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Photoplethysmogram

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https://www.readbyqxmd.com/read/29777849/non-invasive-diagnostic-methods-for-better-screening-of-peripheral-arterial-disease
#1
REVIEW
Neelamshobha Nirala, R Periyasamy, Awanish Kumar
BACKGROUND: Peripheral arterial disease (PAD) is a common circulatory problem in which narrowed arteries reduce blood flow to extremities usually legs. It does not receive enough blood flow to keep up with demand. This causes symptoms, most notably leg pain while walking which is known as claudication. It is a common manifestation of type II Diabetes, but the relationship between other vascular diseases and lower limb (LL)-PAD has been poorly understood and investigated. METHODS: When assessing a patient with clinically LLPAD, two questions are in order to establish a diagnosis: one is non-invasive testing and other is invasive...
May 16, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29751681/biometric-authentication-using-the-ppg-a-long-term-feasibility-study
#2
Jorge Sancho, Álvaro Alesanco, José García
The photoplethysmogram (PPG) is a biomedical signal that can be used to estimate volumetric blood flow changes in the peripheral circulation. During the past few years, several works have been published in order to assess the potential for PPGs to be used in biometric authentication systems, but results are inconclusive. In this paper we perform an analysis of the feasibility of using the PPG as a realistic biometric alternative in the long term. Several feature extractors (based on the time domain and the Karhunen⁻Loève transform) and matching metrics (Manhattan and Euclidean distances) have been tested using four different PPG databases (PRRB, MIMIC-II, Berry, and Nonin)...
May 11, 2018: Sensors
https://www.readbyqxmd.com/read/29750114/profiling-the-propagation-of-error-from-ppg-to-hrv-features-in-a-wearable-physiological-monitoring-device
#3
Davide Morelli, Leonardo Bartoloni, Michele Colombo, David Plans, David A Clifton
Wearable physiological monitors are becoming increasingly commonplace in the consumer domain, but in literature there exists no substantive studies of their performance when measuring the physiology of ambulatory patients. In this Letter, the authors investigate the reliability of the heart-rate (HR) sensor in an exemplar 'wearable' wrist-worn monitoring system (the Microsoft Band 2 ); their experiments quantify the propagation of error from (i) the photoplethysmogram (PPG) acquired by pulse oximetry, to (ii) estimation of HR, and (iii) subsequent calculation of HR variability (HRV) features...
April 2018: Healthcare Technology Letters
https://www.readbyqxmd.com/read/29740088/cuffless-blood-pressure-estimation-using-only-a-smartphone
#4
Kenta Matsumura, Peter Rolfe, Sogo Toda, Takehiro Yamakoshi
Cuffless blood pressure (BP) measurement is an all-inclusive term for a method that aims to measure BP without using a cuff. Recent cuffless technology has made it possible to estimate BP with reasonable accuracy. However, mainstream methods require an electrocardiogram and photoplethysmogram measurements, and frequent calibration procedures using a cuff sphygmomanometer. We therefore developed a far simpler cuffless method, using only heart rate (HR) and modified normalized pulse volume (mNPV) that can be measured using a smartphone, based on the knowledge that ln BP = ln cardiac output (CO) + ln total peripheral resistance (TPR), where CO and TPR are correlated with HR and mNPV, respectively...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29714722/an-optimal-filter-for-short-photoplethysmogram-signals
#5
Yongbo Liang, Mohamed Elgendi, Zhencheng Chen, Rabab Ward
A photoplethysmogram (PPG) contains a wealth of cardiovascular system information, and with the development of wearable technology, it has become the basic technique for evaluating cardiovascular health and detecting diseases. However, due to the varying environments in which wearable devices are used and, consequently, their varying susceptibility to noise interference, effective processing of PPG signals is challenging. Thus, the aim of this study was to determine the optimal filter and filter order to be used for PPG signal processing to make the systolic and diastolic waves more salient in the filtered PPG signal using the skewness quality index...
May 1, 2018: Scientific Data
https://www.readbyqxmd.com/read/29658894/assessing-mental-stress-from-the-photoplethysmogram-a-numerical-study
#6
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/29614802/associations-between-job-strain-and-arterial-stiffness-a-large-survey-among-enterprise-employees-from-thailand
#7
Orawan Kaewboonchoo, Grace Sembajwe, Jian Li
As an intermediate endpoint to cardiovascular disease, arterial stiffness has received much attention recently. So far, the research on work stress and arterial stiffness is still sparse and inconsistent, and no investigations on work stress and cardiovascular health among the Thai working population have been reported. Therefore, we conducted an epidemiological study among 2141 Thai enterprise employees (858 men and 1283 women) who were free from any diagnosed cardiovascular disease. Work stress was measured using Karasek's Job Demand-Control model for job strain (a combination of high demand and low control)...
