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https://www.readbyqxmd.com/read/28337439/a-brief-review-of-non-invasive-monitoring-of-respiratory-condition-for-extubated-patients-with-or-at-risk-for-obstructive-sleep-apnea-after-surgery
#1
REVIEW
Xuezheng Zhang, Mahmoud Attia Mohamed Kassem, Ying Zhou, Muhammad Shabsigh, Quanguang Wang, Xuzhong Xu
Obstructive sleep apnea (OSA) is one of the important risk factors contributing to postoperative airway complications. OSA alters the respiratory physiology and increases the sensitivity of muscle tone of the upper airway after surgery to residual anesthetic medication. In addition, the prevalence of OSA was reported to be much higher among surgical patients than the general population. Therefore, appropriate monitoring to detect early respiratory impairment in postoperative extubated patients with possible OSA is challenging...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28325023/an-affordable-cuff-less-blood-pressure-estimation-solution
#2
Monika Jain, Niranjan Kumar, Sujay Deb
This paper presents a cuff-less hypertension pre-screening device that non-invasively monitors the Blood Pressure (BP) and Heart Rate (HR) continuously. The proposed device simultaneously records two clinically significant and highly correlated biomedical signals, viz., Electrocardiogram (ECG) and Photoplethysmogram (PPG). The device provides a common data acquisition platform that can interface with PC/laptop, Smart phone/tablet and Raspberry-pi etc. The hardware stores and processes the recorded ECG and PPG in order to extract the real-time BP and HR using kernel regression approach...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324990/indirect-measurement-of-the-carotid-arterial-pressure-from-vibrocardiographic-signal-calibration-of-the-waveform-and-comparison-with-photoplethysmographic-signal
#3
L Casacanditella, G Cosoli, S Casaccia, E P Tomasini, L Scalise
The detection of arterial Blood Pressure waveform provides important information about the subject health status. Laser Doppler Vibrometry (LDV) is a non-contact technique with high sensitivity able to detect mechanical movements of the arterial wall; several previous studies have shown that LDV is able to characterize cardiac activity. Photoplethysmogram (PPG) quantifies the digital volume artery pulse, which has been demonstrated to be closely related to the pressure signal measured by an arterial tonometer...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324969/a-clinical-study-of-short-term-sternal-photoplethysmography-recordings-from-patients-with-obstructive-airways-diseases
#4
Shadi S Chreiteh, Dorthe B Saadi, Bo Belhage, Nassim Nabipour, Karsten Hoppe, Erik V Thomsen
Traditionally, measurements of the oxygen saturation (SpO2) has been confound to the extremities. In this study, we therefore investigated the possibility for reliable estimation of clinically relevant SpO2 levels from photoplethysmography (PPG) obtained on the sternum of patients with obstructive airway diseases. We initiated the study with a calibration of a prototype sternal PPG sensor. In accordance with the ISO 80601-2-61:2011 guidelines, the calibration was conducted as a controlled desaturation study...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324937/data-driven-estimation-of-blood-pressure-using-photoplethysmographic-signals
#5
Shi Chao Gao, Peter Wittek, Li Zhao, Wen Jun Jiang
Noninvasive measurement of blood pressure by optical methods receives considerable interest, but the complexity of the measurement and the difficulty of adjusting parameters restrict applications. We develop a method for estimating the systolic and diastolic blood pressure using a single-point optical recording of a photoplethysmographic (PPG) signal. The estimation is data-driven, we use automated machine learning algorithms instead of mathematical models. Combining supervised learning with a discrete wavelet transform, the method is insensitive to minor irregularities in the PPG waveform, hence both pulse oximeters and smartphone cameras can record the signal...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324936/a-preliminary-study-on-multi-wavelength-ppg-based-pulse-transit-time-detection-for-cuffless-blood-pressure-measurement
#6
Jing Liu, Yuan-Ting Zhang, Xiao-Rong Ding, Wen-Xuan Dai, Ni Zhao
Pulse transit time (PTT) has been widely studied as an index of blood pressure (BP) changes. In recent years, some prototypes of PTT-based wearable BP measurement devices have been developed, which can relieve users from the discomfort caused by the inflating cuff used in auscultatory and oscillometric BP measurement techniques. However, in the common practice for PTT detection, multi-site sensor implementation on human body is required, making it difficult for the integration of wearable devices. Since multi-wavelength (MW) photoplethysmogram (PPG) signals carry blood pulsation information of different blood vessels embedded in different skin depths, the time difference between different wavelength PPG signals collected at the same body site can be treated as a special PTT on a short length of blood vessels beneath the skin...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324935/photoplethysmography-towards-a-non-invasive-pressure-measurement-technique
#7
H Njoum, P A Kyriacou
There is a need for non-invasive and continuous blood pressure measurements. This study explored the relationship between Photoplethysmography (PPG) and Pressure-Volume (P-V) changes in an in vitro model. We proposed and compared methods for an estimation of the pulsatile volume, termed as Normalized Pulse Volume (NPV) and Adjusted Pulse Volume (APV). To validate the methods, pressure, Red (R) and InfraRed (IR) PPG signals were recorded continuously in an arterial model utilizing a pulsatile pump. Flow rates were controlled by varying pumping frequencies at low and high stroke volumes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28314484/impact-of-health-policy-and-practice-on-finding-the-best-fit-for-patients-with-type-2-diabetes-after-metformin-failure-croatian-pilot-study
#8
Maja Cigrovski Berković, Davorka Herman Mahečić, Marina Gradišer, Ines Bilić-Ćurčić
AIM: We assessed the impact of clinical practice and health policy on the choice and efficacy of different second-line therapies for the treatment of type 2 diabetes (T2DM) after failure of metformin. METHODS: This retrospective database analysis included 200 patients with a follow-up period of 6 months. The primary end-point was achievement of HbA1c <7% and fasting (FBG) and postprandial glucose levels (PPG) <7.2mmol/L and <10mmol/L, respectively after three and six months of different add-on treatments...
