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Fluid and water balance

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https://www.readbyqxmd.com/read/28414302/increased-salt-consumption-induces-body-water-conservation-and-decreases-fluid-intake
#1
Natalia Rakova, Kento Kitada, Kathrin Lerchl, Anke Dahlmann, Anna Birukov, Steffen Daub, Christoph Kopp, Tetyana Pedchenko, Yahua Zhang, Luis Beck, Bernd Johannes, Adriana Marton, Dominik N Müller, Manfred Rauh, Friedrich C Luft, Jens Titze
BACKGROUND: The idea that increasing salt intake increases drinking and urine volume is widely accepted. We tested the hypothesis that an increase in salt intake of 6 g/d would change fluid balance in men living under ultra-long-term controlled conditions. METHODS: Over the course of 2 separate space flight simulation studies of 105 and 205 days' duration, we exposed 10 healthy men to 3 salt intake levels (12, 9, or 6 g/d). All other nutrients were maintained constant...
April 17, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28411128/the-effects-of-experimental-gestational-hypertension-on-maternal-blood-pressure-and-fluid-intake-and-pre-weanling-hypothalamic-neuronal-activity
#2
Juan Arguelles, Carmen Perillan, Terry G Beltz, Baojian Xue, Daniel Badaue-Passos, Jose A Vega, Alan Kim Johnson
To examine the fetal programming effects of maternal hypertension, natriophilia and hyperreninemia [experimentally induced in rats by partial inter-renal aortic ligature (PAL) prior to mating] fos immunoreactivity was studied in 6-day-old offspring of PAL and control mothers. The purposes of the present set of experiments were twofold. The first was to characterize the effects of PAL on the mother's arterial blood pressure and intake of salt (1.8% NaCl solution) and water over the course of gestation. Second, was to study the pattern of neuronal activation in key brain areas of 6-day-old offspring treated with the dipsogen isoproterenol that were from PAL and control mothers...
April 11, 2017: Appetite
https://www.readbyqxmd.com/read/28406441/beverage-consumption-habits-among-the-european-population-association-with-total-water-and-energy-intakes
#3
Mariela Nissensohn, Almudena Sánchez-Villegas, Pilar Galan, Aida Turrini, Nathalie Arnault, Lorenza Mistura, Adriana Ortiz-Andrellucchi, Fabien Szabo de Edelenyi, Laura D'Addezio, Lluis Serra-Majem
BACKGROUND: Fluid and water intake have received limited attention in epidemiological studies. The aim of this study was to compare the average daily consumption of foods and beverages in adults of selective samples of the European Union (EU) population in order to understand the contribution of these to the total water intake (TWI), evaluate if the EU adult population consumes adequate amounts of total water (TW) according to the current guidelines, and to illustrate the real water intake in Europe...
April 13, 2017: Nutrients
https://www.readbyqxmd.com/read/28395164/interaction-of-poly-lactic-co-glycolic-acid-nanoparticles-at-fluid-interfaces
#4
Gergő Gyulai, Éva Kiss
HYPOTHESIS: Adsorption and localization of nanoparticles at fluid interfaces are key factors in processes like transport through membranes or emulsion stabilization. Adsorption of poly(lactic-co-glycolic acid) (PLGA) and Pluronic coated PLGA nanoparticles (NPs) were studied at three different fluid interfaces. The effect of particle surface modification and type of interface was investigated with the aim of fine tuning interfacial interaction of the nanoparticles. EXPERIMENTS: Surface tension measurements were carried out to determine the surface activity and adsorption kinetics of the particles...
March 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28384420/not-good-but-not-all-bad-dehydration-effects-on-body-fluids-organ-masses-and-water-flux-through-the-skin-of-rhinella-schneideri-amphibia-bufonidae
#5
Rodolfo C O Anderson, Rafael P Bovo, Carlos E Eismann, Amauri A Menegario, Denis V Andrade
Because of their permeable skin, terrestrial amphibians are constantly challenged by the potential risk of dehydration. However, some of the physiological consequences associated with dehydration may affect aspects that are themselves relevant to the regulation of water balance. Accordingly, we examined the effects of graded levels of dehydration on the rates of evaporative water loss and water absorption through the skin in the terrestrial Neotropical toad, Rhinella schneideri. Concomitantly, we monitored the effects of dehydration on the mass of visceral organs; hematocrit and hemoglobin content; plasma osmolality; and plasma concentration of urea, sodium, chloride, and potassium...
