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Noninvasive hemoglobin measurement

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https://www.readbyqxmd.com/read/28221201/influence-of-fraction-of-inspired-oxygen-on-noninvasive-hemoglobin-measurement-parallel-assessment-of-2-monitors
#1
Etienne Gayat, Nicolas Imbert, Ariane Roujansky, Léa Lemasle, Marc Fischler
BACKGROUND: Previous reports have brought specific attention to the relationship between oxygenation of the patient and the accuracy of noninvasive measurement of hemoglobin (Hb) using an optical sensor. This study aimed to assess prospectively the relationship between fraction of inspired oxygen (FIO2) and the bias of the measurement of Hb by the use of 2 different noninvasive monitors compared with the classic invasive technique. METHODS: Forty-four patients were included prospectively...
February 17, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28208170/optical-coherence-tomographic-angiography-in-type-2-diabetes-and-diabetic-retinopathy
#2
Daniel Shu Wei Ting, Gavin Siew Wei Tan, Rupesh Agrawal, Yasuo Yanagi, Nicole Ming Sie, Chee Wai Wong, Ian Yew San Yeo, Shu Yen Lee, Chui Ming Gemmy Cheung, Tien Yin Wong
Importance: Optical coherence tomographic angiography (OCT-A) is able to visualize retinal microvasculature without the need for injection of fluorescein contrast dye. Nevertheless, it is only able to capture a limited view of macula and does not show leakage. Objectives: To evaluate the retinal microvasculature using OCT-A in patients with type 2 diabetes as well as the association of OCT-A characteristics with diabetic retinopathy (DR) and systemic risk factors...
February 16, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28169313/visualization-of-tumor-related-blood-vessels-in-human-breast-by-photoacoustic-imaging-system-with-a-hemispherical-detector-array
#3
M Toi, Y Asao, Y Matsumoto, H Sekiguchi, A Yoshikawa, M Takada, M Kataoka, T Endo, N Kawaguchi-Sakita, M Kawashima, E Fakhrejahani, S Kanao, I Yamaga, Y Nakayama, M Tokiwa, M Torii, T Yagi, T Sakurai, K Togashi, T Shiina
Noninvasive measurement of the distribution and oxygenation state of hemoglobin (Hb) inside the tissue is strongly required to analyze the tumor-associated vasculatures. We developed a photoacoustic imaging (PAI) system with a hemispherical-shaped detector array (HDA). Here, we show that PAI system with HDA revealed finer vasculature, more detailed blood-vessel branching structures, and more detailed morphological vessel characteristics compared with MRI by the use of breast shape deformation of MRI to PAI and their fused image...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28168852/hemoglobin-screening-in-blood-donors-a-prospective-study-assessing-the-value-of-an-invasive-and-a-noninvasive-point-of-care-device-for-donor-safety
#4
Dorien De Clippel, Leen Van Heddegem, Giovani Vandewalle, Philippe Vandekerckhove, Veerle Compernolle
BACKGROUND: Low hemoglobin (Hb) levels are a common reason for whole blood donor deferral. As some of the deferred donors do not return to donate blood later, the development of accurate tools to reliably detect low Hb levels is therefore important for donor safety and retention. STUDY DESIGN AND METHODS: In a prospective study, 1483 whole blood donors were enrolled in three study arms. In each study arm the Hb results measured with a point-of-care testing device were compared with the venous Hb results obtained in our central laboratory...
February 6, 2017: Transfusion
https://www.readbyqxmd.com/read/28149919/comparison-of-group-level-source-localized-activity-for-simultaneous-functional-near-infrared-spectroscopy-magnetoencephalography-and-simultaneous-fnirs-fmri-during-parametric-median-nerve-stimulation
#5
Theodore Huppert, Jeff Barker, Benjamin Schmidt, Shawn Walls, Avniel Ghuman
Functional near-infrared spectroscopy (fNIRS) is a noninvasive neuroimaging technique, which uses light to measure changes in cerebral blood oxygenation through sensors placed on the surface of the scalp. We recorded concurrent fNIRS with magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) in order to investigate the group-level correspondence of these measures with source-localized fNIRS estimates. Healthy participants took part in both a concurrent fNIRS-MEG and fNIRS-fMRI neuroimaging session during two somatosensory stimulation tasks, a blocked design median nerve localizer and parametric pulsed-pair median nerve stimulation using interpulse intervals from 100 to 500 ms...
