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Trujillo J, Alotaibi M, Seif N, Cai X, Larive B, Gassman J, Raphael KL, Cheung AK, Raj DS, Fried LF, Sprague S, Block G, Chonchol M, Middleton JP, Wolf M, Ix JH, Prasad P, Isakova T, Srivastava A. Associations of Kidney Functional Magnetic Resonance Imaging Biomarkers with Markers of Inflammation in Individuals with Chronic Kidney Disease. Kidney360 2024:02200512-990000000-00375. [PMID: 38570905 DOI: 10.34067/kid.0000000000000437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 03/28/2024] [Indexed: 04/05/2024]
Abstract
BACKGROUND Greater fibrosis and decreased oxygenation may amplify systemic inflammation, but data on the associations of kidney functional magnetic resonance imaging (fMRI) measurements of fibrosis (apparent diffusion coefficient [ADC]) and oxygenation (relaxation rate [R2*]) with systemic markers of inflammation are limited. METHODS We evaluated associations of baseline kidney fMRI-derived ADC and R2* with baseline and follow-up serum interleukin-6 (IL-6) and C-reactive protein (CRP) in 127 participants from the COMBINE trial, a randomized, 12-month trial of nicotinamide and lanthanum carbonate vs. placebo in individuals with CKD stages 3-4. Cross-sectional analyses of baseline kidney fMRI biomarkers and markers of inflammation used multivariable linear regression. Longitudinal analyses of baseline kidney fMRI biomarkers and change in markers of inflammation over time used linear mixed effects models. RESULTS Mean±SD eGFR, ADC, and R2* were 32.2±8.7 ml/min/1.73m2, 1.46±0.17 x10-3 mm2/s, and 20.3±3.1 s-1, respectively. Median [IQR] IL-6 and CRP were 3.7 [2.4-4.9] pg/mL and 2.8 [1.2-6.3] mg/L. After multivariable adjustment, IL-6 and CRP were 13.1% and 27.3% higher per 1 SD decrease in baseline cortical ADC. Baseline cortical R2* did not have a significant association with IL-6 or CRP. Mean annual IL-6 and CRP slopes were 0.98 pg/mL per year and 0.91 mg/L per year, respectively. Baseline cortical ADC and R2* did not have significant associations with change in IL-6 or CRP over time. CONCLUSIONS Lower cortical ADC, suggestive of greater fibrosis, was associated with higher systemic inflammation. Baseline kidney fMRI biomarkers did not associate with changes in systemic markers of inflammation over time.
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Affiliation(s)
- Jacquelyn Trujillo
- The Graduate School, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Manal Alotaibi
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
- Department of Medicine, College of Medicine, Umm Al-Qura University, Makkah, SA
| | - Nay Seif
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
- Department of Medicine, Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Xuan Cai
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Brett Larive
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH
| | - Jennifer Gassman
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah
| | - Alfred K Cheung
- Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah
| | - Dominic S Raj
- Division of Renal Diseases and Hypertension, George Washington University School of Medicine and Health Sciences, Washington, DC
| | - Linda F Fried
- Division of Nephrology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Stuart Sprague
- Department of Medicine, NorthShore University HealthSystem, Evanston, IL
| | | | - Michel Chonchol
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado Denver School of Medicine, Aurora, CO
| | - John Paul Middleton
- Department of Medicine, Division of Nephrology, Duke University School of Medicine, Durham, NC
| | - Myles Wolf
- Department of Medicine, Division of Nephrology, Duke University School of Medicine, Durham, NC
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC
| | - Joachim H Ix
- Department of Medicine, Renal Section, University of California San Diego School of Medicine, San Diego, CA
| | - Pottumarthi Prasad
- Department of Radiology, NorthShore University HealthSystem, Evanston, IL
| | - Tamara Isakova
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Anand Srivastava
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
- University of Illinois Chicago, Chicago, IL
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Azim A, Hu B, Gilligan S, Sarwal A, Hartsell S, Pandya V, Raphael KL. How I Evaluate a High Anion Gap Metabolic Acidosis. Clin J Am Soc Nephrol 2024; 19:525-527. [PMID: 37976122 PMCID: PMC11020432 DOI: 10.2215/cjn.0000000000000381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 11/09/2023] [Indexed: 11/19/2023]
Affiliation(s)
- Aniqa Azim
- Department of Internal Medicine, Oregon Health & Science University, Portland, Oregon
| | - Boyu Hu
- Division of Hematology and Hematologic Malignancies, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - Sarah Gilligan
- Division of Hematology and Hematologic Malignancies, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - Amara Sarwal
- Division of Hematology and Hematologic Malignancies, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - Sydney Hartsell
- Division of Hematology and Hematologic Malignancies, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - Vrajesh Pandya
- Department of Pathology, University of Utah, Salt Lake City, Utah
| | - Kalani L. Raphael
- Division of Hematology and Hematologic Malignancies, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
- Medicine Section, VA Salt Lake City Health Care System, Salt Lake City, Utah
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Raphael KL, Katz R, Larive B, Kendrick C, Isakova T, Sprague S, Wolf M, Raj DS, Fried LF, Gassman J, Hoofnagle A, Cheung AK, Ix JH. Oral Sodium Bicarbonate and Bone Turnover in CKD: A Secondary Analysis of the BASE Pilot Trial. J Am Soc Nephrol 2024; 35:57-65. [PMID: 38170601 PMCID: PMC10786609 DOI: 10.1681/asn.0000000000000264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 10/18/2023] [Indexed: 01/05/2024] Open
Abstract
SIGNIFICANCE STATEMENT In CKD, metabolic acidosis is commonly treated with alkali in the hope that it will improve bone health. In a post hoc analysis of the Bicarbonate Administration to Stabilize eGFR Pilot Trial, we investigated whether sodium bicarbonate affects serum levels of bone turnover markers and other hormones related to bone health in individuals with CKD who have normal to slightly reduced total CO2 (20-28 mEq/L). Sodium bicarbonate increased serum levels of α-klotho but had no significant effect on other bone health markers, including intact fibroblast growth factor-23 (iFGF-23), intact parathyroid hormone (iPTH), and bone-specific alkaline phosphatase (B-SAP). Further study is needed to determine the effect of bicarbonate administration on clinical aspects of bone health. BACKGROUND Treatment with alkali has been hypothesized to improve bone health in CKD by mitigating adverse effects of acid on bone mineral. We investigated the effect of treatment with sodium bicarbonate on bone turnover markers and other factors related to bone metabolism in CKD. METHODS This is a post hoc analysis of the Bicarbonate Administration to Stabilize eGFR Pilot Trial in which 194 individuals with CKD and serum total CO2 20-28 mEq/L were randomly assigned to placebo or one of two doses of sodium bicarbonate (0.5 or 0.8 mEq/kg lean body weight per day) for 28 weeks. The following serum measurements were performed at baseline, week 12, and week 28: B-SAP, c-telopeptide, procollagen type I intact N-terminal propeptide, iPTH, iFGF-23, soluble klotho, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D, and tartrate-resistant acid phosphatase 5b. The difference (sodium bicarbonate versus placebo) in mean change of each bone biomarker from baseline was determined using linear mixed models. RESULTS One hundred sixty-eight participants submitted samples for post hoc investigations. Mean eGFR was 37±10 ml/min per 1.73 m2 and mean total CO2 was 24±3 mEq/L at baseline. Sodium bicarbonate induced a dose-dependent increase in soluble klotho levels compared with placebo. There was no significant effect of treatment with either dose of sodium bicarbonate on any of the other bone biomarkers, including iFGF-23, iPTH, and B-SAP. Effects on bone biomarkers were similar in those with baseline serum total CO2 <24 mEq/L compared with those with total CO2 ≥24 mEq/L. CONCLUSIONS In this pilot trial of individuals with CKD and total CO2 20-28 mEq/L, sodium bicarbonate treatment increased serum klotho levels but did not affect other bone health markers over 28 weeks. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER ClinicalTrials.gov, NCT02521181.
