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https://www.readbyqxmd.com/read/28929529/correlation-between-myocardial-deformation-on-three-dimensional-speckle-tracking-echocardiography-and-cardiopulmonary-exercise-testing
#1
Mei Li, Yaran Lu, Cui Fang, Xiaorong Zhang
PURPOSE: Heart failure (HF) is a multifactorial entity that combines derangements in both systolic and diastolic function. The relationship between systolic and diastolic function and exercise capacity is not fully understood. We sought to determine the mechanisms linking cardiac function and exercise tolerance in patients with HF. METHODS: One hundred fifty-six subjects with different cardiac function levels were included in the study. Subjects' 2D echocardiographic, 3D speckle tracking echocardiographic, and cardiopulmonary exercise testing (CPET) data were collected...
September 19, 2017: Echocardiography
https://www.readbyqxmd.com/read/28928674/the-gly-16-allele-of-the-g16r-single-nucleotide-polymorphism-in-the-%C3%AE-2-adrenergic-receptor-gene-augments-the-glycemic-response-to-adrenaline-in-humans
#2
Kim Z Rokamp, Jonatan M Staalsø, Morten Zaar, Peter Rasmussen, Lonnie G Petersen, Rikke V Nielsen, Niels H Secher, Niels V Olsen, Henning B Nielsen
Cerebral non-oxidative carbohydrate consumption may be driven by a β2-adrenergic mechanism. This study tested whether the 46G > A (G16R) single nucleotide polymorphism of the β2-adrenergic receptor gene (ADRB2) influences the metabolic and cerebrovascular responses to administration of adrenaline. Forty healthy Caucasian men were included from a group of genotyped individuals. Cardio- and cerebrovascular variables at baseline and during a 60-min adrenaline infusion (0.06 μg kg(-1) min(-1)) were measured by Model flow, near-infrared spectroscopy and transcranial Doppler sonography...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28887766/short-term-effects-of-passive-mobilization-on-the-sublingual-microcirculation-and-on-the-systemic-circulation-in-patients-with-septic-shock
#3
Tuanny Teixeira Pinheiro, Flávio Geraldo Rezende de Freitas, Karla Tuanny Fiorese Coimbra, Vanessa Marques Ferreira Mendez, Heloísa Baccaro Rossetti, Paulo Vinicius Talma, Antônio Tonete Bafi, Flávia Ribeiro Machado
BACKGROUND: Active mobilization is not possible in patients under deep sedation and unable to follow commands. In this scenario, passive therapy is an interesting alternative. However, in patients with septic shock, passive mobilization may have risks related to increased oxygen consumption. Our objective was to evaluate the impact of passive mobilization on sublingual microcirculation and systemic hemodynamics in patients with septic shock. METHODS: We included patients who were older than 18 years, who presented with septic shock, and who were under sedation and mechanical ventilation...
September 8, 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28886543/assessing-river-water-quality-using-water-quality-index-in-lake-taihu-basin-china
#4
Zhaoshi Wu, Xiaolong Wang, Yuwei Chen, Yongjiu Cai, Jiancai Deng
Lake Taihu Basin, one of the most developed regions in China, has received considerable attention due to its severe pollution. Our study provides a clear understanding of the water quality in the rivers of Lake Taihu Basin based on basin-scale monitoring and a water quality index (WQI) method. From September 2014 to January 2016, four samplings across four seasons were conducted at 96 sites along main rivers. Fifteen parameters, including water temperature, pH, dissolved oxygen (DO), conductivity, turbidity (tur), permanganate index (CODMn), total nitrogen, total phosphorus, ammonium (NH4-N), nitrite, nitrate (NO3-N), calcium, magnesium, chloride, and sulfate, were measured to calculate the WQI...
September 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28885215/hyperspectral-imaging-as-a-novel-diagnostic-tool-in-microcirculation-of-wounds
#5
Georg Daeschlein, Inga Langner, Thomas Wild, Sebastian von Podewils, Claudia Sicher, Thomas Kiefer, Michael Jünger
Monitoring of perfusion is a cornerstone in surgery, phlebology and basic science to proof wound healing by interventions. In chronic wound management it is of utmost importance to realize and parametrize wound bed perfusion to verify actual, and plan further treatment by noninvasive diagnostics. Up to now monitoring is based on visual inspection of wounds as conventionally practiced over more than decades. The main problems of visual inspection are the lack of standardization and comparability because of interindividual variations...