March 14, 2017: Primary Care Diabetes
https://www.readbyqxmd.com/read/28304374/continuous-transport-of-pacific-derived-anthropogenic-radionuclides-towards-the-indian-ocean
#9
Daniela Pittauer, Stephen G Tims, Michaela B Froehlich, L Keith Fifield, Anton Wallner, Steven D McNeil, Helmut W Fischer
Unusually high concentrations of americium and plutonium have been observed in a sediment core collected from the eastern Lombok Basin between Sumba and Sumbawa Islands in the Indonesian Archipelago. Gamma spectrometry and accelerator mass spectrometry data together with radiometric dating of the core provide a high-resolution record of ongoing deposition of anthropogenic radionuclides. A plutonium signature characteristic of the Pacific Proving Grounds (PPG) dominates in the first two decades after the start of the high yield atmospheric tests in 1950's...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303626/lixisenatide-as-add-on-treatment-among-patients-with-different-%C3%AE-cell-function-levels-as-assessed-by-homa-%C3%AE-index
#10
Riccardo C Bonadonna, Lawrence Blonde, Mikhail Antsiferov, Rachele Berria, Pierre Gourdy, Mensud Hatunic, Viswanathan Mohan, Michael Horowitz
BACKGROUND: The effect of lixisenatide - a prandial once-daily glucagon-like peptide-1 receptor agonist - on glycaemic control in patients with inadequately controlled type 2 diabetes (T2DM), stratified by baseline β-cell function was assessed. METHODS: The 24-week GetGoal-M, -P and -S trials evaluated the efficacy and safety of lixisenatide in combination with oral antidiabetic agents. This post hoc analysis used data from patients receiving lixisenatide in these trials, divided into matched cohorts by propensity scoring and stratified according to baseline homeostasis model assessment of β-cell function (HOMA-β) index levels (high HOMA-β: > median HOMA-β [28...
March 17, 2017: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/28300460/smartphone-based-photoplethysmographic-imaging-for-heart-rate-monitoring
#11
Maha Alafeef
The purpose of this study is to make use of visible light reflected mode photoplethysmographic (PPG) imaging for heart rate (HR) monitoring via smartphones. The system uses the built-in camera feature in mobile phones to capture video from the subject's index fingertip. The video is processed, and then the PPG signal resulting from the video stream processing is used to calculate the subject's heart rate. Records from 19 subjects were used to evaluate the system's performance. The HR values obtained by the proposed method were compared with the actual HR...
March 16, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/28296645/extraction-of-respiratory-signals-from-the-electrocardiogram-and-photoplethysmogram-technical-and-physiological-determinants
#12
Peter H Charlton, Timothy Bonnici, Lionel Tarassenko, Jordi Alastruey, David Clifton, Richard Beale, Peter Watkinson
Breathing rate (BR) can be estimated by extracting respiratory signals from the electrocardiogram (ECG) or photoplethysmogram (PPG). The extracted respiratory signals may be influenced by several technical and physiological factors. In this study, our aim was to determine how technical and physiological factors influence the quality of respiratory signals. Using a variety of techniques 15 respiratory signals were extracted from the ECG, and 11 from PPG signals collected from 57 healthy subjects. The quality of each respiratory signal was assessed by calculating its correlation with a reference oral-nasal pressure respiratory signal using Pearson's correlation coefficient...
March 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28290720/comparison-of-heart-rate-variability-recording-with-smart-phone-photoplethysmographic-polar-h7-chest-strap-and-electrocardiogram-methods
#13
Daniel J Plews, Ben Scott, Marco Altini, Matt Wood, Andrew E Kilding, Paul B Laursen
PURPOSE: To establish the validity of smartphone photoplethysmography (PPG) and heart rate sensor in the measurement of heart rate variability (HRV). METHODS: 29 healthy subjects were measured at rest during 5 min of guided breathing (GB) and normal breathing (NB) using Smartphone PPG, heart rate chest strap and electrocardiography (ECG). The root mean sum of the squared differences between R-R intervals (rMSSD) was determined from each device. RESULTS: Compared to ECG, the technical error of estimate (TEE) was acceptable for all conditions (average TEE CV% (90% CI) = 6...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28288955/resting-and-postexercise-heart-rate-detection-from-fingertip-and-facial-photoplethysmography-using-a-smartphone-camera-a-validation-study
#14
Bryan P Yan, Christy Ky Chan, Christien Kh Li, Olivia Tl To, William Hs Lai, Gary Tse, Yukkee C Poh, Ming-Zher Poh
BACKGROUND: Modern smartphones allow measurement of heart rate (HR) by detecting pulsatile photoplethysmographic (PPG) signals with built-in cameras from the fingertips or the face, without physical contact, by extracting subtle beat-to-beat variations of skin color. OBJECTIVE: The objective of our study was to evaluate the accuracy of HR measurements at rest and after exercise using a smartphone-based PPG detection app. METHODS: A total of 40 healthy participants (20 men; mean age 24...
