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Fluid balance

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https://www.readbyqxmd.com/read/28322219/two-dimensional-turbulence-in-symmetric-binary-fluid-mixtures-coarsening-arrest-by-the-inverse-cascade
#1
Prasad Perlekar, Nairita Pal, Rahul Pandit
We study two-dimensional (2D) binary-fluid turbulence by carrying out an extensive direct numerical simulation (DNS) of the forced, statistically steady turbulence in the coupled Cahn-Hilliard and Navier-Stokes equations. In the absence of any coupling, we choose parameters that lead (a) to spinodal decomposition and domain growth, which is characterized by the spatiotemporal evolution of the Cahn-Hilliard order parameter ϕ, and (b) the formation of an inverse-energy-cascade regime in the energy spectrum E(k), in which energy cascades towards wave numbers k that are smaller than the energy-injection scale kin j in the turbulent fluid...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28321352/an-office-based-fluid-to-fluid-exchange-technique-for-the-treatment-of-postvitrectomy-vitreous-cavity-hemorrhage-and-secondary-glaucoma
#2
Sergio E Hernandez-Da Mota
A case of postvitrectomy hemorrhage with secondary glaucoma successfully treated with an office-based fluid to fluid exchange is described. A 25 Ga trocar was placed 3 mm from the sclerocorneal limbus at the 2 o'clock position and connected to a 250 cc elevated bottle of balanced salt solution (BSS) through an intravenous (IV) line and an infusion cannula. Afterward, a 25 Ga needle was inserted 3 mm from the limbus at the 5 o'clock position approximately. The BSS fluid entered the eye through the 25 Ga trocar lavaging the vitreous cavity and the anterior chamber...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28321321/associations-between-fluid-balance-and-outcomes-in-critically-ill-children-a-protocol-for-a-systematic-review-and-meta-analysis
#3
Rashid Alobaidi, Catherine Morgan, Rajit K Basu, Erin Stenson, Robin Featherstone, Sumit R Majumdar, Sean M Bagshaw
BACKGROUND: Fluid therapy is a mainstay during the resuscitation of critically ill children. After initial stabilization, excessive fluid accumulation may lead to complications of fluid overload, which has been independently associated with increased risk for mortality and major morbidity in critically ill children. OBJECTIVES: Perform an evidence synthesis to describe the methods used to measure fluid balance, define fluid overload, and evaluate the association between fluid balance and outcomes in critically ill children...
2017: Canadian Journal of Kidney Health and Disease
https://www.readbyqxmd.com/read/28320893/regional-differences-in-nutrient-induced-secretion-of-gut-serotonin
#4
Alyce M Martin, Amanda L Lumsden, Richard L Young, Claire F Jessup, Nick J Spencer, Damien J Keating
Enterochromaffin (EC) cells located in the gastrointestinal (GI) tract provide the vast majority of serotonin (5-HT) in the body and constitute half of all enteroendocrine cells. EC cells respond to an array of stimuli, including various ingested nutrients. Ensuing 5-HT release from these cells plays a diverse role in regulating gut motility as well as other important responses to nutrient ingestion such as glucose absorption and fluid balance. Recent data also highlight the role of peripheral 5-HT in various pathways related to metabolic control...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28317673/effect-of-balanced-phacoemulsification-tip-on-the-outcomes-of-torsional-phacoemulsification-using-an-active-fluidics%C3%A2-system
#5
Sudarshan Khokhar, Neelima Aron, Sagnik Sen, Ganesh Pillay, Esha Agarwal
PURPOSE: To compare the outcomes of torsional phacoemulsification with a new balanced tip (Intrepid) and a conventional tip (Kelman) using a single active-fluidics torsional phacoemulsification machine (Centurion). SETTING: Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. DESIGN: Prospective comparative case-control study. METHODS: Patients with senile cataract had torsional phacoemulsification with the Kelman conventional tip or the new Intrepid balanced tip using the active-fluidics torsional machine...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28316054/the-effect-of-fluid-intake-following-dehydration-on-subsequent-athletic-and-cognitive-performance-a-systematic-review-and-meta-analysis
#6
REVIEW