September 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28868051/distinct-seasonal-patterns-of-bacterioplankton-abundance-and-dominance-of-phyla-%C3%AE-proteobacteria-and-cyanobacteria-in-qinhuangdao-coastal-waters-off-the-bohai-sea
#6
Yaodong He, Biswarup Sen, Shuangyan Zhou, Ningdong Xie, Yongfeng Zhang, Jianle Zhang, Guangyi Wang
Qinhuangdao coastal waters in northern China are heavily impacted by anthropogenic and natural activities, and we anticipate a direct influence of the impact on the bacterioplankton abundance and diversity inhabiting the adjacent coastal areas. To ascertain the anthropogenic influences, we first evaluated the seasonal abundance patterns and diversity of bacterioplankton in the coastal areas with varied levels of natural and anthropogenic activities and then analyzed the environmental factors which influenced the abundance patterns...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28857852/effects-of-high-flow-nasal-cannula-on-the-work-of-breathing-in-patients-recovering-from-acute-respiratory-failure
#7
Mathieu Delorme, Pierre-Alexandre Bouchard, Mathieu Simon, Serge Simard, François Lellouche
OBJECTIVES: High-flow nasal cannula is increasingly used in the management of respiratory failure. However, little is known about its impact on respiratory effort, which could explain part of the benefits in terms of comfort and efficiency. This study was designed to assess the effects of high-flow nasal cannula on indexes of respiratory effort (i.e., esophageal pressure variations, esophageal pressure-time product/min, and work of breathing/min) in adults. DESIGN: A randomized controlled crossover study was conducted in 12 patients with moderate respiratory distress (i...
August 28, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28856363/modelling-oxygen-defects-in-orthorhombic-lamno3-and-its-low-index-surfaces
#8
Ailbhe L Gavin, Graeme W Watson
LaMnO3-based perovskites, which have been extensively studied as cathodes for high temperature solid oxide fuel cells (SOFCs), are also of interest for intermediate temperature SOFCs (T = 600-1000 K). Oxygen vacancy formation is required in LaMnO3 for oxygen diffusion, therefore a low vacancy formation energy is preferable. The stability of the low index surfaces of orthorhombic LaMnO3 has been investigated, with the {010} surface found to be the most stable. Surface stability was found to be affected by the La and Mn coordination, and the Mn-O bonds cleaved on surface formation...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28822008/label-free-sensing-and-classification-of-old-stored-blood
#9
Jun Hong Park, Taesik Go, Sang Joon Lee
Transfusion is crucial in surgical operation and anemia treatment. However, several hemorheological properties of blood are adversely altered during blood storage. After transfusion, these adverse alterations are related with decrease of oxygen and ion transport in blood circulation, which increase the mortality of transfused patients. Therefore, accurate sensing of whether a blood supply is still viable for transfusion or not is extremely important. In this study, a H-shaped microfluidic device and digital in-line holographic microscopy were employed to measure temporal variations of blood viscosity and the optical focusing property of erythrocytes during blood storage...
August 18, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28767746/exogenous-catalase-and-pyruvate-dehydrogenase-improve-survival-and-regeneration-and-affect-oxidative-stress-in-cryopreserved-dendrobium-nobile-protocorm-like-bodies
#10
W Di, M X Jia, J Xu, B L Li, Y Liu
BACKGROUND: Reactive oxygen species (ROS)-induced oxidative damage is responsible for viability loss in plant tissues following cryopreservation. Antioxidants may improve viability by preventing or repairing the injury. OBJECTIVE: This work aimed at studying the effect of catalase (CAT) and pyruvate dehydrogenase (PDH), which are involved in ROS metabolism and are differentially expressed during pollen cryopreservation, for cryopreservation of Dendrobium nobile Lindl...
