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Oximetry

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https://www.readbyqxmd.com/read/28810002/retinal-oximetry-discovers-novel-biomarkers-in-retinal-and-brain-diseases
#1
Einar Stefánsson, Olof Birna Olafsdottir, Anna Bryndis Einarsdottir, Thorunn Scheving Eliasdottir, Thor Eysteinsson, Wouter Vehmeijer, Evelien Vandewalle, Toke Bek, Sveinn Hakon Hardarson
Purpose: Biomarkers for several eye and brain diseases are reviewed, where retinal oximetry may help confirm diagnosis or measure severity of disease. These include diabetic retinopathy, central retinal vein occlusion (CRVO), retinitis pigmentosa, glaucoma, and Alzheimer's disease. Methods: Retinal oximetry is based on spectrophotometric fundus imaging and measures oxygen saturation in retinal arterioles and venules in a noninvasive, quick, safe manner. Retinal oximetry detects changes in oxygen metabolism, including those that result from ischemia or atrophy...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28808186/oxygenation-inflammatory-response-and-lung-injury-during-one-lung-ventilation-in-rabbits-using-inspired-oxygen-fraction-of-0-6-vs-1-0
#2
Zeping Xu, Lianbing Gu, Qingming Bian, Pengyi Li, Lijun Wang, Jingyuan Zhang, Yanning Qian
Maintaining adequate oxygenation during one-lung ventilation (OLV) requires high inspired oxygen fraction (FiO2). However, high FiO2 also causes inflammatory response and lung injury. Therefore, it remains a great interest to clinicians and scientists to optimize the care of patients undergoing OLV. The aim of this study was to determine and compare oxygenation, inflammatory response and lung injury during OLV in rabbits using FiO2 of 0.6 vs. 1.0. After 30 minutes of two-lung ventilation (TLV) as baseline, 30 rabbits were randomly assigned to three groups receiving mechanical ventilation for 3 hours: the sham group, receiving TLV with 0...
October 17, 2016: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28807985/inhaled-carbon-monoxide-from-toxin-to-therapy
#3
Dean R Hess
Carbon monoxide (CO) is usually recognized as a toxic gas that can be used to assess lung function in the pulmonary function laboratory. The toxicity of CO relates to its high affinity for hemoglobin and other heme molecules, producing carboxyhemoglobin (HbCO). Despite that blood HbCO levels are commonly measured in patients with CO poisoning, the clinical presentation often does not correlate with the HbCO level, and clinical improvement in the patient's condition does not correlate with HbCO clearance. In patients with CO poisoning, administration of 100% O2 is standard practice...
August 14, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28803519/a-case-report-of-benzocaine-induced-methemoglobinemia
#4
Chaundra R Sewell, Michael P Rivey
Methemoglobinemia is a serious medical condition characterized by the disrupted binding of oxygen to iron on hemoglobin, with a consequent impaired oxygen delivery to body tissues. Various drugs including the local anesthetics such as benzocaine can cause acquired methemoglobinemia. The reported case describes methemoglobinemia that occurred in association with the use of topical benzocaine spray and lozenges in a previously healthy 51-year-old female who had undergone colon surgery to remove a bleeding polyp...
January 1, 2017: Journal of Pharmacy Practice
https://www.readbyqxmd.com/read/28800979/advancing-cerebral-oximetry-research-one-small-step-at-a-time
#5
EDITORIAL
Hilary P Grocott
No abstract text is available yet for this article.
August 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28798658/miniaturized-battery-free-wireless-systems-for-wearable-pulse-oximetry
#6
Jeonghyun Kim, Philipp Gutruf, Antonio M Chiarelli, Seung Yun Heo, Kyoungyeon Cho, Zhaoqian Xie, Anthony Banks, Seungyoung Han, Kyung-In Jang, Jung Woo Lee, Kyu-Tae Lee, Xue Feng, Yonggang Huang, Monica Fabiani, Gabriele Gratton, Ungyu Paik, John A Rogers
Development of unconventional technologies for wireless collection, storage and analysis of quantitative, clinically relevant information on physiological status is of growing interest. Soft, biocompatible systems are widely regarded as important because they facilitate mounting on external (e.g. skin) and internal (e.g. heart, brain) surfaces of the body. Ultra-miniaturized, lightweight and battery-free devices have the potential to establish complementary options in bio-integration, where chronic interfaces (i...
January 5, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/28791567/the-oxygen-reserve-index-ori-a-new-tool-to-monitor-oxygen-therapy
#7
REVIEW
T W L Scheeren, F J Belda, A Perel
Supplemental oxygen is administered in the vast majority of patients in the perioperative setting and in the intensive care unit to prevent the potentially deleterious effects of hypoxia. On the other hand, the administration of high concentrations of oxygen may induce hyperoxia that may also be associated with significant complications. Oxygen therapy should therefore be precisely titrated and accurately monitored. Although pulse oximetry has become an indispensable monitoring technology to detect hypoxemia, its value in assessing the oxygenation status beyond the range of maximal arterial oxygen saturation (SpO2 ≥97%) is very limited...
