ECG) measurement electrodes are attached to the body. Accordingly, in this study, a system was developed to monitor h...

journal_title：Physiological measurement

authors： Lim E,Lee HK,Myoung HS,Lee KJ

更新日期：2015-03-01 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：:Patients with claudication have an inadequate haemodynamic response to exercise. Blood flow response will not only have a magnitude, but also a rate of change. There is scope for investigating these parameters, as manipulation of the factors which control them may benefit work to improve the treatment for claudication...

journal_title：Physiological measurement

authors： Meeson S,Srodon PD

更新日期：2005-12-01 00:00:00

abstract：:Remote sensing of the reflectance photoplethysmogram using a video camera typically positioned 1 m away from the patient's face is a promising method for monitoring the vital signs of patients without attaching any electrodes or sensors to them. Most of the papers in the literature on non-contact vital sign monitoring...

journal_title：Physiological measurement

authors： Tarassenko L,Villarroel M,Guazzi A,Jorge J,Clifton DA,Pugh C

更新日期：2014-05-01 00:00:00

abstract：:Using a primary coil that induces eddy currents in a volume conductor, and a pair of secondary coils configured to form a differential transformer, it is possible to measure the conductivity of a volume conductor by the magnetic fields of the induced eddy currents. This method is especially favourable for measuring im...

journal_title：Physiological measurement

authors： Netz J,Forner E,Haagemann S

更新日期：1993-11-01 00:00:00

abstract：:In this study, we developed a novel technique for estimating non-constrained and cuffless blood pressure (BP) that was based on electrocardiogram (ECG) and ballistocardiogram (BCG). The BCG was non-invasively measured using a common electronic weighing scale when a subject was standing on it. The ECG was measured usin...

journal_title：Physiological measurement

authors： Shin JH,Lee KM,Park KS

更新日期：2009-07-01 00:00:00

abstract：OBJECTIVE:Idiopathic pulmonary fibrosis (IPF) is a progressive and fatal disease characterized by excessive deposition of collagen and associated stiffening of lung tissue. While it is known that inflammation and dysfunction of fibroblasts are involved in disease development, it remains poorly understood how cells and ...

journal_title：Physiological measurement

authors： Wellman TJ,Mondoñedo JR,Davis GS,Bates JHT,Suki B

更新日期：2018-06-28 00:00:00

abstract：OBJECTIVE:Cognitive reserve (CR) refers to the capacity of the brain to actively cope with damage via the implementation of remedial cognitive processes. Traditional CR measurements focus on static proxies, which may not be able to appropriately estimate dynamic changes in CR. This study therefore investigated the cogn...

journal_title：Physiological measurement

authors： Yang CY,Lin CP

更新日期：2020-07-07 00:00:00

abstract：OBJECTIVE:In this research, we introduce a new methodology for atrial fibrillation (AF) diagnosis during sleep in a large population sample at risk of sleep-disordered breathing. APPROACH:The approach leverages digital biomarkers and recent advances in machine learning (ML) for mass AF diagnosis from overnight-hours o...

journal_title：Physiological measurement

authors： Chocron A,Efraim R,Mandel F,Rueschman M,Palmius N,Penzel T,Elbaz M,Behar JA

更新日期：2020-11-06 00:00:00

abstract：:Dual-energy x-ray absorptiometry (DXA) is a precise, widely used method for measuring bone mineral density (BMD), usually of the lumbar spine and femoral neck. Recent developments, such as a lower x-ray tube current and pixel by pixel analysis, enable smaller bones and thinner tissues volumes, as in the hand, to be me...

journal_title：Physiological measurement

authors： Steel SA,Swann P,Langley G,Langton CM

更新日期：1997-08-01 00:00:00

abstract：:There are currently no objective means of quantifying chest wall vibrations during manual physiotherapy. The aims of the study were to (i) develop a method to quantify physiotherapy-applied forces and simultaneous changes in respiratory flow and pressure, (ii) assess the feasibility of using this method in ventilated ...

journal_title：Physiological measurement

authors： Gregson RK,Stocks J,Petley GW,Shannon H,Warner JO,Jagannathan R,Main E

更新日期：2007-09-01 00:00:00

abstract：:The pre-ejection period (PEP) has recently been described as a potential parameter for monitoring cardiac preload. This study further investigated the influence of changes in intravascular volume status and the application of positive end-expiratory pressure (PEEP) on the pre-ejection period. In ten pigs, ECG, arteria...

journal_title：Physiological measurement

authors： Kubitz JC,Kemming GI,Schultheib G,Starke J,Podtschaske A,Goetz AE,Reuter DA

更新日期：2005-12-01 00:00:00

abstract：:The most common method of clinical measurement of arterial blood pressure is by means of the cuff sphygmomanometer. This instrument has provided fundamental quantitative information on arterial pressure in individual subjects and in populations and facilitated estimation of cardiovascular risk related to levels of blo...

journal_title：Physiological measurement

authors： Avolio AP,Butlin M,Walsh A

更新日期：2010-01-01 00:00:00

abstract：:Acupuncture (ACU) is known to be effective in ischemia treatment, and glutamate (GLU) excitotoxicity is an important factor in neuronal cell death. We observed the effect of ACU on cerebral blood flow (%CBF) and DeltaGLU (the changes in GLU release) in the ischemic stroke rat model of diabetic mellitus (DM). A global ...

journal_title：Physiological measurement

authors： Choi S,Lee GJ,Chae SJ,Kang SW,Yin CS,Lee SH,Choi SK,Park HK

更新日期：2010-05-01 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：OBJECTIVE:PaCO2 affects cerebral blood flow (CBF) and its regulatory mechanisms, but the effects of CO2 measurement technique on cerebrovascular parameters are unknown. In order to determine if the two most commonly used approaches, face mask (FM) or nasal cannulae (NC), are interchangeable or not, we tested the hypoth...

journal_title：Physiological measurement

authors： Minhas JS,Robinson T,Panerai R

更新日期：2017-06-22 00:00:00

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

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