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Osmolality

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https://www.readbyqxmd.com/read/28812943/tear-osmolarity-is-sensitive-to-exercise-induced-fluid-loss-but-is-not-associated-with-common-hydration-measures-in-a-field-setting
#1
Justin J Holland, Michelle Ray, Christopher Irwin, Tina L Skinner, Michael Leveritt, Ben Desbrow
This investigation (i) examined changes in tear osmolarity in response to fluid loss that occurs with exercise in a field setting, and (ii) compared tear osmolarity with common field and laboratory hydration measures.  Sixty-three participants [age 27.8 ± 8.4 years, body mass 72.15 ± 10.61 kg] completed a self-paced 10 km run outside on a predetermined course. Body mass, tear fluid, venous blood and urine samples were collected immediately before and after exercise.  Significant (p < 0.001) reductions in body mass (1...
August 16, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28811748/salivary-diagnostic-markers-in-males-and-females-during-rest-and-exercise
#2
Kay Rutherfurd-Markwick, Carlene Starck, Deborah K Dulson, Ajmol Ali
BACKGROUND: Saliva is a useful diagnostic tool for analysis in sports, exercise and nutrition research, as collection is easy and non-invasive and it contains a large number of analytes affected by a range of physiological and pathological stressors and conditions. This study examined key salivary electrolytes and stress and immune markers in males and females at rest and during exercise. METHODS: Unstimulated whole saliva from 20 healthy, recreationally active participants (8 males and 12 females) was analysed for flow rate, osmolality, sodium (Na(+)), potassium (K(+)), chloride (Cl(-)), secretory immunoglobulin A (SIgA), α-amylase activity and cortisol during both rest and moderate intensity (70% peak power) cycling exercise in a randomised crossover design...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28806208/systemic-hypotension-following-intravenous-administration-of-nonionic-contrast-medium-during-computed-tomography-iopromide-versus-iodixanol
#3
Gerlig Widmann, Reto Bale, Hanno Ulmer, Daniel Putzer, Peter Schullian, Franz-Josef Wiedermann, Wolfgang Lederer
BACKGROUND: In light of the increasing number of radiologic interventions performed under general anesthesia, the effects of contrast media (CM) on circulation and organ perfusion are of paramount importance. The objectives of this study were to systematically quantify effects on blood pressure, heart rate, and kidney function following intravenous administration of nonionic CM with normal and low osmolality. METHODS: In this controlled, double-blinded phase IV clinical trial, 40 consecutive patients were randomly assigned to receive repeated measures of either low-osmolar iopromide or iso-osmolar iodixanol...
August 10, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28803509/analytical-validation-and-reference-intervals-for-freezing-point-depression-osmometer-measurements-of-urine-osmolality-in-dogs
#4
Samantha Guerrero, Josep Pastor, Asta Tvarijonaviciute, José Joaquín Cerón, Graziano Balestra, Marco Caldin
Urine osmolality (UOsm) is considered the most accurate measure of urine concentration and is used to assess body fluid homeostasis and renal function. We performed analytical validation of freezing point depression measurement of canine UOsm, to establish reference intervals (RIs) and to determine the effect of age, sex, and reproductive status on UOsm in dogs. Clinically healthy dogs ( n = 1,991) were retrospectively selected and stratified in groups by age (young [0-12 mo], adults [13-84 mo], and seniors [>84 mo]), sex (females and males), and reproductive status (intact and neutered)...
August 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28802286/urine-color-for-assessment-of-dehydration-among-college-men-students-in-hebei-china-a-cross-sectional-study
#5
Na Zhang, Songming Du, Mengqi Zheng, Zhenchuang Tang, Ruixia Yan, Yitang Zhu, Guansheng Ma
BACKGROUND AND OBJECTIVES: To examine the association between quantified urine color and urine osmolality, and its validity in distinguishing hydration status among college men in Hebei, China. METHODS AND STUDY DESIGN: Sixty-eight college men aged 18~25 years completed a cross-sectional study. All participants were asked to complete a 24-h fluid intake record to estimate fluid intake from beverages after anthropometric measurements. The foods eaten by participants were weighed to assess fluid intake from foods...