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Affiliation(s)
- Kalani L. Raphael
- University of Utah Health and VA Salt Lake City Health Care System, Salt Lake City, Utah
| | - Ronit Katz
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington
| | | | | | - Tamara Isakova
- Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Stuart Sprague
- Division of Nephrology & Hypertension, Northshore University Health System-University of Chicago, Evanston, Illinois
| | - Myles Wolf
- Division of Nephrology, Department of Medicine, Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
| | - Dominic S. Raj
- George Washington University School of Medicine, Washington, DC
| | - Linda F. Fried
- University of Pittsburgh and VA Pittsburgh Health Care System, Pittsburgh, Pennsylvania
| | | | - Andy Hoofnagle
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington
| | - Alfred K. Cheung
- University of Utah Health and VA Salt Lake City Health Care System, Salt Lake City, Utah
| | - Joachim H. Ix
- University of California San Diego and VA San Diego Health Care System, San Diego, California
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Affiliation(s)
- Kekoa Taparra
- From the Department of Radiation Oncology, Stanford Health Care, Palo Alto, CA (K.T.); Hui No Ke Ola Pono, Native Hawaiian Health Care System Maui, Wailuku, HI (M.P.); and the Department of Medicine, University of Utah Health, and the VA Salt Lake City Health Care System - both in Salt Lake City (K.L.R.)
| | - Mālia Purdy
- From the Department of Radiation Oncology, Stanford Health Care, Palo Alto, CA (K.T.); Hui No Ke Ola Pono, Native Hawaiian Health Care System Maui, Wailuku, HI (M.P.); and the Department of Medicine, University of Utah Health, and the VA Salt Lake City Health Care System - both in Salt Lake City (K.L.R.)
| | - Kalani L Raphael
- From the Department of Radiation Oncology, Stanford Health Care, Palo Alto, CA (K.T.); Hui No Ke Ola Pono, Native Hawaiian Health Care System Maui, Wailuku, HI (M.P.); and the Department of Medicine, University of Utah Health, and the VA Salt Lake City Health Care System - both in Salt Lake City (K.L.R.)
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Pao AC, Shahzad SR, Song S, Ganesan C, Conti S, Leppert J, Cheung AK, Ix JH, Isakova T, Wolf M, Raj DS, Sprague SM, Fried LF, Gassman J, Fong P, Koike S, Raphael KL. Response to Alkali Administration in Women and Men With and Without CKD. Kidney Med 2023; 5:100670. [PMID: 37492113 PMCID: PMC10363557 DOI: 10.1016/j.xkme.2023.100670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023] Open
Affiliation(s)
- Alan C. Pao
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
- Department of Urology, Stanford University School of Medicine, Palo Alto, California
| | - Sheikh R. Shahzad
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
| | - Shen Song
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
| | - Calyani Ganesan
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
| | - Simon Conti
- Department of Urology, Stanford University School of Medicine, Palo Alto, California
| | - John Leppert
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
- Department of Urology, Stanford University School of Medicine, Palo Alto, California
| | - Alfred K. Cheung
- Division of Nephrology and Hypertension, Department of Medicine, University of Utah School of Medicine, Salt Lake City, Utah
| | - Joachim H. Ix
- Division of Nephrology and Hypertension, Department of Medicine, University of California San Diego School of Medicine, San Diego, California
| | - Tamara Isakova
- Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Myles Wolf
- Division of Nephrology, Department of Medicine, Duke Clinical Research Institute, Duke University, Durham, North Carolina
| | - Dominic S. Raj
- Division of Renal Diseases and Hypertension, Department of Medicine, George Washington University School of Medicine, Washington, DC
| | - Stuart M. Sprague
- Department of Medicine, Northshore University Health System, University of Chicago, Evanston, Illinois
| | - Linda F. Fried
- Department of Medicine, University of Pittsburgh and Renal Section, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, Pennsylvania
| | - Jennifer Gassman
- Department of Quantitative Health Sciences, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Peter Fong
- Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University School of Medicine, Portland, Oregon
| | - Seiji Koike
- Biostatistics and Design Program, Oregon Health and Science University, Portland, Oregon
| | - Kalani L. Raphael
- Division of Nephrology and Hypertension, Department of Medicine, University of Utah School of Medicine, Salt Lake City, Utah
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Melamed ML, Raphael KL. Safety of Alkalinization in CKD. Clin J Am Soc Nephrol 2023; 18:433-434. [PMID: 37026750 PMCID: PMC10103364 DOI: 10.2215/cjn.0000000000000130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Affiliation(s)
- Michal L. Melamed
- Department of Medicine, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
| | - Kalani L. Raphael
- Department of Internal Medicine, University of Utah Health and VA Salt Lake City Health Care System, Salt Lake City, Utah
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7
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Uribarri J, Goldfarb DS, Raphael KL, Rein JL, Asplin JR. Beyond the Urine Anion Gap: In Support of the Direct Measurement of Urinary Ammonium. Am J Kidney Dis 2022; 80:667-676. [PMID: 35810828 DOI: 10.1053/j.ajkd.2022.05.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 05/10/2022] [Indexed: 02/02/2023]
Abstract
Ammonium is a major urinary buffer that is necessary for the normal excretion of the daily acid load. Its urinary rate of excretion (UNH4) may be increased several fold in the presence of extrarenal metabolic acidosis. Therefore, measurement of UNH4 can provide important clues about causes of metabolic acidosis. Because UNH4 is not commonly measured in clinical laboratories, the urinary anion gap (UAG) was proposed as its surrogate about 4 decades ago, and it is still frequently used for that purpose. Several published studies strongly suggest that UAG is not a good index of UNH4 and support the concept that direct measurement of UNH4 is an important parameter to define in clinical nephrology. Low UNH4 levels have recently been found to be associated with a higher risk of metabolic acidosis, loss of kidney function, and death in persons with chronic kidney disease, while surrogates like the UAG do not recapitulate this risk. In order to advance the field it is necessary for the medical community to become more familiar with UNH4 levels in a variety of clinical settings. Herein, we review the literature, searching for available data on UNH4 under normal and various pathological conditions, in an attempt to establish reference values to interpret UNH4 results if and when UNH4 measurements become available as a routine clinical test. In addition, we present original data in 2 large populations that provide further evidence that the UAG is not a good predictor of UNH4. Measurement of urine NH4 holds promise to aid clinicians in the care of patients, and we encourage further research to determine its best diagnostic usage.
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Affiliation(s)
- Jaime Uribarri
- Renal Division, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York.
| | | | - Kalani L Raphael
- Oregon Health & Science University and VA Portland Health Care System, Portland, Oregon
| | - Joshua L Rein
- Renal Division, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - John R Asplin
- Litholink Corporation, Laboratory Corporation of America Holdings, Chicago, Illinois
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Bullen AL, Ascher SB, Scherzer R, Garimella PS, Katz R, Hallan SI, Cheung AK, Raphael KL, Estrella MM, Jotwani VK, Malhotra R, Seegmiller JC, Shlipak MG, Ix JH. Markers of Kidney Tubular Secretion and Risk of Adverse Events in SPRINT Participants with CKD. J Am Soc Nephrol 2022; 33:1915-1926. [PMID: 35973732 PMCID: PMC9528325 DOI: 10.1681/asn.2022010117] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 06/13/2022] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Kidney tubular secretion is an essential mechanism for clearing many common antihypertensive drugs and other metabolites and toxins. It is unknown whether novel measures of tubular secretion are associated with adverse events (AEs) during hypertension treatment. METHODS Among 2089 SPRINT (Systolic Blood Pressure Intervention Trial) participants with baseline eGFR <60 ml/min per 1.73 m2, we created a summary secretion score by averaging across the standardized spot urine-to-plasma ratios of ten novel endogenous tubular secretion measures, with lower urine-to-plasma ratios reflecting worse tubular secretion. Multivariable Cox proportional hazards models were used to evaluate associations between the secretion score and risk of a composite of prespecified serious AEs (hypotension, syncope, bradycardia, AKI, electrolyte abnormalities, and injurious falls). The follow-up protocol for SPRINT routinely assessed two laboratory monitoring AEs (hyperkalemia and hypokalemia). RESULTS Overall, 30% of participants experienced at least one AE during a median follow-up of 3.0 years. In multivariable models adjusted for eGFR and albuminuria, lower (worse) secretion scores at baseline were associated with greater risk of the composite AE outcome (hazard ratio per 1-SD lower secretion score, 1.16; 95% confidence interval, 1.04 to 1.27). In analyses of the individual AEs, lower secretion score was associated with significantly greater risk of AKI, serious electrolyte abnormalities, and ambulatory hyperkalemia. Associations were similar across randomized treatment assignment groups. CONCLUSION Among SPRINT participants with CKD, worse tubular secretion was associated with greater risk of AEs, independent of eGFR and albuminuria.