March 13, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28287994/ensemble-empirical-mode-decomposition-with-principal-component-analysis-a-novel-approach-for-extracting-respiratory-rate-and-heart-rate-from-photoplethysmographic-signal
#15
Mohammod Abdul Motin, Chandan Karmakar, Marimuthu Palaniswami
The photoplethysmographic (PPG) signal measures the local variations of blood volume in tissues, reflecting the peripheral pulse modulated by cardiac activity, respiration and other physiological effects. Therefore, PPG can be used to extract the vital cardiorespiratory signals like heart rate (HR), and respiratory rate (RR) and this will reduce the number of sensors connected to the patient's body for recording these vital signs. In this paper, we propose an algorithm based on ensemble empirical mode decomposition with principal component analysis (EEMD-PCA) as a novel approach to estimate HR and RR simultaneously from PPG signal...
March 7, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28287428/an-experimental-study-of-the-effects-of-external-physiological-parameters-on-the-photoplethysmography-signals-in-the-context-of-local-blood-pressure-hydrostatic-pressure-changes
#16
Hongwei Yuan, Sven Poeggel, Thomas Newe, Elfed Lewis, Charusluk Viphavakit, Gabriel Leen
A comprehensive study of the effect of a wide range of controlled human subject motion on Photoplethysmographic signals is reported. The investigation includes testing of two separate groups of 5 and 18 subjects who were asked to undertake set exercises whilst simultaneously monitoring a wide range of physiological parameters including Breathing Rate, Heart Rate and Localised Blood Pressure using commercial clinical sensing systems. The unique finger mounted PPG probe equipped with miniature three axis accelerometers for undertaking this investigation was a purpose built in-house version which is designed to facilitate reproducible application to a wide range of human subjects and the study of motion...
March 10, 2017: Sensors
https://www.readbyqxmd.com/read/28285203/flexible-heartbeat-sensor-for-wearable-device
#17
Yeon Hwa Kwak, Wonhyo Kim, Kwang Bum Park, Kunnyun Kim, Sungkyu Seo
We demonstrate a flexible strain-gauge sensor and its use in a wearable application for heart rate detection. This polymer-based strain-gauge sensor was fabricated using a double-sided fabrication method with polymer and metal, i.e., polyimide and nickel-chrome. The fabrication process for this strain-gauge sensor is compatible with the conventional flexible printed circuit board (FPCB) processes facilitating its commercialization. The fabricated sensor showed a linear relation for an applied normal force of more than 930 kPa, with a minimum detectable force of 6...
March 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28278454/accurate-wearable-heart-rate-monitoring-during-physical-exercises-using-ppg
#18
Andriy Temko
OBJECTIVE: The challenging task of heart rate (HR) estimation from the photoplethysmographic (PPG) signal, during intensive physical exercises is tackled in this paper. METHODS: The study presents a detailed analysis of a novel algorithm (WFPV) that exploits a Wiener filter to attenuate the motion artifacts, a phase vocoder to refine the HR estimate and user-adaptive postprocessing to track the subject physiology. Additionally, an offline version of the HR estimation algorithm that uses Viterbi decoding is designed for scenarios that do not require online HR monitoring (WFPV+VD)...
March 1, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28278453/living-skin-classification-via-remote-ppg
#19
Wenjin Wang, Sander Stuijk, Gerard de Haan
Detecting living-skin tissue in a video on the basis of induced color changes due to blood pulsation is emerging for automatic region of interest localization in remote photoplethysmography (rPPG). However, the state-of-the-art method performing unsupervised living-skin detection in a video is rather time-consuming, which is mainly due to the high complexity of its unsupervised on-line learning for pulse/noise separation. In this paper, we address this issue by proposing a fast living-skin classification method...
March 1, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28277813/power-optimisation-for-wearable-heart-rate-measurement-device-with-wireless-charging
#20
G Kiruthiga, A Sharmila, P Mahalakshmi, M Muruganandam
Continuous measurement of heart rate is necessary for monitoring the patients with heart ailments. A wearable which continuously measures heart rate of an individual by a method called reflectance-based photoplethysmography (PPG) computes the heart rate of an individual according to the volumetric changes in blood flowing through the body is developed. In order to make the device more compact as well as with IP67 and IP68 standard, wireless charging technique is employed because it helps to get rid of wires while charging...
March 9, 2017: Journal of Medical Engineering & Technology
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