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https://www.readbyqxmd.com/read/28535530/mathematical-model-of-potassium-profiling-in-chronic-dialysis
#1
Mauro Ursino, Gabriele Donati
Potassium balance is a difficult task in hemodialysis: low potassium in the dialysate is associated with a high risk of sudden cardiac death, whereas excessive dialysate potassium may provoke insufficient removal and hyperkalemia. A better understanding of the problem can be achieved with the use of mathematical models of solute kinetics. This study is aimed at presenting an improved model of solute kinetics and fluid shifts during hemodialysis. It comprises a 2-compartment (intracellular and extracellular) description of sodium, potassium, and urea, including volume fluid shifts induced by osmotic forces...
2017: Contributions to Nephrology
https://www.readbyqxmd.com/read/28532509/barriers-and-facilitators-to-healthcare-professional-behaviour-change-in-clinical-trials-using-the-theoretical-domains-framework-a-case-study-of-a-trial-of-individualized-temperature-reduced-haemodialysis
#2
Justin Presseau, Brittany Mutsaers, Ahmed A Al-Jaishi, Janet Squires, Christopher W McIntyre, Amit X Garg, Manish M Sood, Jeremy M Grimshaw
BACKGROUND: Implementing the treatment arm of a clinical trial often requires changes to healthcare practices. Barriers to such changes may undermine the delivery of the treatment making it more likely that the trial will demonstrate no treatment effect. The 'Major outcomes with personalized dialysate temperature' (MyTEMP) is a cluster-randomised trial to be conducted in 84 haemodialysis centres across Ontario, Canada to investigate whether there is a difference in major outcomes with an individualized dialysis temperature (IDT) of 0...
May 22, 2017: Trials
https://www.readbyqxmd.com/read/28532146/calcium-iron-and-zinc-bioaccessibilities-of-australian-sweet-lupin-lupinus-angustifolius-l-cultivars
#3
Weeraya Karnpanit, Ranil Coorey, Jon Clements, Wenika Benjapong, Vijay Jayasena
The study aimed to determine the effect of cultivar and dehulling on calcium, iron and zinc bioaccessibilities of Australian sweet lupin (ASL). Ten ASL cultivars grown in 2011, 2012 and 2013 in Western Australia were used for the study. The bioaccessibilities of calcium, iron and zinc in whole seed and dehulled lupin samples were determined using a dialysability method. Cultivar had significant effects on calcium, iron and zinc contents and their bioaccessibilities. The average bioaccessibilities of 6% for calcium, 17% for iron and 9 % for zinc were found for whole seeds...
May 22, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28531904/routine-monitoring-of-sodium-and-phosphorus-removal-in-peritoneal-dialysis-pd-patients-treated-with-continuous-ambulatory-pd-capd-automated-pd-apd-or-combined-capd-apd
#4
Veronika Moor, Robert Wagner, Michael Sayer, Marlies Petsch, Sandra Rueb, Hans-Ulrich Häring, Nils Heyne, Ferruh Artunc
BACKGROUND: Adequate removal of sodium (Na) and phosphorus (P) is of paramount importance for patients with dialysis-dependent kidney disease can easily quantified in peritoneal dialysis (PD) patients. Some studies suggest that automated PD (APD) results in lower Na and P removal. METHODS: In this study we retrospectively analysed our data on Na and P removal in PD patients after implementation of a routine monitoring in 2011. Patients were stratified in those treated with continuous ambulatory PD (CAPD, n=24), automated PD (APD, n=23) and APD with one bag change (CAPD+APD, n=10)...
May 25, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/28524237/in-vitro-dialysis-of-cytokine-rich-plasma-with-high-and-medium-cut-off-membranes-reduces-its-procalcific-activity
#5
Kevin Willy, Michael Hulko, Markus Storr, Rose Speidel, Julia Gauss, Ralf Schindler, Daniel Zickler
Recently developed high-flux (HF) dialysis membranes with extended permeability provide better clearance of middle-sized molecules such as interleukins (ILs). Whether this modulation of inflammation influences the procalcific effects of septic plasma on vascular smooth muscle cells (VSMCs) is not known. To assess the effects of high cut-off (HCO) and medium cut-off (MCO) membranes on microinflammation and in vitro vascular calcification we developed a miniature dialysis model. Plasma samples from lipopolysaccharide-spiked blood were dialyzed with HF, HCO, and MCO membranes in an in vitro miniature dialysis model...