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Affiliation(s)
- Alexander L. Bullen
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
- Division of Nephrology-Hypertension, University of California, San Diego, California
| | - Simon B. Ascher
- Kidney Health Research Collaborative, Department of Medicine, San Francisco Veterans Affairs Health Care System and University of California, San Francisco, California
- Division of Hospital Medicine, University of California Davis, Sacramento, California
| | - Rebecca Scherzer
- Kidney Health Research Collaborative, Department of Medicine, San Francisco Veterans Affairs Health Care System and University of California, San Francisco, California
| | - Pranav S. Garimella
- Division of Nephrology-Hypertension, University of California, San Diego, California
| | - Ronit Katz
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington
| | - Stein I. Hallan
- Department of Clinical and Molecular Medicine, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Nephrology, St Olav University Hospital, Trondheim, Norway
| | - Alfred K. Cheung
- Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah
- Medical Service, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
| | - Kalani L. Raphael
- Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University and VA Portland Health Care System, Portland, Oregon
| | - Michelle M. Estrella
- Kidney Health Research Collaborative, Department of Medicine, San Francisco Veterans Affairs Health Care System and University of California, San Francisco, California
| | - Vasantha K. Jotwani
- Kidney Health Research Collaborative, Department of Medicine, San Francisco Veterans Affairs Health Care System and University of California, San Francisco, California
| | - Rakesh Malhotra
- Division of Nephrology-Hypertension, University of California, San Diego, California
| | - Jesse C. Seegmiller
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
| | - Michael G. Shlipak
- Kidney Health Research Collaborative, Department of Medicine, San Francisco Veterans Affairs Health Care System and University of California, San Francisco, California
| | - Joachim H. Ix
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
- Division of Nephrology-Hypertension, University of California, San Diego, California
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Affiliation(s)
- Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University and Veterans Affairs Portland Health Care System, Portland, Oregon
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Fong P, Wusirika R, Rueda J, Raphael KL, Rehman S, Stack M, de Mattos A, Gupta R, Michels K, Khoury FG, Kung V, Andeen NK. Increased Rates of Supplement-Associated Oxalate Nephropathy During COVID-19 Pandemic. Kidney Int Rep 2022; 7:2608-2616. [PMID: 36120391 PMCID: PMC9464307 DOI: 10.1016/j.ekir.2022.09.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 09/05/2022] [Accepted: 09/05/2022] [Indexed: 11/07/2022] Open
Abstract
Introduction Causes of secondary oxalate nephropathy include enteric dysfunction and excessive intake of oxalate or oxalate precursors. During the COVID-19 pandemic, there has been a dramatic rise in sales of supplements and vitamin C, during which time we observed an apparent increase in the proportion of ingestion-associated oxalate nephropathy. Methods We retrospectively reviewed secondary oxalate nephropathy and compared pre-pandemic (2018–2019) and pandemic (2020–early 2022) time periods. Results We identified 35 patients with kidney biopsy proven (30 native, 5 allograft) oxalate nephropathy at a single academic institution. Supplement-associated oxalate nephropathy comprised a significantly higher proportion of cases during COVID-19 pandemic compared with the preceding 2 years (44% vs. 0%, P = 0.002), and was associated with use of vitamin C, dietary changes, and supplements. Oxalate nephropathy in the kidney allograft, in contrast, remained associated with enteric hyperoxaluria, antibiotic use, and dehydration. Many patients had diabetes mellitus (57%), hypertension (40%) and/or pre-existing chronic kidney disease (CKD, 49%). Of 9 patients in which the potentially causative ingestion was identified and removed, 8 experienced improvement in kidney function. Conclusion There was a shift toward supplements rather than enteric hyperoxaluria as a leading cause of secondary oxalate nephropathy during the COVID-19 pandemic. Kidney outcomes are better than those observed for enteric hyperoxaluria, if the offending agent is identified and removed.
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Ravikumar NPG, Pao AC, Raphael KL. Acid-Mediated Kidney Injury Across the Spectrum of Metabolic Acidosis. Adv Chronic Kidney Dis 2022; 29:406-415. [PMID: 36175078 DOI: 10.1053/j.ackd.2022.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/15/2022] [Accepted: 04/25/2022] [Indexed: 01/25/2023]
Abstract
Metabolic acidosis affects about 15% of patients with chronic kidney disease. As kidney function declines, the kidneys progressively fail to eliminate acid, primarily reflected by a decrease in ammonium and titratable acid excretion. Several studies have shown that the net acid load remains unchanged in patients with reduced kidney function; the ensuing acid accumulation can precede overt metabolic acidosis, and thus, indicators of urinary acid or potential base excretion, such as ammonium and citrate, may serve as early signals of impending metabolic acidosis. Acid retention, with or without overt metabolic acidosis, initiates compensatory responses that can promote tubulointerstitial fibrosis via intrarenal complement activation and upregulation of endothelin-1, angiotensin II, and aldosterone pathways. The net effect is a cycle between acid accumulation and kidney injury. Results from small- to medium-sized interventional trials suggest that interrupting this cycle through base administration can prevent further kidney injury. While these findings inform current clinical practice guidelines, large-scale clinical trials are still necessary to prove that base therapy can limit chronic kidney disease progression or associated adverse events.
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Affiliation(s)
- Naveen P G Ravikumar
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University, Portland, OR; Veterans Affairs Portland Health Care System, Portland, OR
| | - Alan C Pao
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Stanford, CA; Veterans Affairs Palo Alto Health Care System, Palo Alto, CA
| | - Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University, Portland, OR; Veterans Affairs Portland Health Care System, Portland, OR.
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Azim A, Murray J, Beddhu S, Raphael KL. Urinary Sulfate, Kidney Failure, and Death in CKD: The African American Study of Kidney Disease and Hypertension. Kidney360 2022; 3:1183-1190. [PMID: 35919537 PMCID: PMC9337883 DOI: 10.34067/kid.0000322022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 04/26/2022] [Indexed: 01/11/2023]
Abstract
Background Sulfur is an important mineral element whose principal source is animal protein. Animal protein contributes to the daily acid load, which is associated with poor outcomes in individuals with chronic kidney disease (CKD). We hypothesized that higher urinary sulfate, as a reflection of the daily acid load, is associated with a greater risk of death and CKD progression. Methods Urinary sulfate was measured in 1057 African American Study of Kidney Disease and Hypertension (AASK) participants at baseline. Participants were categorized by tertiles of daily sulfate excretion. The longitudinal outcome of interest was the composite of death, dialysis, or 50% reduction in measured glomerular filtration rate (GFR). Multivariable adjusted Cox regression models were fit to relate the composite outcome to daily sulfate excretion using the lowest tertile as the reference. Results Participants in the highest urinary sulfate tertile were more likely to be men and have a higher body mass index, protein intake, measured GFR, and urinary ammonium and phosphate excretion, and lower urinary protein/creatinine. Compared with those in the lowest tertile of sulfate, those in the highest tertile had a 44% lower hazard (95% CI, 0.37 to 0.84), and those in the middle tertile had a 27% lower hazard (95% CI, 0.55 to 0.96) of death, dialysis, or 50% reduction in measured GFR during follow-up after adjusting for demographics, GFR, protein intake, and other potential confounders. Protein intake was not associated with risk of these events. Conclusions Higher urinary sulfate excretion is associated with more favorable outcomes in Blacks who have CKD attributed to hypertension.
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Affiliation(s)
- Aniqa Azim
- Department of Medicine, Oregon Health and Science University, Portland, Oregon
| | - Jennifer Murray
- The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, New Hampshire
| | - Srinivasan Beddhu
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Kalani L. Raphael
- Department of Medicine, Oregon Health and Science University, Portland, Oregon,Division of Hospital and Specialty Medicine, VA Portland Health Care System, Portland, Oregon
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13
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Gruzdys V, Cahoon K, Pearson L, Raphael KL. Measurement of Urinary Ammonium Using a Commercially Available Plasma Ammonium Assay. Kidney360 2022; 3:926-932. [PMID: 36128493 PMCID: PMC9438425 DOI: 10.34067/kid.0000262022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 02/09/2022] [Indexed: 01/10/2023]
Abstract
Background Determination of urinary ammonium excretion is helpful in evaluating patients with acid-base disorders, chronic kidney disease, and nephrolithiasis. However, urinary ammonium levels are only measured by specialized laboratories in the United States, limiting widespread implementation. We evaluated the performance of a plasma ammonium assay to quantify urinary ammonium excretion and also determined ammonium stability under a variety of conditions. Methods An enzymatic plasma ammonium assay (Randox) was modified to measure urinary ammonium concentration. Urine samples were diluted 40-fold and then assayed on an Abbott Architect ci8200 analyzer. Assay precision, limit of quantitation, and linearity were determined. The method was compared against the formalin titration method, and stability studies were conducted at different temperatures and pH. Results After dilution, the assay had total precision of 18% at 2.54 mmol/L, 5% at 15.58 mmol/L, and 2% at 29.49 mmol/L, with a limit of quantitation of 2.92 mmol/L. Assay performance was linear in the range of 0.7-45 mmol/L. Method comparison against the formalin method showed a slope of 0.98 and intercept of -0.37 mmol/L. Urinary ammonium was determined to be stable for 48 hours at room temperature and for 9 days at 4°C and -20°C at pH 5.6-6.3. Ammonium was less stable at pH 3.8 and 8.5. When stored at -80°C, urinary ammonium was stable for at least 24 months. Conclusions The modified enzymatic plasma ammonium assay reliably quantifies urine ammonium at physiologic concentrations. It compares well with the formalin titration method and is suitable for routine clinical use on an automated chemistry analyzer.