August 8, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28791532/diameter-changes-of-retinal-vessels-in-diabetic-retinopathy
#8
REVIEW
Toke Bek
PURPOSE OF REVIEW: The diameter of retinal vessels is an important source of information about retinal blood flow and metabolism. The purpose of the present study is to review how diameter changes of retinal vessels contribute to the development of diabetic retinopathy and may be a marker of the prognosis of the disease. RECENT FINDINGS: The early stages of diabetic retinopathy are accompanied with dilatation of the diameter of retinal vessels and reduced autoregulation...
August 8, 2017: Current Diabetes Reports
https://www.readbyqxmd.com/read/28780379/proinflammatory-cytokine-mif-plays-a-role-in-the-pathogenesis-of-type-2-diabetes-mellitus-but-does-not-affect-hepatic-mitochondrial-function
#9
Miriam Rodriguez-Sosa, Tecilli Cabellos-Avelar, Yuriko Sanchez-Zamora, Imelda Juárez-Avelar, Esperanza García-Reyes, Alejandra Lira-León, José Del Carmen Benítez-Flores, Thalia Pacheco-Fernández, Marcia Hiriart, Emma Berta Gutiérrez-Cirlos
BACKGROUND: Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine that plays an important role in the pathogenesis of type 2 diabetes mellitus (T2DM). Although the effect of high glucose on liver function has been described, the role of MIF in hepatic mitochondrial function during T2DM has not been studied. OBJECTIVE: We examine the influence of MIF to hepatic mitochondrial function in T2DM mouse model. METHODS: WT and Mif(-/-) BALB/c mice were treated with a single dose of streptozotocin (STZ)...
August 2, 2017: Cytokine
https://www.readbyqxmd.com/read/28777054/an-investigation-of-skin-perfusion-in-venous-leg-ulcer-after-exercise
#10
Omar Mutlak, Mohammed Aslam, Nigel J Standfield
INTRODUCTION: A venous leg ulcer (VLU) has a major impact on the quality of life and functional ability of individuals, but no single treatment is yet effective. This study investigates the changes induced by dorsiflexion exercise on skin perfusion in VLU patients to achieve a better understanding of venous ulcer pathophysiology. METHODS: Seventy-eight venous leg ulcer patients were randomised into four groups. The non-exercise groups included a control group (n = 18) and a compression therapy group (n = 20) and the exercise groups included an exercise-only group (n = 20) and a compression and exercise group (n = 20)...
July 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28772311/retinal-oximetry-differences-between-optic-disc-collateral-vessels-and-new-vessels
#11
Luke Nicholson, Chrishne Sivapathasuntharam, Marta Zola, Philip Hykin, James W Bainbridge, Sobha Sivaprasad
No abstract text is available yet for this article.
August 3, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28768288/reliability-and-validity-of-a-smartphone-paired-pulse-oximeter-for-screening-of-critical-congenital-heart-defects-in-newborns
#12
Maurice J Huizing, Eduardo Villamor-Martínez, Ingrid A Chavagne, Ward Y Vanagt, Marc A E Spaanderman, Eduardo Villamor
BACKGROUND: Barriers to widespread implementation of pulse oximetry screening of critical congenital heart defects (CCHD) in newborns include increasing trends of out-of-hospital births and cost of equipment. In recent years, smartphone-compatible pulse oximeters have appeared on the market, but the validity of such devices in the setting of CCHD screening has not been evaluated. OBJECTIVES: To compare the performance in CCHD screening of a smartphone-paired pulse oximeter (Masimo iSpO2-Rx™) and a hospital-grade pulse oximeter (Masimo Radical-7™)...
August 3, 2017: Neonatology
https://www.readbyqxmd.com/read/28765148/changes-in-retinal-venular-oxygen-saturation-predict-activity-of-proliferative-diabetic-retinopathy-3-months-after-panretinal-photocoagulation
#13
Thomas Lee Torp, Ryo Kawasaki, Tien Yin Wong, Tunde Peto, Jakob Grauslund
BACKGROUND/AIMS: Proliferative diabetic retinopathy (PDR) is a severe blinding condition. We investigated whether retinal metabolism, measured by retinal oximetry, may predict PDR activity after panretinal laser photocoagulation (PRP). METHODS: We performed a prospective, interventional, clinical study of patients with treatment-naive PDR. Wide-field fluorescein angiography (OPTOS, Optomap) and global and focal retinal oximetry (Oxymap T1) were performed at baseline (BL), and 3 months (3M) after PRP...
August 1, 2017: British Journal of 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
#14
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/28762949/laser-doppler-flowmetry-and-transcutaneous-oximetry-in-chronic-skin-ulcers-a-comparative-evaluation
#15
Edoardo Raposio, Nicolò Bertozzi, Rebecca Moretti, Eugenio Grignaffini, Michele P Grieco
INTRODUCTION/OBJECTIVE: Laser Doppler Flowmetry (LDF) and transcutaneous oximetry (TcpO2) are established methods for investigating cutaneous perfusion. To date, no study previously performed has compared data obtained from these 2 methodologies in cases of chronic cutaneous ulcers. MATERIALS AND METHODS: Laser Doppler Flowmetry and TcpO2 were performed in 25 consecutive outpatients with chronic lower limb ulcers (group A, experimental; 9 women and 16 men; mean age 67 years [range, 52-81 years]) and 25 age- and sex-matched healthy control subjects (group B, control) enrolled for the study...