May 19, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28521250/development-and-validation-of-lc-ms-ms-methods-for-the-measurement-of-ribociclib-a-cdk4-6-inhibitor-in-mouse-plasma-and-ringer-s-solution-and-its-application-to-a-cerebral-microdialysis-study
#6
Ashish Kala, Yogesh T Patel, Abigail Davis, Clinton F Stewart
LC-MS/MS methods to measure ribociclib in mouse plasma and Ringer's solution were successfully developed and validated. Reverse phase chromatography was performed with gradient elution using C18 (100A, 50×4.6mm, 3μ) and C8-A (50×2.0mm, 5μ) columns for plasma and Ringer's samples, respectively. Mouse plasma samples were extracted using solid phase extraction method, whereas no extraction was required for the Ringer's solution samples. Analytes were detected using positive ion MRM mode. The precursor to product ions (Q1→Q3) selected for ribociclib and d6-ribociclib were (m/z) 435...
July 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28516771/highly-selective-cerebral-atp-assay-based-on-micrometer-scale-ion-current-rectification-at-polyimidazolium-modified-micropipettes
#7
Kailin Zhang, Xiulan He, Yang Liu, Ping Yu, Junjie Fei, Lanqun Mao
Development of new principles and methods for cerebral ATP assay is highly imperative not only for determining ATP dynamics in brain but also for understanding physiological and pathological processes related to ATP. Herein, we for the first time demonstrate that micrometer scale ion current rectification (MICR) at a polyimidazolium-modified micropipet can be used as the signal transduction output for the cerebral ATP assay with high selectivity. The rationale for ATP assay is essentially based on the competitive binding of the negatively charged ATP aptamer toward positively charged polyimidazolium and ATP...
May 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28512055/first-plasma-and-tissue-pharmacokinetic-study-of-the-ysnsg-cyclopeptide-a-new-integrin-antagonist-using-microdialysis
#8
Florian Slimano, Zoubir Djerada, Salim Bouchene, Laurence Van Gulick, Sylvie Brassart-Pasco, Sylvain Dukic
The YSNSG peptide is a synthetic peptide targeting αvβ3 integrin. This peptide exhibits promising activity in vitro and in vivo against melanoma. To determine pharmacokinetic parameters and predictive active doses in the central nervous system (CNS) and subcutaneous tissue (SC), we conducted microdialysis coupled with pharmacokinetic modeling and Monte Carlo simulation. After a recovery period of surgical procedures, a microdialysis probe was inserted in the caudate and in subcutaneous tissue. Plasma samples and dialysates collected 5h after YSNSG intravenous administration (10mg/kg) were analyzed by UPLC-MS/MS...
May 13, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28509350/high-sodium-continuous-veno-venous-hemodialysis-with-regional-citrate-anticoagulation-and-online-dialysate-generation-in-patients-with-acute-liver-failure-and-cerebral-edema
#9
Tamim Hamdi, Lenar Yessayan, Jerry Yee, Balazs Szamosfalvi
INTRODUCTION: Acute liver failure is associated with a high mortality rate. Induction of plasma hypertonicity with mannitol or hypertonic saline remains the cornerstone in the management of resultant cerebral edema. Significant disadvantages of this approach include poor or unpredictable control of serum sodium concentration and volume expansion, among others. METHODS: We used high sodium continuous veno-venous hemodialysis with regional citrate anticoagulation and online dialysate generation to accurately control the serum sodium in eleven patients with acute liver failure, renal failure, and cerebral edema...
May 16, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28508128/the-cardiothoracic-ratio-and-all-cause-and-cardiovascular-disease-mortality-in-patients-undergoing-maintenance-hemodialysis-results-of-the-mbd-5d-study
#10
Hiroaki Ogata, Junji Kumasawa, Shingo Fukuma, Masahide Mizobuchi, Eriko Kinugasa, Masafumi Fukagawa, Shunichi Fukuhara, Tadao Akizawa
BACKGROUND: The cardiothoracic ratio (CTR) is a non-invasive left ventricular hypertrophy index. However, whether CTR associates with cardiovascular disease (CVD) and mortality in hemodialysis (HD) populations is unclear. METHODS: Using a Mineral and Bone disorder Outcomes Study for Japanese CKD Stage 5D Patients (MBD-5D Study) subcohort, 2266 prevalent HD patients (age 62.8 years, female 38.0%, HD duration 9.4 years) with secondary hyperparathyroidism (SHPT) whose baseline CTR had been recorded were selected...
