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https://www.readbyqxmd.com/read/29751681/biometric-authentication-using-the-ppg-a-long-term-feasibility-study
#1
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/29624052/macroscopic-x-ray-powder-diffraction-scanning-a-new-method-for-highly-selective-chemical-imaging-of-works-of-art-instrument-optimization
#2
Frederik Vanmeert, Wout De Nolf, Steven De Meyer, Joris Dik, Koen Janssens
In the past decade macroscopic X-ray fluorescence imaging (MA-XRF) has become established as a method for the nonin-vasive investigation of flat painted surfaces, yielding large scale elemental maps. MA-XRF is limited by a lack of specificity, only allowing for indirect pigment identification based on the simultaneous presence of chemical elements. The high speci-ficity of X-ray powder diffraction (XRPD) mapping is already being exploited at synchrotron facilities for investigations at the (sub)microscopic scale, but the technique has not yet been employed using lab sources...
April 6, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29419558/monitoring-the-relationship-between-changes-in-cerebral-oxygenation-and-electroencephalography-patterns-during-cardiopulmonary-resuscitation-a-feasibility-study
#3
Elizabeth M Reagan, Robert T Nguyen, Shreyas T Ravishankar, Vikram Chabra, Barbara Fuentes, Rebecca Spiegel, Sam Parnia
OBJECTIVES: To date, no studies have examined real-time electroencephalography and cerebral oximetry monitoring during cardiopulmonary resuscitation as markers of the magnitude of global ischemia. We therefore sought to assess the feasibility of combining cerebral oximetry and electroencephalography in patients undergoing cardiopulmonary resuscitation and further to evaluate the electroencephalography patterns during cardiopulmonary resuscitation and their relationship with cerebral oxygenation as measured by cerebral oximetry...
May 2018: Critical Care Medicine
https://www.readbyqxmd.com/read/29355161/pre-and-post-ductal-oxygen-saturation-among-apparently-healthy-low-birth-weight-neonates
#4
Leo A Odudu, Beatrice N Ezenwa, Christopher I Esezobor, Ekanem N Ekure, Mathias T C Egri Okwaji, Chinyere V Ezeaka, Fidelis O Njokanma, Jejelola Ladele
INTRODUCTION: Reference values of oxygen saturation (SpO2) to guide care of low birth weight neonates have been obtained mainly from Caucasians. Data from African newborns are lacking. To determine the pre- and post-ductal SpO2values of low birth weight neonates within the first 72 h of life, compare SpO2values of moderate-late preterm and term low birth weight neonates and determine how mode of delivery affected SpO2in the first 24 h of life. METHODOLOGY: An observational descriptive study was carried out on apparently healthy low birth weight newborns weighing 1500 to ≤2499 g...
October 2017: Nigerian Postgraduate Medical Journal
https://www.readbyqxmd.com/read/28842392/clinical-validation-of-heart-rate-apps-mixed-methods-evaluation-study
#5
Thijs Vandenberk, Jelle Stans, Christophe Mortelmans, Ruth Van Haelst, Gertjan Van Schelvergem, Caroline Pelckmans, Christophe Jp Smeets, Dorien Lanssens, Hélène De Cannière, Valerie Storms, Inge M Thijs, Bert Vaes, Pieter M Vandervoort
BACKGROUND: Photoplethysmography (PPG) is a proven way to measure heart rate (HR). This technology is already available in smartphones, which allows measuring HR only by using the smartphone. Given the widespread availability of smartphones, this creates a scalable way to enable mobile HR monitoring. An essential precondition is that these technologies are as reliable and accurate as the current clinical (gold) standards. At this moment, there is no consensus on a gold standard method for the validation of HR apps...
August 25, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28833376/development-and-clinical-evaluation-of-a-new-sensor-design-for-buccal-pulse-oximetry-in-horses
#6
J K Reiners, W Rossdeutscher, K Hopster, S B R Kästner
BACKGROUND: The use of pulse oximetry in horses is limited due to inadequate readings with conventional transmission sensor probes. OBJECTIVES: The objectives of this study were to 1) develop an improved sensor design for horses to be used at an appropriate anatomical site, and 2) evaluate this design in an experimental study. STUDY DESIGN: In vivo experiment. METHODS: A new sensor design for reflectance pulse oximetry at the buccal mucosa was developed...
