Is dynamic cerebral autoregulation measurement using transcranial Doppler ultrasound reproducible in the presence of high concentration oxygen and carbon dioxide?

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：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

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

更新日期：2018-04-26 00:00:00

abstract：:The effects of mechanical stimulation on hemodynamics, such as due to mechanotransduction in vascular endothelial cells, have been widely discussed recently. We previously proposed a resonance model in which the arterial system is treated as a pressure-transmitting system, and suggested that the application of externa...

journal_title：Physiological measurement

authors： Hsiu H,Jan MY,Wang WK,Wang YY

更新日期：2006-02-01 00:00:00

abstract：:Electrical impedance tomography is an imaging method, with which volumetric images of conductivity are produced by injecting electrical current and measuring boundary voltages. It has the potential to become a portable non-invasive medical imaging technique. Until now, implementations have neglected anisotropy even th...

journal_title：Physiological measurement

authors： Abascal JF,Arridge SR,Lionheart WR,Bayford RH,Holder DS

更新日期：2007-07-01 00:00:00

abstract：:The aim of this study was to investigate masticatory muscle activity during deliberately performed functional and non-functional oral tasks. Electromyographic (EMG) surface activity was recorded unilaterally from the masseter, anterior temporalis and suprahyoid muscles in 11 subjects (5 men, 6 women; age = 34.6 +/- 10...

journal_title：Physiological measurement

authors： Farella M,Palla S,Erni S,Michelotti A,Gallo LM

更新日期：2008-12-01 00:00:00

abstract：OBJECTIVE:As the global burden of cardiovascular disease increases, proactive cardiovascular healthcare by means of accurate, precise, continuous, and non-invasive monitoring is becoming crucial. However, no current device is able to provide cardiac hemodynamic monitoring with the aforementioned criterion. Electrical i...

journal_title：Physiological measurement

authors： Arshad SH,Murphy EK,Callahan JM,DeVries JT,Odame KM,Halter RJ

更新日期：2020-10-06 00:00:00

abstract：:Although previous studies have established the feasibility of monitoring esophageal temperature during radiofrequency cardiac ablation using an esophageal temperature probe (ETP), some questions remain regarding its efficacy. The aims of this study were to study the effect of the location of the ETP on the temperature...

journal_title：Physiological measurement

authors： Rodríguez I,Lequerica JL,Berjano EJ,Herrero M,Hornero F

更新日期：2007-05-01 00:00:00

abstract：:In magnetic resonance electrical impedance tomography (MREIT) we inject currents through electrodes placed on the surface of a subject and try to reconstruct cross-sectional resistivity (or conductivity) images using internal magnetic flux density as well as boundary voltage measurements. In this paper we present a st...

journal_title：Physiological measurement

authors： Lee BI,Oh SH,Woo EJ,Lee SY,Cho MH,Kwon O,Seo JK,Baek WS

更新日期：2003-05-01 00:00:00

abstract：:Electrical impedance tomography (EIT) could be significantly advantageous to continuous monitoring of lung development in newborn and, in particular, preterm infants as it is non-invasive and safe to use within the intensive care unit. It has been demonstrated that accurate boundary form of the forward model is import...

journal_title：Physiological measurement

authors： Khor JM,Tizzard A,Demosthenous A,Bayford R

更新日期：2014-06-01 00:00:00

abstract：:We investigated the utility of ICA for evaluation of fetal rhythm in five uncomplicated twin pregnancies and in five twin pregnancies complicated by fetal arrhythmia. Using objective and subjective criteria, we sought to determine how the signal-to-noise ratio, signal fidelity and interference rejection are affected w...

journal_title：Physiological measurement

authors： Mensah-Brown NA,Lutter WJ,Comani S,Strasburger JF,Wakai RT

更新日期：2011-01-01 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：:An accurate reproducible measurement of left ventricular volume is important in the evaluation of cardiac disease. Four methods of left ventricular volume measurement by radionuclide ventriculography have been compared and their reproducibility assessed in a patient group. The methods studied were a geometric method, ...

journal_title：Physiological measurement

authors： Thorley PJ,Sheard KL,Rees MR

更新日期：1993-02-01 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：:A simple wearable device for sit-to-stand timing detection was designed and constructed with rate gyroscopes and accelerometers and a dedicated adaptive algorithm. The method was validated by comparison with optoelectronic equipment. Results from the comparison showed a maximal error always lower than 2.5 x 10(-2) s f...

journal_title：Physiological measurement

authors： Giansanti D,Maccioni G

更新日期：2006-08-01 00:00:00

abstract：:We tested the hypothesis that transmission of arterial pressure to brain tissue oxygenation is low under conditions of arterial pressure instability. Two experimental models of hemodynamic instability were used in healthy human volunteers; (1) oscillatory lower body negative pressure (OLBNP) (N = 8; 5 male, 3 female),...

journal_title：Physiological measurement

authors： Rickards CA,Sprick JD,Colby HB,Kay VL,Tzeng YC

更新日期：2015-04-01 00:00:00

abstract：OBJECTIVE:Evoked tympanic membrane displacement (TMD) is a non-invasive technique for assessing intracranial pressure (ICP). The aim of this study was to define reference intervals (RIs) in the healthy population. APPROACH:Measurements were made in 154 healthy adults. Results were quantified by V m, which is the most ...