2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28797572/hyperosmolar-metabolic-acidosis-in-burn-patients-exposed-to-glycol-based-topical-antimicrobials-a-systematic-review
#6
REVIEW
Tom Leibson, Paige Davies, Cheri Nickel, Gideon Koren
BACKGROUND: The well documented susceptibility of burn patients to acquired infections via damaged skin mandates application of antimicrobial agents. These agents are dissolved in various vehicles that augment skin absorption thus allowing greater efficacy. Polyethylene glycol (PEG) and Propylene glycol (PropG) are among the most commonly used vehicles, and both have been used in numerous medications and cosmetic products over the past few decades. Rarely, burn patients treated with agents containing these glycols present with a life threatening systemic toxidrome of hyperosmolar metabolic acidosis...
August 7, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/28790225/diagnostic-performance-of-afternoon-urine-osmolality-to-assess-optimal-hydration-status-in-an-adult-healthy-population
#7
Ni Made Hustrini, Parlindungan Siregar, Ginova Nainggolan, Kuntjoro Harimurti
BACKGROUND: optimal hydration represents adequate total daily fluid intake to compensate for daily water losses, ensure adequate urine output to reduce the risk of urolithiasis and renal function decline, and also avoid the production of arginine vasopressin (AVP). Twenty-four-hour urine osmolality has been used to assess hydration status, but it is challenging because of the possibility of spilling urine and limitation of daily activities. This study is aimed to determine the performance of the afternoon urine osmolality to assess the optimal hydration status compared with 24-hour urine osmolality...
April 2017: Acta Medica Indonesiana
https://www.readbyqxmd.com/read/28783866/hematologic-and-plasma-chemistry-ris-for-cultured-striped-catfish-pangasius-hypophthalmus-in-recirculating-aquaculture-systems
#8
Oscar A Galagarza, David D Kuhn, Stephen A Smith, Terry C Hrubec
BACKGROUND: Striped catfish (Pangasius hypophthalmus) is a valuable aquaculture fish species produced primarily in Southeast Asia. In the United States, it is bred as an ornamental species. Striped catfish has high productivity and great demand in numerous countries around the world, yet little is known about its normal physiology. OBJECTIVES: The objective of this study was to establish hematologic and blood chemistry RIs for healthy juvenile Striped catfish. METHODS: Blood samples were collected from 70 Striped catfish raised in recirculating aquaculture systems...
August 7, 2017: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/28771187/herbal-supplement-in-a-buffer-for-dry-eye-syndrome-treatment
#9
Hung-Chang Chen, Zhi-Yu Chen, Tsung-Jen Wang, Victor J Drew, Ching-Li Tseng, Hsu-Wei Fang, Feng-Huei Lin
Dry eye syndrome (DES) is one of the most common types of ocular diseases. There is a major need to treat DES in a simple yet efficient way. Artificial tears (AT) are the most commonly used agents for treating DES, but are not very effective. Herbal extractions of ferulic acid (FA), an anti-oxidant agent, and kaempferol (KM), an anti-inflammatory reagent, were added to buffer solution (BS) to replace ATs for DES treatment. The cytotoxicity and anti-inflammatory effects were examined in vitro by co-culture with human corneal epithelial cells (HCECs) to obtain the optimal concentration of KM and FA for treating HCECs...
August 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28771063/reliability-of-urinary-dehydration-markers-among-elite-youth-boxers
#10
Damir Zubac, Drazen Cular, Uros Marusic
PURPOSE: The aim of the present study was to determine the reliability and diagnostic accuracy of non-invasive urinary dehydration markers, in field-based settings on a day-to-day basis in elite adolescent amateur boxers. METHODS: Sixty-nine urine samples were collected on a day-to-day basis, from twenty-three athletes (17.3±1.9 y), during their weigh-stable phase and analyzed by field and laboratory measures of hydration status. Urine osmolality (UOSM), urine specific gravity (USG), total protein content (TPC) and body-mass (BM) stability were evaluated to determine fluid balance and hydration status...
August 3, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28766715/hypertonic-nacl-versus-osmotic-stimuli-distinct-ovlt-neurones-can-sense-the-difference-to-control-sympathetic-outflow-and-blood-pressure
#11
V R Antunes
Despite large fluctuations in salt and water intake, mammals are able to maintain electrolyte concentrations, particularly sodium (Na(+) ) as the major determinant of osmolality of the extracellular fluid (ECF), within narrow physiological limits (∼300 mOsm kg(-1) ). This article is protected by copyright. All rights reserved.
