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Fluid balance physiology

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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
#1
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/28330845/transport-across-the-choroid-plexus-epithelium
#2
Jeppe Praetorius, Helle Hasager Damkier
The choroid plexus epithelium is a secretory epithelium par excellence. However, this is perhaps not the most prominent reason for the massive interest in this modest-sized tissue residing inside the brain ventricles. Most likely, the dominant reason for extensive studies of the choroid plexus is the identification of this epithelium as the source of the majority of intraventricular cerebrospinal fluid. This finding has direct relevance for studies of diseases and conditions with deranged central fluid volume or ionic balance...
March 22, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28320893/regional-differences-in-nutrient-induced-secretion-of-gut-serotonin
#3
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/28271233/regulation-of-glomerulotubular-balance-flow-activated-proximal-tubule-function
#4
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/28267585/disturbances-of-thirst-and-fluid-balance-associated-with-aging
#5
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
#6
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/28252537/daily-lowest-hemoglobin-and-risk-of-organ-dysfunctions-in-critically-ill-patients
#7
Sarah J Hemauer, Adam J Kingeter, Xue Han, Matthew S Shotwell, Pratik P Pandharipande, Liza M Weavind
OBJECTIVES: To determine the association between hemoglobin levels and the daily risk of individual organ dysfunctions in critically ill patients. DESIGN: Post hoc analysis of prospectively collected data. SETTING: Vanderbilt University Medical Center and Saint Thomas Hospital Medical and Surgical ICUs. PATIENTS: Medical and surgical ICU patients admitted with respiratory failure or shock. INTERVENTIONS: Baseline demographic data, and detailed in-ICU and hospital data, including daily lowest hemoglobin, were collected up to hospital day 30...
March 1, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28240700/factors-influencing-weaning-older-adults-from-mechanical-ventilation-an-integrative-review
#8
Karen V Stieff, Fidelindo Lim, Leon Chen
This study aim was to describe the influences that affect weaning from mechanical ventilation among older adults in the intensive care unit (ICU). Adults older than 65 years comprised only 14.5% of the US population in 2014; however, they accounted up to 45% of all ICU admissions. As this population grows, the number of ICU admissions is expected to increase. One of the most common procedures for hospitalized adults 75 years and older is mechanical ventilation. An integrative review methodology was applied to analyze and synthesize primary research reports...
April 2017: Critical Care Nursing Quarterly
https://www.readbyqxmd.com/read/28142133/perioperative-hemodynamic-instability-and-fluid-overload-are-associated-with-increasing-acute-kidney-injury-severity-and-worse-outcome-after-cardiac-surgery
#9
Anja Haase-Fielitz, Michael Haase, Rinaldo Bellomo, Paolo Calzavacca, Anke Spura, Hassina Baraki, Ingo Kutschka, Christian Albert
PURPOSE: The study aimed to investigate patients' characteristics, fluid and hemodynamic management, and outcomes according to the severity of cardiac surgery-associated acute kidney injury (CSA-AKI). METHODS: In a single-center, prospective cohort study, we enrolled 282 adult cardiac surgical patients. In a secondary analysis, we assessed preoperative patients' characteristics, physiological variables, and medication for intra- and postoperative fluid and hemodynamic management and outcomes according to CSA-AKI stages by the Renal risk, Injury, Failure, Loss, End-stage renal disease (RIFLE) classification...
January 31, 2017: Blood Purification
https://www.readbyqxmd.com/read/28131530/cystatin-c-guided-vancomycin-dosing-in-critically-ill-patients-a%C3%A2-quality-improvement-project
#10
Erin Frazee, Andrew D Rule, John C Lieske, Kianoush B Kashani, Jason N Barreto, Abinash Virk, Philip J Kuper, Ross A Dierkhising, Nelson Leung
BACKGROUND: The aim of the study was to determine whether a vancomycin dosing algorithm based on estimated glomerular filtration rate from creatinine and cystatin C levels (eGFRcr-cys) improves target trough concentration achievement compared to an algorithm based on estimated creatinine clearance (eCLcr) in critically ill patients. STUDY DESIGN: This prospective quality improvement project evaluated intensive care unit (ICU) patients started on intravenous vancomycin using one of 2 different strategies...
