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Oxygen saturation

Santiago Sanz-Quinto, Raúl López-Grueso, Gabriel Brizuela, Andrew A Flatt, Manuel Moya-Ramón
Sanz-Quinto, S, López-Grueso, R, Brizuela, G, Flatt, AA, and Moya-Ramón, M. Influence of training models at 3,900-m altitude on the physiological response and performance of a professional wheelchair athlete: A case study. J Strength Cond Res XX(X): 000-000, 2018-This case study compared the effects of two training camps using flexible planning (FP) vs. inflexible planning (IP) at 3,860-m altitude on physiological and performance responses of an elite marathon wheelchair athlete with Charcot-Marie-Tooth disease (CMT)...
June 20, 2018: Journal of Strength and Conditioning Research
Jeeun Kang, Emad M Boctor, Shawn Adams, Ewa Kulikowicz, Haichong K Zhang, Raymond C Koehler, Ernest M Graham
We hypothesize that noninvasive photoacoustic imaging can accurately measure cerebral venous oxyhemoglobin saturation (sO2 ) in a neonatal model of hypoxia-ischemia. In neonatal piglets, which have a skull thickness comparable to that of human neonates, we validated the noninvasive photoacoustic measurement of sagittal sinus sO2 against that measured directly by blood sampling. Systemic hypoxia was produced by decreasing inspired oxygen stepwise (i.e., 100, 21, 19, 17, 15, 14, 13, 12, 11, 10%) with or without unilateral or bilateral ligation of the common carotid arteries to enhance hypoxia-ischemia...
June 21, 2018: Journal of Applied Physiology
Paolo Salvi, Andrea Faini, Paolo Castiglioni, Fausto Brunacci, Luca Montaguti, Francesca Severi, Sylvie Gautier, Enzo Pretolani, Athanase Benetos, Gianfranco Parati
The physiological relevance of slow-wave vasomotion is still unclear, even it has been hypothesized it could be a compensatory mechanism enhancing tissue oxygenation in conditions of reduced oxygen supply. Aim of our study was to explore the effects of hypoxia and ischemia on slow-wave vasomotion in microcirculation. Peripheral oxygen saturation and forearm microcirculation flow (laser-Doppler flowmetry) were recorded at baseline and during post-occlusive reactive hyperemia in the Himalaya region from 8 European lowlanders (6 males; aged 29-39yrs) at 1350, 3400 and 5050m, and from 10 Nepalese male highlanders (aged 21-39yrs) at 3400 and 5050m of altitude...
June 21, 2018: Journal of Applied Physiology
B Bohnhorst, K Seidel, C Böhne, C Peter, S Pirr
AIM: This study compiled percentiles for cardiorespiratory parameters in healthy term neonates during quiet sleep. METHODS: We enrolled 215 healthy term neonates born at Hannover Medical School, Germany, between October 2011 and March 2013. They were prospectively observed on the maternity ward at a median age of two days using six-hour recordings of pulse oximeter plethysmography, oxygen saturation, thoracic breathing movements and electrocardiogram during sleep in a supine position...
June 21, 2018: Acta Paediatrica
O L Schjørring, A P Toft-Petersen, K H Kusk, P Mouncey, E E Sørensen, P Berezowicz, M H Bestle, H-H Bülow, H Bundgaard, S Christensen, S A Iversen, I Kirkeby-Garstad, K B Krarup, M Kruse, J H Laake, L Liboriussen, R L Laebel, M Okkonen, L M Poulsen, L Russell, F Sjövall, K Sunde, E Søreide, T Waldau, A R Walli, A Perner, J Wetterslev, B S Rasmussen
BACKGROUND: Oxygen is liberally administered in intensive care units (ICUs). Nevertheless, ICU doctors' preferences for supplementing oxygen are inadequately described. The aim was to identify ICU doctors' preferences for arterial oxygenation levels in mechanically ventilated adult ICU patients. METHODS: In April to August 2016, an online multiple-choice 17-part-questionnaire was distributed to 1080 ICU doctors in seven Northern European countries. Repeated reminder e-mails were sent...
