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https://www.readbyqxmd.com/read/29718469/pre-dialysis-fluid-status-pre-dialysis-systolic-blood-pressure-and-outcome-in-prevalent-haemodialysis-patients-results-of-an-international-cohort-study-on-behalf-of-the-mondo-initiative
#1
Marijke Dekker, Constantijn Konings, Bernard Canaud, Paola Carioni, Adrian Guinsburg, Magdalena Madero, Jeroen van der Net, Jochen Raimann, Frank van der Sande, Stefano Stuard, Len Usvyat, Yuedong Wang, Xiaoqi Xu, Peter Kotanko, Jeroen Kooman
Background: Pre-dialysis fluid overload (FO) associates with mortality and causes elevated pre-dialysis systolic blood pressure (pre-SBP). However, low pre-SBP is associated with increased mortality in haemodialysis patients. The objective of this study was to investigate the interaction between pre-dialysis fluid status (FS) and pre-SBP in association with mortality. Methods: We included all patients from the international Monitoring Dialysis Outcome Initiative (MONDO) database with a pre-dialysis multifrequency bioimpedance spectroscopy measurement in the year 2011...
April 27, 2018: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29688718/a-two-dimensional-zigzag-silica-polymorph-on-a-metal-support
#2
David Kuhness, Hyun Jin Yang, Hagen W Klemm, Mauricio Prieto, Gina Peschel, Alexander Fuhrich, Dietrich Menzel, Thomas Schmidt, Xin Yu, Shamil Shaikhutdinov, Adrian Lewandowski, Markus Heyde, Anna Kelemen, Radoslaw Wlodarczyk, Denis Usvyat, Martin Schütz, Joachim Sauer, Hans-Joachim Freund
We present a new polymorph of the two dimensional (2D) silica film with a characteristic 'zigzag' line structure and a rectangular unit cell which forms on a Ru(0001) metal substrate. This new silica polymorph may allow for important insights into growth modes and transformations of 2D silica films as a model system for the study of glass transitions. Based on scanning tunneling microscopy, low energy electron diffraction, infrared reflection absorption spectroscopy and x-ray photo-electron spectroscopy measurements on the one hand, and density functional theory calculations on the other, a structural model for the 'zigzag' polymorph is proposed...
April 24, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29609536/effects-of-dialysate-to-serum-sodium-na-alignment-in-chronic-hemodialysis-hd-patients-retrospective-cohort-study-from-a-quality-improvement-project
#3
Jochen G Raimann, Linda H Ficociello, Len A Usvyat, Hanjie Zhang, Lisa Pacelli, Sandi Moore, Penny Sheppard, Qingqing Xiao, Yuedong Wang, Claudy Mullon, Paul Balter, Terry Sullivan, Peter Kotanko
BACKGROUND: Evidence indicates favorable effects of dialysate (DNa+ ) to serum sodium concentration (SNa+ ) alignment, however, results from larger sample populations are needed. For this reason, we conducted a retrospective propensity score-matched cohort study from a quality improvement project to investigate the effects of alignment on population of maintenance hemodialysis patients. METHODS: At 4 participating hemodialysis (HD) clinics, patients with SNa+ lower than the standard DNa+ of 137 mEq/L who received HD with DNa+ aligned to the average of the last 4 SNa+ measurements were evaluated (clinicaltrials...
April 2, 2018: BMC Nephrology
https://www.readbyqxmd.com/read/29478048/association-between-heights-of-dialysis-patients-and-outcomes-results-from-a-retrospective-cohort-study-of-the-international-monitoring-dialysis-outcomes-mondo-database-initiative
#4
Samir Patel, Alice Topping, Xiaoling Ye, Hanjie Zhang, Bernard Canaud, Paola Carioni, Cristina Marelli, Adrian Guinsburg, Albert Power, Neill Duncan, Jeroen Kooman, Frank van der Sande, Len A Usvyat, Yuedong Wang, Xiaoqi Xu, Peter Kotanko, Jochen G Raimann
BACKGROUND: Tall people have improved metabolic profiles and better cardiovascular outcomes, a relationship inverted in dialysis patients. We investigated the relationship between height and outcomes in incident hemodialysis (HD) patients commencing treatment in an analysis of the international Monitoring Dialysis Outcomes (MONDO) database. METHODS: In this retrospective cohort study, we included incident HD patients commencing treatment between -January 1, 2006 and December 31, 2010 and investigated the association between height and mortality using the MONDO database...
