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Physiological Measurement

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https://www.readbyqxmd.com/read/29767635/detecting-atrial-fibrillation-from-short-single-lead-ecgs-using-statistical-and-morphological-features
#1
Mohamed Athif, Pamodh Chanuka Yasawardene, Chathuri Daluwatte
Point of care ECG devices can improve the early detection of atrial fibrillation (AF). Efficiency of such devices depend on the capability of automatic AF detection against normal sinus rhythm and other arrhythmias from a short single lead ECG record in the presence of noise and artefacts. The objective of this study was to develop an algorithm that classifies a short single lead ECG record into "Normal", "AF", "Other" and "Noisy" classes, and identify challenges in developing such algorithms and potential mitigation steps...
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29767634/measurement-and-estimation-of-human-forced-expiratory-noise-parameters-using-a-microphone-with-a-stethoscope-head-and-a-lapel-microphone
#2
Anna Yur'evna Glazova, Vladimir I Korenbaum, Anatoly E Kostiv, Oksana I Kabancova, Alexander A Tagiltcev, Svetlana N Shin
The time signature of tracheal noise in the 200-2000 Hz frequency band recorded during a forced expiratory manoeuvre (FETa) is a promising tool for diagnosis of bronchial obstructions. FETa is typically registered using a microphone with a stethoscope head placed on the neck over the trachea (stethoscope sensor). We studied basic time and spectral parameters of forced expiratory tracheal noises with a microphone placed near the mouth (lapel microphone, outside the flow of exhaled air) and compared these with measurements via stethoscope sensor, with the aim of providing patient home monitoring via standard personal computer facilities...
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29767632/reply-to-comment-on-invasive-and-noninvasive-means-of-measuring-intracranial-pressure-a-review
#3
Xuan Zhang, Joshua E Medow, Bermans J Iskandar, Fa Wang, Mehdi Shokoueinejad, Joyce Koueik, John G Webster
In their comments, Drs. De Bernardo and Rosa stated that our paper was missing several references
 related to optic nerve sheath diameter ONSD assessments. Specifically, they state that we neglected to
 mention that ultrasound has been used since the 1970s, that we did not emphasize the role of
 Standardized A scans, and they reference some of their publications in which they emphasize the
 importance of these scans in diagnosing optic nerve lesions and benign intracranial hypertension...
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29767630/characterization-of-cardiorespiratory-phase-synchronization-and-directionality-in-late-premature-and-full-term-infants
#4
Maristella Lucchini, Nicolo Pini, William P Fifer, Nina Burtchen, Maria G Signorini
OBJECTIVE: Though the mutual influence of cardiovascular and respiratory rhythms in healthy newborns has been documented, its full characterization is still pending. In general, activity of many physiological subsystems has a well expressed rhythmic character, and often an interdependency between physiological rhythms emerges early in development. Traditional methods of data analysis only address the quantification of the strength of subsystem interactions. In this work, we will investigate system interrelationships in terms of possible presence of causal or directional interplays...
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29767628/heart-rate-differences-between-symptomatic-and-asymptomatic-brugada-syndrome-patients-at-night
#5
Mireia Calvo, Virginie Le Rolle, Daniel Romero, Nathalie Behar, Pedro Gomis, Philippe Mabo, Alfredo Hernandez
Ventricular arrhythmias in Brugada syndrome (BS) mainly occur at rest, especially during nighttime, suggesting that parasympathetic activity at night may play an important role in the arrhythmogenesis of the disease. This study examined and compared the autonomic function of symptomatic and asymptomatic BS patients overnight.
 Approach: We analyzed different heart rate variability (HRV) and heart rate complexity (HRC) markers in a clinical series including 87 BS patients, where 23 were symptomatic.
 Main results: Statistically significant differences were found in MIRR, SDNN, SDANN, δSDANN and SampEn, suggesting that symptomatic patients may be related to lower heart rate variability and complexity values, as well as to greater circadian fluctuations overnight...
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29767627/comment-on-invasive-and-noninvasive-means-of-measuring-intracranial-pressure-a-review
#6
Maddalena De Bernardo, Nicola Rosa
No abstract is required for a comment.
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29726838/estimating-regions-of-air-trapping-from-electrical-impedance-tomography-data
#7
Jennifer L Mueller, Peter A Muller, Michelle Mellenthin, Rashmi Murthy, Michael Capps, Melody Alsaker, Robin Deterding, Scott D Sagel, Emily DeBoer
OBJECTIVE: Electrical impedance tomography (EIT) has been shown as a viable non-invasive, bedside imaging modality to monitor lung function.This paper introduces a method for identifying regions of air trapping from EIT data collected during tidal breathing and breath-holding maneuvers. APPROACH: Ventilation-perfusion index maps are computed from dynamic EIT images. These maps are then used to identify regions of air trapping in the area of the lung as regions that are poorly ventilated but well perfused throughout the breathing and cardiac cycles...