June 21, 2018: Acta Anaesthesiologica Scandinavica
Eun Jin Kim, Chi Young Jung, Kyung Chan Kim
BACKGROUND: Bronchoalveolar lavage (BAL) is a necessary procedure for diagnosis of various lung diseases. High-flow nasal cannula (HFNC) oxygen delivery was recently introduced. This study aimed to investigate the safety and effectiveness of HFNC oxygen supply during BAL procedure in patients with acute respiratory failure (ARF). METHODS: Patients who underwent BAL while using HFNC at a partial pressure of oxygen in arterial blood/fraction of inspired oxygen (PaO₂/FiO₂; PF) ratio of 300 or below among patients who had been admitted from March 2013 to May 2017 were retrospectively investigated...
June 19, 2018: Tuberculosis and Respiratory Diseases
Kensuke Kobayashi, Tadashi Kitamura, Satoshi Kohira, Shinzo Torii, Toshiaki Mishima, Hirotoki Ohkubo, Yuki Tanaka, Akihiro Sasahara, Takuma Fukunishi, Yuki Ohtomo, Rihito Horikoshi, Yuta Murai, Kagami Miyaji
Regional cerebral oximetry using near-infrared spectroscopy devices is commonly used for detecting cerebral ischemia during cardiopulmonary bypass, and aim to avoid poor cerebral perfusion which may result in perioperative neurological impairment. Today, several devices that can detect cerebral ischemia are commercially available. Although these devices operate on the same measurement principles, their algorithms for detecting and calculating cerebral ischemia are different and no criteria for directly comparing values measured by such different devices exist...
June 20, 2018: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
Thomas E Bachman, Christopher J L Newth, Narayan P Iyer, Patrick A Ross, Robinder G Khemani
OBJECTIVE: Describe the likelihood of hypoxemia and hyperoxemia across ranges of oxygen saturation (SpO2 ), during mechanical ventilation with supplemental oxygenation. DESIGN: Retrospective observational study. SETTING: University affiliated tertiary care neonatal intensive care unit. PATIENTS: Two groups of neonates based on postmenstrual age (PMA): <32 weeks (n=104) and >36 weeks (n=709). MAIN MEASURES: Hypoxemia was defined as a PaO2 <40 mm Hg, hyperoxemia as a PaO2 of >99 mm Hg and normoxemia as a PaO2 of 50-80 mm Hg...
June 20, 2018: Archives of Disease in Childhood. Fetal and Neonatal Edition
Jihion Yu, Jun Hyuk Hong, Jun-Young Park, Jai-Hyun Hwang, Seong-Sik Cho, Young-Kug Kim
BACKGROUND: Robot-assisted laparoscopic prostatectomy (RALP) requires pneumoperitoneum and the Trendelenburg position to optimize surgical exposure, which can increase intracranial pressure (ICP). Anesthetic agents also influence ICP. We compared the effects of propofol and sevoflurane on sonographic optic nerve sheath diameter (ONSD) as a surrogate for ICP in prostate cancer patients who underwent RALP. METHODS: Thirty-six patients were randomly allocated to groups receiving propofol (propofol group, n = 18) or sevoflurane (sevoflurane group, n = 18) anesthesia...
June 20, 2018: BMC Anesthesiology
Joshua Good, Eric Viana, Kirsten A Burgomaster, Shilpa Dogra
The purpose was to compare the airway response to sprint interval exercise (SIE) and continuous exercise (CE) in active adults with exercise-induced bronchoconstriction (EIBC), and to compare ventilatory and oxygen delivery responses between adults with and without EIBC. Adults with EIBC (n = 8, 22.3 ± 3.0 years) and adults without EIBC (n = 8, 22.3 ± 3.0 years) completed a SIE (4 × 30 s sprints separated by 4.5 min of active recovery) and CE (20 min at 65% peak power output) session. Lung function was assessed at baseline, during exercise, and up to 20 min post-exercise...
