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Clearance glomerular filtration rate

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https://www.readbyqxmd.com/read/28445401/tradeoff-in-the-nephron-a-theory-to-explain-the-primacy-of-phosphate-in-the-pathogenesis-of-secondary-hyperparathyroidism
#1
Kenneth R Phelps
Chronic kidney disease (CKD) causes secondary hyperparathyroidism (SHPT). The cardinal features of SHPT are persistence of normocalcemia as CKD progresses and dependence of the parathyroid hormone concentration ([PTH]) on phosphate influx (IP). The tradeoff-in-the-nephron hypothesis integrates these features. It states that as the glomerular filtration rate (GFR) falls, the phosphate concentration ([P]CDN) rises in the cortical distal nephron, the calcium concentration ([Ca]CDN) in that segment falls, and [PTH] rises to maintain normal calcium reabsorption per volume of filtrate (TRCa/GFR)...
April 26, 2017: Nutrients
https://www.readbyqxmd.com/read/28443538/iohexol-clearance-for-determination-of-glomerular-filtration-rate-in-cynomolgus-monkeys-macaca-fascicularis
#2
Changqing Zhang, Shanshan Ding, Yupeng Fang, Li Zhang, Weimin Hu, Jinlian Lu, Tao Jing, Yi Tao, Xin Zhang
The purpose of this study was to validate a method for determine the glomerular filtration rate (GFR) in healthy cynomolgus monkeys by using iohexol. Eighteen healthy cynomolgus macaque monkeys (age, 4 to 6 y [mean, 5 y]; weight, 2 to 6 kg [mean, 4 kg]) were randomly entered into 3 different doses groups (3 male and 3 female macaques per group) of 30, 60, 90 mg I/kg to receive an intravenous bolus injection of iohexol. Serum iohexol concentrations were determined by using liquid chromatography-tandem mass spectrometry, and clearance rate were determined by using WinNonlin software...
April 25, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/28443267/no-impact-of-the-analytical-method-used-for-determining-cystatin-c-on-estimating-glomerular-filtration-rate-in-children
#3
Martin Alberer, Julia Hoefele, Marcus R Benz, Arend Bökenkamp, Lutz T Weber
BACKGROUND: Measurement of inulin clearance is considered to be the gold standard for determining kidney function in children, but this method is time consuming and expensive. The glomerular filtration rate (GFR) is on the other hand easier to calculate by using various creatinine- and/or cystatin C (Cys C)-based formulas. However, for the determination of serum creatinine (Scr) and Cys C, different and non-interchangeable analytical methods exist. Given the fact that different analytical methods for the determination of creatinine and Cys C were used in order to validate existing GFR formulas, clinicians should be aware of the type used in their local laboratory...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28434550/renal-failure-after-cardiac-operations-not-all-acute-kidney-injury-is-the-same
#4
Todd C Crawford, J Trent Magruder, Joshua C Grimm, Shin-Rong Lee, Alejandro Suarez-Pierre, David Lehenbauer, Christopher M Sciortino, Robert S Higgins, Duke E Cameron, John V Conte, Glenn J Whitman
BACKGROUND: The Society of Thoracic Surgeons (STS) database does not distinguish between a decline in creatinine clearance vs new hemodialysis (HD) when qualifying acute renal failure (ARF) after a cardiac operation. We hypothesized that patients requiring HD experience significantly greater postoperative morbidity and death. METHODS: We included all patients who underwent STS index cardiac operations at our institution from 2008 to March 2015 and did not have preexisting renal failure (creatinine >4...
April 20, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28426831/representation-and-reporting-of-kidney-disease-in-cerebrovascular-disease-a-systematic-review-of-randomized-controlled-trials
#5
Ioannis Konstantinidis, Shanti Patel, Marianne Camargo, Achint Patel, Priti Poojary, Steven G Coca, Girish N Nadkarni
Patients with kidney disease (KD) are at increased risk for cerebrovascular disease (CVD) and CVD patients with KD have worse outcomes. We aimed to determine the representation of KD patients in major randomized controlled trials (RCTs) of CVD interventions. We searched MEDLINE for reports of major CVD trials published through February 9, 2017. We excluded trials that did not report mortality outcomes, enrolled fewer than 100 participants, or were subgroup, follow-up, or post-hoc analyses. Two independent reviewers performed study selection and data extraction...