May 2017: Cryo Letters
https://www.readbyqxmd.com/read/28697778/electrical-impedance-tomography-for-predicting-failure-of-spontaneous-breathing-trials-in-patients-with-prolonged-weaning
#11
Johannes Bickenbach, Michael Czaplik, Mareike Polier, Gernot Marx, Nikolaus Marx, Michael Dreher
BACKGROUND: Spontaneous breathing trials (SBTs) on a T-piece can be difficult in patients with prolonged weaning because of remaining de-recruitment phenomena and/or insufficient ventilation. There is no clinically established method existent other than experience for estimating whether an SBT is most probably beneficial. Electrical impedance tomography (EIT) is a clinical useful online monitoring technique during mechanical ventilation, particularly because it enables analysis of effects of regional ventilation distribution...
July 12, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28690287/stroke-volume-variation-svv-and-pulse-pressure-variation-ppv-as-indicators-of-fluid-responsiveness-in-sevoflurane-anesthetized-mechanically-ventilated-euvolemic-dogs
#12
Yusuke Endo, Jun Tamura, Tomohito Ishizuka, Takaharu Itami, Kiwamu Hanazono, Kenjiro Miyoshi, Tadashi Sano, Kazuto Yamashita, William W Muir
Changes in stroke volume variation (SVV) and pulse pressure variation (PPV) in response to fluid infusion were experimentally evaluated during vecuronium infusion and sevoflurane anesthesia in 5 adult, mechanically ventilated, euvolemic, beagle dogs. Sequential increases in central venous pressure (CVP; 3-7[baseline], 8-12, 13-17, 18-22 and 23-27 mmHg) were produced by infusing lactated Ringer's solution and 6% hydroxyethyl starch solution. Heart rate (beats/min), right atrial pressure (RAP, mmHg), pulmonary arterial pressure (PAP, mmHg), pulmonary capillary wedge pressure (PCWP, mmHg), transpulmonary thermodilution cardiac output (TPTDCO, l/min), stroke volume (SV, ml/beat), arterial blood pressure (ABP, mmHg), extravascular lung water (EVLW, ml), pulmonary vascular permeability index (PVPI, calculated), SVV (%), PPV (%) and systemic vascular resistance (SVR, dynes/sec/cm(5)) were determined at each predetermined CVP range...
August 18, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28613960/the-effect-of-air-pollution-on-diurnal-variation-of-performance-in-anaerobic-tests-cardiovascular-and-hematological-parameters-and-blood-gases-on-soccer-players-following-the-yo-yo-intermittent-recovery-test-level-1
#13
Nesrin Boussetta, Salma Abedelmalek, Khouloud Aloui, Nizar Souissi
This study aimed to investigate the effect of air pollution on diurnal variation of performance in anaerobic tests, cardiovascular and hematological parameters, and blood gases on soccer players following the Yo-Yo Intermittent Recovery Test Level-1 (YYIRT1). In a randomized order, 11 healthy soccer players (mean age: 21.8 [range: 20-24] years; height: 178.00 [range: 1.64-1.83] cm; body mass index [BMI]: 23.57 [range: 20.45-28.03] kg.m(-2)) performed a YYIRT1 at two different times of day (TOD) (08:00 h and 18:00 h) in two areas (i...
June 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28584212/variations-of-postresuscitation-lung-function-after-thrombolysis-therapy-in-a-cardiac-arrest-porcine-model-caused-by-pulmonary-thromboembolism
#14
Jun Yang, Lian-Xing Zhao, Chun-Sheng Li, Nan Tong, Hong-Li Xiao, Le An
BACKGROUND: Study of lung function in survivor from cardiac arrest (CA) caused by pulmonary thromboembolism (PTE) was rare. The aim of this study was to investigate the variations of postresuscitation lung function after thrombolysis treatment in a CA porcine model caused by PTE. METHODS: After 2 min of untreated CA, pigs of 10-12 weeks with a weight of 30 ± 2 kg (n = 24) were treated with recombinant human tissue plasminogen activator (50 mg). Cardiopulmonary resuscitation (CPR) and ventilation were initiated after drug administration...