January 25, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28118414/copeptin-predicts-mortality-in-critically-ill-patients
#11
Konstantin A Krychtiuk, Maria C Honeder, Max Lenz, Gerald Maurer, Johann Wojta, Gottfried Heinz, Kurt Huber, Walter S Speidl
BACKGROUND: Critically ill patients admitted to a medical intensive care unit exhibit a high mortality rate irrespective of the cause of admission. Besides its role in fluid and electrolyte balance, vasopressin has been described as a stress hormone. Copeptin, the C-terminal portion of provasopressin mirrors vasopressin levels and has been described as a reliable biomarker for the individual's stress level and was associated with outcome in various disease entities. The aim of this study was to analyze whether circulating levels of copeptin at ICU admission are associated with 30-day mortality...
2017: PloS One
https://www.readbyqxmd.com/read/28117000/vasopressin-and-related-peptides-potential-value-in-diagnosis-prognosis-and-treatment-of-clinical-disorders
#12
Ewa Szczepanska-Sadowska, Tymoteusz Zera, Piotr Sosnowski, Agnieszka Cudnoch-Jedrzejewska, Anna Puszko, Aleksandra Misicka
Vasopressin (AVP) and its receptors play a pivotal role in maintaining body homeostasis under physiological and pathophysiological conditions. As a consequence, the vasopressin system has emerged as an important target for both diagnostic and therapeutic applications in a number of medical conditions. Stoichiometric generation of AVP with copeptin, which is relatively accessible in the blood for measurements, makes copeptin a valuable surrogate of AVP. In this review, we present the regulation of release of AVP and activation of V1a, V1b, and V2 vasopressin receptors under physiological and pathological conditions...
January 19, 2017: Current Drug Metabolism
https://www.readbyqxmd.com/read/28116714/dopaminergic-immunofluorescence-studies-in-kidney-tissue
#13
J J Gildea, R E Van Sciver, H E McGrath, B A Kemp, P A Jose, R M Carey, R A Felder
The kidney is a highly integrated system of specialized differentiated cells that are responsible for fluid and electrolyte balance in the body. While much of today's research focuses on isolated nephron segments or cells from nephron segments grown in tissue culture, an often overlooked technique that can provide a unique view of many cell types in the kidney is slice culture. Here, we describe techniques that use freshly excised kidney tissue from rats to perform a variety of experiments shortly after isolating the tissue...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28105603/resuscitation-fluid-composition-affects-hepatic-inflammation-in-a-murine-model-of-early-sepsis
#14
Amanda L Patrick, Peter M Grin, Nicole Kraus, Michelle Gold, Matthew Berardocco, Patricia C Liaw, Alison E Fox-Robichaud
BACKGROUND: Fluid resuscitation is a crucial therapy for sepsis, and the use of balanced fluids and/or isotonic albumin may improve patient survival. We have previously demonstrated that resuscitation with normal saline results in increased hepatic leukocyte recruitment in a murine model of sepsis. Given that clinical formulations of albumin are in saline, our objectives were to develop a novel balanced electrolyte solution specifically for sepsis and to determine if supplementing this solution with albumin would improve the inflammatory response in sepsis...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28100478/adropin-acts-in-the-rat-paraventricular-nucleus-to-influence-neuronal-excitability
#15
Spencer P Loewen, Alastair V Ferguson
Adropin is a peptide hormone with cardiovascular and metabolic roles in the periphery, including effects on glucose and lipid homeostasis. Central administration of adropin has been shown to inhibit water intake in rats, however, the site at which central adropin acts has yet to be elucidated. The hypothalamic paraventricular nucleus (PVN), a critical autonomic control center, plays essential roles in the control of fluid balance, energy homeostasis and cardiovascular regulation, and is therefore a potential target for centrally acting adropin...
January 18, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28087126/cardiac-lymphatics-a-new-avenue-for-therapeutics
#16
REVIEW
Taina Vuorio, Annakaisa Tirronen, Seppo Ylä-Herttuala
Recent progress in lymphatic vessel biology and in novel imaging techniques has established the importance of the lymphatic vasculature as part of the cardiovascular system. The lymphatic vessel network regulates many physiological processes important for heart function such as fluid balance, transport of extravasated proteins, and trafficking of immune cells. Therefore, lymphangiogenic therapy could be beneficial in the treatment of cardiovascular diseases, for example by improving reverse cholesterol transport (RCT) from atherosclerotic lesions or by resolving edema and fibrosis after myocardial infarction...