May 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28377431/the-renal-and-cardiovascular-effects-of-natriuretic-peptides
#6
Philip Ching Yat Wong, Jun Guo, Aidong Zhang
The landmark report by de Bold et al. in 1981 signified the heart as one of the endocrine organs involved in fluid and salt balance (de Bold AJ, Borenstein HB, Veress AT, Sonnenberg H. Life Sci 28: 89-94, 1981). Atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) are secreted from cardiomyocytes in response to cardiac stretch as in the case of heart failure, whereas C-type natriuretic peptide (CNP) is secreted from endothelial and renal cells in response to cytokines and endothelium-dependent agonists, such as acetylcholine...
June 1, 2017: Advances in Physiology Education
https://www.readbyqxmd.com/read/28371470/role-of-renal-vascular-potassium-channels-in-physiology-and-pathophysiology
#7
REVIEW
Max Salomonsson, Jens Christian Brasen, Charlotte M Sorensen
The control of renal vascular tone is important for the regulation of salt and water balance, blood pressure and the protection against damaging elevated glomerular pressure. The K(+) conductance is a major factor in the regulation of the membrane potential (Vm ) in vascular smooth muscle (VSMC) and endothelial cells (EC). The vascular tone is controlled by Vm via its effect on the opening probability of voltage operated Ca(2+) channels (VOCC) in VSMC. When K(+) conductance increases Vm becomes more negative and vasodilation follows, while deactivation of K(+) channels leads to depolarization and vasoconstriction...
March 30, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28338158/-diagnosis-and-treatment-of-duodenal-injury-and-fistula
#8
Kunmei Gong, Shikui Guo, Kunhua Wang
Duodenal injury is a serious abdominal organ injury. Duodenal fistula is one of the most serious complications in gastrointestinal surgery, which is concerned for its critical status, difficulty in treatment and high mortality. Thoracic and abdominal compound closed injury and a small part of open injury are common causes of duodenal injury. Iatrogenic or traumatic injury, malnutrition, cancer, tuberculosis, Crohn's disease etc. are common causes of duodenal fistula, however, there has been still lacking of ideal diagnosis and treatment by now...
March 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28336818/increased-exposure-to-sodium-during-pregnancy-and-lactation-changes-basal-and-induced-behavioral-and-neuroendocrine-responses-in-adult-male-offspring
#9
Marcia S Silva, Fabiana Lúcio-Oliveira, Andre Souza Mecawi, Lucas F Almeida, Silvia G Ruginsk, Michael P Greenwood, Mingkwan Greenwood, Laura Vivas, Lucila L K Elias, David Murphy, José Antunes-Rodrigues
Excessive sodium (Na(+)) intake in modern society has been associated with several chronic disorders such as hypertension. Several studies suggest that early life events can program physiological systems and lead to functional changes in adulthood. Therefore, we investigated behavioral and neuroendocrine responses under basal conditions and after 48 h of water deprivation in adult (60-day-old Wistar rats) male, Wistar rats originating from dams were offered only water or 0.15 mol/L NaCl during pregnancy and lactation...
March 2017: Physiological Reports
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
#10
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/28283476/alveolar-non-selective-channels-are-asic1a-%C3%AE-enac-channels-and-contribute-to-afc
#11
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/28267585/disturbances-of-thirst-and-fluid-balance-associated-with-aging
#12
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/28258569/aquaporins-in-respiratory-system
#13
Yuanlin Song, Linlin Wang, Jian Wang, Chunxue Bai
Aquaporins (AQPs ) are water channel proteins supposed to facilitating fluid transport in alveolar space, airway humidification, pleural fluid absorption, and submucosal gland secretion . In this chapter, we mainly focus on the expression of 4 AQPs in the lungs which include AQP1, AQP2 , AQP4 and AQP5 in normal and disease status, and the experience of AQPs function from various model and transgenic mice were summarized in detail to improve our understanding of the role of AQPs in fluid balance of respiratory system...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28253022/a-sodium-drink-enhances-fluid-retention-during-3-hours-of-post-exercise-recovery-when-ingested-with-a-standard-meal
#14
Gethin H Evans, Jennifer Miller, Sophie Whiteley, Lewis J James
The purpose of this study was to examine the efficacy of water and a 50 mmol/L NaCl solution on post-exercise rehydration when a standard meal was consumed during rehydration. Eight healthy participants took part in two experimental trials during which they lost 1.5 ± 0.4 % of initial body mass via intermittent exercise in the heat. Participants then rehydrated over a 60 minute period with water or a 50 mmol/L NaCl solution in a volume equivalent to 150% of their body mass loss during exercise. In addition, a standard meal was ingested during this time which was equivalent to 30% of participants predicted daily energy expenditure...