2018: Blood Purification
https://www.readbyqxmd.com/read/29478044/relationships-between-neighborhood-walkability-and-objectively-measured-physical-activity-levels-in-hemodialysis-patients
#5
Maggie Han, Xiaoling Ye, Priscila Preciado, Schantel Williams, Israel Campos, Marcee Bonner, Candace Young, Daniel Marsh, John W Larkin, Len A Usvyat, Franklin W Maddux, Roberto Pecoits-Filho, Peter Kotanko
BACKGROUND/AIMS: Neighborhood walkability is associated with indicators of health in the general population. We explored the association between neighborhood walkability and daily steps in hemodialysis (HD) patients. METHODS: We measured daily steps over 5 weeks using Fitbit Flex (Fitbit, San Francisco, CA, USA) and retrieved Walk Score® (WS) data by patient's home ZIP code (www.walkscore.com; 0 = poorest walkability; 100 = greatest walkability). RESULTS: HD patients took a mean of 6,393 ± 3,550 steps/day (n = 46)...
2018: Blood Purification
https://www.readbyqxmd.com/read/29423211/depressive-affect-in-incident-hemodialysis-patients
#6
Kathryn A McDougall, John W Larkin, Rebecca L Wingard, Yue Jiao, Sophia Rosen, Lin Ma, Len A Usvyat, Franklin W Maddux
Background: The prevalence of depressive affect is not well defined in the incident hemodialysis (HD) population. We investigated the prevalence of and associated risk factors and hospitalization rates for depressive affect in incident HD patients. Methods: We performed a prospective investigation using the Patient Health Questionnaire 2 (PHQ2) depressive affect assessment. From January to July of 2013 at 108 in-center clinics randomly selected across tertiles of baseline quality measures, we contacted 577 and 543 patients by telephone for depressive affect screening...
February 2018: Clinical Kidney Journal
https://www.readbyqxmd.com/read/29414829/the-association-of-weekly-pre-hemodialysis-systolic-blood-pressure-and-following-week-mortality
#7
Dugan Maddux, Len A Usvyat, Danqing Xu, Yuedong Wang, Peter Kotanko, Frank M van der Sande, Jeroen P Kooman, Franklin W Maddux
BACKGROUND/AIMS: Few studies examine the impact of systolic blood pressure (SBP) on mortality in the incident hemodialysis (HD) period, and throughout the first HD year. This large retrospective observational study analyzes the impact of "current" and cumulative low preSBP <110 mmHg (L), and variations in preSBP on short-term (1 week) mortality over the first HD year. METHODS: Weekly mean preSBP for HD weeks 1 to 51 was categorized into L or high preSBP>=110 mmHg (H) for each patient...
2018: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29149476/clinical-parameters-before-and-after-the-transition-to-dialysis
#8
Dugan W Maddux, Len A Usvyat, Terry Ketchersid, Yue Jiao, Tommy C Blanchard, Peter Kotanko, Frank M van der Sande, Jeroen P Kooman, Franklin W Maddux
INTRODUCTION: The transition from pre-dialysis chronic kidney disease (CKD) to post-dialysis start is a critical period associated with high patient mortality and increased hospital admissions. Little is known about the trends of key clinical and laboratory parameters through this time of transition to start dialysis. METHODS: De-identified data including demographics, vital signs, lab results, and eGFR from the Fresenius Medical Care-CKD Registry were analyzed to determine trends in clinical and laboratory parameters through the time of transition from 12 months pre-dialysis start to 12 months post-dialysis start...
November 17, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/29130949/performance-of-the-surprise-question-compared-to-prediction-models-in-hemodialysis-patients-a-prospective-study
#9
Rakesh Malhotra, Xia Tao, Yuedong Wang, Yuqi Chen, Rebecca H Apruzzese, Paul Balter, Qingqing Xiao, Len A Usvyat, Peter Kotanko, Stephan Thijssen
BACKGROUND: The surprise question (SQ) ("Would you be surprised if this patient were still alive in 6 or 12 months?") is used as a mortality prognostication tool in hemodialysis (HD) patients. We compared the performance of the SQ with that of prediction models (PMs) for 6- and 12-month mortality prediction. METHODS: Demographic, clinical, laboratory, and dialysis treatment indicators were used to model 6- and 12-month mortality probability in a HD patients training cohort (n = 6,633) using generalized linear models (GLMs)...
2017: American Journal of Nephrology
https://www.readbyqxmd.com/read/28943158/dynamics-of-nutritional-competence-in-the-last-year-before-death-in-a-large-cohort-of-us-hemodialysis-patients
#10
Xiaoling Ye, Marijke J E Dekker, Franklin W Maddux, Peter Kotanko, Constantijn J A M Konings, Jochen G Raimann, Frank M van der Sande, Len A Usvyat, Jeroen P Kooman, Stephan Thijssen
OBJECTIVES: Recently, a new Nutritional Competence Score (NCS) has been shown to associate with hospitalization and outcome in hemodialysis patients. The aim of this study was to investigate the dynamics, the individual components, and the impact of hospitalizations of this score's trajectory in the year before death. In addition, we investigated whether dynamics in the NCS add additional independent prognostic value over a single cross-sectional assessment. DESIGN: We included all Fresenius Medical Care North America patients who initiated hemodialysis between January 1, 2006, and December 31, 2011 with data on all 5 NCS components (serum albumin, creatinine, phosphate, equilibrated normalized protein catabolic rate, and interdialytic weight gain) in at least 1 month...
