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Noninvasive hemoglobin measurement

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https://www.readbyqxmd.com/read/29084012/effects-of-changes-in-arterial-carbon-dioxide-and-oxygen-partial-pressures-on-cerebral-oximeter-performance
#1
Andrew Schober, John R Feiner, Philip E Bickler, Mark D Rollins
BACKGROUND: Cerebral oximetry (cerebral oxygen saturation; ScO2) is used to noninvasively monitor cerebral oxygenation. ScO2 readings are based on the fraction of reduced and oxidized hemoglobin as an indirect estimate of brain tissue oxygenation and assume a static ratio of arterial to venous intracranial blood. Conditions that alter cerebral blood flow, such as acute changes in PaCO2, may decrease accuracy. We assessed the performance of two commercial cerebral oximeters across a range of oxygen concentrations during normocapnia and hypocapnia...
October 30, 2017: Anesthesiology
https://www.readbyqxmd.com/read/29060365/noninvasive-hemoglobin-measurement-using-unmodified-smartphone-camera-and-white-flash
#2
Edward J Wang, William Li, Junyi Zhu, Rajneil Rana, Shwetak N Patel
We show that a mobile phone can measure hemoglobin levels using the built-in RGB camera and white LED without modification. Prior work has demonstrated that a smartphone using the built-in RGB camera with the aid of visible and IR lights can achieve a Pearson correlation results between 0.69-0.82 and an RMSE value between 1.26-1.56 g/dL. Our system builds upon the prior work and demonstrates that with only the built-in white LED, the estimation of hemoglobin level has a Pearson correlation of 0.62 with an RMSE of 1...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29045955/-comparison-between-continuous-noninvasive-hemoglobin-monitoring-and-venous-blood-hemoglobin-monitoring-in-children-with-kidney-disease
#3
X Y Liu, X Q Yang, H J Xiao, J Ding
OBJECTIVE: To assess the correlation and consistency between continuous noninvasive hemoglobin detection and venous blood hemoglobin detection in children with kidney disease, and try to analyze the affecting factors. Try to provide a reference for the monitoring of hemoglobin in children with kidney disease by continuous noninvasive hemoglobin detection technique. METHODS: Eighty-five inpatient children with kidney disease, 50 boys (58.8%) and 35 girls (41.2%), aged from 3 years old to 18 years old (9...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28948164/liver-adiposity-and-metabolic-profile-in-individuals-with-chronic-spinal-cord-injury
#4
Kathleen C Rankin, Laura C O'Brien, Liron Segal, M Rehan Khan, Ashraf S Gorgey
PURPOSE: To quantify liver adiposity using magnetic resonance imaging (MRI) and to determine its association with metabolic profile in men with spinal cord injury (SCI). MATERIALS AND METHODS: MRI analysis of liver adiposity by fat signal fraction (FSF) and visceral adipose tissue (VAT) was completed on twenty participants. Intravenous glucose tolerance test was conducted to measure glucose effectiveness (Sg) and insulin sensitivity (Si). Lipid panel, fasting glucose, glycated hemoglobin (HbA1c), and inflammatory cytokines were also analyzed...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28940988/can-noninvasive-hemoglobin-measurement-reduce-the-need-for-preoperative-venipuncture-in-pediatric-outpatient-surgery
#5
Ruifeng Zeng, Christer H Svensen, Husong Li, Ximou Xu, Agneta Skoog Svanberg, Huacheng Liu, Yanrong Li, Wangning Shangguan, Qingquan Lian
BACKGROUND: Noninvasive measurements of hemoglobin in the pediatric perioperative setting could be helpful to avoid venipunctures in children. The present study aims to evaluate this by using a noninvasive device for hemoglobin determination. We compared noninvasively obtained hemoglobin with laboratory hemoglobin concentrations in children during their preoperative assessment. METHODS: In an observational study, 122 nonanemic children (age 4.2 ± 1.6 years) who were scheduled to undergo different surgical procedures under general anesthesia were included...
