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https://www.readbyqxmd.com/read/28213189/is-heart-rate-variability-hrv-an-adequate-tool-for-evaluating-human-emotions-a-focus-on-the-use-of-the-international-affective-picture-system-iaps
#1
Kwang-Ho Choi, Junbeom Kim, O Sang Kwon, Min Ji Kim, Yeon Hee Ryu, Ji-Eun Park
Because human emotion varies greatly among individuals and is a qualitative factor, measuring it with any degree of accuracy is very difficult. Heart rate variability (HRV), which is used in evaluations of the autonomic nervous system (ANS), is used to evaluate human emotions. This study examines the validity of HRV as a tool to evaluate emotions using the International Affective Picture System (IAPS). For experimentation, five photos were selected for each of the categories of "happy," "unhappy", and "neutral" from among the images provided by the IAPS...
February 11, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28212327/a-robust-random-forest-based-approach-for-heart-rate-monitoring-using-photoplethysmography-signal-contaminated-by-intense-motion-artifacts
#2
Yalan Ye, Wenwen He, Yunfei Cheng, Wenxia Huang, Zhilin Zhang
The estimation of heart rate (HR) based on wearable devices is of interest in fitness. Photoplethysmography (PPG) is a promising approach to estimate HR due to low cost; however, it is easily corrupted by motion artifacts (MA). In this work, a robust approach based on random forest is proposed for accurately estimating HR from the photoplethysmography signal contaminated by intense motion artifacts, consisting of two stages. Stage 1 proposes a hybrid method to effectively remove MA with a low computation complexity, where two MA removal algorithms are combined by an accurate binary decision algorithm whose aim is to decide whether or not to adopt the second MA removal algorithm...
February 16, 2017: Sensors
https://www.readbyqxmd.com/read/28212075/towards-photoplethysmography-based-estimation-of-instantaneous-heart-rate-during-physical-activity
#3
Delaram Jarchi, Alex Casson
OBJECTIVE: Recently numerous methods have been proposed for estimating average heart rate using photoplethysmography (PPG) during physical activity, overcoming the significant interference that motion causes in PPG traces. We propose a new algorithm framework for extracting instantaneous heart rate from wearable PPG and ECG signals to provide an estimate of heart rate variability during exercise. METHODS: For ECG signals we propose a new spectral masking approach which modifies a particle filter tracking algorithm, and for PPG signals constrains the instantaneous frequency obtained from the Hilbert transform to a region of interest around a candidate heart rate measure...
February 13, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28195689/non-swelling-click-crosslinked-gelatin-and-peg-hydrogels-with-tunable-properties-using-pluronic-linkers
#4
Vinh X Truong, Kelly M Tsang, John S Forsythe
Swelling of hydrogels leads to a decrease in mechanical performance coupled with complications in solute diffusion. In addition, hydrogel swelling affects patient safety in biomedical applications such as compression of tissue and fluid blockage. A conventional strategy for suppressing swelling is to introduce a thermoresponsive polymer with a lower critical solution temperature (LCST) within the network structure to counter the water uptake at elevated temperature. However, altering the gels mechanical strength via modification of the network structure often affects the water uptake behavior and thus a non-swelling platform with tunable mechanical properties suitable for various biomedical applications is desirable...
February 14, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28194981/droplet-assisted-inlet-ionization-for-online-analysis-of-airborne-nanoparticles
#5
Andrew J Horan, Michael J Apsokardu, Murray V Johnston
Airborne nanoparticles play a key role in climate effects as well as impacting human health. Their small mass and complex chemical composition represent significant challenges for analysis. This work introduces a new ionization method, droplet assisted inlet ionization (DAII), where aqueous droplets are produced from airborne nanoparticles. When these droplets enter the mass spectrometer through a heated inlet, rapid vaporization leads to the formation of molecular ions. The method is demonstrated with test aerosols consisting of polypropylene glycol (PPG), angiotensin II, bovine serum albumin, and the "thermometer" compound p-methoxybenzylpyridinium chloride...