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Affiliation(s)
| | | | - Lauren Pearson
- Department of Pathology, University of Utah School of Medicine, Health Sciences Center, Salt Lake City, Utah
| | - Kalani L. Raphael
- Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University and VA Portland Health Care System, Portland, Oregon
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14
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Wang AA, Cai X, Srivastava A, Prasad PV, Sprague SM, Carr J, Wolf M, Ix JH, Block GA, Chonchol M, Raphael KL, Cheung AK, Raj DS, Gassman JJ, Rahsepar AA, Middleton JP, Fried LF, Sarnari R, Isakova T, Mehta R. Abnormalities in Cardiac Structure and Function among Individuals with CKD: The COMBINE Trial. Kidney360 2021; 3:258-268. [PMID: 35373122 PMCID: PMC8967624 DOI: 10.34067/kid.0005022021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 11/10/2021] [Indexed: 01/10/2023]
Abstract
Background Individuals with CKD have a high burden of cardiovascular disease (CVD). Abnormalities in cardiac structure and function represent subclinical CVD and can be assessed by cardiac magnetic resonance imaging (cMRI). Methods We investigated differences in cMRI parameters in 140 individuals with CKD stages 3b-4 who participated in the CKD Optimal Management with BInders and NicotinamidE (COMBINE) trial and in 24 age- and sex-matched healthy volunteers. Among COMBINE participants, we examined the associations of eGFR, urine albumin-creatinine ratio (UACR), phosphate, fibroblast growth factor 23 (FGF23), and parathyroid hormone (PTH) with baseline (N=140) and 12-month change (N=112) in cMRI parameters. Results Mean (SD) ages of the COMBINE participants and healthy volunteers were 64.9 (11.9) and 60.4 (7.3) years, respectively. The mean (SD) baseline eGFR values in COMBINE participants were 32.1 (8.0) and 85.9 (16.0) ml/min per 1.73 m2 in healthy volunteers. The median (interquartile range [IQR]) UACR in COMBINE participants was 154 (20.3-540.0) mg/g. Individuals with CKD had lower mitral valve E/A ratio compared with healthy volunteers (for CKD versus non-CKD, β estimate, -0.13; 95% CI, -0.24 to -0.012). Among COMBINE participants, multivariable linear regression analyses showed that higher UACR was significantly associated with lower mitral valve E/A ratio (β estimate per 1 unit increase in natural-log UACR, -0.06; 95% CI, -0.09 to -0.03). This finding was preserved among individuals without baseline CVD. UACR was not associated with 12-month change in any cMRI parameter. eGFR, phosphate, FGF23, and PTH were not associated with any cMRI parameter in cross-sectional or change analyses. Conclusions Individuals with CKD stages 3b-4 have evidence of cMRI abnormalities. Albuminuria was independently associated with diastolic dysfunction, as assessed by mitral valve E/A ratio, in individuals with CKD with and without clinical CVD. Albuminuria was not associated with change in any cMRI parameter.
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Affiliation(s)
- Ann A. Wang
- Graduate Medical Education, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Xuan Cai
- Center for Translational Metabolism and Health, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Anand Srivastava
- Center for Translational Metabolism and Health, Feinberg School of Medicine, Northwestern University, Chicago, Illinois,Division of Nephrology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Pottumarthi V. Prasad
- Department of Radiology, NorthShore University Health System Evanston, Evanston, Illinois
| | - Stuart M. Sprague
- Division of Nephrology and Hypertension, NorthShore University Health System, Evanston, Illinois,University of Chicago Pritzker School of Medicine, Chicago, Illinois
| | - James Carr
- Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Myles Wolf
- Division of Nephrology, Department of Medicine, Duke University School of Medicine, Durham, North Carolina,Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
| | - Joachim H. Ix
- Division of Nephrology, Department of Medicine, University of San Diego School of Medicine and Veterans Affairs San Diego Healthcare System, San Diego, California
| | | | - Michel Chonchol
- Division of Renal Disease/Hypertension, Department of Internal Medicine, University of Colorado Hospitals, Aurora, Colorado
| | - Kalani L. Raphael
- Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University and Veterans Affairs Portland Health Care System, Portland, Oregon
| | - Alfred K. Cheung
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Dominic S. Raj
- Division of Kidney Diseases and Hypertension, George Washington University School of Medicine, Washington, DC
| | | | - Amir Ali Rahsepar
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - John P. Middleton
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
| | - Linda F. Fried
- Renal Section, Veterans Affairs Pittsburgh Healthcare System and Department of Medicine, Renal-Electrolyte Division, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Roberto Sarnari
- Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Tamara Isakova
- Center for Translational Metabolism and Health, Feinberg School of Medicine, Northwestern University, Chicago, Illinois,Division of Nephrology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Rupal Mehta
- Center for Translational Metabolism and Health, Feinberg School of Medicine, Northwestern University, Chicago, Illinois,Division of Nephrology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois,Division of Nephrology, Department of Medicine, Jesse Brown Veterans Administration Medical Center, Chicago, Illinois
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15
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Affiliation(s)
- Jeffrey A Kraut
- Medical and Research Services Veterans Administration Greater Los Angeles Healthcare System and Division of Nephrology Veterans Administration Greater Los Angeles Healthcare System, University of California, Los Angeles Membrane Biology Laboratory and University of California, Los Angeles David Geffen School of Medicine Sciences, Los Angeles, California
| | - Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University and Veterans Affairs Portland Health Care System, Portland, Oregon
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16
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Abstract
Metabolic acidosis is fairly common in patients with chronic kidney disease (CKD). The prevalence of metabolic acidosis increases with worsening kidney function and is observed in ∼40% of those with stage 4 CKD. For the past 2 decades, clinical practice guidelines have suggested treatment of metabolic acidosis to counterbalance adverse effects of metabolic acidosis on bone and muscle. Studies in animal models of CKD also demonstrated that metabolic acidosis causes kidney fibrosis. During the past decade, results from observational studies identified associations between metabolic acidosis and adverse kidney outcomes, and results from interventional studies support the hypothesis that treating metabolic acidosis with sodium bicarbonate preserves kidney function. However, convincing data from large-scale, double-blinded, placebo-controlled, randomized trials have been lacking. This review discusses findings from recent interventional trials of alkali therapy in CKD and new findings linking metabolic acidosis with cardiovascular disease in adults and CKD progression in children. Finally, a novel agent that treats metabolic acidosis in patients with CKD by binding hydrochloric acid in the gastrointestinal tract is discussed.
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Affiliation(s)
- Michal L Melamed
- Department of Medicine, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, NY
| | - Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University and Portland VA Medical Center, Portland, OR
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17
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Al-Kindi SG, Brook RD, Bhatt U, Brauer M, Cushman WC, Hanson HA, Kostis J, Lash JP, Paine R, Raphael KL, Rapp S, Tamariz L, Wright JT, Rajagopalan S. The Benefits of Intensive Versus Standard Blood Pressure Treatment According to Fine Particulate Matter Air Pollution Exposure: A Post Hoc Analysis of SPRINT. Hypertension 2021; 77:813-822. [PMID: 33517683 DOI: 10.1161/hypertensionaha.120.15923] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Fine particulate matter <2.5 µm (PM2.5) air pollution is implicated in global mortality, especially from cardiovascular causes. A large body of evidence suggests a link between PM2.5 and elevation in blood pressure (BP), with the latter implicated as a potential mediator of cardiovascular events. We sought to determine if the outcomes of intensive BP lowering (systolic BP <120 mm Hg) on cardiovascular events are modified by PM2.5 exposure in the SPRINT (Systolic BP Intervention Trial). We linked annual PM2.5 exposure estimates derived from an integrated model to subjects participating in SPRINT. We evaluated the effect of intensive BP lowering by PM2.5 exposure on the primary outcome in SPRINT using cox-proportional hazard models. A total of 9286 participants were linked to PM2.5 levels (mean age 68±9 years). Intensive BP-lowering decreased risk of the primary outcome more among patients exposed to higher PM2.5 (Pinteraction=0.047). The estimate for lowering of primary outcome was numerically lower in the highest than in the lower quintiles. The benefits of intensive BP-lowering were larger among patients chronically exposed to PM2.5 levels above US National Ambient Air Quality Standards of 12 µg/m3 (hazard ratio, 0.47 [95% CI, 0.29-0.74]) compared with those living in cleaner locations (hazard ratio, 0.81 [95% CI, 0.68-0.97]), Pinteraction=0.037. This exploratory nonprespecified post hoc analysis of SPRINT suggests that the benefits of intensive BP lowering on the primary outcome was greater in patients exposed to higher PM2.5, suggesting that the magnitude of benefit may depend upon the magnitude of antecedent PM2.5 exposure.