May 4, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29701182/wearable-technology-reveals-gait-compensations-unstable-walking-patterns-and-fatigue-in-people-with-multiple-sclerosis
#8
Michael Psarakis, David Greene, Michael H Cole, Stephen R Lord, Phu Hoang, Matthew A D Brodie
People with Multiple Sclerosis (PwMS) often experience a decline in gait performance, which can compromise their independence and increase falls. Ankle joint contractures in PwMS are common and often result in compensatory gait patterns to accommodate reduced ankle range of motion (ROM). Using advances in wearable technology, the aim of this study was to quantify head and pelvis movement patterns that occur in PwMS with disability and determine how these secondary gait compensations impact on gait stability...
April 27, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29701181/multi-frequency-difference-method-for-intracranial-hemorrhage-detection-by-magnetic-induction-tomography
#9
Zhili Xiao, Chao Tan, Feng Dong
Frequency-difference magnetic induction tomography (fdMIT) is a promising technique for continuously monitoring intracranial hemorrhage. The dual-frequency difference MIT (dfdMIT) sometimes will produce artefacts in the reconstructed images. To overcome this problem, a multi-frequency difference MIT (mfdMIT) method is proposed. 
 Approach: To test the performance of this algorithm, 2D head models comprising 6 tissue types with different size of hemorrhage were simulated, and images of hemorrhage were reconstructed by mfdMIT and dfdMIT...
April 27, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29697052/resting-state-functional-connectivity-analysis-of-the-mouse-brain-using-intrinsic-optical-signal-imaging-of-cerebral-blood-volume-dynamics
#10
Yuto Yoshida, Mitsuyuki Nakao, Norihiro Katayama
Resting-state functional connectivity (rsFC) of the human brain is closely related with neurological and psychiatric disorders. Mice are widely used to investigate the physiological mechanisms of such disorders, because of the applicability of invasive experimental techniques. Thus, studies on rsFC of the mouse brain are essential to link physiological mechanisms with these disorders in humans. In this study, we investigated the applicability of intrinsic optical signal imaging of cerebral blood volume (IOSI-CBV) for rsFC analysis of the mouse brain...
April 26, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29695645/non-invasive-measurement-of-cardiac-output-in-children-with-repaired-coarctation-of-the-aorta-using-electrical-cardiometry-compared-to-transthoracic-doppler-echocardiography
#11
Luis Altamirano-Diaz, Eva Welisch, Adam A Dempsey, Teresa Sohee Park, Michael Grattan, Kambiz Norozi
Objective
 To evaluate the equivalence of the ICON® electrical cardiometry (EC) haemodynamic monitor to measure cardiac output (CO) relative to transthoracic Doppler echocardiography (TTE) in paediatric patients with repaired coarctation of the aorta (CoA). 
 
 Approach
 A group of n=28 CoA patients and n=27 matched controls were enrolled. EC and TTE were performed synchronously on each participant and CO measurements compared using linear regression and Bland-Altman analysis...
April 26, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29693554/increase-in-random-component-of-heart-rate-variability-coinciding-with-developmental-and-degenerative-stages-of-life
#12
Junichiro Hayano, Kei Ohashi, Yutaka Yoshida, Emi Yuda, Tooru Nakamura, Ken Kiyono, Yoshiharu Yamamoto
For adapting to a new environment or situation, the biological systems explore the most convenient state while moving between attractors by the force of random fluctuation. From this concept, the random component in physiological signals is assumed to increase during developmental and degenerative stages of life. To examine this hypothesis, we measured the age-dependent changes in the random component of heart rate variability (HRV) in 24-h electrocardiography (ECG) big data and in patients with developmental disorder (DD)...
April 25, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29671754/a-review-of-physiological-and-behavioral-monitoring-with-digital-sensors-for-neuropsychiatric-illnesses
#13
Erik Reinertsen, Gari D Clifford
Physiological, behavioral, and psychological changes associated with neuropsychiatric illness are reflected in several related signals, including actigraphy, location, word sentiment, voice tone, social activity, heart rate, and responses to standardized questionnaires. These signals can be passively monitored using sensors in smartphones, wearable accelerometers, Holter monitors, and multimodal sensing approaches that fuse multiple data types. Connection of these devices to the internet has made large scale studies feasible and is enabling a revolution in neuropsychiatric monitoring...
April 19, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29667936/automated-algorithms-for-detecting-sleep-period-time-using-a-multi-sensor-pattern-recognition-activity-monitor-from-24-h-free-living-data-in-older-adults
#14
Veronica Cabanas-Sanchez, Sara Higueras-Fresnillo, Miguel Ángel De La Camara, Oscar L Veiga, David Martinez-Gomez
The aims of the present study were: (i) to develop automated algorithms to identify the sleep period time in 24-h data from the Intelligent Device for Energy Expenditure and Activity (IDEEA) in older adults, and (ii) to analyze the agreement of these algorithms to identify the sleep period time as compared to self-reported data and expert visual analysis of accelerometer raw data.