April 27, 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/28759491/the-evaluation-of-a-noninvasive-respiratory-volume-monitor-in-pediatric-patients-undergoing-general-anesthesia
#16
Andrea D Gomez-Morad, Joseph P Cravero, Brian C Harvey, Rachel Bernier, Erin Halpin, Brian Walsh, Viviane G Nasr
BACKGROUND: Pediatric patients following surgery are at risk for respiratory compromise such as hypoventilation and hypoxemia depending on their age, comorbidities, and type of surgery. Quantitative measurement of ventilation in nonintubated infants/children is a difficult and inexact undertaking. Current respiratory assessment in nonintubated patients relies on oximetry data, respiratory rate (RR) monitors, and subjective clinical assessment, but there is no objective measure of respiratory parameters that could be utilized to predict early respiratory compromise...
July 27, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28759260/nocturnal-oximetry-based-evaluation-of-habitually-snoring-children
#17
Roberto Hornero, Leila Kheirandish-Gozal, Gonzalo C Gutiérrez-Tobal, Mona F Philby, María Luz Alonso-Álvarez, Daniel Álvarez, Ehab A Dayyat, Zhifei Xu, Yu-Shu Huang, Maximiliano Tamae Kakazu, Albert M Li, Annelies Van Eyck, Pablo E Brockmann, Zarmina Ehsan, Narong Simakajornboon, Athanasios G Kaditis, Fernando Vaquerizo-Villar, Andrea Crespo Sedano, Oscar Sans Capdevila, Magnus von Lukowicz, Joaquín Terán-Santos, Félix Del Campo, Christian F Poets, Rosario Ferreira, Katalina Bertran, Yamei Zhang, John Schuen, Stijn Verhulst, David Gozal
BACKGROUND: The vast majority of children around the world undergoing adenotonsillectomy for obstructive sleep apnea-hypopnea syndrome (OSA) are not objectively diagnosed with nocturnal polysomnography (NPSG) due to access availability and cost issues. Automated analysis of nocturnal oximetry (nSpO2), which is readily and globally available, could potentially provide a reliable and convenient diagnostic approach for pediatric OSA. METHODS: De-identified nSpO2 recordings from a total of 4,191 children originating from 13 pediatric sleep laboratories around the world were prospectively evaluated after developing and validating an automated neural network algorithm using an initial set of single-channel nSpO2 recordings from 589 patients referred for suspected OSA...
July 31, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28756482/epr-oximetry-of-cetuximab-treated-head-and-neck-tumours-in-a-mouse-model
#18
H Gustafsson, A Kale, A Dasu, A Lund, P-H Edqvist, K Roberg
Head and neck squamous cell carcinoma (HNSCC) tumours are associated with high mortality despite advances in therapy. The monoclonal antibody cetuximab (Erbitux(®)) has been approved for the treatment of advanced HNSCC. However, only a subset of HNSC patients receiving cetuximab actually responds to treatment, underlining the need for a means to tailor treatments of individual patients. The aim of the present study was to investigate the effect of cetuximab treatment on tumour growth, on tumour partial oxygen pressure as measured by LiPc electron paramagnetic resonance oximetry and on the expression of proteins involved in tumour growth, metabolism and hypoxia...
July 29, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28750729/-preparation-of-sedation-analgesia-procedures-in-spanish-paediatric-emergency-departments-a-descriptive-study
#19
Concepción Míguez, Niki Oikonomopoulou, Jorge Lorente, Paula Vázquez
INTRODUCTION: The objective of this study was to describe the current practice regarding the preparation of the sedation-analgesia (SA) procedures performed in the paediatric emergency centres in Spain. MATERIAL AND METHODS: A multicentre, observational and prospective analytical study was carried out on the SA procedures that were performed on children under 18 years-old in 18 paediatric emergency departments between February 2015 and January 2016. RESULTS: A total of 658 SA procedures were registered in 18 hospitals of Spain, most of them to children older than 24 months...
July 24, 2017: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
https://www.readbyqxmd.com/read/28750686/carbon-dioxide-narcosis-due-to-inappropriate-oxygen-delivery-a-case-report
#20
Thomas Herren, Eva Achermann, Thomas Hegi, Adrian Reber, Max Stäubli
BACKGROUND: Oxygen delivery to patients with chronic obstructive pulmonary disease may be challenging because of their potential hypoxic ventilatory drive. However, some oxygen delivery systems such as non-rebreathing face masks with an oxygen reservoir bag require high oxygen flow for adequate oxygenation and to avoid carbon dioxide rebreathing. CASE PRESENTATION: A 72-year-old Caucasian man with severe chronic obstructive pulmonary disease was admitted to the emergency department because of worsening dyspnea and an oxygen saturation of 81% measured by pulse oximetry...
July 28, 2017: Journal of Medical Case Reports
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