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https://www.readbyqxmd.com/read/28227934/effect-of-embedding-dimension-on-complexity-measures-in-identifying-arrhythmia
#1
Radhagayathri K Udhayakumar, Chandan Karmakar, Peng Li, Marimuthu Palaniswami, Radhagayathri K Udhayakumar, Chandan Karmakar, Peng Li, Marimuthu Palaniswami, Marimuthu Palaniswami, Radhagayathri K U Udhayakumar, Peng Li, Chandan Karmakar
Entropy measures like Approximate entropy (ApEn) and Sample entropy (SampEn) are well established tools to analyze Heart Rate Variability (HRV) data. Critical parameters involved in these computations namely embedding dimension m and tolerance r are in most cases assumed to be 2 and 0.2*signal SD (standard devaition) respectively. Such assumptions do not work fairly across data sets and thus create misleading results in many cases. Problems with r have been addressed with the advent of newer entropy measures like Permutation entropy (PE), Fuzzy entropy (FuzzyEn) and Distribution entropy (DistEn) that simply eliminate, modify or replace r from calculations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227932/influence-of-embedding-dimension-on-distribution-entropy-in-analyzing-heart-rate-variability
#2
Radhagayathri K Udhayakumar, Chandan Karmakar, Peng Li, Marimuthu Palaniswami, Radhagayathri K Udhayakumar, Chandan Karmakar, Peng Li, Marimuthu Palaniswami, Marimuthu Palaniswami, Radhagayathri K Udhayakumar, Peng Li, Chandan Karmakar
Distribution entropy (DistEn) is a recent measure of complexity that is used to analyze Heart Rate Variability (HRV) data. DistEn which is a function of data length N, number of bins M and embedding dimension m is known to be stable and consistent with respect to parameters N and M respectively. Also, (N, M) are known to have a combined effect in deciding performance of DistEn as a classification feature. But, all such analysis have mostly ignored the influence of the third parameter m on DistEn properties...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227887/hip-joint-geometry-effects-on-cartilage-contact-stresses-during-a-gait-cycle
#3
Hui-Hui Wu, Dong Wang, An-Bang Ma, Dong-Yun Gu, Hui-Hui Wu, Dong Wang, An-Bang Ma, Dong-Yun Gu, An-Bang Ma, Dong-Yun Gu, Hui-Hui Wu, Dong Wang
The cartilage surface geometry of natural human hip joint is commonly regarded as sphere. It has been widely applied in computational simulation and hip joint prosthesis design. Some new geometry models have been developed and the sphere assumption has been questioned recently. The objective of this study was to analyze joint geometry effects on cartilage contact stress distribution and investigate contact patterns during a whole gait cycle. Hip surface was reconstructed from CT data of a healthy volunteer...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227498/effects-of-the-choice-of-reference-on-the-selectivity-of-a-multi-contact-nerve-cuff-electrode
#4
Ryan G L Koh, Jose Zariffa, Ryan G L Koh, Jose Zariffa, Jose Zariffa, Ryan G L Koh
Tripolar referencing is typically used in nerve cuff electrode recordings due to its ability to maximize the signal-to-noise ratio of contacts at the centre, but this may not be the optimal choice for a multi-contact nerve cuff consisting of contacts in off-centre rings. We conducted a simulation study to compare the effects of 3 different reference types on the recording selectivity of a multi-contact nerve cuff: the tripolar reference (TPR), common average reference (CAR), and multiple tripolar references based on consecutive groups of 3 rings (cTPR)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227458/study-of-phase-estimation-methods-to-analyse-cardiorespiratory-synchronization-in-osa-patients
#5
Jordi Sola-Soler, Beatriz F Giraldo, Jose A Fiz, Raimon Jane, Jordi Sola-Soler, Beatriz F Giraldo, Jose A Fiz, Raimon Jane, Beatriz F Giraldo, Raimon Jane, Jose A Fiz, Jordi Sola-Soler
Obstructive Sleep Apnea (OSA) is a sleep disorder highly prevalent in the general population. Cardiorespiratory Phase Synchronization (CRPS) is a form of non-linear interaction between respiratory and cardiovascular systems that was found to be reduced in severe OSA patients. The Hilbert Transform (HT) method was the recommended choice for estimating the respiratory phase in CRPS studies. But we have noticed that HT provides a phase that is aligned to the transition between the exhalation and the inhalation parts of different breathing cycles, instead of being aligned to the breathing onsets...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227241/changes-in-st-qt-and-rr-ecg-intervals-during-acute-stress-in-firefighters-a-pilot-study
#6
Joana S Paiva, Susana Rodrigues, Joao Paulo Silva Cunha, Joana S Paiva, Susana Rodrigues, Joao Paulo Silva Cunha, Susana Rodrigues, Joana S Paiva