January 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28188240/lixisenatide-therapy-in-older-patients-with-type-2-diabetes-inadequately-controlled-on-their-current-antidiabetic-treatment-the-getgoal-o-randomized-trial
#6
Graydon S Meneilly, Christine Roy-Duval, Hasan Alawi, George Dailey, Diego Bellido, Carlos Trescoli, Helard Manrique Hurtado, Hailing Guo, Valerie Pilorget, Riccardo Perfetti, Hamish Simpson
OBJECTIVE: To evaluate the efficacy and safety of lixisenatide versus placebo on glycemic control in older patients with type 2 diabetes uncontrolled on their current antidiabetic treatment. RESEARCH DESIGN AND METHODS: In this phase III, double-blind, randomized, placebo-controlled, two-arm, parallel-group, multicenter trial, patients aged ≥70 years were randomized to receive once-daily lixisenatide 20 μg or placebo before breakfast concomitantly with their existing antidiabetic therapy (including insulin) for 24 weeks...
February 10, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28185634/usefulness-of-a-noninvasive-device-to-identify-elevated-left-ventricular-filling-pressure-using-finger-photoplethysmography-during-a-valsalva-maneuver
#7
Panagis Galiatsatos, Theingi Tiffany Win, Jennifer Monti, Peter V Johnston, William Herzog, Jeffrey C Trost, Chao-Wei Hwang, Gene Y Fridman, Nae-Yuh Wang, Harry A Silber
The high rate of re-hospitalization for heart failure might be reduced by improving noninvasive techniques for identifying elevated left ventricular (LV) filling pressure. We previously showed that changes in a finger photoplethysmography (PPG) waveform during the Valsalva maneuver (VM) reflect invasively measured LV end-diastolic pressure (LVEDP). We have since developed a hand-held device that analyzes PPG while guiding the expiratory effort of a VM. Here we assessed the sensitivity and specificity of this device for identifying elevated LVEDP in patients...
January 5, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28169836/photoplethysmography-sampling-frequency-pilot-assessment-of-how-low-can-we-go-to-analyze-pulse-rate-variability-with-reliability
#8
Ahyoung Choi, Hangsik Shin
Pulse rate variability (PRV) analysis appears as the first alternative to heart rate variability analysis for wearable devices; however, there is a constraint on computational load and energy consumption for the limited system resources available to the devices. Considering that adjustment of the sampling frequency is one of the strategies for reducing computational load and power consumption, this study aimed to investigate the influence of sampling frequency (fs) on PRV analysis and to find the minimum sampling frequency while maintaining reliability...
February 7, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28169086/basal-insulin-treatment-intensification-in-patients-with-type-2-diabetes-mellitus-a-comprehensive-systematic-review-of-current-options
#9
REVIEW
D Raccah
AIM: As type 2 diabetes mellitus progresses, most patients require treatment with basal insulin in combination with another agent to achieve recommended glycaemic targets. The purpose of this systematic review was to examine the evidence supporting the use of the available add-on treatments [rapid-acting insulin (RAI), glucagon-like peptide-1 receptor agonists (GLP-1 RAs), dipeptidyl peptidase (DPP)-4 inhibitors and sodium-glucose cotransporter-2 (SGLT-2) inhibitors] to basal insulin...
February 3, 2017: Diabetes & Metabolism
https://www.readbyqxmd.com/read/28166774/highly-wearable-cuff-less-blood-pressure-and-heart-rate-monitoring-with-single-arm-electrocardiogram-and-photoplethysmogram-signals
#10
Qingxue Zhang, Dian Zhou, Xuan Zeng
BACKGROUND: Long-term continuous systolic blood pressure (SBP) and heart rate (HR) monitors are of tremendous value to medical (cardiovascular, circulatory and cerebrovascular management), wellness (emotional and stress tracking) and fitness (performance monitoring) applications, but face several major impediments, such as poor wearability, lack of widely accepted robust SBP models and insufficient proofing of the generalization ability of calibrated models. METHODS: This paper proposes a wearable cuff-less electrocardiography (ECG) and photoplethysmogram (PPG)-based SBP and HR monitoring system and many efforts are made focusing on above challenges...