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Affiliation(s)
- Sadeer G Al-Kindi
- From the Department of Medicine, University Hospitals Cleveland Medical Center, Case Western Reserve University, OH (S.G.A.-K., J.T.W., S.R.)
| | - Robert D Brook
- Division of Cardiovascular Medicine, University of Michigan, Ann Arbor (R.D.B.)
| | - Udayan Bhatt
- Department of Medicine, Ohio State University, Columbus (U.B.)
| | - Michael Brauer
- School of Population and Public Health, University of British Columbia, Vancouver, Canada (M.B.)
| | - William C Cushman
- Medical Service, Veterans Affairs Medical Center, Memphis, TN (W.C.C.)
| | - Heidi A Hanson
- Department of Surgery and Huntsman Cancer Institute (H.A.H.), University of Utah, Salt Lake City
| | - John Kostis
- Department of Medicine, Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ (J.K.)
| | - James P Lash
- Department of Medicine, University of Illinois Chicago (J.P.L)
| | - Robert Paine
- Department of Medicine (R.P., K.L.R.), University of Utah, Salt Lake City
| | - Kalani L Raphael
- Department of Medicine (R.P., K.L.R.), University of Utah, Salt Lake City
| | - Stephen Rapp
- Division of Public Health Sciences, Wake Forest University Health Sciences, Winston-Salem, NC (S.R.)
| | - Leonardo Tamariz
- Miami Veterans Affairs Healthcare System, Department of Medicine, University of Miami, FL (L.T.)
| | - Jackson T Wright
- From the Department of Medicine, University Hospitals Cleveland Medical Center, Case Western Reserve University, OH (S.G.A.-K., J.T.W., S.R.)
| | - Sanjay Rajagopalan
- From the Department of Medicine, University Hospitals Cleveland Medical Center, Case Western Reserve University, OH (S.G.A.-K., J.T.W., S.R.)
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18
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Jamshidian MS, Larive B, Gassman J, Raphael KL, Chonchol MB, Ix JH, Ginsberg C. Effect of Lanthanum Carbonate on Blood Pressure in CKD. Am J Kidney Dis 2021; 78:312-314. [PMID: 33428997 DOI: 10.1053/j.ajkd.2020.12.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 12/05/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Mitra S Jamshidian
- Department of Medicine, University of California San Diego, San Diego, CA.
| | - Brett Larive
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH
| | - Jennifer Gassman
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, University of Utah, Salt Lake City, UT
| | - Michel B Chonchol
- Division of Renal Diseases and Hypertension, University of Anschutz Medical Center, Aurora, CO
| | - Joachim H Ix
- Division of Nephrology-Hypertension, University of California San Diego, San Diego, CA; Nephrology Section, Veterans Affairs San Diego Healthcare System, La Jolla, CA
| | - Charles Ginsberg
- Division of Nephrology-Hypertension, University of California San Diego, San Diego, CA
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19
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Aitaoto N, Raphael KL. Haemodialysis in Samoa: A model for other Pacific nations. Lancet Reg Health West Pac 2021; 6:100071. [PMID: 34327405 PMCID: PMC8315320 DOI: 10.1016/j.lanwpc.2020.100071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 11/25/2020] [Indexed: 12/17/2022]
Affiliation(s)
- Nia Aitaoto
- Pacific Islander Center of Primary Care Excellence, and Department of Nutrition and Integrative Physiology, College of Health, University of Utah, Salt Lake City, UT, USA
| | - Kalani L. Raphael
- Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University and VA Portland Health Care System, 3181 SW Sam Jackson Park Rd., Mail Code: SJH6, Portland, OR 97239, USA
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20
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Dobre M, Pajewski NM, Beddhu S, Chonchol M, Hostetter TH, Li P, Rahman M, Servilla K, Weiner DE, Wright JT, Raphael KL. Serum bicarbonate and cardiovascular events in hypertensive adults: results from the Systolic Blood Pressure Intervention Trial. Nephrol Dial Transplant 2020; 35:1377-1384. [PMID: 32163578 DOI: 10.1093/ndt/gfz149] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 06/21/2019] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Low serum bicarbonate level is associated with increased mortality, but its role as a predictor of cardiovascular disease (CVD) is unclear. This study evaluates the association between serum bicarbonate concentration and CVD and whether the effect of intensive blood pressure (BP) lowering on CVD outcomes is modified by serum bicarbonate level. METHODS The Systolic Blood Pressure Intervention Trial (SPRINT) randomized participants to a systolic BP target <120 mmHg (intensive treatment) or <140 mmHg (standard treatment). The primary CVD outcome was a composite of nonfatal myocardial infarction (MI), acute coronary syndrome not resulting in MI, stroke, acute decompensated heart failure and CVD death. Cox proportional hazards models adjusted for demographic, clinical and laboratory characteristics were used to evaluate the association of interest in 9334 SPRINT participants (ClinicalTrials.gov: NCT01206062). RESULTS Over a median follow-up of 3.33 years (interquartile range 2.87-3.87 years), 618 (6.6%) participants experienced a primary CVD outcome. Participants with serum bicarbonate <22 mEq/L had a significantly higher risk of the primary CVD outcome (hazard ratio 1.54; 95% confidence interval 1.11-2.14, P = 0.01), compared with participants with bicarbonate 22-26 mEq/L. The magnitude of the CVD risk reduction with intensive BP lowering was similar across bicarbonate strata (P-value for interaction = 0.97). CONCLUSIONS In hypertensive individuals, serum bicarbonate level <22 mEq/L was associated with an increased CVD risk. The effect of intensive BP lowering on CVD outcomes was not modified by the serum bicarbonate level.
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Affiliation(s)
- Mirela Dobre
- Division of Nephrology and Hypertension, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA
| | - Nicholas M Pajewski
- Biostatistics and Data Science, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Srinivasan Beddhu
- Veterans Affairs Salt Lake City Healthcare System, University of Utah Health, Salt Lake City, UT, USA
| | - Michel Chonchol
- Renal Diseases and Hypertension, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Thomas H Hostetter
- Division of Nephrology and Hypertension, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA
| | - Ping Li
- VA Medical Center, George Washington University, Washington, DC, USA
| | - Mahboob Rahman
- Division of Nephrology and Hypertension, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA.,Division of Nephrology, Louis Stokes Cleveland VA Medical Center, Cleveland, OH, USA
| | - Karen Servilla
- Nephrology, New Mexico VA Health Care System, Albuquerque, NM, USA
| | | | - Jackson T Wright
- Division of Nephrology and Hypertension, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA
| | - Kalani L Raphael
- Veterans Affairs Salt Lake City Healthcare System, University of Utah Health, Salt Lake City, UT, USA
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21
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Malhotra R, Katz R, Jotwani V, Agarwal A, Cohen DL, Cushman WC, Ishani A, Killeen AA, Kitzman DW, Oparil S, Papademetriou V, Parikh CR, Raphael KL, Rocco MV, Tamariz LJ, Whelton PK, Wright JT, Shlipak MG, Ix JH. Estimated GFR Variability and Risk of Cardiovascular Events and Mortality in SPRINT (Systolic Blood Pressure Intervention Trial). Am J Kidney Dis 2020; 78:48-56. [PMID: 33333147 DOI: 10.1053/j.ajkd.2020.10.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 10/16/2020] [Indexed: 11/11/2022]
Abstract
RATIONALE AND OBJECTIVE Although low estimated glomerular filtration rate (eGFR) is associated with cardiovascular disease (CVD) events and mortality, the clinical significance of variability in eGFR over time is uncertain. This study aimed to evaluate the associations between variability in eGFR and the risk of CVD events and all-cause mortality. STUDY DESIGN Longitudinal analysis of clinical trial participants. SETTINGS AND PARTICIPANTS 7,520 Systolic Blood Pressure Intervention Trial (SPRINT) participants ≥50 year of age with 1 or more CVD risk factors. PREDICTORS eGFR variability, estimated by the coefficient of variation of eGFR assessments at the 6th, 12th, and 18-month study visits. OUTCOMES The SPRINT primary CVD composite outcome (myocardial infarction, acute coronary syndrome, stroke, heart failure, or CVD death) and all-cause mortality from month 18 to the end of follow-up. ANALYTICAL APPROACH Cox models were used to evaluate associations between eGFR variability and CVD outcomes and all-cause mortality. Models were adjusted for demographics, randomization arm, CVD risk factors, albuminuria, and eGFR at month 18. RESULTS Mean age was 68 ± 9 years; 65% were men; and 58% were White. The mean eGFR was 73 ± 21 (SD) mL/min/1.73 m2 at 6 months. There were 370 CVD events and 154 deaths during a median follow-up of 2.4 years. Greater eGFR variability was associated with higher risk for all-cause mortality (hazard ratio [HR] per 1 SD greater variability, 1.29; 95% CI, 1.14-1.45) but not CVD events (HR, 1.05; 95% CI, 0.95-1.16) after adjusting for albuminuria, eGFR, and other CVD risk factors. Associations were similar when stratified by treatment arm and by baseline CKD status, when accounting for concurrent systolic blood pressure changes, use of angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, and diuretic medications during follow up. LIMITATIONS Persons with diabetes and proteinuria > 1 g/d were excluded. CONCLUSIONS In trial participants at high risk for CVD, greater eGFR variability was independently associated with all-cause mortality but not CVD events.
