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Oximetry

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https://www.readbyqxmd.com/read/29333931/hyperspectral-imaging-of-tissue-perfusion-and-oxygenation-in-wounds-assessing-the-impact-of-a-micro-capillary-dressing
#1
Thomas Wild, Markus Becker, Jochen Winter, Nicole Schuhschenk, Georg Daeschlein, Frank Siemers
OBJECTIVE: Experimental tests of non-invasive multi- or hyperspectral imaging (HSI) systems reveal the high potential of support for medical diagnostic purposes and scientific biomedical analysis. Until now the use of HSI technologies for medical applications was limited by complex and overly sophisticated systems. We present a new and compact HSI-camera that could be used in normal clinical practice. METHOD: We assessed the use of the HSI system on the hands of 10 healthy volunteers, looking at control parameters, and those following venous occlusion, arterial occlusion and reperfusion, including tissue oxygenation, tissue haemoglobin index, perfusion in 4-6mm depth=near infrared spectroscopy (NIR), and tissue water index...
January 2, 2018: Journal of Wound Care
https://www.readbyqxmd.com/read/29331552/malperfusion-during-hypothermic-antegrade-cerebral-perfusion-cerebral-perfusion-index-an-early-indicator-compared-to-cerebral-oximetry
#2
Mark W Fegley, Audrey Spelde, David Johnson, Nimesh D Desai, Warren J Levy
No abstract text is available yet for this article.
September 21, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29330589/impact-of-valve-less-vs-standard-insufflation-on-pneumoperitoneum-volume-inflammation-and-peritoneal-physiology-in-a-laparoscopic-sigmoid-resection-experimental-model
#3
Michele Diana, Eric Noll, Andras Legnèr, Seong-Ho Kong, Yu-Yin Liu, Luigi Schiraldi, Francesco Marchegiani, Jordan Bano, Bernard Geny, Anne-Laure Charles, Bernard Dallemagne, Véronique Lindner, Didier Mutter, Pierre Diemunsch, Jacques Marescaux
BACKGROUND: Standard insufflators compensate for intra-abdominal pressure variations with pressure spikes. Our aim was to evaluate the impact of a stable, low-pressure pneumoperitoneum induced by a valve-less insufflator, on working space, hemodynamics, inflammation, and peritoneal physiology, in a model of laparoscopic sigmoid resection. MATERIALS AND METHODS: Twelve pigs (47 ± 3.3 kg) were equipped for invasive hemodynamic monitoring and randomly assigned to Standard (n = 6) vs...
January 12, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29327348/respiratory-dysfunction-progresses-with-age-in-kcna1-null-mice-a-model-of-sudden-unexpected-death-in-epilepsy
#4
Kristina A Simeone, Jodi Hallgren, Charles S Bockman, Ankita Aggarwal, Vikash Kansal, Lauren Netzel, Shruthi H Iyer, Stephanie A Matthews, Malavika Deodhar, Peter J Oldenburg, Peter W Abel, Timothy A Simeone
OBJECTIVE: Increased breathing rate, apnea, and respiratory failure are associated with sudden unexpected death in epilepsy (SUDEP). We recently demonstrated the progressive nature of epilepsy and mortality in Kcna1-/- mice, a model of temporal lobe epilepsy and SUDEP. Here we tested the hypothesis that respiratory dysfunction progresses with age in Kcna1-/- mice, thereby increasing risk of respiratory failure and sudden death (SD). METHODS: Respiratory parameters were determined in conscious mice at baseline and following increasing doses of methacholine (MCh) using noninvasive airway mechanics (NAM) systems...
January 12, 2018: Epilepsia
https://www.readbyqxmd.com/read/29327119/nocturnal-hypoxemic-burden-is-associated-with-epicardial-fat-volume-in-patients-with-acute-myocardial-infarction
#5
Dominik Linz, Stefan Colling, Wolfgang Nußstein, Kurt Debl, Mathias Hohl, Claudia Fellner, Michael Böhm, Lars S Maier, Okka W Hamer, Stefan Buchner, Michael Arzt
BACKGROUND: Increased epicardial fat volume (EFV) is a common feature of patients with sleep-disordered breathing (SDB), is considered as an established marker of cardiovascular risk, and is associated with adverse cardiovascular events after myocardial infarction (MI). METHODS: To investigate the association between different measures of SDB severity and EFV after acute MI, we enrolled 105 patients with acute MI in this study. Unattended in-hospital polysomnography was performed to determine the number of apneas and hypopneas per hour during sleep (apnea-hypopnea index, AHI)...