Firefighting is a stressful occupation. The monitoring of psychophysiological measures in those professionals can be a way to prevent and early detect cardiac diseases and other stress-related problems. The current study aimed to assess morphological changes in the ECG signal induced by acute stress. A laboratory protocol was conducted among 6 firefighters, including a laboratory stress-inducer task - the Trier Social Stress Task (TSST) - and a 2-choice reaction time task (CRTT) that was performed before (CRTT1) and after (CRTT2) the stress condition...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227218/effect-of-wearable-sensor-dynamics-on-physical-activity-estimates-a-comparison-between-sci-vs-healthy-individuals
#7
C Jayaraman, C K Mummidisetty, A Jayaraman, C Jayaraman, C K Mummidisetty, A Jayaraman, C K Mummidisetty, A Jayaraman, C Jayaraman
Accuracy of physical activity estimates predicted by activity monitoring technologies may be affected by device location, analysis algorithms, type of technology (i.e. wearable/stickable) and population demographics (disability) being studied. Consequently, the main purpose of this investigation was to study such sensor dynamics (i.e. effect of device location, type and population demographics on energy expenditure estimates) of two commercial activity monitors. It was hypothesized that device location, population studied (disability), choice of proprietary algorithm and type of technology used will significantly impact the accuracy of the predicted physical activity metrics...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227195/a-new-regression-based-method-for-the-eye-blinks-artifacts-correction-in-the-eeg-signal-without-using-any-eog-channel
#8
Gianluca Di Flumeri, Pietro Arico, Gianluca Borghini, Alfredo Colosimo, Fabio Babiloni, Gianluca Di Flumeri, Pietro Arico, Gianluca Borghini, Alfredo Colosimo, Fabio Babiloni, Gianluca Di Flumeri, Gianluca Borghini, Pietro Arico, Fabio Babiloni, Alfredo Colosimo
Eye blinks artifacts correction in the EEG signal is a best practice in many applications. Nowadays, different approaches can be used to overcome such an issue: the most used methods are based on regression techniques and Independent Component Analysis. It is not clear which is the best performing method, thus the choice of which method to adopt depends on the specific application, on the basis of the method limitations. In fact, on one hand the regression-based methods require at least one EOG channel, and are affected by the mutual contamination between EEG and EOG signals...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227179/influence-of-electrode-configuration-on-the-electric-field-distribution-during-transcutaneous-spinal-direct-current-stimulation-of-the-cervical-spine
#9
Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, Mamede A de Carvalho, Pedro C Miranda, Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, Mamede A de Carvalho, Pedro C Miranda, Sofia R Fernandes, Pedro C Miranda, Cornelia Wenger, Ricardo Salvador, Mamede A de Carvalho
Transcutaneous spinal direct current stimulation (tsDCS) is a recent technique with promising neuromodulatory effects on spinal neuronal circuitry. The main objective of the present study was to perform a finite element analysis of the electric field distribution in tsDCS in the cervical spine region, with varying electrode configurations and geometry. A computational model of a human trunk was generated with nine tissue meshes. Three electrode configurations were tested: A) rectangular saline-soaked sponge target and return electrodes placed over C3 and T3 spinous processes, respectively; B1) circular saline-soaked sponge target and return electrodes placed over C7 spinous process and right deltoid muscle, respectively; B2) same configuration as B1, considering circular shaped electrodes with sponge and rubber layers and a small circular connector on the top surface...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227131/sound-preference-test-in-animal-models-of-addicts-and-phobias
#10
Ryo Soga, Tomoyo I Shiramatsu, Ryohei Kanzaki, Hirokazu Takahashi, Ryo Soga, Tomoyo I Shiramatsu, Ryohei Kanzaki, Hirokazu Takahashi, Tomoyo I Shiramatsu, Ryohei Kanzaki, Ryo Soga, Hirokazu Takahashi
Biased or too strong preference for a particular object is often problematic, resulting in addiction and phobia. In animal models, alternative forced-choice tasks have been routinely used, but such preference test is far from daily situations that addicts or phobic are facing. In the present study, we developed a behavioral assay to evaluate the preference of sounds in rodents. In the assay, several sounds were presented according to the position of free-moving rats, and quantified the sound preference based on the behavior...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227130/verification-of-a-research-prototype-for-hemodynamic-analysis-of-cerebral-aneurysms