August 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28764991/transcriptional-translational-and-systemic-alterations-during-the-time-course-of-osmoregulatory-acclimation-in-two-palaemonid-shrimps-from-distinct-osmotic-niches
#12
Rogério Oliveira Faleiros, Rosa P M Furriel, John Campbell McNamara
Palaemonid shrimps exhibit numerous adaptive strategies, both in their life cycles and in biochemical, physiological, morphological and behavioral characteristics that reflect the wide variety of habitats in which they occur, including species that are of particular interest when analyzing adaptive osmoregulatory strategies. The present investigation evaluates the short- (hours) and long-term (days) time courses of responses of two palaemonid shrimps from separate yet overlapping osmotic niches, Palaemon northropi (marine) and Macrobrachium acanthurus (diadromous, fresh water), to differential salinity challenges at distinct levels of structural organization: (i) transcriptional, analyzing quantitative expression of gill mRNAs that encode for subunits of the Na(+)/K(+)-ATPase and V(H(+))-ATPase ion transporters; (ii) translational, examining the kinetic behavior of gill Na(+)/K(+)-ATPase specific activity; and (iii) systemic, accompanying consequent adjustment of hemolymph osmolality...
July 29, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28752324/effect-of-glucose-on-3d-cardiac-microtissues-derived-from%C3%A2-human-induced-pluripotent-stem-cells
#13
Michael Balistreri, Justin A Davis, Katherine F Campbell, André Monteiro Da Rocha, Marjorie C Treadwell, Todd J Herron
Maternal hyperglycemia is a risk factor for fetal cardiac anomalies. This study aimed to assess the effect of high glucose on human induced pluripotent stem cell-derived cardiomyocyte self-assembly into 3D microtissues and their calcium handling. Stem cells were differentiated to beating cardiomyocytes using established protocols. On the final day of the differentiation process, cells were treated with control media, 12 mM glucose, or 12 mM mannitol (an osmolality control). Once beating, the cardiac cells were dissociated with trypsin, collected, mixed with collagen, and plated into custom-made silicone micro molds in order to generate 3D cardiac microtissues...
July 27, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28752295/nmr-based-metabolomics-reveals-the-metabolite-profiles-of-vibrio-parahaemolyticus-under-ferric-iron-stimulation
#14
Jun Zhou, Chenyang Lu, Dijun Zhang, Chennv Ma, Xiurong Su
Vibrio parahaemolyticus is a halophilic bacterium endemic to coastal areas, and its pathogenicity has caused widespread seafood poisoning. In our previous research, the protein expression of V. parahaemolyticus in Fe(3+) medium was determined using isobaric tags for relative and absolute quantitation (iTRAQ). Here, nuclear magnetic resonance (NMR) was used to detect changes in the V. parahaemolyticus metabolome. NMR spectra were obtained using methanol-water extracts of intracellular metabolites from V. parahaemolyticus under various culture conditions, and 62 metabolites were identified, including serine, arginine, alanine, ornithine, tryptophan, glutamine, malate, NAD(+), NADP(+), oxypurinol, xanthosine, dCTP, uracil, thymine, hypoxanthine, and betaine...
August 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28748582/extravasal-albumin-concentration-modulates-contractile-responses-of-renal-afferent-arterioles
#15
Xiang Gao, Zhi Zhao Liu, Hayar Mohammed, Zhengbing Zhuge, Ming Liu, En Yin Lai, Leif Jansson, Mattias Carlström, Andreas Patzak, A Erik G Persson
AIM: Afferent arterioles (AA) hold a key position in the regulation of renal blood flow and glomerular filtration rate. Being the effector site of tubuloglomerular feedback the afferent arteriole contributes to the renal handling of sodium and fluid. Dehydration goes along with increased renal interstitial protein concentration. Here, the hypothesis was tested that extravasal protein concentration directly modulates afferent arteriolar tone; a mechanism which may contribute to body fluid volume control...