January 11, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29325705/intra-test-and-test-retest-reliability-of-exercise-oximetry-in-arterial-claudication
#6
S Henni, Y W Semporé, T Le Meliner, N Ouedraogo, J-F Hamel, P Abraham
BACKGROUND: Transcutaneous oxygen pressure (tcpO2) reliability is blunted by an unpredictable transcutaneous gradient through the skin. We hypothesized that the "Decrease from Rest of Oxygen pressure (DROP: subtraction of limb-changes from chest-changes from the respective starting values) would show a good to excellent reliability during Exercise -tcpO2 investigations. METHODS: In three different experiments we tested: The intra-test variability at the peripheral level (Experiment A: 32 patients, 16 at each location), at the chest level (Experiment B: 45 patients) and the test-retest reproducibility within 3 months (Experiment C: 67 patients)...
January 8, 2018: Microvascular Research
https://www.readbyqxmd.com/read/29324491/validation-of-a-second-generation-near-infrared-spectroscopy-monitor-in-children-with-congenital-heart-disease
#7
Viviane G Nasr, Lisa T Bergersen, Hung-Mo Lin, Paul B Benni, Rachel S Bernier, Michelle E Anderson, Barry D Kussman
BACKGROUND: Cerebral oximetry using near-infrared spectroscopy is a noninvasive optical technology to detect cerebral hypoxia-ischemia and develop interventions to prevent and ameliorate hypoxic brain injury. Cerebral oximeters are calibrated and validated by comparison of the near-infrared spectroscopy-measured cerebral O2 saturation (SctO2) to a "field" or reference O2 saturation (REF CX) calculated as a weighted average from arterial and jugular bulb oxygen saturations. In this study, we calibrated and validated the second-generation, 5 wavelength, FORE-SIGHT Elite with the medium sensor (source-detector separation 12 and 40 mm) for measurement of SctO2 in children with congenital heart disease...
January 9, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29321339/detection-of-anterior-circulation-large-artery-occlusion-in-ischemic-stroke-using-noninvasive-cerebral-oximetry
#8
Alexander C Flint, Shiv G Bhandari, Sean P Cullen, Adhikari V Reddy, Daniel P Hsu, Vivek A Rao, Minal Patel, Jasmeen Pombra, Nancy J Edwards, Sheila L Chan
BACKGROUND AND PURPOSE: Large artery occlusion (LAO) in ischemic stroke requires recognition and triage to an endovascular stroke treatment center. Noninvasive LAO detection is needed to improve triage. METHODS: Prospective study to test whether noninvasive cerebral oximetry can detect anterior circulation LAO in acute stroke. Interhemispheric ΔBrSO2 in LAO was compared with controls. RESULTS: In LAO stroke, mean interhemispheric ΔBrSO2 was -8...
January 10, 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29319558/prone-position-cerebral-oximetry-and-delirium
#9
Hilary P Grocott
No abstract text is available yet for this article.
January 9, 2018: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/29318718/regional-cerebral-tissue-oxygen-saturation-changes-following-blood-transfusion-in-neuro-intensive-care-unit-patients%C3%A2-%C3%A2-a-pilot-observational-study
#10
R Muthuchellappan, N A Shaikh, R M Surve, U R S Ganne, M Philip
BACKGROUND: Although central venous oxygen saturation (ScvO2 ) is used to decide on red blood cell (RBC) transfusion, whether its improvement is associated with parallel improvement in cerebral oxygenation is not adequately studied. This study looked at changes in regional cerebral tissue oxygen saturation (rSO2 ) following RBC transfusion in neuro-intensive care unit (ICU) patients. METHODS: In this prospective observational pilot study, rSO2 was measured in adult neuro-ICU patients before RBC transfusion, at the end and at 6, 12, 18 and 24 h after RBC transfusion...
