keyword
MENU ▼
Read by QxMD icon Read
search

o2 variation index

keyword
https://www.readbyqxmd.com/read/27909604/effects-of-head-position-on-cerebral-oxygenation-and-blood-flow-velocity-during-thyroidectomy
#1
Ayten Saraçoğlu, Demet Altun, Ayşen Yavru, Nihat Aksakal, İsmail Cem Sormaz, Emre Camcı
OBJECTIVE: Determining the blood flow through intra and extra-cranial arteries during neck extension may be helpful but is a controversial issue. We aimed to elucidate the changes in cerebral blood flow related to head positioning during thyroid surgery by carotid Doppler examination and regional oxygen saturation variations. METHODS: Thirty patients were recruited to the study. Patients were positioned with a final position of thyroidectomy consisting a 30° semi Fowler with the extension of neck and head...
October 2016: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/27903339/-effect-of-goal-directed-haemodynamic-management-on-the-postoperative-outcome-in-elderly-patients-with-fragile-cardiac-function-undergoing-abdominal-surgery
#2
L S Zheng, E W Gu, X H Peng, L Zhang, Y Y Cao
Objective: To investigate the effect of goal-directed haemodynamic management based on stroke volume variation (SVV), cardiac index (CI) and mean arterial blood pressure (MAP) on the postoperative outcome in elderly patients with fragile cardiac function undergoing gastrointestinal surgery. Methods: Ninety patients with fragile cardiac function, aged 65-90 years old, ASAⅡ or Ⅲ, NYHA Ⅱor Ⅲ, scheduled for abdominal surgery were enrolled in this study.The patients were randomly assigned to two groups: Experience anesthesia group (group E, n=45) and goal-directed hemodynamic management group (G group, n=45)...
November 22, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27897995/monitoring-of-physiological-parameters-to-predict-exacerbations-of-chronic-obstructive-pulmonary-disease-copd-a-systematic-review
#3
Ahmed M Al Rajeh, John R Hurst
INTRODUCTION: The value of monitoring physiological parameters to predict chronic obstructive pulmonary disease (COPD) exacerbations is controversial. A few studies have suggested benefit from domiciliary monitoring of vital signs, and/or lung function but there is no existing systematic review. OBJECTIVES: To conduct a systematic review of the effectiveness of monitoring physiological parameters to predict COPD exacerbation. METHODS: An electronic systematic search compliant with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines was conducted...
November 25, 2016: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/27867719/monitoring-cerebral-oxygenation-and-local-field-potential-with-a-variation-of-isoflurane-concentration-in-a-rat-model
#4
Dong-Hyuk Choi, Teo Jeon Shin, Seonghyun Kim, Jayyoung Bae, Dongrae Cho, Jinsil Ham, Ji-Young Park, Hyoung-Ihl Kim, Seongwook Jeong, Boreom Lee, Jae Gwan Kim
We aimed to investigate experimentally how anesthetic levels affect cerebral metabolism measured by near-infrared spectroscopy (NIRS) and to identify a robust marker among NIRS parameters to discriminate various stages of anesthetic depth in rats under isoflurane anesthesia. In order to record the hemodynamic changes and local field potential (LFP) in the brain, fiber-optic cannulae and custom-made microelectrodes were implanted in the frontal cortex of the skull. The NIRS and LFP signals were continuously monitored before, during and after isoflurane anesthesia...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27866743/a-data-mining-framework-for-exploring-the-multi-relation-between-fish-species-and-water-quality-through-self-organizing-map
#5
Wen-Ping Tsai, Shih-Pin Huang, Su-Ting Cheng, Kwang-Tsao Shao, Fi-John Chang
The steep slopes of rivers can easily lead to large variations in river water quality during typhoon seasons in Taiwan, which may poses significant impacts on riverine eco-hydrological environments. This study aims to investigate the relationship between fish communities and water quality by using artificial neural networks (ANNs) for comprehending the upstream eco-hydrological system in northern Taiwan. We collected a total of 276 heterogeneous datasets with 8 water quality parameters and 25 fish species from 10 sampling sites...