January 2017: Neurophotonics
https://www.readbyqxmd.com/read/28106356/accuracy-of-non-invasive-hemoglobin-monitoring-by-pulse-co-oximeter-during-liver-transplantation
#6
Gulay Erdogan Kayhan, Yusuf Z Colak, Mukadder Sanli, Muharrem Ucar, Huseyin I Toprak
BACKGROUND: Hemoglobin level monitoring is essential during liver transplantation (LT) due to substantial blood loss. We evaluated the accuracy of noninvasive and continuous hemoglobin monitoring (SpHb) obtained by a transcutaneous spectrophotometry-based technology (Masimo Corporation, Irvine, CA) compared with conventional laboratory Hb measurement (HbL) during LT. Additionally, we made subgroup analyses for distinct surgical phases that have special features and hemodynamic problems and thus may affect the accuracy of SpHb...
January 20, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28099042/sex-differences-in-associations-between-insulin-resistance-heart-rate-variability-and-arterial-stiffness-in-healthy-women-and-men-a-physiology-study
#7
Luke Anthony Rannelli, Jennifer M MacRae, Michelle C Mann, Sharanya Ramesh, Brenda R Hemmelgarn, Doreen Rabi, Darlene Y Sola, Sofia B Ahmed
Diabetes confers greater cardiovascular risk to women than to men. Whether insulin-resistance-mediated risk extends to the healthy population is unknown. Measures of insulin resistance (fasting insulin, homeostatic model assessment, hemoglobin A1c, quantitative insulin sensitivity check index, glucose) were determined in 48 (56% female) healthy subjects. Heart rate variability (HRV) was calculated by spectral power analysis and arterial stiffness was determined using noninvasive applanation tonometry. Both were measured at baseline and in response to angiotensin II infusion...
November 2, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28077748/poor-validity-of-noninvasive-hemoglobin-measurements-by-pulse-oximetry-compared-with-conventional-absorptiometry-in-children-in-c%C3%A3-te-d-ivoire
#8
Isaac I Bogoch, Jean T Coulibaly, Jason Rajchgot, Jason R Andrews, Jana Kovac, Jürg Utzinger, Gordana Panic, Jennifer Keiser
Anemia remains a major public health issue in many African communities. We compared a novel, commercially available noninvasive hemoglobin (Hb)-measuring device to direct Hb measurements by finger-prick samples in a pediatric cohort in rural Côte d'Ivoire. Noninvasive Hb measurements were attempted in 191 children 2-15 years of age and obtained in 102 (53.5%) children. The median Hb for the 102 children was 12.0 g/dL (interquartile range [IQR] = 11.3-12.7 g/dL) for conventional absorptiometry and 13.3 g/dL (IQR = 12...
January 11, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28041606/acquisition-retention-and-transfer-of-simulated-laparoscopic-tasks-using-fnir-and-a-contextual-interference-paradigm
#9
Patricia A Shewokis, Faiz U Shariff, Yichuan Liu, Hasan Ayaz, Andres Castellanos, D Scott Lind
BACKGROUND: Using functional near infrared spectroscopy, a noninvasive, optical brain imaging tool that monitors changes in hemodynamics within the prefrontal cortex (PFC), we assessed performance and cognitive effort during the acquisition, retention and transfer of multiple simulated laparoscopic tasks by novice learners within a contextual interference paradigm. METHODS: Third-year medical students (n = 10) were randomized to either a blocked or random practice schedule...
February 2017: American Journal of Surgery
https://www.readbyqxmd.com/read/28034464/noninvasive-hemoglobin-monitoring-in-critically-ill-pediatric-patients-at-risk-of-bleeding
#10
P García-Soler, J M Camacho Alonso, J M González-Gómez, G Milano-Manso
OBJECTIVE: To determine the accuracy and usefulness of noninvasive continuous hemoglobin (Hb) monitoring in critically ill patients at risk of bleeding. DESIGN: An observational prospective study was made, comparing core laboratory Hb measurement (LabHb) as the gold standard versus transcutaneous hemoglobin monitoring (SpHb). SETTING: Pediatric Intensive Care Unit of a tertiary University Hospital. PATIENTS: Patients weighing >3kg at risk of bleeding...