Danielle McCartney, Ben Desbrow, Christopher Irwin
BACKGROUND: The deleterious effects of dehydration on athletic and cognitive performance have been well documented. As such, dehydrated individuals are advised to consume fluid in volumes equivalent to 1.25 to 1.5 L kg(-1) body mass (BM) lost to restore body water content. However, individuals undertaking subsequent activity may have limited time to consume fluid. Within this context, the impact of fluid intake practices is unclear. This systematic review investigated the effect of fluid consumption following a period of dehydration on subsequent athletic and cognitive performance...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28303206/post-irradiation-lumbosacral-radiculopathy-associated-with-multiple-cavernous-malformations-of-the-cauda-equina-case-report-and-review-of-the-literature
#7
Doniel Drazin, Ari Kappel, Stefan Withrow, Tiffany Perry, Ray Chu, Surasak Phuphanich
BACKGROUND: Multiple radiation-induced cavernous malformations of the cauda equina are extremely rare. A review of the literature suggested that the post-irradiation lumbosacral radiculopathy in our patient was most likely associated with a diagnosis of multiple radiation-induced cavernous malformations of the cauda equina. CASE DESCRIPTION: A 76-year-old man with a remote history of abdominal radiation therapy presented with a 6-month history of progressively worsening right foot drop and balance impairment...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28302179/balanced-crystalloids-versus-saline-in-the-intensive-care-unit-study-protocol-for-a-cluster-randomized-multiple-crossover-trial
#8
Matthew W Semler, Wesley H Self, Li Wang, Daniel W Byrne, Jonathan P Wanderer, Jesse M Ehrenfeld, Joanna L Stollings, Avinash B Kumar, Antonio Hernandez, Oscar D Guillamondegui, Addison K May, Edward D Siew, Andrew D Shaw, Gordon R Bernard, Todd W Rice
BACKGROUND: Saline, the intravenous fluid most commonly administered to critically ill adults, contains a high chloride content, which may be associated with acute kidney injury and death. Whether using balanced crystalloids rather than saline decreases the risk of acute kidney injury and death among critically ill adults remains unknown. METHODS: The Isotonic Solutions and Major Adverse Renal Events Trial (SMART) is a pragmatic, cluster-level allocation, cluster-level crossover trial being conducted between 1 June 2015 and 30 April 2017 in five intensive care units at Vanderbilt University Medical Center in Nashville, TN, USA...
March 16, 2017: Trials
https://www.readbyqxmd.com/read/28295948/nurses-experiences-of-delivering-care-in-acute-inpatient-mental-health-settings-a-narrative-synthesis-of-the-literature
#9
REVIEW
Marianne Wyder, Carolyn Ehrlich, David Crompton, Leianne McArthur, Caroline Delaforce, Fiona Dziopa, Shulamit Ramon, Elizabeth Powell
Inpatient psychiatric care requires a balance between working with consumers' priorities and goals, managing expectations of the community, legal, professional and service responsibilities. In order to improve service delivery within acute mental health units, it is important to understand the constraints and facilitating factors for good care. We conducted a systematic narrative synthesis, where findings of qualitative studies are synthesised to generate new insights. 21 articles were identified. Our results show that personal qualities, professional skills as well as environmental factors all influence the ability to provide recovery focused care...
March 14, 2017: International Journal of Mental Health Nursing
https://www.readbyqxmd.com/read/28294580/effect-of-cerebrospinal-fluid-modelling-on-spherically-convergent-shear-waves-during-blunt-head-trauma
#10
Amit Madhukar, Ying Chen, Martin Ostoja-Starzewski
The MRI-based computational model, previously validated by tagged MRI and HARP imaging analysis technique on in vivo human brain deformation, is employed to study transient wave dynamics during blunt head trauma. Three different constitutive models are used for the cerebrospinal fluid (CSF): incompressible solid elastic, viscoelastic and fluid-like elastic using an equation of state model. Three impact cases are simulated which indicate that the blunt impacts give rise not only to a fast pressure wave but also to a slow, and potentially much more damaging, shear (distortional) wave that converges spherically towards the brain center...