2017: PloS One
https://www.readbyqxmd.com/read/28419522/a-general-empirical-model-for-renal-drug-handling-in-pharmacokinetic-analyses
#6
Daniel F B Wright, Stephen B Duffull
Dose adjustment in renal insufficiency is generally based on the assumption that renal drug clearance is related linearly to glomerular filtration rate. The theory underpinning this model is the Intact Nephron Hypothesis, where impaired renal function is said to be caused by a reduction in the number of complete (intact) nephrons. The purpose of this commentary is to propose a general empirical model for renal drug handling. We will explore models for renal function under two scenarios; one that aligns with the intact nephron hypothesis, and one that relaxes the assumptions of this hypothesis...
April 16, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28416419/evaluation-of-renal-transporter-inhibition-employing-creatinine-as-a-substrate-in-vitro-to-assess-the-clinical-risk-of-elevated-serum-creatinine
#7
Sumathy Mathialagan, A David Rodrigues, Bo Feng
Creatinine is a widely accepted biomarker for renal toxicity, but its renal clearance via transporter-mediated active secretion is significant. For a given new chemical entity, therefore, elevations in serum creatinine (SCr) can be caused by the inhibition of one or more renal transporters without renal toxicity. In the present study, an effort was made to assess the correlation between the inhibition of renal transporters in vitro and elevations in SCr. A total of 15 compounds were chosen based on their known effect on SCr and minimal impact on glomerular filtration rate...
April 14, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28412754/efficacy-and-safety-of-a-reduced-calcineurin-inhibitor-dose-combined-with-mycophenolate-mofetil-in-liver-transplant-patients-with-chronic-renal-dysfunction
#8
Pusen Wang, Weitao Que, Hao Li, Lvnan Yan, Zhiren Fu, Qifa Ye, Guihua Chen, Kefeng Dou, Shichun Lu, Zhanyu Yang, Zhijun Zhu, Zhihai Peng, Lin Zhong
Calcineurin inhibitors (CNIs) are frequently given at a reduced dose in combination with mycophenolate mofetil (MMF) to avoid nephrotoxicity, but the optimal reduction in CNI dose has not been established. In this prospective, open-label, multicenter study, liver transplant recipients with chronic renal dysfunction who were administered a CNI-based immunosuppressive regimen were included in the intent-to-treat (ITT) population. The primary endpoint was declination in renal function, which was defined as a ≥ 20% decrease in the glomerular filtration rate during the year following regimen adjustment...
February 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28407629/combining-cystatin-c-and-creatinine-yields-a-reliable-glomerular-filtration-rate-estimation-in-older-adults-in-contrast-to-%C3%AE-trace-protein-and-%C3%AE-2-microglobulin
#9
Karin Werner, Mats Pihlsgård, Sölve Elmståhl, Helen Legrand, Ulf Nyman, Anders Christensson
BACKGROUND: The glomerular filtration rate (GFR) is the most important measure of kidney function and chronic kidney disease (CKD). This study aims to validate commonly used equations for estimated GFR (eGFR) based on creatinine (cr), cystatin C (cys), β-trace protein (BTP), and β2-microglobulin (B2M) in older adults. METHOD: We conducted a validation study with 126 participants aged between 72 and 98 with a mean measured GFR (mGFR) by iohexol clearance of 54 mL/min/1...
April 14, 2017: Nephron
https://www.readbyqxmd.com/read/28404092/tenofovir-alafenamide-versus-tenofovir-disoproxil-fumarate-for-the-treatment-of-patients-with-hbeag-negative-chronic-hepatitis-b-virus-infection-a-randomised-double-blind-phase-3-non-inferiority-trial
#10
Maria Buti, Edward Gane, Wai Kay Seto, Henry L Y Chan, Wan-Long Chuang, Tatjana Stepanova, Aric-Josun Hui, Young-Suk Lim, Rajiv Mehta, Harry L A Janssen, Subrat K Acharya, John F Flaherty, Benedetta Massetto, Andrea L Cathcart, Kyungpil Kim, Anuj Gaggar, G Mani Subramanian, John G McHutchison, Calvin Q Pan, Maurizia Brunetto, Namiki Izumi, Patrick Marcellin
BACKGROUND: The novel prodrug tenofovir alafenamide delivers the nucleotide reverse transcriptase inhibitor tenofovir to target cells more efficiently at a lower dose than tenofovir disoproxil fumarate, thereby reducing systemic exposure. We compared the efficacy and safety of the two drugs in patients with HBeAg-negative chronic hepatitis B virus (HBV) infection in a non-inferiority study. METHODS: In this ongoing randomised, double-blind, phase 3, non-inferiority study in 105 centres in 17 countries, patients with HBeAg-negative chronic HBV were randomly assigned (2:1) by a computer-generated allocation sequence (block size six), stratified by plasma HBV DNA concentration and previous treatment status, to receive once-daily oral doses of tenofovir alafenamide 25 mg or tenofovir disoproxil fumarate 300 mg, each with matching placebo...