March 2, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28221829/the-evolutionary-economics-of-embryonic-sac-fluids-in-squamate-reptiles
#15
Xavier Bonnet, Guy Naulleau, Richard Shine
The parchment-shelled eggs of squamate reptiles take up substantial water from the nest environment, enabling the conversion of yolk into neonatal tissue and buffering the embryo against the possibility of subsequent dry weather. During development, increasing amounts of water are stored in the embryonic sacs (i.e., membranes around the embryo: amnion, allantois, and chorion). The evolution of viviparity (prolonged uterine retention of developing embryos) means that embryonic-sac fluid storage now imposes a cost (increased maternal burdening), confers less benefit (because the mother buffers fetal water balance), and introduces a potential conflict among uterine siblings (for access to finite water supplies)...
March 2017: American Naturalist
https://www.readbyqxmd.com/read/28196670/fluid-balance-and-chloride-load-in-the-first-24h-of-icu-admission-and-its-relation-with-renal-replacement-therapies-through-a-multicentre-retrospective-case-control-study-paired-by-apache-ii
#16
A González-Castro, M Ortiz-Lasa, O Leizaola, E Salgado, T Irriguible, M Sánchez-Satorra, C Lomas-Fernández, P Barral-Segade, M Cordero-Vallejo, E Rodrigo-Calabia, T Dierssen-Sotos
OBJECTIVE: To analyse the association between water balance during the first 24h of admission to ICU and the variables related to chloride levels (chloride loading, type of fluid administered, hyperchloraemia), with the development of acute kidney injury renal replacement therapy (AKI-RRT) during patients' admission to ICU. PATIENTS AND METHODS: Multicentre case-control study. Hospital-based, national, carried out in 6 ICUs. Cases were patients older than 18 years who developed an AKI-RRT...
May 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/28174217/diagnosis-and-treatment-of-hyponatremia-compilation-of-the-guidelines
#17
Ewout J Hoorn, Robert Zietse
Hyponatremia is a common water balance disorder that often poses a diagnostic or therapeutic challenge. Therefore, guidelines were developed by professional organizations, one from within the United States (2013) and one from within Europe (2014). This review discusses the diagnosis and treatment of hyponatremia, comparing the two guidelines and highlighting recent developments. Diagnostically, the initial step is to differentiate hypotonic from nonhypotonic hyponatremia. Hypotonic hyponatremia is further differentiated on the basis of urine osmolality, urine sodium level, and volume status...
February 7, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28153467/water-balance-in-the-fetus-and-neonate
#18
REVIEW
Julie B Lindower
Fetal water balance is dependent prenatally on the placental transfer of water from maternal to fetal circulation. Adequate amniotic fluid volume is one indicator of stable fetal status and development. Excessive or less than expected amniotic fluid volume may be a precursor to postnatal morbidity and mortality. Postnatal transition is marked by predictable changes in body water including contraction of extracellular volume and insensible fluid loss, primarily across the skin barrier. The degree to which these occur is determined by gestational and postnatal age...
January 30, 2017: Seminars in Fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28142108/homeopathic-medicine-cantharis-modulates-uropathogenic-e-coli-upec-induced-cystitis-in-susceptible-mice
#19
Cidéli de Paula Coelho, Priscilla Dias Motta, Mariana Petrillo, Renata de Oliveira Iovine, Luciane Costa Dalboni, Fabiana Rodrigues Santana, Michelle Sanchez Freitas Correia, Renato Corrêa Viana Casarin, Vania Maria Carvalho, Leoni Villano Bonamin
OBJECTIVE: This is a random blinded placebo controlled murine experimental model to study the effects of Cantharis 6 CH, a homeopathic medicine, on E coli-induced cystitis. METHODS: 24 adult susceptible female BALB/c mice were inoculated with E coli - UPEC O4:K-:H5 by a transurethral catheter. Cantharis 6cH or vehicle (placebo) was offered to mice by free access into the drinking water (1:100), during 24 h after infection. Spleen, bladder and kidneys were processed for quantitative histopathology after immunohistochemistry, using anti-CD3, CD79, MIF, NK and VEGF antibodies; the cytokines present in the bladder washing fluid were measured using a LUMINEX-Magpix KIT...
January 28, 2017: Cytokine
https://www.readbyqxmd.com/read/28135107/free-energy-of-scission-for-sodium-laureth-1-sulfate-wormlike-micelles
#20
Karsten Vogtt, Hanqiu Jiang, Gregory Beaucage, Michael Weaver
Wormlike micelles (WLMs) are nanoscale, self-assembled components of many products from shampoos to fracking fluids due to their viscoelasticity. Their rheological behavior is largely governed by the contour length of the micelles and the concomitant propensity of the micelles to overlap and entangle. The large contour lengths, on the order of micrometers, is the result of a delicate balance between the scission enthalpy of the wormlike micelles on the one hand and entropic factors such as the mixing entropy of dispersion, the ordering of water molecules and counterions, and the mobility of branch points on the other hand...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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