March 14, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28292596/why-biphasic-assessment-of-the-effect-on-cell-proliferation-and-expression
#11
Pierre Schembri-Wismayer, Josette Camilleri
INTRODUCTION: Tricalcium silicate (TCS)-based materials are used in endodontics because they are hydraulic and interact with blood, tissue fluids, and phosphate-based root canal irrigants, resulting in biomineralization. Newer-generation materials are biphasic; calcium phosphate is added to the TCS; thus, the material has 2 cementitious phases. The effect of this addition is not known; thus, the aim of this study was to characterize biphasic cements and assess cellular proliferation and expression...
March 11, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28289333/influence-of-vaginal-lactoferrin-administration-on-amniotic-fluid-cytokines-and-its-role-against-inflammatory-complications-of-pregnancy
#12
Martina Maritati, Manola Comar, Nunzia Zanotta, Silva Seraceni, Alessandro Trentini, Fabrizio Corazza, Fortunato Vesce, Carlo Contini
BACKGROUND: An altered amniotic cytokine profile has been reported in inflammatory pregnancy complications with a leading role for IL-6, a marker of the foetal systemic inflammatory response. Up to this date there is no exhaustive information neither on the foetal cytokine balance nor on the best method for its modulation. We aimed to evaluate the influence of vaginal lactoferrin administration on amniotic fluid concentration of 47 cytokines, chemokines and growth factors. METHODS: Sixty women undergoing genetic amniocentesis were enrolled in an open-label clinical trial...
2017: Journal of Inflammation
https://www.readbyqxmd.com/read/28283476/alveolar-non-selective-channels-are-asic1a-%C3%AE-enac-channels-and-contribute-to-afc
#13
Phi T Trac, Tiffany L Thai, Valerie Linck, Li Zou, Megan M Greenlee, Qiang Yue, Otor K Al-Khalili, Abdel A Alli, Amity F Eaton, Douglas C Eaton
A thin fluid layer in alveoli is normal and results from a balance of fluid entry and fluid uptake by transepithelial salt and water reabsorption. Conventional wisdom suggests the reabsorption is via epithelial Na(+) channels (ENaC), but if all Na(+) reabsorption was via ENaC, then amiloride, an ENaC inhibitor, should block AFC. But amiloride blocks only half of AFC. The reason for failure to block is clear from single channel measurements from alveolar epithelial cells: ENaC channels are observed, but another channel is present at the same frequency that is non-selective for Na(+) over K(+), has a larger conductance, and shorter open and closed times...
March 10, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28282356/management-of-suspected-fluid-balance-issues-in-participants-of-wilderness-endurance-events
#14
Martin D Hoffman, Jeremy Joslin, Ian R Rogers
Dehydration and exercise-associated hyponatremia (EAH) are both relatively common conditions during wilderness endurance events. Whereas dehydration is treated with fluids, EAH is appropriately managed with fluid restriction and a sodium bolus but can worsen with isotonic or hypotonic fluids. Therefore, caution is recommended in the provision of postevent rehydration in environments where EAH is a potential consideration because accurate field assessment of hydration status can be challenging, and measurement of blood sodium concentration is rarely possible in the wilderness...
March 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/28274923/effect-of-diuretics-on-renal-tubular-transport-of-calcium-and-magnesium
#15
R Todd Alexander, Henrik Dimke
Calcium (Ca2+) and Magnesium (Mg2+) reabsorption along the renal tubule is dependent on distinct trans- and paracellular pathways. Our understanding of the molecular machinery involved is increasing. Ca2+ and Mg2+ reclamation in kidney is dependent on a diverse array of proteins, which are important for both forming divalent cation permeable pores and channels, but also for generating the necessary driving forces for Ca2+ and Mg2+ transport. Alterations in these molecular constituents lead to profound effects on tubular Ca2+ and Mg2+ handling...