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Affiliation(s)
- Rakesh Malhotra
- Division of Nephrology and Hypertension, Department of Medicine, University of California San Diego, San Diego, CA
| | - Ronit Katz
- Kidney Research Institute, University of Washington, Seattle, WA
| | - Vasantha Jotwani
- Kidney Health Research Collaborative, San Francisco Veterans Affairs Medical Center and University of California, San Francisco, CA
| | - Adhish Agarwal
- Division of Nephrology and Hypertension, Department of Medicine, University of Utah Health, Salt Lake City, UT
| | - Debbie L Cohen
- Renal-Electrolyte and Hypertension Division, Department of Medicine, University of Pennsylvania, Philadelphia, PA
| | - William C Cushman
- Medical Service, Veteran Affairs Medical Center and Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, TN
| | - Areef Ishani
- Division of Nephrology, Department of Medicine, University of Minnesota and Veteran Affairs Medical Center, Minneapolis, MN
| | - Anthony A Killeen
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - Dalane W Kitzman
- Division of Cardiovascular Medicine, Wake Forest School of Medicine, Winston Salem, NC
| | - Suzanne Oparil
- Vascular Biology and Hypertension Program, Division of Cardiovascular Disease, Department of Medicine, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL
| | - Vasilios Papademetriou
- Division of Cardiology, Department of Medicine, Georgetown University and Veteran Affairs Medical Center, Washington, DC
| | - Chirag R Parikh
- Division of Nephrology, Department of Medicine, John Hopkins University, Baltimore, MD
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, Department of Medicine, University of Utah Health, Salt Lake City, UT
| | - Michael V Rocco
- Division of Nephrology, Department of Medicine, Wake Forest School of Medicine, Winston Salem, NC
| | - Leonardo J Tamariz
- Department of Medicine, Miller School of Medicine at the University of Miami, Miami, FL
| | - Paul K Whelton
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA
| | - Jackson T Wright
- Division of Nephrology and Hypertension, University Hospital Cleveland Medical Center, Cleveland, OH
| | - Michael G Shlipak
- Kidney Health Research Collaborative, San Francisco Veterans Affairs Medical Center and University of California, San Francisco, CA; Division of General Internal Medicine, San Francisco Veterans Affairs Medical Center, San Francisco, CA
| | - Joachim H Ix
- Division of Preventive Medicine, Department of Family Medicine and Public Health, University of California San Diego, San Diego, CA; Nephrology Section, Veterans Affairs San Diego Healthcare System, La Jolla, CA.
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22
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Raphael KL, Kraut JA. Assessing Acid-Base Status in Patients With CKD: Does Measurement of Blood pH Matter? Am J Kidney Dis 2020; 77:9-11. [PMID: 33067031 DOI: 10.1053/j.ajkd.2020.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University; VA Portland Health Care System, Portland, OR.
| | - Jeffrey A Kraut
- Medical and Research Services, VHAGLA Healthcare System, Los Angeles, CA; Division of Nephrology, VHAGLA Healthcare System, Los Angeles, CA; UCLA Membrane Biology Laboratory, Los Angeles, CA; UCLA David Geffen School of Medicine Sciences, Los Angeles, CA
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23
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Xiang J, Morgenstern H, Li Y, Steffick D, Bragg-Gresham J, Panapasa S, Raphael KL, Robinson BM, Herman WH, Saran R. Incidence of ESKD Among Native Hawaiians and Pacific Islanders Living in the 50 US States and Pacific Island Territories. Am J Kidney Dis 2020; 76:340-349.e1. [DOI: 10.1053/j.ajkd.2020.01.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 01/12/2020] [Indexed: 11/11/2022]
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24
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Raphael KL. The Dietary Approaches to Stop Hypertension (DASH) diet in chronic kidney disease: should we embrace it? Kidney Int 2020; 95:1296-1298. [PMID: 31122706 DOI: 10.1016/j.kint.2019.01.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 01/29/2019] [Indexed: 01/16/2023]
Abstract
The Dietary Approaches to Stop Hypertension (DASH) diet lowers blood pressure and cardiovascular disease risk. In this issue, Banerjee et al. report that the DASH diet is associated with lower risk of end-stage kidney disease in individuals with stage 3 chronic kidney disease and hypertension. This association was particulary strong among those with diabetes. The DASH diet may have an important role in preventing end-stage kidney disease in select individuals with chronic kidney disease.
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Affiliation(s)
- Kalani L Raphael
- Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, Utah, USA; Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah, USA.
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25
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Ginsberg C, Katz R, Chonchol MB, Bullen AL, Raphael KL, Zhang WR, Ambrosius WT, Bates JT, Neyra JA, Killeen AA, Punzi H, Shlipak MG, Ix JH. The Effects of Intensive Blood Pressure Lowering on Markers of Mineral Metabolism in Persons with CKD in SPRINT. Clin J Am Soc Nephrol 2020; 15:852-854. [PMID: 32376678 PMCID: PMC7274286 DOI: 10.2215/cjn.01400220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Charles Ginsberg
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California .,Division of Nephrology-Hypertension, University of California, San Diego, California
| | - Ronit Katz
- Kidney Research Institute, University of Washington, Seattle, Washington
| | - Michel B Chonchol
- Division of Renal Diseases and Hypertension, University of Anschutz Medical Center, Aurora, Colorado
| | - Alexander L Bullen
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California.,Division of Nephrology-Hypertension, University of California, San Diego, California
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah
| | - William R Zhang
- Kidney Health Research Collaborative, Veterans Affairs Medical Center, San Francisco, California.,Department of Dermatology, University of California, San Francisco, California
| | - Walter T Ambrosius
- Division of Public Health Sciences, Department of Biostatistics and Data Science, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Jeffrey T Bates
- Department of Medicine, Michael E. DeBakey Veterans Affairs Medical Center and Baylor College of Medicine, Houston, Texas
| | - Javier A Neyra
- Division of Nephrology, Bone and Mineral Metabolism, Department of Internal Medicine, University of Kentucky, Lexington, Kentucky
| | - Anthony A Killeen
- Division of Nephrology, Department of Medicine, Tufts Medical Center, Boston, Massachusetts
| | | | - Michael G Shlipak
- Kidney Health Research Collaborative, Veterans Affairs Medical Center, San Francisco, California.,Department of Medicine, University of California, San Francisco, California
| | - Joachim H Ix
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California.,Division of Nephrology-Hypertension, University of California, San Diego, California
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Gardner J, Tuttle K, Raphael KL. Influence of Medications Containing Acid Salts on Serum Bicarbonate in CKD. Kidney360 2020; 1:330-336. [PMID: 35369374 PMCID: PMC8809288 DOI: 10.34067/kid.0000532019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 03/18/2020] [Indexed: 06/14/2023]
Abstract
BACKGROUND Many medications are formulated with acid salts. Their effect on acid-base balance in CKD is unclear. METHODS We calculated the acid load (meq/d) from medications prescribed to 74 United States veterans with diabetes and CKD to identify agents with high potential acid load. We also determined cross-sectional associations between the acid load from medications and acid-base parameters after adjusting for demographics, eGFR, protein intake, and other confounders. RESULTS Of the 125 medications prescribed, 31 (25%) contained an acid salt. Metformin hydrochloride (15.4 meq/d at 2550 mg/d) and gabapentin hydrochloride (13.0 meq/d at 2700 mg/d) were identified as agents with a high potential acid load. Mean daily acid load from medications was 6.6 meq/d in the overall cohort, 14.2 meq/d in the high medication acid load group (≥7.7 meq/d, n=29), and 1.6 meq/d in the low medication acid load group (<7.7 meq/d, n=45). After adjusting for potential confounders, those in the high acid load group had 1.7 meq/L lower total carbon dioxide (CO2) and 2.2 meq/L higher anion gap than those in the low acid load group. Use of gabapentin alone was not associated with differences in total CO2 or anion gap. Use of metformin alone was associated with 0.7 meq/L lower total CO2 and 1.0 meq/L higher anion gap. Use of metformin with gabapentin was associated with 1.8 meq/L lower total CO2 and 2.4 meq/L higher anion gap. The higher anion gap was not explained by higher serum lactate levels. The acid load from medications was not associated with differences in urinary ammonium, titratable acid, or pH. CONCLUSIONS Medications containing acid salts, particularly metformin hydrochloride and gabapentin hydrochloride, are sources of an exogenous acid load. These agents may influence serum total CO2 levels and serum anion gap in individuals with CKD. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER Investigations of the Optimum Serum Bicarbonate Level in Renal Disease, NCT01574157.