February 6, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28156454/evaluating-the-prognostic-effect-of-a-pain-classification-system-in-patients-with-advanced-cancer
#11
Kimberson Cochien Tanco, Ali Haider, Courtney Maligi, Minjeong Park, Diane D Liu, Eduardo Bruera
: 95 Background: The Edmonton Classification System for Cancer Pain (ECS-CP) has been shown to predict pain management complexity based on five features: pain mechanism, incident pain, psychological distress, addictive behavior, and cognitive function. The main objective of our study was to explore the association between increasing sum of negative ECS-CP features and achievement of good pain control at first follow up visit at an outpatient palliative care clinic. METHODS: Initial and follow up clinical information of 409 eligible supportive care outpatients such as patient demographics, ECS-CP assessment, morphine equivalent daily dose (MEDD), opioid rotation, Edmonton Symptom Assessment Score (ESAS), and personalized pain goal (PPG) were retrospectively reviewed and analyzed...
October 9, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28130679/in-vivo-investigation-of-ear-canal-pulse-oximetry-during-hypothermia
#12
K Budidha, P A Kyriacou
Pulse oximeters rely on the technique of photoplethysmography (PPG) to estimate arterial oxygen saturation (SpO[Formula: see text]). In conditions of poor peripheral perfusion such as hypotension, hypothermia, and vasoconstriction, the PPG signals detected are often weak and noisy, or in some cases unobtainable. Hence, pulse oximeters produce erroneous SpO[Formula: see text] readings in these circumstances. The problem arises as most commercial pulse oximeter probes are designed to be attached to peripheral sites such as the finger or toe, which are easily affected by vasoconstriction...
January 27, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28130066/timing-affects-measurement-of-portal-pressure-gradient-after-placement-of-transjugular-intrahepatic-porto-systemic-shunts-in-patients-with-portal-hypertension
#13
Gilberto Silva-Junior, Fanny Turon, Anna Baiges, Eira Cerda, Ángeles García-Criado, Annabel Blasi, Ferran Torres, Virginia Hernandez-Gea, Jaume Bosch, Juan Carlos Garcia-Pagan
BACKGROUND & AIMS: A reduction in portal pressure gradient (PPG) to below 12 mmHg after placement of a transjugular intrahepatic porto-systemic shunt (TIPS) correlates with the absence of further bleeding or ascites at follow-up examinations of patients with cirrhosis. The PPG is usually measured immediately after placement of the TIPS, when different circumstances can affect PPG values - this could affect determination of risk for decompensation. We investigated variations in PPG measurements collected at different time points after TIPS, aiming to identify a time point after which PPG values were best maintained...
January 24, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28118069/rationale-for-treatment-options-for-mealtime-glucose-control-in-patients-with-type-2-diabetes
#14
Stephen L Aronoff
While glycemic control is routinely assessed using HbA1c and fasting glucose measures, postprandial glucose (PPG) is also an important contributor of overall glycemia. Furthermore, PPG excursions have been linked to complications of diabetes. This review examines the effects of glucose-lowering therapies (including treatments administered at mealtime) on postprandial hyperglycemia in patients with type 2 diabetes. A PubMed search was conducted to identify clinical studies of treatments for mealtime glucose control in type 2 diabetes...
January 24, 2017: Postgraduate Medicine
https://www.readbyqxmd.com/read/28117542/the-additional-dose-of-insulin-for-high-protein-mixed-meal-provides-better-glycemic-control-in-children-with-type-1-diabetes-on-insulin-pumps-randomized-cross-over-study
#15
Katarzyna Piechowiak, Katarzyna Dżygało, Agnieszka Szypowska
BACKGROUND: Delivery of insulin for high-protein low-fat meals with carbohydrates on the basis of carbohydrates leads to higher late postprandial glycemia. Studies with mixed meals demonstrated lower blood glucose level after dual wave bolus. The objective of our study was to assess the impact of additional dose of insulin in dual wave bolus for high-protein mixed meal on the postprandial glycemia. MATERIALS AND METHODS: We performed a randomized, double-blind, two-way cross-over study, including 58 children with type 1 diabetes, aged 14...