December 26, 2016: Medicina Intensiva
https://www.readbyqxmd.com/read/27932196/a-mini-volume-loading-test-mvlt-using-2-5-mlkg-1-boluses-of-crystalloid-for-indication-of-perioperative-changes-in-hydration-status
#11
Audrius Andrijauskas, Christer H Svensen, Narūnas Porvaneckas, Jūratė Šipylaitė, Edgaras Stankevičius, Darius Činčikas, Valentinas Uvarovas, Saulė Švedienė, Igoris Šatkauskas, Saulius Vosylius, Giedrius Kvederas
BACKGROUND AND OBJECTIVE: A mini volume loading test (mVLT) evaluating hemodilution during step-wise crystalloid infusion has established that the arterio-capillary plasma dilution difference is inversely correlated to the body hydration level of subjects. This observational study aimed to test whether this can be replicated in a perioperative setting using a 2.5-mLkg(-1) boluses. MATERIALS AND METHODS: The mVLT was performed before induction of regional anesthesia and 24h later...
2016: Medicina
https://www.readbyqxmd.com/read/27870589/results-of-a-prospective-study-evaluating-a-noninvasive-method-of-hemoglobin-adjustment-for-determining-the-diffusing-capacity-of-the-lung
#12
Karla E Foster, Rashmi D Sahay, Nanhua Zhang, William D Hardie
RATIONALE: Measurement of the diffusing capacity of the lung for carbon monoxide (DlCO) is significantly influenced by the pulmonary capillary blood volume. Consequently, measurements require adjustment for blood hemoglobin concentration (DlCOadj) to allow meaningful clinical interpretation. Noninvasive point-of-care devices that measure hemoglobin transcutaneously provide immediate values for hemoglobin that may be useful in pulmonary function laboratories for determining DlCOadj. OBJECTIVES: To test the hypothesis that DlCOadj determinations obtained with a commercially available device for noninvasive, point-of-care measurement of blood hemoglobin concentrations are not significantly different from determinations obtained using hemoglobin concentrations measured conventionally in venous blood samples...
January 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/27827310/cardiovascular-phenotypes-in-children-with-ckd-the-4c-study
#13
Franz Schaefer, Anke Doyon, Karolis Azukaitis, Aysun Bayazit, Nur Canpolat, Ali Duzova, Ana Niemirska, Betul Sözeri, Daniela Thurn, Ali Anarat, Bruno Ranchin, Mieczyslav Litwin, Salim Caliskan, Cengiz Candan, Esra Baskin, Ebru Yilmaz, Sevgi Mir, Marietta Kirchner, Anja Sander, Dieter Haffner, Anette Melk, Elke Wühl, Rukshana Shroff, Uwe Querfeld
BACKGROUND AND OBJECTIVES: Cardiovascular disease is the most important comorbidity affecting long-term survival in children with CKD. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: The Cardiovascular Comorbidity in Children with CKD Study is a multicenter, prospective, observational study in children ages 6-17 years old with initial GFR of 10-60 ml/min per 1.73 m(2). The cardiovascular status is monitored annually, and subclinical cardiovascular disease is assessed by noninvasive measurements of surrogate markers, including the left ventricular mass index, carotid intima-media thickness, and central pulse wave velocity...
January 6, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/27807663/effect-of-posture-and-extracranial-contamination-on-results-of-cerebral-oximetry-by-near-infrared-spectroscopy
#14
Shinya Kato, Kenji Yoshitani, Yosuke Kubota, Yuzuru Inatomi, Yoshihiko Ohnishi
BACKGROUND: Near-infrared spectroscopy (NIRS)-based cerebral oximetry is a noninvasive technology used to estimate regional cerebral oxygen saturation (rSO2). Extracranial blood flow is known to substantially affect rSO2 values measured by most clinically available devices. Several studies have also reported that the Trendelenburg position and upright position have a larger effect on rSO2 measurements than the supine position. Therefore, we investigated the effect of these two positions (the Trendelenburg position versus the upright position) and extracranial contamination on rSO2 measurements obtained using two commercially available devices and one prototype device...
November 2, 2016: Journal of Anesthesia
https://www.readbyqxmd.com/read/27807379/validation-of-noninvasive-hemoglobin-measurements-using-co-oximetry-in-anesthetized-dogs
#15
Matt R Read, Jenna Rondeau, Grace P S Kwong
New technology allows noninvasive measurement of total hemoglobin (Hb) in humans through use of multiple wavelength co-oximetry. This monitor is now available to the veterinary market but no studies have been performed to validate its use in animals. This study investigated the use of co-oximetry to measure Hb in anesthetized dogs by comparing "gold standard" Hb measurements from a laboratory (LabHb) with those measured by the co-oximeter (SpHb). Bland-Altman analysis showed that the monitor had a bias of -3...