June 20, 2018: Journal of Sports Sciences
Jenny Lundeberg, John R Feiner, Andrew Schober, Jeffrey W Sall, Helge Eilers, Philip E Bickler
Lundeberg, Jenny, John R. Feiner, Andrew Schober, Jeffrey W. Sall, Helge Eilers, and Philip E. Bickler. Increased cytokines at high altitude: lack of effect of ibuprofen on acute mountain sickness, physiological variables or cytokine levels. High Alt Med Biol. 00:000-000, 2018. INTRODUCTION: There is no consensus on the role of inflammation in high-altitude acclimatization. AIMS: To determine the effects of a nonsteroidal anti-inflammatory drug (ibuprofen 400 mg every 8 hours) on blood cytokines, acclimatization, acute mountain sickness (AMS, Lake Louise Score), and noninvasive oxygenation in brain and muscle in healthy volunteers...
June 20, 2018: High Altitude Medicine & Biology
Masaru Kobayashi, Shinya Fukuda, Ken-Ichi Takano, Junji Kamizono, Kotaro Ichikawa
To determine whether a peripheral capillary oxygen saturation (SpO2) of 95% to 96% should be considered "nonurgent" in school-aged children, as suggested by the Canadian Emergency Department Triage and Acuity Scale.School-aged children (6-12 years old) with a normal body temperature (36.5-37.4°C) who visited our department between September, 2014 and August, 2015 (n = 4556) were divided into 4 groups based on SpO2: group A: 99% to 100%; group B: 97% to 98%; group C: 95% to 96%; and group D: ≤94%...
June 2018: Medicine (Baltimore)
Zhengfeng Gu, Lian Xin, Zhiping Wang, Jun Wang
INTRODUCTION: Congenital heart disease and pulmonary arterial hypertension are perilous to a gravida for the high morbidity and mortality. CASE PRESENTATION: We report an extremely rare case of a 27-year-old gravida with congenital heart disease and severe pulmonary arterial hypertension of 115 mmHg. Arterial blood gas analysis revealed her oxygen saturation (SpO2) of 67.8% and oxygen partial pressure of 40.0 mmHg, which were severely low. The patient was diagnosed as having gestation combined with congenital heart disease, severe pulmonary arterial hypertension, and hypoxemia...
June 2018: Medicine (Baltimore)
Lim Beng Leong, Ng Wei Ming, Lee Wei Feng
We reviewed the use of noninvasive ventilation (NIV) versus high flow nasal cannula (HFNC) oxygen in adult acute respiratory failure (ARF). We searched major databases and included randomized trials comparing at least NIV with HFNC or NIV+HFNC with NIV in ARF. Primary outcomes included intubation/re-intubation rates. Secondary outcomes were ICU mortality and morbidities. Five trials were included; three compared HFNC with NIV, one compared HFNC, NIV and oxygen whereas one compared HFNC+NIV with NIV. Patients had hypoxaemic ARF (PaO2/FiO2≤300 mmHg)...
June 19, 2018: European Journal of Emergency Medicine: Official Journal of the European Society for Emergency Medicine
Suzanne Broadbent, Sonja Coetzee, Rosalind Beavers
PURPOSE: This pilot pre-and post-intervention study investigated the effects of a short-term aquatic exercise programme on physiological outcomes, symptoms and exercise capacity in women with chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME). METHODS: Eleven women (54.8 ± 12.4 year) volunteered for the 5-week program; an initial 20-min aquatic exercise session then two self-paced 20-min sessions per week for 4 weeks. Pre- and post-intervention outcomes were physiological measures, 6 min Walk Test (6MWT), perceived exertion (RPE), hand grip strength, Sit-to-Stand, Sit-Reach test, Apley's shoulder test, FACIT questionnaire, and 24-h post-test tiredness and pain scores (0-10 visual analogue scale)...