#11
Takashi Suzuki, Cosmin Ioan Nita, Saikiran Rapaka, Hiroyuki Takao, Viorel Mihalef, Soichiro Fujimura, Chihebeddine Dahmani, Puneet Sharma, Hiroya Mamori, Toshihiro Ishibashi, Thomas Redel, Makoto Yamamoto, Yuichi Murayama, Takashi Suzuki, Cosmin Ioan Nita, Saikiran Rapaka, Hiroyuki Takao, Viorel Mihalef, Soichiro Fujimura, Chihebeddine Dahmani, Puneet Sharma, Hiroya Mamori, Toshihiro Ishibashi, Thomas Redel, Makoto Yamamoto, Yuichi Murayama, Cosmin Ioan Nita, Puneet Sharma, Hiroya Mamori, Soichiro Fujimura, Thomas Redel, Saikiran Rapaka, Chihebeddine Dahmani, Toshihiro Ishibashi, Makoto Yamamoto, Viorel Mihalef, Takashi Suzuki, Hiroyuki Takao, Yuichi Murayama
Owing to its clinical importance, there has been a growing body of research on understanding the hemodynamics of cerebral aneurysms. Traditionally, this work has been performed using general-purpose, state-of-the-art commercial solvers. This has meant requiring engineering expertise for making appropriate choices on the geometric discretization, time-step selection, choice of boundary conditions etc. Recently, a CFD research prototype has been developed (Siemens Healthcare GmbH, Prototype - not for diagnostic use) for end-to-end analysis of aneurysm hemodynamics...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226951/generating-physically-realistic-kinematic-and-dynamic-models-from-small-data-sets-an-application-for-sit-to-stand-actions
#12
Robert Peter Matthew, Victor Shia, Gentiane Venture, Ruzena Bajcsy, Robert Peter Matthew, Victor Shia, Gentiane Venture, Ruzena Bajcsy, Robert Peter Matthew, Gentiane Venture, Victor Shia, Ruzena Bajcsy
Kinematic and dynamic models are used to create simplified, yet accurate representations of reality. In application to biological systems, there is often a choice on what level of complexity is appropriate for the model. This paper introduces a structured method for obtaining an accurate model that can represent the sit-to-stand motion and reproduce the associated contact forces in the standing phase. These models are generated from small datasets, just five measured sit-to-stand actions, and result in simple, physically realisable dynamic models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226850/the-effect-of-inter-electrode-distance-on-the-electric-field-distribution-during-transcutaneous-lumbar-spinal-cord-direct-current-stimulation
#13
Rui Bastos, Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, Mamede A de Carvalho, Pedro C Miranda, Rui Bastos, Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, Mamede A de Carvalho, Pedro C Miranda, Pedro C Miranda, Rui Bastos, Cornelia Wenger, Ricardo Salvador, Mamede A de Carvalho, Sofia R Fernandes
Previous studies have indicated potential neuromodulation of the spinal circuitry by transcutaneous spinal direct current stimulation (tsDCS), such as changes in motor unit recruitment, shortening of the peripheral silent period and interference with supraspinal input to lower motor neurons. All of these effects were dependent on the polarity of the electrodes. The present study investigates how the distance between the electrodes during tsDCS influences the electric field's (E-field) spatial distribution in the lumbar and sacral spinal cord (SC)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226706/3-d-registration-on-carotid-artery-imaging-data-mri-for-different-timesteps
#14
Paschalis A Bizopoulos, Antonis Sakellarios, Lampros K Michalis, Dimitrios D Koutsouris, Dimitrios I Fotiadis, Paschalis A Bizopoulos, Antonis Sakellarios, Lampros K Michalis, Dimitrios D Koutsouris, Dimitrios I Fotiadis, Lampros K Michalis, Dimitrios D Koutsouris, Antonis Sakellarios, Dimitrios I Fotiadis, Paschalis A Bizopoulos
A common problem which is faced by the researchers when dealing with arterial carotid imaging data is the registration of the geometrical structures between different imaging modalities or different timesteps. The use of the "Patient Position" DICOM field is not adequate to achieve accurate results due to the fact that the carotid artery is a relatively small structure and even imperceptible changes in patient position and/or direction make it difficult. While there is a wide range of simple/advanced registration techniques in the literature, there is a considerable number of studies which address the geometrical structure of the carotid artery without using any registration technique...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226570/a-wearable-signal-acquisition-system-for-physiological-signs-including-throat-ppg
#15
Yizhou Zhong, Yun Pan, Ling Zhang, Kwang-Ting Cheng, Yizhou Zhong, Yun Pan, Ling Zhang, Kwang-Ting Cheng, Yizhou Zhong, Ling Zhang, Kwang-Ting Cheng, Yun Pan