November 17, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27826723/performance-and-mechanism-of-triclosan-removal-in-simultaneous-nitrification-and-denitrification-snd-process-under-low-oxygen-condition
#6
Junhua Liu, Jingmin Wang, Congcong Zhao, Jianing Liu, Huijun Xie, Shuning Wang, Jian Zhang, Zhen Hu
Wastewater treatment under low dissolved oxygen (DO) conditions is promising for its low energy consumption. However, the removal process of some organic micropollutants, such as triclosan (TCS), could be inhibited under anaerobic conditions. So, it is worth investigating the TCS removal performance at low-oxygen condition. In this study, simultaneous nitrification and denitrification (SND) process, with DO ranging from 0.30 to 0.80 mg L(-1), was chosen to investigate. Results showed that the water quality of the effluent was deteriorated after TCS addition at the beginning, with removal efficiency of NH4(+)-N dropped from almost 100 ± 0...
November 8, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27750131/exercise-training-effects-on-elderly-and-middle-age-patients-with-chronic-heart-failure-after-acute-decompensation-a-randomized-controlled-trial
#7
Domenico Acanfora, Pietro Scicchitano, Gerardo Casucci, Bernardo Lanzillo, Nicola Capuano, Giuseppe Furgi, Chiara Acanfora, Marialaura Longobardi, Raffaele Antonelli Incalzi, Giuseppe Piscosquito, Marco Matteo Ciccone
BACKGROUND: The aim of this study was to evaluate the effect of exercise training on cardiac function in heart failure (HF) patients recently suffering from acute decompensation. Radionuclide ambulatory ventricular function monitoring (VEST) was used to detect variations in cardiac hemodynamics during training period. METHODS: This was a monocentric, randomized, controlled trial. We enrolled 72 HF patients [left ventricle ejection fraction (LVEF) <40%] within two weeks after acute cardiogenic pulmonary edema: 40 in the elderly group, 32 in the middle-aged group...
October 11, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27748316/seasonal-fluctuation-in-the-secretion-of-the-antioxidant-melatonin-is-not-associated-with-alterations-in-sperm-dna-damage
#8
Gunilla Malm, Trine B Haugen, Lars Rylander, Aleksander Giwercman
A high sperm DNA fragmentation index (DFI) is associated with reduced fertility. DFI is influenced by the balance between reactive oxygen species and antioxidants. A circannual variation in melatonin, an antioxidant and free radical scavenger, could thus impact semen quality and fertility. The association between the major melatonin metabolite, urine 6-sulfatoxymelatonin (aMT6s), and DFI was analyzed in 110 Oslo men (south of the Arctic Circle) and 86  Tromsoe men (north of the Arctic Circle). Two semen analyses, summer and winter, and four urine samples (early/late summer; early/late winter), were analyzed...
October 14, 2016: Asian Journal of Andrology
https://www.readbyqxmd.com/read/27720494/assessment-of-changes-in-hemodynamics-and-intrathoracic-fluid-using-electrical-cardiometry-during-autologous-blood-harvest
#9
Jitin Narula, Usha Kiran, Poonam Malhotra Kapoor, Minati Choudhury, Palleti Rajashekar, Ujjwal Kumar Chowdhary
OBJECTIVE: To evaluate the effect of autologous blood harvest (ABH)-induced volume shifts using electrical cardiometry (EC) in patients with pulmonary artery hypertension secondary to left heart disease. DESIGN: Prospective, randomized, controlled trial. SETTING: A tertiary care hospital. PARTICIPANTS: The study comprised 50 patients scheduled to undergo heart valve replacement. INTERVENTIONS: Patients were divided randomly into 2 experimental groups that were distinguished by whether ABH was performed...
July 26, 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/27716694/perioperative-utility-of-goal-directed-therapy-in-high-risk-cardiac-patients-undergoing-coronary-artery-bypass-grafting-a-clinical-outcome-and-biomarker-based-study
#10
Poonam Malhotra Kapoor, Rohan Magoon, Rajinder Rawat, Yatin Mehta
Goal-directed therapy (GDT) encompasses guidance of intravenous (IV) fluid and vasopressor/inotropic therapy by cardiac output or similar parameters to help in early recognition and management of high-risk cardiac surgical patients. With the aim of establishing the utility of perioperative GDT using robust clinical and biochemical outcomes, we conducted the present study. This multicenter randomized controlled study included 130 patients of either sex, with European system for cardiac operative risk evaluation ≥3 undergoing coronary artery bypass grafting on cardiopulmonary bypass...