November 2016: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
https://www.readbyqxmd.com/read/27757915/the-impact-of-red-blood-cell-transfusion-on-cerebral-tissue-oxygen-saturation-in-severe-traumatic-brain-injury
#16
Victoria A McCredie, Simone Piva, Marlene Santos, Wei Xiong, Airton Leonardo de Oliveira Manoel, Andrea Rigamonti, Gregory M T Hare, Martin G Chapman, Andrew J Baker
BACKGROUND: There are a range of opinions on the benefits and thresholds for the transfusion of red blood cells in critically ill patients with traumatic brain injury (TBI) and an urgent need to understand the neurophysiologic effects. The aim of this study was to examine the influence of red blood cell transfusions on cerebral tissue oxygenation (SctO2) in critically ill TBI patients. METHODS: This prospective observational study enrolled consecutive TBI patients with anemia requiring transfusion...
October 18, 2016: Neurocritical Care
https://www.readbyqxmd.com/read/27723894/oxygen-saturation-of-retinal-vessels-in-all-stages-of-diabetic-retinopathy-and-correlation-to-ultra-wide-field-fluorescein-angiography
#17
Abhilash Guduru, Teresa G Martz, Alexa Waters, Abhijit V Kshirsagar, Seema Garg
Purpose: The purpose of this study was to determine retinal hemoglobin oxygen saturation (SO2) in patients with diabetic retinopathy (DR) using retinal oximetry (RO) and to correlate the degree of retinal ischemia using intravenous fluorescein angiography (IVFA). Methods: This is a single-center cross-sectional cohort study. Twenty-seven controls and 60 adult patients with diabetes mellitus (16 without DR and 44 with DR) were enrolled. Patients were stratified according to DR severity...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27717415/monitoring-oxygen-status
#18
J G Toffaletti, C R Rackley
Although part of a common "blood gas" test panel with pH and pCO2, the pO2, %O2Hb, and related parameters are independently used to detect and monitor oxygen deficits from a variety of causes. Measurement of blood gases and cooximetry may be done by laboratory analyzers, point of care testing, noninvasive pulse oximetry, and transcutaneous blood gases. The specimen type and mode of monitoring oxygenation that are chosen may be based on a combination of urgency, practicality, clinical need, and therapeutic objectives...
2016: Advances in Clinical Chemistry
https://www.readbyqxmd.com/read/27695597/continuous-qualitative-electroencephalography-as-a-noninvasive-neuromonitor
#19
Zachary D Threlkeld, Mohan Kottapally, Aimee Aysenne, Nerissa Ko
Intracranial pressure (ICP) monitoring frequently guides key decisions in the management of diseases causing intracranial hypertension. Although typically measured by invasive means, contraindications may leave the clinician with little recourse for dynamic ICP evaluation-particularly when the patient's mental status is compromised. We describe here a healthy 18-year-old woman who subacutely progressed to coma due to diffuse cerebral venous sinus thrombosis. Heparinization precluded the use of invasive ICP monitoring, and electroencephalography (EEG) was used novelly as a surrogate ICP monitor...
October 2016: Neurohospitalist
https://www.readbyqxmd.com/read/27638999/time-taken-to-the-maximum-increase-in-the-oxygenated-hemoglobin-level-in-calf-muscle-as-a-predictor-of-mild-and-moderate-post-thrombotic-syndrome
#20
Takashi Yamaki, Yuki Hasegawa, Atsuyoshi Osada, Hisato Konoeda, Atsumori Hamahata, Masakazu Ochi, Motohiro Nozaki, Hiroyuki Sakurai
BACKGROUND: Near-infrared spectroscopy (NIRS) allows continuous noninvasive monitoring of changes in the tissue levels of oxygenated hemoglobin (O2Hb) and deoxygenated hemoglobin (HHb) and can identify the severity of chronic venous diseases. Here we investigated the predictors of post-thrombotic syndrome (PTS) using NIRS in patients with a first episode of deep venous thrombosis (DVT). METHODS: The study enrolled 129 patients with DVT. Risk factors in each patient were assessed at presentation...
October 2016: Journal of Vascular Surgery. Venous and Lymphatic Disorders
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