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Affiliation(s)
- John Gardner
- Pharmacy Section, Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, Utah
| | - Kunani Tuttle
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Kalani L. Raphael
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
- Medicine Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
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27
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Srivastava A, Cai X, Lee J, Li W, Larive B, Kendrick C, Gassman JJ, Middleton JP, Carr J, Raphael KL, Cheung AK, Raj DS, Chonchol MB, Fried LF, Block GA, Sprague SM, Wolf M, Ix JH, Prasad PV, Isakova T. Kidney Functional Magnetic Resonance Imaging and Change in eGFR in Individuals with CKD. Clin J Am Soc Nephrol 2020; 15:776-783. [PMID: 32345747 PMCID: PMC7274274 DOI: 10.2215/cjn.13201019] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 03/31/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND OBJECTIVES Kidney functional magnetic resonance imaging (MRI) requires further investigation to enhance the noninvasive identification of patients at high risk of CKD progression. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS In this exploratory study, we obtained baseline diffusion-weighted and blood oxygen level-dependent MRI in 122 participants of the CKD Optimal Management with Binders and Nicotinamide trial, which was a multicenter, randomized, double-blinded, 12-month, four-group parallel trial of nicotinamide and lanthanum carbonate versus placebo conducted in individuals with eGFR 20-45 ml/min per 1.73 m2. Lower values of apparent diffusion coefficient (ADC) on diffusion-weighted MRI may indicate increased fibrosis, and higher values of relaxation rate (R2*) on blood oxygen level-dependent MRI may represent decreased oxygenation. Because there was no effect of active treatment on eGFR over 12 months, we tested whether baseline kidney functional MRI biomarkers were associated with eGFR decline in all 122 participants. In a subset of 87 participants with 12-month follow-up MRI data, we evaluated whether kidney functional MRI biomarkers change over time. RESULTS Mean baseline eGFR was 32±9 ml/min per 1.73 m2, and mean annual eGFR slope was -2.3 (95% confidence interval [95% CI], -3.4 to -1.1) ml/min per 1.73 m2 per year. After adjustment for baseline covariates, baseline ADC was associated with change in eGFR over time (difference in annual eGFR slope per 1 SD increase in ADC: 1.3 [95% CI, 0.1 to 2.5] ml/min per 1.73 m2 per year, ADC×time interaction P=0.04). This association was no longer significant after further adjustment for albuminuria (difference in annual eGFR slope per 1 SD increase in ADC: 1.0 (95% CI, -0.1 to 2.2) ml/min per 1.73 m2 per year, ADC×time interaction P=0.08). There was no significant association between baseline R2* and change in eGFR over time. In 87 participants with follow-up functional MRI, ADC and R2* values remained stable over 12 months (intraclass correlation: 0.71 and 0.68, respectively). CONCLUSIONS Baseline cortical ADC was associated with change in eGFR over time, but this association was not independent of albuminuria. Kidney functional MRI biomarkers remained stable over 1 year. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER CKD Optimal Management with Binders and Nicotinamide (COMBINE), NCT02258074.
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Affiliation(s)
- Anand Srivastava
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Xuan Cai
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Jungwha Lee
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Wei Li
- Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois
| | - Brett Larive
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Cynthia Kendrick
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Jennifer J Gassman
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - John P Middleton
- Department of Medicine, Division of Nephrology, Duke University School of Medicine, Durham, North Carolina
| | - James Carr
- Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah.,Salt Lake City Veterans Affairs Healthcare System, Salt Lake City, Utah
| | - Alfred K Cheung
- Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah.,Salt Lake City Veterans Affairs Healthcare System, Salt Lake City, Utah
| | - Dominic S Raj
- Division of Renal Diseases and Hypertension, George Washington University School of Medicine and Health Sciences, Washington, DC
| | - Michel B Chonchol
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Linda F Fried
- Division of Nephrology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.,Renal Section, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
| | | | - Stuart M Sprague
- Department of Medicine, NorthShore University HealthSystem, Evanston, Illinois
| | - Myles Wolf
- Department of Medicine, Division of Nephrology, Duke University School of Medicine, Durham, North Carolina
| | - Joachim H Ix
- Department of Medicine, Renal Section, University of San Diego, Veterans Affairs San Diego Healthcare System, San Diego, California
| | | | - Tamara Isakova
- Division of Nephrology and Hypertension, Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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28
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Malhotra R, Katz R, Jotwani V, Ambrosius WT, Raphael KL, Haley W, Rastogi A, Cheung AK, Freedman BI, Punzi H, Rocco MV, Ix JH, Shlipak MG. Urine Markers of Kidney Tubule Cell Injury and Kidney Function Decline in SPRINT Trial Participants with CKD. Clin J Am Soc Nephrol 2020; 15:349-358. [PMID: 32111704 PMCID: PMC7057300 DOI: 10.2215/cjn.02780319] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 01/17/2020] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES eGFR and albuminuria primarily reflect glomerular function and injury, whereas tubule cell atrophy and interstitial fibrosis on kidney biopsy are important risk markers for CKD progression. Kidney tubule injury markers have primarily been studied in hospitalized AKI. Here, we examined the association between urinary kidney tubule injury markers at baseline with subsequent loss of kidney function in persons with nondiabetic CKD who participated in the Systolic Blood Pressure Intervention Trial (SPRINT). DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Among 2428 SPRINT participants with CKD (eGFR<60 ml/min per 1.73 m2) at baseline, we measured urine markers of tubule injury (IL-18, kidney injury molecule-1 [KIM-1], neutrophil gelatinase-associated lipocalin [NGAL]), inflammation (monocyte chemoattractant protein-1 [MCP-1]), and repair (human cartilage glycoprotein-40 [YKL-40]). Cox proportional hazards models evaluated associations of these markers with the kidney composite outcome of 50% eGFR decline or ESKD requiring dialysis or kidney transplantation, and linear mixed models evaluated annualized change in eGFR. RESULTS Mean participant age was 73±9 (SD) years, 60% were men, 66% were white, and mean baseline eGFR was 46±11 ml/min per 1.73 m2. There were 87 kidney composite outcome events during a median follow-up of 3.8 years. Relative to the respective lowest quartiles, the highest quartiles of urinary KIM-1 (hazard ratio, 2.84; 95% confidence interval [95% CI], 1.31 to 6.17), MCP-1 (hazard ratio, 2.43; 95% CI, 1.13 to 5.23), and YKL-40 (hazard ratio, 1.95; 95% CI, 1.08 to 3.51) were associated with higher risk of the kidney composite outcome in fully adjusted models including baseline eGFR and urine albumin. In linear analysis, urinary IL-18 was the only marker associated with eGFR decline (-0.91 ml/min per 1.73 m2 per year for highest versus lowest quartile; 95% CI, -1.44 to -0.38), a finding that was stronger in the standard arm of SPRINT. CONCLUSIONS Urine markers of tubule cell injury provide information about risk of subsequent loss of kidney function, beyond the eGFR and urine albumin.