November 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28901214/total-dose-iron-dextran-infusion-versus-oral-iron-for-treating-iron-deficiency-anemia-in-pregnant-women-a-randomized-controlled-trial
#6
A M Darwish, E E Khalifa, E Rashad, E Farghally
STUDY OBJECTIVE: To test safety, efficacy, and cost-effectiveness of total dose infusion (TDI) of low molecular weight (LMW) iron dextran for treatment of iron deficiency anemia (IDA) during pregnancy in comparison to oral ferrous fumarate. DESIGN: Prospective interventional randomized controlled trial (RCT). Design classification. Canadian Task Force II3. SETTING: Antenatal clinic and causality unit of a tertiary care referral facility and University Hospital...
October 3, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28885215/hyperspectral-imaging-as-a-novel-diagnostic-tool-in-microcirculation-of-wounds
#7
Georg Daeschlein, Inga Langner, Thomas Wild, Sebastian von Podewils, Claudia Sicher, Thomas Kiefer, Michael Jünger
Monitoring of perfusion is a cornerstone in surgery, phlebology and basic science to proof wound healing by interventions. In chronic wound management it is of utmost importance to realize and parametrize wound bed perfusion to verify actual, and plan further treatment by noninvasive diagnostics. Up to now monitoring is based on visual inspection of wounds as conventionally practiced over more than decades. The main problems of visual inspection are the lack of standardization and comparability because of interindividual variations...
September 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28866260/spatiotemporal-optoacoustic-mapping-of-tumor-hemodynamics-in-a-clinically-relevant-orthotopic-rabbit-model-of-head-and-neck-cancer
#8
Laurie J Rich, Sandra Sexton, Leslie Curtin, Mukund Seshadri
The purpose of this study was to investigate the usefulness of photoacoustic imaging (PAI) for spatiotemporal mapping of tumor hemodynamics in a rabbit model of head and neck carcinoma. Shope cottontail rabbit papilloma virus associated VX2 carcinomas were established in adult male New Zealand White rabbits (n = 9) by surgical transplantation of tumor tissue in the neck. Noninvasive PAI with co-registered ultrasound (US) was performed to longitudinally monitor tumor growth, oxygen saturation (%sO2), and hemoglobin concentration (HbT)...
October 2017: Translational Oncology
https://www.readbyqxmd.com/read/28863662/noninvasive-hemoglobin-measurement-using-dynamic-spectrum
#9
Xiaoqing Yi, Gang Li, Ling Lin
Spectroscopy methods for noninvasive hemoglobin (Hgb) measurement are interfered by individual difference and particular weak signal. In order to address these problems, we have put forward a series of improvement methods based on dynamic spectrum (DS), including instrument design, spectrum extraction algorithm, and modeling approach. The instrument adopts light sources composed of eight laser diodes with the wavelength range from 600 nm to 1100 nm and records photoplethysmography signals at eight wavelengths synchronously...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28840157/evaluation-of-evoked-responses-to-pulse-matched-high-frequency-and-intermittent-theta-burst-transcranial-magnetic-stimulation-using-simultaneous-functional-near-infrared-spectroscopy
#10
Adrian Curtin, Junfeng Sun, Hasan Ayaz, Zhenying Qian, Banu Onaral, Jijun Wang, Shanbao Tong
Transcranial magnetic stimulation (TMS) is a noninvasive method used to excite or inhibit cortical activity for experimental, diagnostic, and therapeutic interventions. However, nonmotor regions of the brain targeted in TMS therapies, such as the dorsolateral prefrontal cortex (DLPFC), offer no extrinsic response to stimulation, resulting in a need for a practical method for the evaluation of treatment. We sought to determine the capability of a continuous-wave light emitting diodes (LED)-based functional near-infrared spectroscopy (fNIRS) system to measure evoked cortical hemoglobin changes in the DLPFC during the simultaneous application of TMS to the left-DLPFC under brief stimulation paradigms used in the clinic...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/28835022/application-of-functional-near-infrared-spectroscopy-to-the-study-of-brain-function-in-humans-and-animal-models
#11
REVIEW
Hak Yeong Kim, Kain Seo, Hong Jin Jeon, Unjoo Lee, Hyosang Lee
Functional near-infrared spectroscopy (fNIRS) is a noninvasive optical imaging technique that indirectly assesses neuronal activity by measuring changes in oxygenated and deoxygenated hemoglobin in tissues using near-infrared light. fNIRS has been used not only to investigate cortical activity in healthy human subjects and animals but also to reveal abnormalities in brain function in patients suffering from neurological and psychiatric disorders and in animals that exhibit disease conditions. Because of its safety, quietness, resistance to motion artifacts, and portability, fNIRS has become a tool to complement conventional imaging techniques in measuring hemodynamic responses while a subject performs diverse cognitive and behavioral tasks in test settings that are more ecologically relevant and involve social interaction...