 Approach. This study comprised 50 participants, aged 65 to 85 years. Fourteen automated algorithms were developed. Participants reported their bedtime and wake time in the days wearing the device...
April 18, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29667932/fused-data-transrectal-eit-for-prostate-cancer-imaging
#15
Ethan K Murphy, Xiaotian Wu, Ryan J Halter
OBJECTIVE: Prostate cancer is a significant problem affecting 1 in 7 men. Unfortunately, the diagnostic gold-standard of ultrasound-guided biopsy misses 10-30% of all cancers. The objective of this study was to develop an Electrical Impedance Tomography (EIT) approach that has the potential to image the entire prostate using multiple impedance measurements recorded between electrodes integrated onto an end-fired transrectal ultrasound (TRUS) device and a biopsy probe (BP). APPROACH: Simulations and sensitivity analyses were used to investigate the best combination of electrodes, and measured tank experiments were used to evaluate a fused-data transrectal EIT (fd-TREIT) and BP approach...
April 18, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29664008/disentangling-respiratory-sinus-arrhythmia-in-heart-rate-variability-records
#16
Cagdas Topcu, Matthias Fruehwirth, Maximilian Moser, Michael Rosenblum, Arkady S Pikovsky
Different measures of heart rate variability and particularly of respiratory sinus arrhythmia are widely used in research and clinical
 applications. Inspired by the ideas from the theory of coupled oscillators, we use simultaneous measurements of respiratory and cardiac activity to perform a nonlinear disentanglement of the heart rate variability into the respiratory-related component and the rest. 
 We suggest to exploit the technique as a universal preprocessing tool, both for the analysis of respiratory influence on the heart rate 
 as well as in cases when effects of other factors on the heart rate variability are in focus...
April 17, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29658894/assessing-mental-stress-from-the-photoplethysmogram-a-numerical-study
#17
Peter H Charlton, Patrick Celka, Bushra Farukh, Phil Chowienczyk, Jordi Alastruey
<b>Objective:</b> Mental stress is detrimental to cardiovascular health, being a risk factor for coronary heart disease and a trigger for cardiac events. However, it is not currently routinely assessed. The aim of this study was to identify features of the photoplethysmogram (PPG) pulse wave which are indicative of mental stress.
 
 <b>Approach:</b> A numerical model of pulse wave propagation was used to simulate blood pressure signals, from which simulated PPG pulse waves were estimated using a transfer function...
April 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29658892/compact-dd-generator-based-i-in-vivo-i-neutron-activation-analysis-ivnaa-system-to-determine-sodium-concentrations-in-human-bone
#18
Mychaela Dawn Coyne, Colby R Neumann, Xinxin Zhang, Patrick Byrne, Yingzi Liu, Connie M Weaver, Linda Huiling Nie
This study presents the development of a non-invasive method for monitoring Na in human bone. Many diseases, such as hypertension and osteoporosis, are closely associated with sodium (Na) retention in the human body. Na retention is generally evaluated by calculating the difference between dietary intake and excretion. There is currently no method to directly quantify Na retained in the body. Bone is a storage for many elements, including Na, which renders bone Na an ideal biomarker to study Na metabolism and retention...
April 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29620019/a-comparison-of-probabilistic-classifiers-for-sleep-stage-classification
#19
Pedro Fonseca, Niek den Teuling, Xi Long, Ronald M Aarts
To compare conditional random fields (CRF), hidden Markov models (HMMs) and Bayesian linear discriminants (LDs) for cardiorespiratory sleep stage classification on a five-class sleep staging task (Wake/N1/N2/N3/REM), to explore the benefit of incorporating time information in the classification and to evaluate the feasibility of sleep staging on obstructive sleep apnea (OSA) patients.
 Approach: The classifiers with and without time information were evaluated with 10-fold cross-validation on five-, four- (Wake/N1+N2/N3/REM) and three-class (Wake/NREM/REM) classification tasks using a data set comprising 443 night-time polysomnography (PSG) recordings of 231 participants (180 healthy participants, 100 of which with a 'regular' sleep architecture, and 51 participants previously diagnosed with OSA)...
April 5, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29616985/recording-characteristics-of-impedance-electromyography-needle-electrodes
#20
Hyeuknam Kwon, John F Di Cristina, Seward B Rutkove, Benjamin Sanchez
OBJECTIVE: Needle EMG remains the standard clinical test for neuromuscular disease (NMD) assessment, but it only characterizes myofiber membrane depolarization. On the other hand, electrical impedance provides non-electrically active structural and compositional data of tissues. Here, we designed a prototype of needle electrode integrating impedance and EMG measurement capabilities, the so-called I-EMG needle electrode. APPROACH: We use finite element method models to study the impedance recording characteristics of I-EMG needle electrodes...
April 4, 2018: Physiological Measurement
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