March 2018: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28823109/comparison-of-two-home-sleep-testing-devices-with-different-strategies-for-diagnosis-of-osa
#7
Tyler Gumb, Akosua Twumasi, Shahnaz Alimokhtari, Alan Perez, Kathleen Black, David M Rapoport, Jag Sunderram, Indu Ayappa
PURPOSE: Home sleep testing devices are being widely used in diagnosis/screening for obstructive sleep apnea (OSA). We examined differences in OSA metrics obtained from two devices with divergent home monitoring strategies, the Apnea Risk Evaluation System (ARES™, multiple signals plus forehead reflectance oximetry) and the Nonin WristOx2 ™ (single channel finger transmission pulse oximeter), compared to differences from night-night variability of OSA. METHODS: One hundred fifty-two male/26 female subjects (BMI = 30...
March 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28790805/bilateral-implantation-of-3-0-d-multifocal-toric-intraocular-lenses-results-of-a-us-food-and-drug-administration-clinical-trial
#8
Robert Lehmann, Satish Modi, Bret Fisher, Magda Michna, Michael Snyder
PURPOSE: The purpose of this study was to evaluate the clinical outcomes of apodized diffractive +3.0 D multifocal toric intraocular lens (IOL) implantations in subjects with preoperative corneal astigmatism. PATIENTS AND METHODS: This was a prospective cohort study conducted at 21 US sites. The study population consisted of 574 subjects, aged ≥21 years, with preoperative astigmatism 0.75-2.82 D, and potential postoperative visual acuity (VA) ≥0.2 logMAR, undergoing bilateral cataract removal by phacoemulsification...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28764215/comparative-evaluation-of-accuracy-of-pulse-oximeters-and-factors-affecting-their-performance-in-a-tertiary-intensive-care-unit
#9
Anupam Kumar Singh, Malvinder Singh Sahi, Bablesh Mahawar, Sajjan Rajpurohit
INTRODUCTION: Pulse oximetry is a widely used tool, unfortunately there is a paucity of data investigating its accuracy in Intensive Care Units (ICU) and if they are able to meet mandated FDA criteria as claimed by them in critically ill patients. AIM: To assess bias, precision and accuracy of pulse oximeters used in ICU and factors affecting them. MATERIALS AND METHODS: A prospective cohort study, including 129 patients admitted to the ICU of a tertiary referral centre...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28466202/four-wavelength-near-infrared-peripheral-oximetry-in-cardiac-surgery-patients-a-comparison-between-equanox-and-o3
#10
Arnaud Ferraris, Matthias Jacquet-Lagrèze, Jean-Luc Fellahi
Near-infrared spectroscopy (NIRS) is a continuous and noninvasive technology that measures regional tissue oxygen saturation (rSO2 ). A new 4-wavelength generation of NIRS monitors is now available. We aimed to compare peripheral somatic rSO2 values given by the 4-wavelength EQUANOX™ 7600 device (Nonin Medical Inc., Plymouth, Mn) and O3™ device (Masimo Corporation, Irvine, CA). Twenty adult patients scheduled for conventional elective cardiac surgery with cardiopulmonary bypass over a 4-month period were included after local Ethics Committee approval...
April 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28102878/pulmonary-hypertension-associated-with-left-sided-heart-disease
#11
REVIEW
Micha Tobias Maeder, Otto D Schoch, Rebekka Kleiner, Lucas Joerg, Daniel Weilenmann, Swiss Society For Pulmonary Hypertension
Pulmonary hypertension associated with left-sided heart disease (PH-LHD) is the most common type of pulmonary hypertension. In patients with left-sided heart disease, the presence of pulmonary hypertension is typically a marker of more advanced disease, more severe symptoms, and worse prognosis. In contrast to pulmonary arterial hypertension, PH-LHD is characterised by an elevated pulmonary artery wedge pressure (postcapillary pulmonary hypertension) without or with an additional precapillary component (isolated postcapillary versus combined postcapillary and precapillary pulmonary hypertension)...