June 19, 2018: European Journal of Applied Physiology
Elodie Gautier-Veyret, Magnus Bäck, Claire Arnaud, Elise Belaïdi, Renaud Tamisier, Patrick Lévy, Nathalie Arnol, Marion Perrin, Jean-Louis Pépin, Françoise Stanke-Labesque
AIMS: Obstructive sleep apnea (OSA) characterized by nocturnal intermittent hypoxia (IH) is associated with atherosclerosis and cysteinyl-leukotrienes (CysLT) pathway activation. We aimed to identify the determinants of CysLT pathway activation and the role of CysLT in OSA-related atherosclerosis. METHODS AND RESULTS: Determinants of the urinary excretion of LTE4 (U-LTE4 ) including history of cardiovascular events, polysomnographic and biological parameters were studied in a cohort of 170 OSA patients and 29 controls, and in a subgroup of OSA patients free of cardiovascular event (n = 136)...
June 16, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
X-L Yi, J-T Wang, C-Q Chu, Y-X Li, J-H Yin, S-L Liu
OBJECTIVE: To explore the cardiocerebral protective effect of dexmedetomidine as an anesthetic in colorectal cancer surgery. PATIENTS AND METHODS: A total of 246 colorectal cancer patients were enrolled in this retrospective analysis. Those patients were admitted to the Affiliated Hospital of Qingdao University and underwent surgery from July 2014 to July 2016. The patients were divided into observation group and control group according to the anesthetic used in surgery...
June 2018: European Review for Medical and Pharmacological Sciences
Robert H Thiele, Keita Ikeda, Hari P Osuru, Zhiyi Zuo
BACKGROUND: Cytochrome aa3, the terminal component of the electron transport chain, absorbs near-infrared radiation (NIR) differentially depending on its oxidation state (Cytox), which can in theory be measured using near-infrared spectroscopy (NIRS) by relating light absorption at specific wavelengths to chromophore concentrations. Some NIRS algorithms use discrete wavelengths, while others analyze a band of NIR (broadband NIRS). The purpose of this study was to test the ability of discrete wavelength and broadband algorithms to measure changes in Cytox (primary outcome), and to determine whether or not a discreet wavelength NIRS algorithm could perform similarly to a broadband NIRS algorithm for the measurement of Cytox in a staged hypoxia-cyanide model (hypoxia and cyanide have oppositional effects on tissue saturation, but both cause cytochrome reduction)...
June 14, 2018: Anesthesia and Analgesia
Wolf-Ulrich Palm
Dark and photolysis reactions in solution were investigated for 9-acridinecarboxaldehyde (ACL). ACL reacts in the dark at T = 20 °C and pH = 7.0 in an air saturated solution to the main product 9-acridinecarboxylic acid (ACA) and to the minor product 9-acridinemethanol (ACM) with a lifetime of τ = 4.3 days. The dissociation constant of the base ACLH+ was determined to be pKa ± σ = 4.38 ± 0.04. The photolysis of ACL was investigated using a polychromatic Xe-light source. The quantum yield in aqueous solution at T = 20 °C in a concentration range of c0(ACL) = 0...
June 19, 2018: Photochemical & Photobiological Sciences
Jing Kang, Zongsheng Tian, Mingxian Li
The aim of this study was to investigate the changes in insular cortex metabolites and the correlation with clinical manifestations in patients with obstructive sleep apnea syndrome (OSA). Lateral insular metabolite levels were measured and relevant ratios were calculated in OSA patients and healthy individuals, including N-acetyl aspartate/creatine (NAA/Cr), choline/creatine (Cho/Cr), inositol/creatine (Ins/Cr), glutamate compound/creatine (Glx/Cr), N-acetyl aspartate/choline (NAA/Cho), and lactic acid (Lac)...
June 15, 2018: Neuroreport
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