January 24, 2017: Pediatric Diabetes
https://www.readbyqxmd.com/read/28115821/insulin-detemir-in-combination-with-oral-antidiabetic-drugs-improves-glycemic-control-in-persons-with-type-2-diabetes-in-near-east-countries-results-from-the-lebanese-subgroup
#16
Akram Echtay, Emile Andari, Paola Atallah, Roland Moufarrege, Rita Nemr
OBJECTIVE: To evaluate the effectiveness and safety of insulin detemir treatment as add-on therapy in a real-world setting of Lebanese insulin naïve persons, with type 2 diabetes poorly controlled on oral antidiabetic drugs (OADs). METHODS: Our study was a prospective, observational study representing the Lebanese arm of the multinational prospective and observational study involving 2,155 persons across Near East countries, Lebanon, Pakistan, Israel and Jordan...
January 19, 2017: Ethnicity & Disease
https://www.readbyqxmd.com/read/28113791/a-robust-motion-artifact-detection-algorithm-for-accurate-detection-of-heart-rates-from-photoplethysmographic-signals-using-time-frequency-spectral-features
#17
Duy Dao, S M A Salehizadeh, Yeon Noj, Jo Woon Chong, Chae Cho, Dave Mcmanus, Chad E Darling, Yitzhak Mendelson, Ki H Chon
Motion and noise artifacts (MNAs) impose limits on the usability of the photoplethysmogram (PPG), particularly in the context of ambulatory monitoring. MNAs can distort PPG, causing erroneous estimation of physiological parameters such as heart rate (HR) and arterial oxygen saturation (SpO2). In this study we present a novel approach, "TifMA," based on using the Time-frequency spectrum of PPG to first detect the MNA-corrupted data and next discard the non-usable part of the corrupted data. The term "non-usable" refers to segments of PPG data from which the HR signal cannot be recovered accurately...
October 21, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28113527/a-chair-based-unobtrusive-cuffless-blood-pressure-monitoring-system-based-on-pulse-arrival-time
#18
Zunyi Tang, Toshiyo Tamura, Masaki Sekine, Alex Huang, Wenxi Chen, Masaki Yoshida, Kaoru Sakatani, Hiroshi Kobayashi, Shigehiko Kanaya
In this paper, we present an unobtrusive cuffless BP monitoring system based on pulse arrival time (PAT) for facilitating long-term home BP monitoring. The proposed system consists of an electrocardiograph (ECG), a photoplethysmograph (PPG), and a control circuit with a Bluetooth module, all of which are mounted on a common armchair to measure ECG and PPG signals from users while sitting on the armchair in order to calculate continuous PAT. Considering the good linear correlation of systolic BP (SBP) and the non-linear correlation of diastolic BP (DBP) with PAT, a new BP estimation method was proposed...
October 4, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28113332/bio-witel-a-low-power-integrated-wireless-telemetry-system-for-healthcare-applications-in-401-406-mhz-band-of-medradio-spectrum
#19
Abhishek Srivastava, Nithin Sankar, Baibhab Chatterjee, Devarshi Das, Meraj Ahmad, Rakesh Kukkundoor, Vivek Saraf, Ananthpadmanabhan Jayachandran, Dinesh Sharma, Maryam Baghini
This paper presents a low power integrated wireless telemetry system (Bio-WiTel) for healthcare applications in 401- 406 MHz frequency band of Medical Device RadioCommunication (MedRadio) spectrum. In this work, necessary design considerations for telemetry system for short range (upto 3 m) communication of bio-signals are presented. These considerations greatly help in taking important design decisions, which eventually lead to a simple, low power, robust and reliable wireless system implementation. Transmitter (TX) and receiver (RX) of Bio-WiTel system have been fabricated in 180 nm mixed mode CMOS technology...
December 14, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28113245/algorithmic-principles-of-remote-ppg
#20
Wenjin Wang, Albertus den Brinker, Sander Stuijk, Gerard de Haan
This paper introduces a mathematical model that incorporates the pertinent optical and physiological properties of skin reflections with the objective to increase our understanding of the algorithmic principles behind multi-wavelength remote photoplethysmography (rPPG). The model is used to explain the different choices that were made in existing rPPG methods for pulse extraction. The understanding that comes from the model can be used to design robust or application-specific rPPG solutions. We illustrate this by the design of an alternative rPPG method where a projection plane orthogonal to the skin-tone is used for pulse extraction...
September 13, 2016: IEEE Transactions on Bio-medical Engineering
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