August 2017: Molecules and Cells
https://www.readbyqxmd.com/read/28834598/comparison-of-noninvasive-and-invasive-point-of-care-testing-methods-with-reference-method-for-hemoglobin-measurement
#12
Gamze Avcioglu, Cemil Nural, Fatma Meriç Yilmaz, Pervin Baran, Özcan Erel, Gülsen Yilmaz
BACKGROUND: Rapid and practical point-of-care testing (POCT) devices become more popular, especially in blood donation centers for determining predonation hemoglobin (Hb) concentrations. The purpose of this study was to evaluate accordance between the POCT methods and the venous method as the reference to Hb screening. METHODS: A total of 353 subjects with no known significant health problems were included in the study. Hb screening was performed by two different POCT methods, a noninvasive method (Haemospect, MBR, Germany) and an invasive method (HemoControl, EKF Diagnostic, Germany), and a venous method as the reference (Sysmex XE-2100, Sysmex Europe, Germany)...
August 23, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28740442/techniques-used-for-the-screening-of-hemoglobin-levels-in-blood-donors-current-insights-and-future-directions
#13
REVIEW
Rajendra Chaudhary, Anju Dubey, Atul Sonker
Blood donor hemoglobin (Hb) estimation is an important donation test that is performed prior to blood donation. It serves the dual purpose of protecting the donors' health against anemia and ensuring good quality of blood components, which has an implication on recipients' health. Diverse cutoff criteria have been defined world over depending on population characteristics; however, no testing methodology and sample requirement have been specified for Hb screening. Besides the technique, there are several physiological and methodological factors that affect accuracy and reliability of Hb estimation...
2017: Journal of Blood Medicine
https://www.readbyqxmd.com/read/28721978/noninvasive-biomarkers-as-surrogate-predictors-of-clinical-and-endoscopic-remission-after-infliximab-induction-in-patients-with-refractory-ulcerative-colitis
#14
Elham A Hassan, Haidi K Ramadan, Ali A Ismael, Khaled F Mohamed, Madiha M El-Attar, Ihab Alhelali
BACKGROUND/AIMS: Treatment of refractory ulcerative colitis (UC) is a clinical challenge, and after biological therapy, monitoring clinical and endoscopic responses is fundamental. We aimed to investigate and compare the predictive power of different noninvasive parameters for clinical remission and mucosal healing after infliximab induction therapy in refractory UC patients. PATIENTS AND METHODS: Serum and fecal biomarkers, including hemoglobin, white blood cells, erythrocyte sedimentation rate, C-reactive protein (CRP), and fecal calprotectin (FC), and colonoscopy were assessed in 44 patients with refractory UC before and after (week 12) infliximab induction...
July 2017: Saudi Journal of Gastroenterology: Official Journal of the Saudi Gastroenterology Association
https://www.readbyqxmd.com/read/28623932/impact-of-glycemic-control-on-aortic-stiffness-left-ventricular-mass-and-diastolic-longitudinal-function-in-type-2-diabetes-mellitus
#15
Michaela Kozakova, Carmela Morizzo, Alan G Fraser, Carlo Palombo
BACKGROUND: Poor glycemic control is associated with impaired left ventricular (LV) diastolic function in patients with type 2 diabetes mellitus (T2DM). Inappropriate LV mass increase and accelerated aortic stiffening were suggested to participate on deterioration of diastolic function. The present study investigated the inter-relationships between glycemic control, early diastolic and systolic longitudinal velocity of mitral annulus, LV mass and aortic stiffness in T2DM patients free of cardiovascular disease and with preserved LV ejection fraction, and compared them with those observed in healthy volunteers of similar age and sex distribution...