March 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28271619/reduced-anterior-chamber-contamination-by-frequent-surface-irrigation-with-diluted-iodine-solutions-during-cataract-surgery
#16
Hiroyuki Shimada, Shinji Arai, Hiroyuki Nakashizuka, Takayuki Hattori, Mitsuko Yuzawa
PURPOSE: To verify that ocular surface irrigation with 0.025% povidone-iodine (PI) or 0.0025% polyvinyl alcohol-iodine (PAI) during cataract surgery minimizes bacterial contamination of the anterior chamber. METHODS: The study was a prospective, interventional case series. First, the bactericidal effect of PI or PAI against Staphylococcus aureus was evaluated in vitro. Next, in 400 eyes undergoing cataract surgery, the ocular surface was irrigated every 20 seconds during surgery with balanced salt solution (BSS; 200 eyes) or BSS containing 0...
March 8, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28271233/regulation-of-glomerulotubular-balance-flow-activated-proximal-tubule-function
#17
REVIEW
Tong Wang, Sheldon Weinbaum, Alan M Weinstein
The purpose of this review is to summarize our knowledge and understanding of the physiological importance and the mechanisms underlying flow-activated proximal tubule transport. Since the earliest micropuncture studies of mammalian proximal tubule, it has been recognized that tubular flow is an important regulator of sodium, potassium, and acid-base transport in the kidney. Increased fluid flow stimulates Na(+) and HCO3(-) absorption in the proximal tubule via stimulation of Na/H-exchanger isoform 3 (NHE3) and H(+)-ATPase...
March 7, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28267999/extension-of-golay-s-plate-height-equation-from-laminar-to-turbulent-flow-i-theory
#18
Fabrice Gritti
The reduced plate height (RPH) equation of Golay derived in 1958 for open tubular columns (OTC) is extended from laminar to turbulent-like flow. The mass balance equation is solved under near-equilibrium conditions in the mobile phase for changing shapes of the velocity profile across the OTC diameter. The final expression of the general RPH equation is: [Formula: see text] where ν is the reduced linear velocity, k is the retention factor, Dm is the bulk diffusion coefficient in the mobile phase, Da¯ is the average axial dispersion coefficient, Dr¯ is the average radial dispersion coefficient, Ds is the diffusion coefficient of the analyte in the stationary film of thickness df, D is the OTC inner diameter, and n≥2 is a positive number controlling the shape of the flow profile (polynomial of degree n)...
February 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28267585/disturbances-of-thirst-and-fluid-balance-associated-with-aging
#19
REVIEW
Denovan P Begg
During heat waves, significant mortality and morbidity occurs in elderly populations due to heat-stress and dehydration. The dehydration is primarily attributable to inadequate water intake caused by dysfunction of the central nervous system mechanisms controlling thirst. The phenomenon of a reduced thirst in response to dehydration in aging was first observed decades ago and has been examined extensively since. The reduced thirst and ingestive behavior have been reported consistently in response to hyperosmotic stimuli, hypovolemic stimuli and dehydration in both elderly humans and animal models of aging...
March 3, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28259041/trunk-sway-in-idiopathic-normal-pressure-hydrocephalus-quantitative-assessment-in-clinical-practice
#20
Tomas Bäcklund, Jennifer Frankel, Hanna Israelsson, Jan Malm, Nina Sundström
BACKGROUND: In diagnosis and treatment of patients with idiopathic normal pressure hydrocephalus (iNPH), there is need for clinically applicable, quantitative assessment of balance and gait. Using a body-worn gyroscopic system, the aim of this study was to assess postural stability of iNPH patients in standing, walking and during sensory deprivation before and after cerebrospinal fluid (CSF) drainage and surgery. A comparison was performed between healthy elderly (HE) and patients with various types of hydrocephalus (ventriculomegaly (VM))...
February 24, 2017: Gait & Posture
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