This paper presents a wearable signal acquisition system, which can measure physiological signs, i.e., electrocardiogram (ECG) and photoplethysmogram (PPG). The system is comprised of two parts: (1) an ECG sensor implemented in the master board which will be mounted on the chest and, (2) a combined PPG and motion sensor implemented in the slave board which will be worn around the neck area. The single-lead ECG, the single-channel PPG, and the 3-channel accelerometer signals are all sampled at 200Hz, and transmitted to an Android app through Bluetooth® low energy (BLE) in real time...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226501/selecting-the-optimal-movement-subset-with-different-pattern-recognition-based-emg-control-algorithms
#16
Ali H Al-Timemy, Rami N Khushaba, Javier Escudero, Ali H Al-Timemy, Rami N Khushaba, Javier Escudero, Javier Escudero, Rami N Khushaba, Ali H Al-Timemy
Pattern Recognition (PR)-based EMG controllers of multi-functional upper-limb prostheses have been recently deployed on commercial state-of-the-art prostheses, offering intuitive control with the ability to control large number of movements with fast reaction time. Current challenges with such PR systems include the lack of training and deployment protocols that can help optimize the system's performance based on amputees' needs. Selecting the best subset of movements that each individual amputee can perform will help to exclude movements that have poor performance so that a subject-specific training can be achieved...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226219/dietary-inflammatory-index-and-odds-of-colorectal-cancer-in-a-case-control-study-from-jordan
#17
Nitin Shivappa, James R Hébert, Susan E Steck, Lorne J Hofseth, Ihab Shehadah, Kamal E Bani-Hani, Tareq Al-Jaberi, Majed Al-Nusairr, Dennis Heath, Reema Tayyem
BACKGROUND: Dietary components that promote inflammation of the colon have been suggested to be risk factors in the development of colorectal cancer (CRC). The possible link between inflammatory potential of diet and CRC has been investigated in several developed or Western countries. Despite the fact that dietary choices in the Middle East differ markedly from those in the West, results have not been reported from any study conducted in a Middle-Eastern population. We examined the association between dietary inflammatory index (DII)TM scores and CRC in a case-control study conducted in Jordan...
February 22, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28225958/recurrence-rate-of-basal-cell-carcinoma-with-positive-histopathological-margins-and-related-risk-factors
#18
Fernanda Lara, Jesus Rodriguez Santamaría, Luiz Eduardo Fabricio de Melo Garbers
BACKGROUND: The best way to approach surgically removed basal cell carcinoma with positive histopathological margins is a controversial issue. Some authors believe that the more appropriate treatment is an immediate reoperation while others prefer a periodic follow up. The rates of recurrence are variable in literature, between 10% and 67%. OBJECTIVE: To define the recurrence rate of basal cell carcinoma with positive margins after surgery. Secondarily, identify morphological aspects that can suggest a more frequent tumoral recurrence...
January 2017: Anais Brasileiros de Dermatologia
https://www.readbyqxmd.com/read/28225816/bayesian-prediction-of-placebo-analgesia-in-an-instrumental-learning-model
#19
Won-Mo Jung, Ye-Seul Lee, Christian Wallraven, Younbyoung Chae
Placebo analgesia can be primarily explained by the Pavlovian conditioning paradigm in which a passively applied cue becomes associated with less pain. In contrast, instrumental conditioning employs an active paradigm that might be more similar to clinical settings. In the present study, an instrumental conditioning paradigm involving a modified trust game in a simulated clinical situation was used to induce placebo analgesia. Additionally, Bayesian modeling was applied to predict the placebo responses of individuals based on their choices...
2017: PloS One
https://www.readbyqxmd.com/read/28225736/effects-of-long-term-musical-training-on-cortical-auditory-evoked-potentials
#20
Carolyn J Brown, Eun-Kyung Jeon, Virginia Driscoll, Bruna Mussoi, Shruti Balvalli Deshpande, Kate Gfeller, Paul J Abbas
OBJECTIVE: Evidence suggests that musicians, as a group, have superior frequency resolution abilities when compared with nonmusicians. It is possible to assess auditory discrimination using either behavioral or electrophysiologic methods. The purpose of this study was to determine if the acoustic change complex (ACC) is sensitive enough to reflect the differences in spectral processing exhibited by musicians and nonmusicians. DESIGN: Twenty individuals (10 musicians and 10 nonmusicians) participated in this study...
March 2017: Ear and Hearing
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