November 2016: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28396736/the-clinical-utility-of-kinetic-glomerular-filtration-rate
#11
Eoin D O'Sullivan, Arthur Doyle
Background: In acutely unwell patients with rapidly changing renal function, estimating glomerular filtration rate (GFR) and predicting adverse renal outcomes are challenging and often inaccurate. Kinetic GFR (kGFR) is an estimate of immediate biomarker clearance derived from two discreet measurements that may better represent acute function. Our objective is to assess the clinical utility of kGFR as a predictive tool and examine the association of kGFR to adverse renal outcomes compared with measurements to traditional estimates...
April 2017: Clinical Kidney Journal
https://www.readbyqxmd.com/read/28391266/interpretation-of-the-fractional-excretion-of-sodium-in-the-absence-of-acute-kidney-injury-a-cross-sectional-study
#12
Michiel F Schreuder, Arend Bökenkamp, Joanna A E van Wijk
BACKGROUND/AIMS: The fractional excretion of sodium (FeNa) may be helpful in establishing the cause of acute renal failure. This study was performed to determine the influence of the glomerular filtration rate (GFR), sodium intake, and tubular function on FeNa in children without renal failure. METHODS: In this single institute cross-sectional study, 24-h-urine collections from patients (4-18 years of age, GFR >60 mL/min/1.73 m2) were used when considered reliable, and analyzed to determine sodium excretion, creatinine clearance and FeNa...
April 8, 2017: Nephron
https://www.readbyqxmd.com/read/28389059/renal-response-to-a-protein-load-in-healthy-young-adults-as-determined-by-iohexol-infusion-clearance-cimetidine-inhibited-creatinine-clearance-and-cystatin-c-estimated-glomerular-filtration-rate
#13
Kyle E Rodenbach, Dana Y Fuhrman, Paula S Maier, George J Schwartz
OBJECTIVE: Renal reserve (RR) measures the increase in glomerular filtration rate (GFR) in response to a protein load; lack of RR could indicate subclinical kidney disease but such a test is not routinely used in clinical practice. The purpose of this study was to compare a meat versus liquid protein load in a cystatin C-based (Cys-C) RR test using cimetidine-inhibited creatinine clearance (Cr Cl) and iohexol infusion clearance (Io Cl) for validation. The design was cross-sectional analysis and the setting was a Clinical Research Center...
April 4, 2017: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/28363806/novel-role-of-insulin-in-the-regulation-of-glucose-excretion-by-mourning-doves-zenaida-macroura
#14
Karen L Sweazea, Eldon J Braun, Richard Sparr
In mammals, insulin primarily lowers plasma glucose (PGlu) by increasing its uptake into tissues. Studies have also shown that insulin lowers PGlu in mammals by modulating glomerular filtration rate (GFR). Birds have naturally high PGlu and, although insulin administration significantly decreases glucose concentrations, birds are resistant to insulin-mediated glucose uptake into tissues. Since prior work has not examined the effects of insulin on GFR in birds, the purpose of the present study was to assess whether insulin can augment renal glucose excretion and thereby lower PGlu...
February 20, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28363505/a-different-scintigraphic-approach-to-evaluate-the-glomerular-filtration-rate
#15
T Haciosmanoglu, A O Karacalioglu, T Eyileten, S Ince, N Arslan
OBJECTIVE: Multiple nuclear medicine techniques for measuring renal glomerular filtration rate (GFR) are available but some of them are not practical in daily routine use and others have some accuracy issues. Hence the aim of the study was to design a new camera-based approach to measure the GFR and to compare our results with other measured GFR (mGFR) and estimated GFRs (eGFRs) derived from available measurements and equations used in daily clinical practice. MATERIAL AND METHODS: 34 patients were included in the study...