November 2017: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/28851317/the-dynamics-of-the-metabolism-of-acetate-and-bicarbonate-associated-with-use-of-hemodialysates-in-the-abchd-trial-a-phase-iv-prospective-single-center-single-blind-randomized-cross-over-two-week-investigation
#11
RANDOMIZED CONTROLLED TRIAL
William B Smith, Sandy Gibson, George E Newman, Kendra S Hendon, Margarita Askelson, James Zhao, Jamil Hantash, Brigid Flanagan, John W Larkin, Len A Usvyat, Ravi I Thadhani, Franklin W Maddux
BACKGROUND: In the United States, hemodialysis (HD) is generally performed via a bicarbonate dialysate. It is not known if small amounts of acid used in dialysate to buffer the bicarbonate can meaningfully contribute to overall buffering administered during HD. We aimed to investigate the metabolism of acetate with use of two different acid buffer concentrates and determine if it effects blood bicarbonate concentrations in HD patients. METHODS: The Acid-Base Composition with use of hemoDialysates (ABChD) trial was a Phase IV, prospective, single blind, randomized, cross-over, 2 week investigation of peridialytic dynamics of acetate and bicarbonate associated with use of acid buffer concentrates...
August 29, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28765166/impact-of-the-karnofsky-performance-status-on-survival-and-its-dynamics-during-the-terminal-year-of-peritoneal-dialysis-patients
#12
Ana Paula Modesto, Len Usvyat, Viviane Calice-Silva, Dandara Novakowski Spigolon, Ana Elizabeth Figueiredo, Thyago Proença de Moraes, Marcia Olandoski, Silvia Emiko Shimakura, Pasqual Barreti, Peter Kotanko, Roberto Pecoits-Filho
BACKGROUND: Simple and low-cost tools to monitor the risk profile of patients on peritoneal dialysis (PD) at high risk of complications and mortality are scarce. One of the tools available to monitor the variation in vitality and dependence levels is the Karnofsky performance status (KPS). This study analyzed the average trends and variation of KPS during the 12 months before death and its independent value in predicting patients' survival. METHODS: The data were compiled from the BRAZPD II multicenter study, performed in Brazil between 2004 and 2011...
January 2018: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28720321/no-evidence-for-progressive-deterioration-in-stimulated-insulin-secretion-in-renal-transplant-recipients-after-12years-tacrolimus-exposure
#13
Mariëlle A C J Gelens, Johannes P van Hooff, Len Usvyat, Maarten H Christiaans
AIMS: Tacrolimus (Tac) inhibits insulin secretion in a Tac-trough blood level dependent way early post-transplant in renal transplant recipients (Rtx). It is unknown whether long-term exposure results into a progressive beta cells dysfunction. METHODS: Two independent cohorts of Tac-treated non-diabetic Rtx, previously participating in glucose metabolism studies using intravenous Glucose Tolerance Test (ivGTT) were included: Fifty-eight Rtx were tested by ivGTT cross-sectional between 0...
July 4, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28701312/inflammation-and-premature-aging-in-advanced-chronic-kidney-disease
#14
REVIEW
Jeroen P Kooman, Marijke J Dekker, Len A Usvyat, Peter Kotanko, Frank M van der Sande, Casper G Schalkwijk, Paul G Shiels, Peter Stenvinkel
Systemic inflammation in end-stage renal disease is an established risk factor for mortality and a catalyst for other complications, which are related to a premature aging phenotype, including muscle wasting, vascular calcification, and other forms of premature vascular disease, depression, osteoporosis, and frailty. Uremic inflammation is also mechanistically related to mechanisms involved in the aging process, such as telomere shortening, mitochondrial dysfunction, and altered nutrient sensing, which can have a direct effect on cellular and tissue function...
October 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28666073/to-cool-or-too-cool-is-reducing-dialysate-temperature-the-optimal-approach-to-preventing-intradialytic-hypotension
#15
John W Larkin, Marta M Reviriego-Mendoza, Len A Usvyat, Peter Kotanko, Franklin W Maddux
Abnormal decreases in blood pressure during hemodialysis are frequent in end stage renal disease (ESRD) patients treated with hemodialysis, and thought to be largely due to an inadequate cardiovascular response to the rapid blood volume decline. Intradialytic hypotension (IDH) and cardiac instability during dialysis can increase risks for negative health consequences and is possibly preventable though several types of interventions. One intervention that holds promise for prevention of IDH in hemodialysis patients is to reduce the temperature of the dialysate to or below the patient's core temperature...