June 17, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28601121/relationship-between-subendocardial-viability-ratio-and-hemoglobin-in-patients-with-chronic-kidney-disease
#16
Robert Ekart, Sebastjan Bevc, Nina Hojs, Tina Stropnik Galuf, Martin Hren, Benjamin Dvoršak, Maša Knehtl, Eva Jakopin, Igor Krajnc, Radovan Hojs
AIMS: Pulse wave analysis (PWA) uses the technique of applanation tonometry to obtain a peripheral pulse pressure waveform from which central hemodynamic information is derived. Using PWA, subendocardial viability ratio (SEVR) can be measured. SEVR represents a noninvasive measure of myocardial perfusion. It is related to the work of the heart, the oxygen consumption, and the energy supply of the heart. Anemia is a common complication of chronic kidney disease (CKD). A complex relationship exists between CKD, cardiovascular disease (CVD), and anemia...
2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28567284/ethnically-tibetan-women-in-nepal-with-low-hemoglobin-concentration-have-better-reproductive-outcomes
#17
Jang Ik Cho, Buddha Basnyat, Choongwon Jeong, Anna Di Rienzo, Geoff Childs, Sienna R Craig, Jiayang Sun, Cynthia M Beall
Background and objectives: Tibetans have distinctively low hemoglobin concentrations at high altitudes compared with visitors and Andean highlanders. This study hypothesized that natural selection favors an unelevated hemoglobin concentration among Tibetans. It considered nonheritable sociocultural factors affecting reproductive success and tested the hypotheses that a higher percent of oxygen saturation of hemoglobin (indicating less stress) or lower hemoglobin concentration (indicating dampened response) associated with higher lifetime reproductive success...
2017: Evolution, Medicine, and Public Health
https://www.readbyqxmd.com/read/28548465/assessment-of-infantile-hemangiomas-using-a-handheld-wireless-diffuse-optical-spectroscopic-device
#18
Christopher J Fong, Maria C Garzon, Jennifer W Hoi, Hyun K Kim, Christine T Lauren, Kimberly Morel, Lauren Geller, Nina Antonov, Nicole Weitz, June Wu, Andreas H Hielscher
BACKGROUND/OBJECTIVES: Infantile hemangiomas (IHs) are vascular tumors with the potential for significant morbidity. There is a lack of validated objective tools to assess IH severity and response to treatment. Diffuse optical spectroscopy (DOS), a noninvasive, nonionizing imaging modality, can measure total hemoglobin concentration and hemoglobin oxygen saturation in tissue to assess IH vascularity and response to treatment. Our objective was to evaluate the utility of a wireless, handheld DOS system to assess IH characteristics at selected points during their clinical course...
July 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/28533108/hyaluronidase-administered-with-xylazine-tiletamine-zolazepam-into-adipose-tissue-shortens-recovery-from-anesthesia-in-pigs
#19
Shayne P Bisetto, Adriano B Carregaro, André E S Nicolai, Thais F Bressan, William P Leal, Nathalia V Xavier, Diego F Leal, André F C Andrade
OBJECTIVE: To evaluate the effect of hyaluronidase on uptake, duration and speed of elimination of xylazine-tiletamine-zolazepam administered in the subcutaneous fat over the dorsal lumbar region of swine. STUDY DESIGN: Blinded, randomized, crossover study. ANIMALS: Six healthy Landrace/Large White pigs weighing 132±24 kg (mean±standard deviation). METHODS: Animals were administered xylazine (1 mg kg(-1)) and tiletamine-zolazepam (8 mg kg(-1)) (control treatment, CON), or xylazine-tiletamine-zolazepam at the same doses with hyaluronidase (400 IU) (treatment HYA)...
January 11, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/28526633/facial-skin-rejuvenation-by-autologous-dermal-microfat-transfer-in-photoaged-patients-clinical-evaluation-and-skin-surface-digital-profilometry-analysis
#20
Angelo Trivisonno, Alfredo Rossi, Massimo Monti, Donato Di Nunno, Christophe Desouches, Claudio Cannistra, Gabriele Toietta
Cumulative long-term exposure to solar ultraviolet radiation promotes premature skin aging characterized by wrinkle formation and reduced skin elasticity. In this study, we assessed whether microfat transfer could improve dermal and subcutaneous tissue thickness loss associated with photoaging. Twenty-one patients affected by facial photoaging (photodamage grade II-IV; age range 35-62 years; 19 females, 2 males; all of Caucasian origin) were treated using minimally invasive autologous dermal white fat transfer harvested with a recently designed microcannula...
August 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
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