March 28, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28361424/role-of-prolactin-in-the-regulation-of-bicarbonates-biodynamics-in-female-rat-model-of-cholestasis-of-pregnancy
#16
O A Bulaeva, P A Abramicheva, T A Balakina, O V Smirnova
We studied possible involvement of prolactin in the regulation of bicarbonate biodynamics using female rat model of cholestasis of pregnancy induced by transplantation of the donor pituitary under the renal capsule of a recipient (hyperprolactinemia) and bile duct ligation (cholestasis). The concentration of bicarbonates in the bile and blood, their excretion, clearance, and reabsorption, as well as glomerular filtration rate and excretion of sodium ions were assessed. It was found that the main effect of prolactin was directed to the kidney-regulated pool of bicarbonates and consisted in stimulation of their clearance and inhibition of reabsorption, which led to a decrease in bicarbonate blood concentration...
March 31, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28357606/genetic-variations-in-the-alanine-glyoxylate-aminotransferase-2-agxt2-gene-and-dimethylarginines-levels-in-rheumatoid-arthritis
#17
Theodoros Dimitroulas, James Hodson, Vasileios F Panoulas, Aamer Sandoo, Jacqueline Smith, George Kitas
Rheumatoid arthritis (RA) is associated with high rates of cardiovascular events mainly due to coronary and cerebrovascular atherosclerotic disease. Asymmetric (ADMA) and symmetric (SDMA) dimethylarginines are endogenous inhibitors of nitric oxide synthase and have been repeatedly linked with adverse cardiovascular outcomes in the general population and various disease settings. Alanine-glyoxylate aminotransferase 2 (AGTX2) is considered an alternative metabolic pathway contributing to the clearance of dimethylarginines in humans...
March 29, 2017: Amino Acids
https://www.readbyqxmd.com/read/28356664/comparison-of-serum-creatinine-based-estimating-equations-with-gates-protocol-for-predicting-glomerular-filtration-rate-in-indian-population
#18
A V Mulay, S M Gokhale
In clinical practice, serum creatinine-based predicting equations and Gates protocol based on gamma camera imaging of kidneys after injection of Tc99m-diethylenetriaminepentaacetic acid (DTPA) are commonly used to assess glomerular filtration rate (GFR). Comparison of these methods, especially the chronic kidney disease-epidemiology collaboration (CKD-EPI) equation with gold standard method of assessment of GFR by plasma clearance of Tc-99mDTPA is not well-studied in Indian population. We conducted this study to compare GFR estimation by gamma camera-based Gates protocol and serum creatinine-based predicting equations with GFR measured by plasma clearance of Tc-99mDTPA...
March 2017: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/28356063/daclatasvir-asunaprevir-based-direct-acting-antiviral-therapy-ameliorate-hepatitis-c-virus-associated-cryoglobulinemic-membranoproliferative-glomerulonephritis-a-case-report
#19
Michiko Shimada, Norio Nakamura, Tetsu Endo, Hideaki Yamabe, Masayuki Nakamura, Reiichi Murakami, Ikuyo Narita, Hirofumi Tomita
BACKGROUND: Direct-acting antivirals (DAAs) dramatically improve the treatment of hepatitis C virus (HCV) infections. However, the effects of DAAs on extra-hepatic manifestations such as HCV-associated glomerulonephritis, especially in cases with renal dysfunction, are not well elucidated. CASE PRESENTATION: A 69-year-old Japanese woman was diagnosed as having chronic hepatitis C, genotype 1b at the age of 55. She presented with hypertension, microscopic hematuria, proteinuria, renal dysfunction, purpura, and arthralgia at the age of 61...
March 29, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28345163/pharmacokinetics-and-safety-of-letermovir-a-novel-anti-human-cytomegalovirus-drug-in-patients-with-renal-impairment
#20
D Kropeit, J Scheuenpflug, K Erb-Zohar, A Halabi, H-P Stobernack, E G J Hulskotte, A van Schanke, H Zimmermann, H Rübsamen-Schaeff
AIMS: Human cytomegalovirus remains a significant issue for immunocompromised patients and existing viral polymerase targeting therapies are associated with significant toxicity. Accordingly, the viral terminase complex inhibitor, letermovir, is in development. We assessed letermovir pharmacokinetics in renal impairment. METHODS: This was a Phase 1, open-label, non-randomised trial. Estimated glomerular filtration rate (eGFR) based on the Modification of Diet Renal Disease equation was used to create 3 groups of 8 subjects: healthy function (eGFR ≥90 mL/min/1...
March 26, 2017: British Journal of Clinical Pharmacology
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