May 15, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/28507512/changes-in-dopamine-transmission-in-the-nucleus-accumbens-shell-and-core-during-ethanol-and-sucrose-self-administration
#11
Valentina Bassareo, Flavia Cucca, Roberto Frau, Gaetano Di Chiara
Ethanol, like other substances of abuse, preferentially increases dopamine (DA) transmission in the rat nucleus accumbens (NAc) following passive administration. It remains unclear, however, whether ethanol also increases NAc DA transmission following operant oral self-administration (SA). The NAc is made-up of a ventro-medial compartment, the shell and a dorso-lateral one, the core, where DA transmission responds differentially following exposure to drugs of abuse. Previous studies from our laboratory investigated changes in dialysate DA in the NAc shell and core of rats responding for sucrose pellets and for drugs of abuse...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28504549/determination-of-naloxegol-in-human-biological-matrices
#12
Yan Li, Mark Hoffmann, Paul Severin
AIM: Naloxegol is an oral peripherally acting μ-opioid receptor antagonist approved for the treatment of opioid-induced constipation. Sensitive, robust, bioanalytical methods were required to quantitate naloxegol in human biological matrices as part of the clinical development program. Results/methodology: Analytical plasma samples were prepared using Solid Phase Extraction (SPE) coupled with concentration. The method's linearity was established at 0.1-50 ng/ml with up to 100-fold dilution...
May 15, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28502735/effects-of-low-calcium-dialysate-on-the-progression-of-coronary-artery-calcification-in-hemodialysis-patients-an-open-label-12-month-randomized-clinical-trial
#13
Soo Jin Kim, Young-Ki Lee, Jieun Oh, AJin Cho, Jung Woo Noh
BACKGROUND: The association between the dialysate calcium level and coronary artery calcification (CAC) has not yet been evaluated in hemodialysis patients. The objective of this study was to determine whether lowering the dialysate calcium levels would decrease the progression of coronary artery calcification (CAC) compared to using standard calcium dialysate. METHODS: We conducted an open-label randomized trial with parallel groups. The patients were randomly assigned to either 12-month treatment with low calcium dialysate (LCD; 1...
May 4, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28495592/mir-21-promotes-fibrogenesis-in-peritoneal-dialysis
#14
Melisa Lopez-Anton, Mark Lambie, Manuel Lopez-Cabrera, Claus P Schmitt, Vicente Ruiz-Carpio, Maria Bartosova, Betti Schaefer, Simon Davies, Timothy Stone, Robert Jenkins, Philip R Taylor, Nicholas Topley, Timothy Bowen, Donald Fraser
Peritoneal dialysis (PD) is a life-saving form of renal replacement therapy for those with end-stage kidney disease. Mesothelial cells (MCs) line the peritoneal cavity and help define peritoneal response to treatment-associated injury, a major reason for treatment failure. miRNAs are important regulators, but their roles in peritoneal fibrosis are largely unknown. In this study, miR-21 was one of the most abundant miRNAs in primary MCs, and was up-regulated by the profibrotic cytokine transforming growth factor-β1 and in PD effluent-derived MCs exhibiting mesenchymal phenotypic change...
May 8, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28495360/fractures-and-osteomalacia-in-a-patient-treated-with-frequent-home-hemodialysis
#15
Mark R Hanudel, Larry Froch, Barbara Gales, Harald Jüppner, Isidro B Salusky
Bone deformities and fractures are common consequences of renal osteodystrophy in the dialysis population. Persistent hypophosphatemia may be observed with more frequent home hemodialysis regimens, but the specific effects on the skeleton are unknown. We present a patient with end-stage renal disease treated with frequent home hemodialysis who developed severe bone pain and multiple fractures, including a hip fracture and a tibia-fibula fracture complicated by nonunion, rendering her nonambulatory and wheelchair bound for more than a year...