January 10, 2018: Transfusion Medicine
https://www.readbyqxmd.com/read/29317764/cerebral-oxygenation-during-umbilical-arterial-blood-sampling-in-very-low-birth-weight-neonates
#11
Jonathan P Mintzer, Catherine Messina
OBJECTIVE: Umbilical arterial blood sampling (UABS) has been associated with cerebral oxygen saturation (CrSO2) decrements in very low birth weight (VLBW) neonates. We sought to determine patient- and UABS procedure-related factors contributing to this effect. STUDY DESIGN: In this prospective cohort study, cerebral near-infrared spectroscopy was performed during UABS procedures in VLBW neonates. Analyses were conducted to determine subject- and procedure-related factors correlating with CrSO2 decrements...
January 9, 2018: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/29306678/exercise-transcutaneous-oximetry-significantly-modifies-the-diagnostic-hypotheses-and-impacts-scheduled-investigations-or-treatments-of-patients-with-exertional-limb-pain
#12
Samir Henni, Guillaume Mahe, Christophe Lamotte, Remi Laurent, Alessandra Bura Riviere, Marion Aubourg, Gabrielle Sarlon, Damien Laneelle, Anne Long, Isabelle Signolet, Jean Picquet, Mathieu Feuilloy, Pierre Abraham
INTRODUCTION: In lower extremity peripheral artery disease (PAD), transcutaneous oximetry at exercise (Ex-TcpO2) has been largely validated in research practice, but evidence of routine practice in various vascular laboratories is missing. We hypothesized that Ex-TcPO2 would change the diagnosis hypotheses, investigations and treatments for patients referred for exertional limb pain. MATERIAL & METHODS: A multicenter prospective trial was conducted in nine different referral centers...
January 3, 2018: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/29304240/adipose-tissue-derived-stem-cells-in-a-fibrin-implant-enhance-neovascularization-in-a-peritoneal-grafting-site-a-potential-way-to-improve-ovarian-tissue-transplantation
#13
D D Manavella, L Cacciottola, C M Desmet, B F Jordan, J Donnez, C A Amorim, M M Dolmans
STUDY QUESTION: Do two different concentrations of human adipose tissue-derived stem cells (ASCs) embedded inside a fibrin scaffold have the potential to differentiate into vessels and aid vascularization in a peritoneal grafting site intended for ovarian tissue transplantation? SUMMARY ANSWER: Human ASCs in low and high concentrations differentiated into vessels when transplanted to mouse peritoneum inside a fibrin matrix, but only high ASC concentrations significantly increased human vessel area 14 days after transplantation...
January 3, 2018: Human Reproduction
https://www.readbyqxmd.com/read/29304150/non-invasive-assessment-of-cerebral-oxygenation-a-comparison-of-retinal-and-transcranial-oximetry
#14
Karel Van Keer, Jan Van Keer, João Barbosa Breda, Vahid Nassiri, Cathy De Deyne, Cornelia Genbrugge, Luís Abegão Pinto, Ingeborg Stalmans, Evelien Vandewalle
BACKGROUND: To investigate the correlation between cerebral (SO2-transcranial), retinal arterial (SaO2-retinal) and venous (SvO2-retinal) oxygen saturation as measured by near-infrared spectroscopy (NIRS) and retinal oximetry respectively. METHODS: Paired retinal and cerebral oxygen saturation measurements were performed in healthy volunteers. Arterial and venous retinal oxygen saturation and diameter were measured using a non-invasive spectrophotometric retinal oximeter...
2018: PloS One
https://www.readbyqxmd.com/read/29302896/comparison-of-the-accuracy-of-noninvasive-hemoglobin-monitoring-for-preoperative-evaluation-between-adult-and-pediatric-patients-a-retrospective-study
#15
Yong-Hee Park, Seho Lim, Hyun Kang, Hwa-Yong Shin, Chong Wha Baek, Young Cheol Woo
We measured noninvasive hemoglobin (SpHb) levels during the pre-anesthesia visit in patients planning elective surgery. Differences between SpHb and laboratory-measured hemoglobin (Hblab) were compared between adult and pediatric patients. In the pre-anesthesia visiting office, we routinely monitor noninvasive Hb levels with oxygen saturation and heart rate using Masimo Radical-7® Pulse CO-Oximetry (Masimo Corp., Irvine, CA, USA). We attached the R1 20 (body weight, 10-50 kg) or R1 25 (body weight > 30 kg) probe on the index finger...