January 19, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28086807/detection-of-critical-cerebral-desaturation-thresholds-by-three-regional-oximeters-during-hypoxia-a-pilot-study-in-healthy-volunteers
#12
COMPARATIVE STUDY
Kerry L Tomlin, Anna-Maria Neitenbach, Ulf Borg
BACKGROUND: Regional oximetry is increasingly used to monitor post-extraction oxygen status of the brain during surgical procedures where hemodynamic fluctuations are expected. Particularly in cardiac surgery, clinicians employ an interventional algorithm to restore baseline regional oxygen saturation (rSO2 ) when a patient reaches a critical desaturation threshold. Evidence suggests that monitoring cardiac surgery patients and intervening to maintain rSO2 can improve postoperative outcomes; however, evidence generated with one manufacturer's device may not be applicable to others...
January 13, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/27998824/plaque-surface-irregularity-and-calcification-length-within-carotid-plaque-predict-secondary-events-in-patients-with-coronary-artery-disease
#13
Shinichi Nonin, Shinichi Iwata, Kenichi Sugioka, Suwako Fujita, Naoki Norioka, Asahiro Ito, Masashi Nakagawa, Minoru Yoshiyama
BACKGROUND AND AIMS: Although comprehensive risk factor modification is recommended, a uniform management strategy does not necessarily prevent secondary events in patients with coronary artery disease (CAD). Therefore, identification of high-risk patients who may benefit from more intensive interventions may improve prognosis. Carotid ultrasound can reliably identify systemic atherosclerosis, and carotid plaque and intima-media thickness (IMT) are known independent risk factors for CAD...
January 2017: Atherosclerosis
https://www.readbyqxmd.com/read/26796134/four-cases-of-investigational-therapy-with-interleukin-11-against-acute-myocardial-infarction
#14
Masashi Nakagawa, Yasuko Owada, Yasukatsu Izumi, Shinichi Nonin, Kenichi Sugioka, Daisaku Nakatani, Shinichi Iwata, Kazuki Mizutani, Satoshi Nishimura, Asahiro Ito, Suwako Fujita, Takashi Daimon, Yoshiki Sawa, Masanori Asakura, Makiko Maeda, Yasushi Fujio, Minoru Yoshiyama
We describe four cases of the patients with ST-elevation myocardial infarction (STEMI) that were treated with interleukin-11 (IL-11), a cardioprotective cytokine. Recombinant human IL-11 (rhIL-11), was intravenously administered to two cases at low dose (6 µg/kg) and to two at high dose (25 µg/kg). The cytokine administration started just after the coronary occlusion was confirmed by coronary angiography (CAG), taking 3 h. Following CAG, percutaneous coronary intervention (PCI) was performed as a standard therapy...
September 2016: Heart and Vessels
https://www.readbyqxmd.com/read/25987195/near-infrared-spectroscopy-hemoglobin-index-measurement-during-fluid-challenge-a-prospective-study-in-cardiac-surgery-patients
#15
Olivier Rebet, Marc-Olivier Fischer, Guillaume Zamparini, Jean-Louis Gérard, Jean-Luc Fellahi, Jean-Luc Hanouz
OBJECTIVE: Little is known about changes in near-infrared spectroscopy-derived tissue hemoglobin index (HbI). The authors tested the hypothesis that absolute values and changes in brain hemoglobin index (HbIb) and skeletal muscle hemoglobin index (HbIm) could differ from the reference arterial hemoglobin (Hb) during fluid challenge. DESIGN: A prospective, monocenter observational study. SETTING: A 16-bed cardiac surgical intensive care unit in a teaching university hospital...