November 2017: Seminars in Dialysis
https://www.readbyqxmd.com/read/28571392/a-comparison-between-quantum-chemistry-and-quantum-monte-carlo-techniques-for-the-adsorption-of-water-on-the-001-lih-surface
#16
Theodoros Tsatsoulis, Felix Hummel, Denis Usvyat, Martin Schütz, George H Booth, Simon S Binnie, Michael J Gillan, Dario Alfè, Angelos Michaelides, Andreas Grüneis
We present a comprehensive benchmark study of the adsorption energy of a single water molecule on the (001) LiH surface using periodic coupled cluster and quantum Monte Carlo theories. We benchmark and compare different implementations of quantum chemical wave function based theories in order to verify the reliability of the predicted adsorption energies and the employed approximations. Furthermore we compare the predicted adsorption energies to those obtained employing widely used van der Waals density-functionals...
May 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28531888/right-trac%C3%A2-post-hospitalization-care-transitions-program-to-reduce-readmissions-for-hemodialysis-patients
#17
MULTICENTER STUDY
Rebecca L Wingard, Kathryn McDougall, Billie Axley, Andrew Howard, Cathleen O''Keefe, Nancy Armistead, Janet R Lynch, Sophia Rosen, Len Usvyat, Franklin W Maddux
BACKGROUND: Hemodialysis (HD) patients have high hospitalization rates. This nonrandomized trial tested the effect of a bundle of renal-specific "Right TraC™" strategies on 30-day all-cause readmission rates and, secondarily, 90-day readmissions and overall admissions among HD patients. METHODS: Twenty-six Fresenius clinics in West Virginia, Ohio, and Kentucky participated in the interventions. Eighteen matched clinics served as controls; intervention clinics also served as their own controls...
2017: American Journal of Nephrology
https://www.readbyqxmd.com/read/28514783/dialysis-access-as-an-area-of-improvement-in-elderly-incident-hemodialysis-patients-results-from-a-cohort-study-from-the-international-monitoring-dialysis-outcomes-initiative
#18
COMPARATIVE STUDY
Jochen G Raimann, Claudia Barth, Len A Usvyat, Priscila Preciado, Bernard Canaud, Michael Etter, Xiaoqi Xu, Adrian Guinsburg, Christina Marelli, Neill Duncan, Albert Power, Frank M van der Sande, Jeroen P Kooman, Stephan Thijssen, Yuedong Wang, Peter Kotanko
BACKGROUND: Commencing hemodialysis (HD) using a catheter is associated with a higher risk of adverse outcomes, and early conversion from central-venous catheter (CVC) to arteriovenous fistula/graft (non-CVC) improves outcomes. We investigated CVC prevalence and conversion, and their effects on outcomes during the first year of HD in a multinational cohort of elderly patients. METHODS: Patients ≥70 years from the MONDO Initiative who commenced HD between 2000 and 2010 in Asia-Pacific, Europe, North-, and South-America and survived at least 6 months were included in this investigation...
2017: American Journal of Nephrology
https://www.readbyqxmd.com/read/28256647/dispersion-interactions-in-silicon-allotropes
#19
Antti J Karttunen, Denis Usvyat, Martin Schütz, Lorenzo Maschio
van der Waals interactions are known to play a key role in the formation of weakly bound solids, such as molecular or layered crystals. Here we show that the correct quantum-chemical description of van der Waals dispersion is also essential for a correct description of the relative stability between purely covalently-bound solids like silicon allotropes. To this end, we apply periodic local MP2 and DFT with Grimme's empirical -D3 correction to 11 experimentally determined or yet hypothetical crystalline silicon structures, including the most recently discovered silicon allotropes...
March 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28248525/exfoliation-energy-of-black-phosphorus-revisited-a-coupled-cluster-benchmark
#20
Martin Schütz, Lorenzo Maschio, Antti J Karttunen, Denis Usvyat
Black phosphorus (black-P) consists of phosphorene sheets, stacked by van der Waals dispersion. In a recent study based on periodic local second-order Møller-Plesset perturbation theory (LMP2) with higher-order corrections evaluated on finite clusters, we obtained a value of -151 meV/atom for the exfoliation energy. This is almost twice as large as another recent theoretical result (around -80 meV/atom) obtained with quantum Monte Carlo (QMC). Here, we revisit this system on the basis of the recently implemented, periodically embedded ring coupled cluster (rCCD) model instead of LMP2...
March 16, 2017: Journal of Physical Chemistry Letters
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