May 9, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28490530/il-6-promotes-epithelial-to-mesenchymal-transition-of-human-peritoneal-mesothelial-cells-possibly-through-jak2-stat3-signaling-pathway
#16
Jing Xiao, Yanan Gong, Ying Chen, Dahai Yu, Xiaoyang Wang, Xiaoxue Zhang, Yanna Dou, Dong Liu, Genyang Cheng, Shan Lu, Wenming Yuan, Yansheng Li, Zhanzheng Zhao
Long-term peritoneal dialysis (PD) therapy results in functional and structural alteration of the peritoneal membrane, including epithelial-to-mesenchymal transition (EMT). Interleukin 6 (IL-6) is a local pleiotropic cytokine, hypothesized to play an important role in EMT. This study was designed to investigate the role of IL-6 in EMT and peritoneal membrane dysfunction in long-term PD patients by assessing the level of IL-6 in dialysate and exploring the relationship between IL-6, the related signaling pathway JAK2/STAT3, and EMT, using in vitro cellular and molecular techniques...
May 10, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28489182/acute-effects-of-intradialytic-aerobic-exercise-on-solute-removal-blood-gases-and-oxidative-stress-in-patients-with-chronic-kidney-disease
#17
Joseane Böhm, Mariane Borba Monteiro, Francini Porcher Andrade, Francisco Veronese, Fernando Saldanha Thomé
Introduction: Hemodialysis contributes to increased oxidative stress and induces transitory hypoxemia. Compartmentalization decreases the supply of solutes to the dialyzer during treatment. The aim of this study was to investigate the acute effects of intradialytic aerobic exercise on solute removal, blood gases and oxidative stress in patients with chronic kidney disease during a single hemodialysis session. Methods: Thirty patients were randomized to perform aerobic exercise with cycle ergometer for lower limbs during 30 minutes with intensity between 60-70% of maximal heart rate, or control group (CG)...
April 27, 2017: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/28483384/-online-hemodiafiltration-practical-aspects-safety-and-efficacy
#18
Bernard Canaud, Leïla Chénine, Hélène Leray-Moraguès, Laure Patrier, Annie Rodriguez, A Gontier-Picard, Marion Moréna
Purification of high molecular uremic toxins by conventional hemodialysis is limited. It remains associated with a high morbidity and excessively high mortality. Online hemodiafiltration using a high permeability hemodiafilter, an ultrapure dialysate, and which tends to maximize substitution volumes, provides a high efficiency and low bio-incompatibility renal supplementation. Regular use of online hemodiafiltration is associated with reduced morbidity (reduction of intradialytic hypotension episodes, improved blood pressure control, reduced inflammatory profile, better anemia correction and prevention of β2-microglobulin-associated amyloidosis)...
May 2017: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/28447486/guidance-to-develop-individual-dose-recommendations-for-patients-on-chronic-hemodialysis
#19
Verena Gotta, Kim Dao, Frédérique Rodieux, Thierry Buclin, Françoise Livio, Marc Pfister
In addition to tailored clinical trials in patients on chronic hemodialysis (HD) during drug development, clinician-initiated post-marketing studies and case reports on individual pharmacokinetic (PK) assessments provide an important source of information about drug dialysability and individualized dose recommendations in this vulnerable population. Areas covered: First, factors that may alter drug exposure in HD patients are explained. Second, available regulatory and methodological guidelines for PK assessments in this population are summarized...
April 27, 2017: Expert Review of Clinical Pharmacology
https://www.readbyqxmd.com/read/28443351/current-and-future-chemical-therapies-for-treating-anaemia-in-chronic-kidney-disease
#20
Francesco Locatelli, Lucia Del Vecchio, Maria Carmen Luise
Erythropoiesis-stimulating agents (ESAs) are not perfect, since they have potential side effects. Iron therapy is also receiving growing attention in recent years. Areas covered: We performed a literature search on PubMed using the following key words: anemia, chronic kidney disease, HIF stabilisers, sotatercept, actin traps, iron, iron-containing phosphate binders, iron dialysate. We reviewed new drugs that are under clinical development to obtain better safety and activity and/or easier and cheaper manufacturing processes in comparison to available ESAs...
June 2017: Expert Opinion on Pharmacotherapy
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