April 2, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29534495/toward-generating-more-diagnostic-features-from-photoplethysmogram-waveforms
#8
Mohamed Elgendi, Yongbo Liang, Rabab Ward
Photoplethysmogram (PPG) signals collected using a pulse oximeter are increasingly being used for screening and diagnosis purposes. Because of the non-invasive, cost-effective, and easy-to-use nature of the pulse oximeter, clinicians and biomedical engineers are investigating how PPG signals can help in the management of many medical conditions, especially for global health application. The study of PPG signal analysis is relatively new compared to research in electrocardiogram signals, for instance; however, we anticipate that in the near future blood pressure, cardiac output, and other clinical parameters will be measured from wearable devices that collect PPG signals, based on the signal's vast potential...
March 11, 2018: Diseases (Basel)
https://www.readbyqxmd.com/read/29485624/a-new-short-recorded-photoplethysmogram-dataset-for-blood-pressure-monitoring-in-china
#9
Yongbo Liang, Zhencheng Chen, Guiyong Liu, Mohamed Elgendi
Open clinical trial data provide a valuable opportunity for researchers worldwide to assess new hypotheses, validate published results, and collaborate for scientific advances in medical research. Here, we present a health dataset for the non-invasive detection of cardiovascular disease (CVD), containing 657 data segments from 219 subjects. The dataset covers an age range of 20-89 years and records of diseases including hypertension and diabetes. Data acquisition was carried out under the control of standard experimental conditions and specifications...
February 27, 2018: Scientific Data
https://www.readbyqxmd.com/read/29449663/quantitative-evaluation-of-pain-during-electrocutaneous-stimulation-using-a-log-linearized-peripheral-arterial-viscoelastic-model
#10
Hiroki Matsubara, Hiroki Hirano, Harutoyo Hirano, Zu Soh, Ryuji Nakamura, Noboru Saeki, Masashi Kawamoto, Masao Yoshizumi, Atsuo Yoshino, Takafumi Sasaoka, Shigeto Yamawaki, Toshio Tsuji
In clinical practice, subjective pain evaluations, e.g., the visual analogue scale and the numeric rating scale, are generally employed, but these are limited in terms of their ability to detect inaccurate reports, and are unsuitable for use in anesthetized patients or those with dementia. We focused on the peripheral sympathetic nerve activity that responds to pain, and propose a method for evaluating pain sensation, including intensity, sharpness, and dullness, using the arterial stiffness index. In the experiment, electrocardiogram, blood pressure, and photoplethysmograms were obtained, and an arterial viscoelastic model was applied to estimate arterial stiffness...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29319536/new-photoplethysmogram-indicators-for-improving-cuffless-and-continuous-blood-pressure-estimation-accuracy
#11
Wan-Hua Lin, Hui Wang, Oluwarotimi Williams Samuel, Gengxing Liu, Zhen Huang, Guanglin Li
OBJECTIVE: The accuracy of cuffless and continuous blood pressure (BP) estimation has been improved, but it is still unsatisfactory for clinical uses. This study was designed to further increase BP estimation accuracy. APPROACH: In this study, a number of new indicators were extracted from photoplethysmogram (PPG) recordings and a linear regression method was used to construct BP estimation models based on the PPG indicators and pulse transit time (PTT). The performance of the BP estimation models was evaluated by the PPG recordings from 22 subjects when they performed mental arithmetic stress and Valsalva's manoeuvre tasks that could induce BP fluctuations...
February 26, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29301261/detection-of-craving-for-gaming-in-adolescents-with-internet-gaming-disorder-using-multimodal-biosignals
#12
Hodam Kim, Jihyeon Ha, Won-Du Chang, Wanjoo Park, Laehyun Kim, Chang-Hwan Im
The increase in the number of adolescents with internet gaming disorder (IGD), a type of behavioral addiction is becoming an issue of public concern. Teaching adolescents to suppress their craving for gaming in daily life situations is one of the core strategies for treating IGD. Recent studies have demonstrated that computer-aided treatment methods, such as neurofeedback therapy, are effective in relieving the symptoms of a variety of addictions. When a computer-aided treatment strategy is applied to the treatment of IGD, detecting whether an individual is currently experiencing a craving for gaming is important...
January 1, 2018: Sensors
https://www.readbyqxmd.com/read/29214150/the-physiocam-a-novel-non-contact-sensor-to-measure-heart-rate-variability-in-clinical-and-field-applications
#13
Maria I Davila, Gregory F Lewis, Stephen W Porges
Heart rate variability (HRV) is a reliable indicator of health status and a sensitive index of autonomic stress reactivity. Stress negatively affects physical and psychological wellness by decreasing cardiovascular health and reducing quality of life. Wearable sensors have made it possible to track HRV during daily activity, and recent advances in mobile technology have reduced the cost and difficulty of applying this powerful technique. Although advances have made sensors smaller and lighter, some burden on the subject remains...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/29200023/large-artery-dysfunction-in-primary-antiphospholipid-syndrome
#14
Gilmar S Osmundo, Jozélio Freire Carvalho, Luiz A Bortolotto, Vilma S T Viana, Eloisa Bonfá
OBJECTIVE: The aim of this study was to assess the arterial distensibility of large vessels and changes in microvasculature in primary antiphospholipid syndrome. METHODS: Twenty-two antiphospholipid syndrome (APL) patients and 66 age-, sex-, height-, and blood pressure-matched controls were evaluated. Second derivative of the finger photoplethysmogram (SDPTG) was used as a noninvasive method to evaluate the pulse wave. The b/a and d/a indices, which reflect, respectively, large-vessel and small-vessel properties, were calculated from the SDPTG waveform components...