October 2016: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/27683805/seasonal-variation-of-limnological-features-and-trophic-state-index-of-two-oligotrophic-reservoirs-of-southeast-brazil
#11
S A Oliveira, C E M Bicudo
Limnological features of two reservoirs were studied in dry (August 2013) and rainy (January 2014) periods to evaluate the water quality that supply the city of Guarulhos, southeast Brazil. Water samples were collected in three depths and the following characteristics were measured: alkalinity, dissolved O2, free and total CO2, HCO3, soluble reactive silica, dissolved and total nitrogen and phosphorus, and chlorophyll-a. Water transparency was also measured and temperature, pH and electric conductivity profiles were obtained...
September 26, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/27649579/reliability-of-laser-doppler-near-infrared-spectroscopy-and-doppler-ultrasound-for-peripheral-blood-flow-measurements-during-and-after-exercise-in-the-heat
#12
Hui C Choo, Kazunori Nosaka, Jeremiah J Peiffer, Mohammed Ihsan, Chow C Yeo, Chris R Abbiss
This study examined the test-retest reliability of near-infrared spectroscopy (NIRS), laser Doppler flowmetry (LDF) and Doppler ultrasound to assess exercise-induced haemodynamics. Nine men completed two identical trials consisting of 25-min submaximal cycling at first ventilatory threshold followed by repeated 30-s bouts of high-intensity (90% of peak power) cycling in 32.8 ± 0.4°C and 32 ± 5% relative humidity (RH). NIRS (tissue oxygenation index [TOI] and total haemoglobin [tHb]) and LDF (perfusion units [PU]) signals were monitored continuously during exercise, and leg blood flow was assessed by Doppler ultrasound at baseline and after exercise...
September 21, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27617750/effects-of-ultratrail-running-on-skeletal-muscle-oxygenation-dynamics
#13
Gianluca Vernillo, Alfredo Brighenti, Eloisa Limonta, Pietro Trabucchi, Davide Malatesta, Grégoire P Millet, Federico Schena
PURPOSE: To quantify changes in skeletal muscle oxygenation and pulmonary O2 uptake after an extreme ultratrail running bout. METHODS: Before (PRE) and after (POST) the race (330-km, 24000 D±), profiles of vastus lateralis muscle oxygenation (i.e., oxyhaemoglobin, [O2Hb], deoxyhaemoglobin, [HHb], and tissue oxygenation index [TOI]) and O2 uptake (V̇O2) were determined in 14 athletes (EXP) and 12 control adults (CON) during two 4-min constant-load cycling bouts at power outputs of 1 (p1) and 1...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27548956/-relationship-between-the-phytoplankton-distribution-and-environmental-factors-in-fenhe-scenic-spot-of-taiyuan
#14
Jia Feng, Yu-ning Guo, Fei Wang, Jun-ping Lü, Qi Liu, Shu-lian Xie, Ge Cheng, Zhang Jian-min
In order to explore the structural characteristics of phytoplankton community and the water quality and the water quality of the Fenhe scenic spot in Taiyuan, the species composition and the biomass of phytoplankton as well as their correlation with the environmental factors were monitored. The survey selected 9 sampling sites along the up and lower reaches in Fenhe scenic spot of Taiyuan, from Chaicun Bridge to Xiangyun Bridge. During the wet season (June-Octoher) in 2014, specimens were collected, qualitative and quantitative investigation on the algae and monitoring on physicochemical indexes of the water were studied...