January 10, 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/28051332/activation-of-the-central-melanocortin-system-chronically-reduces-body-mass-without-the-necessity-of-long-term-caloric-restriction
#17
I Côté, Y Sakarya, N Kirichenko, D Morgan, C S Carter, N Tümer, P J Scarpace
Melanotan II (MTII) is a potent appetite suppressor that rapidly reduces body mass. Given the rapid loss of anorexic response upon chronic MTII treatment, most investigations have focused on the initial physiological adaptations. However, other evidence supports MTII as a long-term modulator of energy balance that remains to be established. Therefore, we examined the chronic effects of MTII on energy homeostasis. MTII (high or low dose) or artificial cerebrospinal fluid (aCSF) was infused into the lateral ventricle of the brain of 6-month-old F344BN rats (6-7/group) over 40 days...
October 19, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28039439/hypothalamic-s1p-s1pr1-axis-controls-energy-homeostasis-in-middle-aged-rodents-the-reversal-effects-of-physical-exercise
#18
Vagner Ramon Rodrigues Silva, Carlos Kiyoshi Katashima, Carla G Bueno Silva, Luciene Lenhare, Thayana Oliveira Micheletti, Rafael Ludemann Camargo, Ana Carolina Ghezzi, Juliana Alves Camargo, Alexandre Moura Assis, Natalia Tobar, Joseane Morari, Daniela S Razolli, Leandro Pereira Moura, José Rodrigo Pauli, Dennys Esper Cintra, Lício Augusto Velloso, Mario J A Saad, Eduardo Rochete Ropelle
Recently, we demonstrated that the hypothalamic S1PR1/STAT3 axis plays a critical role in the control of food consumption and energy expenditure in rodents. Here, we found that reduction of hypothalamic S1PR1 expression occurs in an age-dependent manner, and was associated with defective thermogenic signaling and weight gain. To address the physiological relevance of these findings, we investigated the effects of chronic and acute exercise on the hypothalamic S1PR1/STAT3 axis. Chronic exercise increased S1PR1 expression and STAT3 phosphorylation in the hypothalamus, restoring the anorexigenic and thermogenic signals in middle-aged mice...
December 26, 2016: Aging
https://www.readbyqxmd.com/read/28017410/disorders-of-sodium-and-water-homeostasis
#19
REVIEW
Julien Guillaumin, Stephen P DiBartola
This review article discusses normal and abnormal sodium balance in small animals. The terms and concepts central to understanding normal sodium and water balance are presented as well as of the physiology of body fluid compartments and the movement of fluid between those compartments. As dysnatremia is a very common disorder across the spectrum of critically ill patients, the main focus of the article is to present several clinical examples of both acute and chronic hypernatremia and hyponatremia and their practical, clinical management...
March 2017: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/27995008/desflurane-inhalation-before-ischemia-increases-ischemia-reperfusion-induced-vascular-leakage-in-isolated-rabbit-lungs
#20
Yoshiaki Oshima, Seiji Sakamoto, Kazumasa Yamasaki, Shinsuke Mochida, Kazumi Funaki, Naoki Moriyama, Akihiro Otsuki, Ryo Endo, Masato Nakasone, Shunsaku Takahashi, Tomomi Harada, Yukari Minami, Yoshimi Inagaki
BACKGROUND: Isoflurane and sevoflurane protect lungs with ischemia-reperfusion (IR) injury. We examined the influence of desflurane on IR lung injury using isolated rabbit lungs perfused with a physiological salt solution. METHODS: The isolated lungs were divided into three groups: IR, desflurane-treated ischemia-reperfusion (DES-IR), and ventilation/perfusion-continued control (Cont) groups (n = 6 per group). In the DES-IR group, inhalation of desflurane at 1 minimum alveolar concentration (MAC) was conducted in a stable 30-min phase...
2016: SpringerPlus
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