July 27, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28747468/sympathetic-neural-and-hemodynamic-responses-to-head-up-tilt-during-iso-osmotic-and-hyper-osmotic-hypovolemia
#16
Alexander M Posch, Adam J Luippold, Katherine M Mitchell, Karleigh E Bradbury, Robert W Kenefick, Samuel N Cheuvront, Nisha Charkoudian
We hypothesized that muscle sympathetic nerve activity (MSNA) during head-up tilt (HUT) would be augmented during exercise-induced (hyperosmotic) dehydration but not iso-osmotic dehydration via oral diuretic. We studied 26 young healthy subjects (7 F, 19 M) divided into 3 groups: euhydrated (EUH, n = 7), previously exercised in 40°C while maintaining hydration; dehydrated (DEH, n = 10), previously exercised in 40 °C who lost ~3% of body weight via sweat loss; and diuretic (DIUR, n = 9), who did not exercise and lost ~3% of bodyweight via diuresis (furosemide, 80 mg po)...
July 26, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28746899/hypertonic-saline-in-critical-illness-a-systematic-review
#17
REVIEW
Carmen Andrea Pfortmueller, Joerg C Schefold
INTRODUCTION: The optimal approach to fluid management in critically ill patients is highly debated. Fluid resuscitation using hypertonic saline was used in the past for more than thirty years, but has recently disappeared from clinical practice. Here we provide an overview on the currently available literature on effects of hypertonic saline infusion for fluid resuscitation in the critically ill. METHODS: Systematic analysis of reports of clinical trials comparing effects of hypertonic saline as resuscitation fluid to other available crystalloid solutions...
June 19, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28745940/intravenous-corticosteroid-premedication-administered-5-hours-before-ct-compared-with-a-traditional-13-hour-oral-regimen
#18
Benjamin M Mervak, Richard H Cohan, James H Ellis, Shokoufeh Khalatbari, Matthew S Davenport
Purpose To determine if the allergic-like breakthrough reaction rate of intravenous corticosteroid prophylaxis administered 5 hours before contrast material-enhanced computed tomography (CT) is noninferior to that of a traditional 13-hour oral regimen. Materials and Methods Institutional review board approval was obtained and informed consent waived for this retrospective noninferiority cohort study. Subjects (n = 202) who completed an accelerated 5-hour intravenous corticosteroid premedication regimen before low-osmolality contrast-enhanced CT for a prior allergic-like or unknown-type reaction to iodine-based contrast material from June 1, 2008, to June 30, 2016, were identified...
July 26, 2017: Radiology
https://www.readbyqxmd.com/read/28744880/chemical-composition-and-diuretic-natriuretic-and-kaliuretic-effects-of-extracts-of-mimosa-bimucronata-dc-kuntze-leaves-and-its-majority-constituent-methyl-gallate-in-rats
#19
Fabile Schlickmann, Priscila de Souza, Thaise Boeing, Luisa N B Mariano, Viviane M B Steimbach, Clarissa de M A Krueger, Luísa M da Silva, Sérgio F de Andrade, Valdir Cechinel-Filho
OBJECTIVES: Some species of the genus Mimosa showed promising results in previous investigations, which include diuretic effect; however, no chemical analyses or animal model has been conducted so far to evaluate the biological properties of M. bimucronata. METHODS: Male Wistar rats received the oral treatment with vehicle; hydrochlorothiazide; methanolic extract from M. bimucronata (MEMB), dichloromethane (DCM) and ethyl acetate (EA) fractions or methyl gallate (MG)...
July 26, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28739050/reduced-water-intake-deteriorates-glucose-regulation-in-patients-with-type-2-diabetes
#20
Evan C Johnson, Costas N Bardis, Lisa T Jansen, J D Adams, Tracie W Kirkland, Stavros A Kavouras
Epidemiological research has demonstrated that low daily total water intake is associated with increased diagnosis of hyperglycemia. Possible mechanisms for this increase include hormones related to the hypothalamic pituitary axis as well as the renin-angiotensin-aldosterone system (RAAS). Therefore, the hypothesis of the present study was that acute low water intake would result in differential hormonal profiles and thus impaired blood glucose regulation during an oral glucose tolerance test (OGTT) in people with type 2 diabetes mellitus (T2DM)...
July 2017: Nutrition Research
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