January 2018: Journal of Clinical Rheumatology: Practical Reports on Rheumatic & Musculoskeletal Diseases
https://www.readbyqxmd.com/read/29159698/analysis-of-biosignals-during-immersion-in-computer-games
#15
Mina Yeo, Seokbeen Lim, Gilwon Yoon
The number of computer game users is increasing as computers and various IT devices in connection with the Internet are commonplace in all ages. In this research, in order to find the relevance of behavioral activity and its associated biosignal, biosignal changes before and after as well as during computer games were measured and analyzed for 31 subjects. For this purpose, a device to measure electrocardiogram, photoplethysmogram and skin temperature was developed such that the effect of motion artifacts could be minimized...
November 17, 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/29124562/video-based-heart-rate-monitoring-across-a-range-of-skin-pigmentations-during-an-acute-hypoxic-challenge
#16
Paul S Addison, Dominique Jacquel, David M H Foo, Ulf R Borg
The robust monitoring of heart rate from the video-photoplethysmogram (video-PPG) during challenging conditions requires new analysis techniques. The work reported here extends current research in this area by applying a motion tolerant algorithm to extract high quality video-PPGs from a cohort of subjects undergoing marked heart rate changes during a hypoxic challenge, and exhibiting a full range of skin pigmentation types. High uptimes in reported video-based heart rate (HRvid) were targeted, while retaining high accuracy in the results...
November 9, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29082070/angle-selective-optical-filter-for-highly-sensitive-reflection-photoplethysmogram
#17
Chan-Sol Hwang, Sung-Pyo Yang, Kyung-Won Jang, Jung-Woo Park, Ki-Hun Jeong
We report an angle-selective optical filter (ASOF) for highly sensitive reflection photoplethysmography (PPG) sensors. The ASOF features slanted aluminum (Al) micromirror arrays embedded in transparent polymer resin, which effectively block scattered light under human tissue. The device microfabrication was done by using geometry-guided resist reflow of polymer micropatterns, polydimethylsiloxane replica molding, and oblique angle deposition of thin Al film. The angular transmittance through the ASOF is precisely controlled by the angle of micromirrors...
October 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29068403/a-robust-dynamic-heart-rate-detection-algorithm-framework-during-intense-physical-activities-using-photoplethysmographic-signals
#18
Jiajia Song, Dan Li, Xiaoyuan Ma, Guowei Teng, Jianming Wei
Dynamic accurate heart-rate (HR) estimation using a photoplethysmogram (PPG) during intense physical activities is always challenging due to corruption by motion artifacts (MAs). It is difficult to reconstruct a clean signal and extract HR from contaminated PPG. This paper proposes a robust HR-estimation algorithm framework that uses one-channel PPG and tri-axis acceleration data to reconstruct the PPG and calculate the HR based on features of the PPG and spectral analysis. Firstly, the signal is judged by the presence of MAs...
October 25, 2017: Sensors
https://www.readbyqxmd.com/read/29064457/detection-of-stress-levels-from-biosignals-measured-in-virtual-reality-environments-using-a-kernel-based-extreme-learning-machine
#19
Dongrae Cho, Jinsil Ham, Jooyoung Oh, Jeanho Park, Sayup Kim, Nak-Kyu Lee, Boreom Lee
Virtual reality (VR) is a computer technique that creates an artificial environment composed of realistic images, sounds, and other sensations. Many researchers have used VR devices to generate various stimuli, and have utilized them to perform experiments or to provide treatment. In this study, the participants performed mental tasks using a VR device while physiological signals were measured: a photoplethysmogram (PPG), electrodermal activity (EDA), and skin temperature (SKT). In general, stress is an important factor that can influence the autonomic nervous system (ANS)...
October 24, 2017: Sensors
https://www.readbyqxmd.com/read/29060948/biosignal-integrated-circuit-with-simultaneous-acquisition-of-ecg-and-ppg-for-wearable-healthcare-applications
#20
Hyungseup Kim, Yunjong Park, Youngwoon Ko, Yeongjin Mun, Sangmin Lee, Hyoungho Ko
BACKGROUND: Wearable healthcare systems require measurements from electrocardiograms (ECGs) and photoplethysmograms (PPGs), and the blood pressure of the user. The pulse transit time (PTT) can be calculated by measuring the ECG and PPG simultaneously. Continuous-time blood pressure without using an air cuff can be estimated by using the PTT. OBJECTIVE: This paper presents a biosignal acquisition integrated circuit (IC) that can simultaneously measure the ECG and PPG for wearable healthcare applications...
October 13, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
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