April 15, 2016: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/27531013/temporal-and-spatial-characteristics-of-the-water-pollutant-concentration-in-huaihe-river-basin-from-2003-to-2012-china
#15
Ming Dou, Yan Zhang, Guiqiu Li
Based on the monitoring data of 78 monitoring stations from 2003 to 2012, five key water quality indexes (biochemical oxygen demand: BOD5, permanganate index: CODMn, dissolved oxygen: DO, ammonium nitrogen: NH3-N, and total phosphorus: TP) were selected to analyze their temporal and spatial characteristics in the highly disturbed Huaihe River Basin via Mann-Kendall trend analysis and boxplot analysis. The temporal and spatial variations of water pollutant concentrations in the Huaihe River Basin were investigated and analyzed to provide a scientific basis for water pollution control, water environment protection, and ecological restoration...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27512630/characterizing-and-explaining-spatio-temporal-variation-of-water-quality-in-a-highly-disturbed-river-by-multi-statistical-techniques
#16
Jianfeng Liu, Xiang Zhang, Jun Xia, Shaofei Wu, Dunxian She, Lei Zou
Assessing the spatio-temporal variations of surface water quality is important for water environment management. In this study, surface water samples are collected from 2008 to 2015 at 17 stations in the Ying River basin in China. The two pollutants i.e. chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) are analyzed to characterize the river water quality. Cluster analysis and the seasonal Kendall test are used to detect the seasonal and inter-annual variations in the dataset, while the Moran's index is utilized to understand the spatial autocorrelation of the variables...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27507144/influences-of-anthropogenic-activities-and-topography-on-water-quality-in-the-highly-regulated-huai-river-basin-china
#17
Wei Shi, Jun Xia, Xiang Zhang
Our study analyzed the spatio-temporal trends of four major water quality parameters (i.e., dissolved oxygen (DO), ammonium nitrogen (NH3-N), total phosphorus (TP) and permanganate index (CODMn)) at 17 monitoring stations in one of the most polluted large river basins, Huai River Basin, in China during 2005 to 2014. More concerns were emphasized on the attributions, e.g., anthropogenic actives (land cover, pollution load, water temperature, and regulated flow) and natural factors (topography) to the changes in the water quality...
August 10, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27495966/effects-of-levosimendan-on-endothelial-function-and-hemodynamics-during-weaning-from-veno-arterial-extracorporeal-life-support
#18
Fabio Sangalli, Leonello Avalli, Matteo Laratta, Francesco Formica, Elena Maggioni, Rosa Caruso, Maria Cristina Costa, Marco Guazzi, Roberto Fumagalli
OBJECTIVE: Weaning from veno-arterial extracorporeal life support is challenging. The objective of this trial was to investigate the endothelial and hemodynamic effects of levosimendan in cardiogenic shock patients supported with veno-arterial extracorporeal life support. DESIGN: This was a prospective observational trial. SETTING: Cardiovascular intensive care unit of a large tertiary care university hospital in Monza, Italy. PARTICIPANTS AND INTERVENTIONS: Flow-mediated dilatation of the brachial artery and hemodynamic parameters were assessed in 10 cardiogenic shock patients supported with veno-arterial extracorporeal life support, before and after the infusion of levosimendan...
December 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/27451877/ultrasonographic-measurements-of-the-inferior-vena-cava-variation-as-a-predictor-of-fluid-responsiveness-in-patients-undergoing-anesthesia-for-surgery
#19
Xiaobao Zhang, Jiying Feng, Pin Zhu, Hengfei Luan, Yong Wu, Zhibin Zhao
BACKGROUND: Both hypovolemia and hypervolemia are connected with increased morbidity and mortality in the treatment and prognosis of patients. An accurate assessment of volume state allows the optimization of organ perfusion and oxygen supply. Recently, ultrasonography has been used to detect hypovolemia in critically ill patients and perioperative patients. The objective of our study was to assess the correlation between inferior vena cava (IVC) variation obtained with ultrasound and stroke volume variation (SVV) measured by the Vigileo/FloTrac monitor, as fluid responsiveness indicators, in patients undergoing anesthesia for surgery...
July 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27416513/thermodynamics-and-kinetics-parameters-of-co-combustion-between-sewage-sludge-and-water-hyacinth-in-co2-o2-atmosphere-as-biomass-to-solid-biofuel
#20
Limao Huang, Jingyong Liu, Yao He, Shuiyu Sun, Jiacong Chen, Jian Sun, KenLin Chang, Jiahong Kuo, Xun'an Ning
Thermodynamics and kinetics of sewage sludge (SS) and water hyacinth (WH) co-combustion as a blend fuel (SW) for bioenergy production were studied through thermogravimetric analysis. In CO2/O2 atmosphere, the combustion performance of SS added with 10-40wt.% WH was improved 1-1.97 times as revealed by the comprehensive combustion characteristic index (CCI). The conversion of SW in different atmospheres was identified and their thermodynamic parameters (ΔH,ΔS,ΔG) were obtained. As the oxygen concentration increased from 20% to 70%, the ignition temperature of SW decreased from 243...
October 2016: Bioresource Technology
keyword
keyword
85175
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"