journal_title：Physiological measurement

authors： Campbell-Bell CM,Birch AA,Vignali D,Bulters D,Marchbanks RJ

更新日期：2018-01-31 00:00:00

abstract：OBJECTIVE:Eye-tracking devices have become widely used as clinical assessment tools in a variety of applied-scientific fields to measure saccadic eye movements. With the emergence of multiple static and dynamic devices, the concurrent need for algorithm development and validation is paramount. APPROACH:This review ass...

journal_title：Physiological measurement

authors： Stuart S,Hickey A,Vitorio R,Welman K,Foo S,Keen D,Godfrey A

更新日期：2019-02-26 00:00:00

abstract：:Nasal obstruction disturbs comfort during daytime, and sleep quality. Convenient objective assessment of nasal ventilation would be desirable. Therefore, we developed a technique for unobtrusive monitoring of bilateral nasal airflow. Nasal cannulae with separated left- and right-sided tubings were connected to two pre...

journal_title：Physiological measurement

authors： Kohler M,Thurnheer R,Bloch KE

更新日期：2005-02-01 00:00:00

abstract：:The standard electrocardiogram (ECG) is the most common non-invasive way to study atrial fibrillation (AF). In this respect, previous works have shown that the surface lead V(1) reflects mainly the dominant atrial frequency (DAF) of the right atrium (RA), which has been widely used to study AF. In a similar way, AF or...

journal_title：Physiological measurement

authors： Alcaraz R,Hornero F,Rieta JJ

更新日期：2011-01-01 00:00:00

abstract：:The wrist is increasingly being used as the preferred site for objectively assessing physical activity but the relative accuracy of processing methods for wrist data has not been determined. OBJECTIVE:This study evaluates the validity of four processing methods for wrist-worn ActiGraph (AG) data against energy expend...

journal_title：Physiological measurement

authors： Ellingson LD,Hibbing PR,Kim Y,Frey-Law LA,Saint-Maurice PF,Welk GJ

更新日期：2017-06-01 00:00:00

abstract：:This observational study investigated digital auscultation for the purpose of assessing the clinical feasibility of monitoring vascular sounds in pregnancy. The study was performed at the Regional Hospital Viborg, Denmark, and included 29 pregnant women, 10 non-pregnant women and 10 male participants. Digital ausculta...

journal_title：Physiological measurement

authors： Riknagel D,Dinesen B,Zimmermann H,Farlie R,Schmidt S,Toft E,Struijk JJ

更新日期：2016-07-01 00:00:00

abstract：:Objective assessment of stroke-patients' ability to control arm movements is vital for evidence-based therapy and progress monitoring. This study compares three different indices to quantify the quality of wrist movement during a task involving tracking a target on a screen. Each method is assessed in terms of agreeme...

journal_title：Physiological measurement

authors： Notley SV,Turk R,Pickering R,Simpson DM,Burridge JH

更新日期：2007-08-01 00:00:00

abstract：:This paper describes an open loop feedback intelligent system for neonatal intensive care management. The system provides a tool enabling the user to make the final decision to accept or reject the advice given. The system collects 18 parameters from the bedside monitor and ventilator using a Medical Information Bus (...

journal_title：Physiological measurement

authors： Belal SY,Taktak AF,Nevill A,Spencer A

更新日期：2005-08-01 00:00:00

abstract：:A time-varying parametric spectrum estimation method for analysing non-stationary heart rate variability signals is presented. As a case study, the dynamics of heart rate variability during an orthostatic test is examined. In this method, the non-stationary signal is first modelled with a time-varying autoregressive m...

journal_title：Physiological measurement

authors： Tarvainen MP,Georgiadis SD,Ranta-Aho PO,Karjalainen PA

更新日期：2006-03-01 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：OBJECTIVE:Non-contact physiological measurement is a growing research area that allows capturing vital signs such as heart rate (HR) and breathing rate (BR) comfortably and unobtrusively with remote devices. However, most of the approaches work only in bright environments in which subtle photoplethysmographic and balli...

journal_title：Physiological measurement

authors： Chen W,Hernandez J,Picard RW

更新日期：2018-10-30 00:00:00

abstract：:Virtual shunt describes the overall loss of O2 content between the alveolar gas and arterial blood. Clinicians indirectly estimate the magnitude of the virtual shunt by monitoring peripheral blood oxygen saturation (SpO2) using non-invasive pulse oximetry. An inherent limitation of this method is the variable precisio...

journal_title：Physiological measurement

authors： Karlen W,Petersen CL,Dumont GA,Ansermino JM

更新日期：2015-05-01 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: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：:Electrical impedance tomography (EIT) has shown significant promise for lung imaging. One key challenge for EIT in this application is the movement of electrodes during breathing, which introduces artefacts in reconstructed images. Various approaches have been proposed to compensate for electrode movement, but no comp...

journal_title：Physiological measurement

authors： Biguri A,Grychtol B,Adler A,Soleimani M

更新日期：2015-06-01 00:00:00