June 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28571859/development-of-a-method-for-comprehensive-water-quality-forecasting-and-its-application-in-miyun-reservoir-of-beijing-china
#15
Lei Zhang, Zhihong Zou, Wei Shan
Water quality forecasting is an essential part of water resource management. Spatiotemporal variations of water quality and their inherent constraints make it very complex. This study explored a data-based method for short-term water quality forecasting. Prediction of water quality indicators including dissolved oxygen, chemical oxygen demand by KMnO4 and ammonia nitrogen using support vector machine was taken as inputs of the particle swarm algorithm based optimal wavelet neural network to forecast the whole status index of water quality...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28565933/comparing-executive-function-evoked-hemodynamic-response-and-gait-as-predictors-of-variations-in-mobility-for-older-adults
#16
Drew W R Halliday, Sandra R Hundza, Mauricio A Garcia-Barrera, Marc Klimstra, Drew Commandeur, Timothy V Lukyn, Robert S Stawski, Stuart W S MacDonald
OBJECTIVE: Falls represent a major concern for older adults and may serve as clinically salient index events for those presenting in the prodromal stages of mild cognitive impairment. Declines in executive function performance and in gait consistency have shown promise in predicting fall risk; however, associated neurophysiological underpinnings have received less attention. In this study, we used a multimodal approach to assess fall risk in a group of older adults with and without a previous fall history...
May 31, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28560835/a-comparison-of-pulse-oximetry-and-cerebral-oxygenation-in-children-with-severe-sleep-apnea-hypopnea-syndrome-a-pilot-study
#17
Jorge Olmo Arroyo, Sonia Khirani, Alessandro Amaddeo, Lucie Griffon, Livio De Sanctis, Philippe Pouard, Brigitte Fauroux
Near infrared spectroscopy (NIRS) has been used to assess the impact of obstructive sleep apnea-hypopnea syndrome (OSAHS) on cerebral oxygenation. However, the relationship between the variations in the cerebral tissue oxygen saturation (ΔTOI) and pulse oximetry (ΔSpO2 ) has not been assessed in children with OSAHS. Consecutive clinically stable children with severe OSAHS [apnea-hypopnea index (AHI) >15 events h(-1) ] diagnosed during a night-time polygraphy with simultaneous recording of cerebral oxygenation with NIRS (NIRO-200NX, Hamamatsu Photonics KK) were included between September 2015 and June 2016...
May 31, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28548301/night-to-night-variability-of-obstructive-sleep-apnea
#18
Anna S Stöberl, Esther I Schwarz, Sarah R Haile, Christopher D Turnbull, Valentina A Rossi, John R Stradling, Malcolm Kohler
One night of a sleep study is the standard for diagnosis and exclusion of obstructive sleep apnea. Single testing requires high sensitivity of the test method and a stable disease of interest to warrant a low rate of false-negative tests. Obstructive sleep apnea is diagnosed and graded by conventional thresholds of apneas and hypopneas per hour of sleep, and treatment is usually initiated in the presence of symptoms. The aim of this study was to assess night-to-night variability of obstructive sleep apnea to reassess the current practice...
May 26, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28527350/bi-dimensional-variational-mode-decomposition-of-laser-speckle-contrast-imaging-data-a-clinical-approach-to-critical-limb-ischemia
#19
Anne Humeau-Heurtier, Pierre Abraham, Samir Henni
The number of patients suffering from peripheral arterial occlusive disease (PAOD) is growing worldwide. PAOD corresponds to an impairment of perfusion in the distal portion of some arteries that can generate critical limb ischemia. For some patients, the pathology leads to the necessity of amputation. PAOD may be diagnosed and studied with transcutaneous oxygen (tcpO2) measurements. However, the tcpO2 technique is a contact technique: probes have to be positioned on the limb, which may be impossible in case of ulcers and can lead to infection risks...
July 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28513178/decoupling-the-effects-of-mass-density-and-hydrogen-oxygen-and-aluminum-based-defects-on-optoelectronic-properties-of-realistic-amorphous-alumina
#20
Vanessa Riffet, Julien Vidal
The search for functional materials is currently hindered by the difficulty to find significant correlation between constitutive properties of a material and its functional properties. In the case of amorphous materials, the diversity of local structures, chemical composition, impurities and mass densities makes such a connection difficult to be addressed. In this Letter, the relation between refractive index and composition has been investigated for amorphous AlOx materials, including nonstoichiometric AlOx, emphasizing the role of structural defects and the absence of effect of the band gap variation...
May 22, 2017: Journal of Physical Chemistry Letters
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