August 2015: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/25887259/increase-in-cerebral-oxygenation-during-advanced-life-support-in-out-of-hospital-patients-is-associated-with-return-of-spontaneous-circulation
#16
Cornelia Genbrugge, Ingrid Meex, Willem Boer, Frank Jans, René Heylen, Bert Ferdinande, Jo Dens, Cathy De Deyne
INTRODUCTION: By maintaining sufficient cerebral blood flow and oxygenation, the goal of cardiopulmonary resuscitation (CPR) is to preserve the pre-arrest neurological state. To date, cerebral monitoring abilities during CPR have been limited. Therefore, we investigated the time-course of cerebral oxygen saturation values (rSO₂) during advanced life support in out-of-hospital cardiac arrest. Our primary aim was to compare rSO₂ values during advanced life support from patients with return of spontaneous circulation (ROSC) to patients who did not achieve ROSC...
March 24, 2015: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/25777922/increase-in-cerebral-oxygenation-during-advanced-life-support-in-out-of-hospital-patients-is-associated-with-return-of-spontaneous-circulation
#17
Cornelia Genbrugge, Ingrid Meex, Willem Boer, Frank Jans, René Heylen, Bert Ferdinande, Jo Dens, Cathy De Deyne
INTRODUCTION: By maintaining sufficient cerebral blood flow and oxygenation, the goal of cardiopulmonary resuscitation (CPR) is to preserve the pre-arrest neurological state. To date, cerebral monitoring abilities during CPR have been limited. Therefore, we investigated the time-course of cerebral oxygen saturation values (rSO2) during advanced life support in out-of-hospital cardiac arrest. Our primary aim was to compare rSO2 values during advanced life support from patients with return of spontaneous circulation (ROSC) to patients who did not achieve ROSC...
December 2015: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/25649718/evaluation-of-near-infrared-spectroscopy-under-apnea-dependent-hypoxia-in-humans
#18
Lars Eichhorn, Felix Erdfelder, Florian Kessler, Jonas Doerner, Marcus O Thudium, Rainer Meyer, Richard K Ellerkmann
In this study we investigated the responsiveness of near-infrared spectroscopy (NIRS) recordings measuring regional cerebral tissue oxygenation (rSO2) during hypoxia in apneic divers. The goal was to mimic dynamic hypoxia as present during cardiopulmonary resuscitation, laryngospasm, airway obstruction, or the "cannot ventilate cannot intubate" situation. Ten experienced apneic divers performed maximal breath hold maneuvers under dry conditions. SpO2 was measured by Masimo™ pulse oximetry on the forefinger of the left hand...
December 2015: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/25286829/monitoring-of-cerebral-oxygen-saturation-during-resuscitation-in-out-of-hospital-cardiac-arrest-a-feasibility-study-in-a-physician-staffed-emergency-medical-system
#19
Jens-Christian Schewe, Marcus O Thudium, Jochen Kappler, Folkert Steinhagen, Lars Eichhorn, Felix Erdfelder, Ulrich Heister, Richard Ellerkmann
BACKGROUND: Despite recent advances in resuscitation algorithms, neurological injury after cardiac arrest due to cerebral ischemia and reperfusion is one of the reasons for poor neurological outcome. There is currently no adequate means of measuring cerebral perfusion during cardiac arrest. It was the aim of this study to investigate the feasibility of measuring near infrared spectroscopy (NIRS) as a potential surrogate parameter for cerebral perfusion in patients with out-of-hospital resuscitations in a physician-staffed emergency medical service...
2014: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
https://www.readbyqxmd.com/read/25280485/study-protocol-for-the-phantom-study-prehospital-assessment-of-noninvasive-tissue-oximetry-monitoring
#20
Andrew Weatherall, Alan Garner, Nigel Lovell, Stephen Redmond, Anna Lee, Justin Skowno, Jonathan Egan
BACKGROUND: Traumatic brain injury is a major cause of mortality and morbidity worldwide. It can be worsened by secondary injury particularly with hypoxia or hypotension. Current prehospital guidelines emphasise regular measurement of peripheral oxygen saturation and blood pressure but there is no monitor in use to provide direct information relating to blood flow or oxygen delivery to the brain tissue. This prospective cohort study will assess the utility of near-infrared spectroscopy monitoring in prehospital medicine in demonstrating injury, pathophysiology and associations with long-term functional outcomes...
2014: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
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