January 4, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29300109/improving-the-diagnosis-of-obstructive-sleep-apnea-in-children-with-nocturnal-oximetry-based-evaluations
#16
Annelies Van Eyck, Stijn L Verhulst
No abstract text is available yet for this article.
January 4, 2018: Expert Review of Respiratory Medicine
https://www.readbyqxmd.com/read/29295578/devices-for-ambulatory-monitoring-of-sleep-associated-disorders-in-children-with-neurological-diseases
#17
Adriana Ulate-Campos, Melissa Tsuboyama, Tobias Loddenkemper
Good sleep quality is essential for a child's wellbeing. Early sleep problems have been linked to the later development of emotional and behavioral disorders and can negatively impact the quality of life of the child and his or her family. Sleep-associated conditions are frequent in the pediatric population, and even more so in children with neurological problems. Monitoring devices can help to better characterize sleep efficiency and sleep quality. They can also be helpful to better characterize paroxysmal nocturnal events and differentiate between nocturnal seizures, parasomnias, and obstructive sleep apnea, each of which has a different management...
December 25, 2017: Children
https://www.readbyqxmd.com/read/29285649/carboxyhemoglobin-levels-induced-by-cigarette-smoking-outdoors-in-smokers
#18
Jonathan Schimmel, Naomi George, John Schwarz, Sami Yousif, Selim Suner, Jason B Hack
INTRODUCTION: Non-invasive screening of carboxyhemoglobin saturation (SpCO) in the emergency department to detect occult exposure is increasingly common. The SpCO threshold to consider exposure in smokers is up to 9%. The literature supporting this cutoff is inadequate, and the impact of active smoking on SpCO saturation remains unclear. The primary objective was to characterize baseline SpCO in a cohort of smokers outdoors. Secondary objectives were to explore the impact of active smoking on SpCO and to compare SpCO between smokers and non-smokers...
December 28, 2017: Journal of Medical Toxicology: Official Journal of the American College of Medical Toxicology
https://www.readbyqxmd.com/read/29284341/cerebral-perfusion-monitoring-in-adult-patients-following-cardiac-surgery-an-observational-study
#19
Tammy Slater, Julie Stanik-Hutt, Patricia Davidson
BACKGROUND: Strokes following adult cardiac surgery contribute to burdensome neurocognitive complications, which are often difficult to detect during the perioperative period. Fluctuations in regional cerebral perfusion and co-morbid conditions, such as hypertension, diabetes, prior stroke, symptomatic carotid stenosis, aortic atherosclerotic disease, and peripheral vascular disease are associated with perioperative strokes. Approaches to achieve optimal cerebral perfusion remain elusive and traditional strategies for perioperative monitoring are not always sufficiently sensitive to detect acute changes in cerebral perfusion...
December 28, 2017: Contemporary Nurse
https://www.readbyqxmd.com/read/29281194/the-dewey-monitor-pulse-oximetry-can-independently-detect-hypoxia-in-a-rebreather-diver
#20
Rachel M Lance, Michael J Natoli, Sophia A S Dunworth, John J Freiberger, Richard E Moon
Rebreather diving has one of the highest fatality rates per man hour of any diving activity in the world. The leading cause of death is hypoxia, typically from equipment or procedural failures. Hypoxia causes very few symptoms prior to causing loss of consciousness. Additionally, since the electronics responsible for controlling oxygen levels in rebreathers often control their alarm systems, frequently divers do not receive any external warnings. This study investigated the use of a forehead pulse oximeter as an independent warning device in the event of rebreather failure...
November 2017: Undersea & Hyperbaric Medicine: Journal of the Undersea and Hyperbaric Medical Society, Inc
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