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Affiliation(s)
- Rakesh Malhotra
- Division of Nephrology and Hypertension, Department of Medicine and.,Division of Nephrology and Hypertension, Imperial Valley Family Care Medical Group, El Centro, California
| | - Ronit Katz
- Kidney Research Institute, University of Washington, Seattle, Washington
| | - Vasantha Jotwani
- Kidney Health Research Collaborative, San Francisco Veterans Affairs Medical Center and University of California, San Francisco, California
| | - Walter T Ambrosius
- Department of Biostatistics and Data Science, Division of Public Health Sciences and
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, University of Utah Health and Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
| | - William Haley
- Division of Nephrology, Mayo Clinic, Jacksonville, Florida
| | - Anjay Rastogi
- Division of Nephrology, University of California Los Angeles, Los Angeles, California
| | - Alfred K Cheung
- Division of Nephrology and Hypertension, University of Utah Health and Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
| | - Barry I Freedman
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Henry Punzi
- Trinity Hypertension and Metabolic Research Instititute, Punzi Medical Center, Carrollton, Texas
| | - Michael V Rocco
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Joachim H Ix
- Division of Nephrology and Hypertension, Department of Medicine and .,Division of Preventive Medicine, Department of Family Medicine and Public Health, University of California San Diego, San Diego, California.,Nephrology Section, Veterans Affairs San Diego Healthcare System, La Jolla, California; and
| | - Michael G Shlipak
- Kidney Health Research Collaborative, San Francisco Veterans Affairs Medical Center and University of California, San Francisco, California.,Division of General Internal Medicine, San Francisco Veterans Affairs Medical Center, San Francisco, California
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29
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Raphael KL, Greene T, Wei G, Bullshoe T, Tuttle K, Cheung AK, Beddhu S. Sodium Bicarbonate Supplementation and Urinary TGF- β1 in Nonacidotic Diabetic Kidney Disease: A Randomized, Controlled Trial. Clin J Am Soc Nephrol 2020; 15:200-208. [PMID: 31974286 PMCID: PMC7015087 DOI: 10.2215/cjn.06600619] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 12/10/2019] [Indexed: 01/09/2023]
Abstract
BACKGROUND AND OBJECTIVES In early-phase studies of individuals with hypertensive CKD and normal serum total CO2, sodium bicarbonate reduced urinary TGF-β1 levels and preserved kidney function. The effect of sodium bicarbonate on kidney fibrosis and injury markers in individuals with diabetic kidney disease and normal serum total CO2 is unknown. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We conducted a randomized, double-blinded, placebo-controlled study in 74 United States veterans with type 1 or 2 diabetes mellitus, eGFR of 15-89 ml/min per 1.73 m2, urinary albumin-to-creatinine ratio (UACR) ≥30 mg/g, and serum total CO2 of 22-28 meq/L. Participants received oral sodium bicarbonate (0.5 meq/kg lean body wt per day; n=35) or placebo (n=39) for 6 months. The primary outcome was change in urinary TGF-β1-to-creatinine from baseline to months 3 and 6. Secondary outcomes included changes in urinary kidney injury molecule-1 (KIM-1)-to-creatinine, fibronectin-to-creatinine, neutrophil gelatinase-associated lipocalin (NGAL)-to-creatinine, and UACR from baseline to months 3 and 6. RESULTS Key baseline characteristics were age 72±8 years, eGFR of 51±18 ml/min per 1.73 m2, and serum total CO2 of 24±2 meq/L. Sodium bicarbonate treatment increased mean total CO2 by 1.2 (95% confidence interval [95% CI], 0.3 to 2.1) meq/L, increased urinary pH by 0.6 (95% CI, 0.5 to 0.8), and decreased urinary ammonium excretion by 5 (95% CI, 0 to 11) meq/d and urinary titratable acid excretion by 11 (95% CI, 5 to 18) meq/d. Sodium bicarbonate did not significantly change urinary TGF-β1/creatinine (difference in change, 13%, 95% CI, -10% to 40%; change within the sodium bicarbonate group, 8%, 95% CI, -10% to 28%; change within the placebo group, -4%, 95% CI, -19% to 13%). Similarly, no significant effect on KIM-1-to-creatinine (difference in change, -10%, 95% CI, -38% to 31%), fibronectin-to-creatinine (8%, 95% CI, -15% to 37%), NGAL-to-creatinine (-33%, 95% CI, -56% to 4%), or UACR (1%, 95% CI, -25% to 36%) was observed. CONCLUSIONS In nonacidotic diabetic kidney disease, sodium bicarbonate did not significantly reduce urinary TGF-β1, KIM-1, fibronectin, NGAL, or UACR over 6 months.
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Affiliation(s)
- Kalani L Raphael
- Medicine Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah; and .,Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Tom Greene
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Guo Wei
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Tristin Bullshoe
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Kunani Tuttle
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Alfred K Cheung
- Medicine Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah; and.,Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Srinivasan Beddhu
- Medicine Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah; and.,Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
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30
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Raphael KL, Isakova T, Ix JH, Raj DS, Wolf M, Fried LF, Gassman JJ, Kendrick C, Larive B, Flessner MF, Mendley SR, Hostetter TH, Block GA, Li P, Middleton JP, Sprague SM, Wesson DE, Cheung AK. A Randomized Trial Comparing the Safety, Adherence, and Pharmacodynamics Profiles of Two Doses of Sodium Bicarbonate in CKD: the BASE Pilot Trial. J Am Soc Nephrol 2019; 31:161-174. [PMID: 31848294 DOI: 10.1681/asn.2019030287] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 09/06/2019] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Oral sodium bicarbonate (NaHCO3) may preserve kidney function in CKD, even if initiated when serum bicarbonate concentration is normal. Adequately powered trials testing this hypothesis have not been conducted, partly because the best dose for testing is unknown. METHODS This multicenter pilot trial assessed the safety, tolerability, adherence, and pharmacodynamics of two doses of NaHCO3 over 28 weeks in adults with eGFR 20-44 or 45-59 ml/min per 1.73 m2 with urinary albumin/creatinine (ACR) ≥50 mg/g and serum bicarbonate 20-28 meq/L. We randomly assigned 194 participants from ten clinical sites to receive higher-dose (HD-NaHCO3; 0.8 meq/kg of lean body wt per day; n=90) or lower-dose (LD-NaHCO3; 0.5 meq/kg of lean body wt per day; n=52) NaHCO3 or matching placebo (n=52). The dose was adjusted depending on side effects. The prescribed dose at week 28 was the primary outcome; a dose was considered acceptable for a full-scale trial if ≥67% of participants were on full-dose and ≥80% were on ≥25% of the per-protocol dose. RESULTS Mean±SD baseline eGFR was 36±9 ml/min per 1.73 m2, serum bicarbonate was 24±2 meq/L, and median (IQR) ACR was 181 (25-745) mg/g. Both doses were well tolerated without significant changes in BP, weight, or serum potassium. The proportions of adverse events and hospitalizations were similar across the groups. Consequently, 87% in HD-NaHCO3, 96% in LD-NaHCO3, and 87% in placebo were on full dose at week 28; and 91% in HD-NaHCO3, 98% in LD-NaHCO3, and 92% in placebo were on ≥25% of the per-protocol dose. Mean urinary ammonium excretion was 25% lower and serum bicarbonate concentration was 1.3 meq/L higher in HD-NaHCO3 compared with LD-NaHCO3 at week 28. However, mean ACR increased by 12% in the lower-dose group and 30% in the higher-dose group. CONCLUSIONS Both NaHCO3 doses were well tolerated over 28 weeks with no significant difference in adverse events or hospitalization compared with placebo. The higher dose lowered urinary ammonium excretion and increased serum bicarbonate more than the lower dose but was associated with a greater increase in ACR. The higher 0.8 meq/kg of lean body wt per day dose of NaHCO3 may be a reasonable choice for future trials.
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Affiliation(s)
- Kalani L Raphael
- Department of Internal Medicine, University of Utah Health and Renal Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah;
| | - Tamara Isakova
- Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Joachim H Ix
- Department of Medicine, University of California San Diego and Renal Section, Veterans Affairs San Diego Healthcare System, San Diego, California
| | - Dominic S Raj
- Division of Renal Diseases and Hypertension, Department of Medicine, George Washington University School of Medicine, Washington, DC
| | - Myles Wolf
- Division of Nephrology, Department of Medicine, Duke Clinical Research Institute, Duke University, Durham, North Carolina
| | - Linda F Fried
- Department of Medicine, University of Pittsburgh and Renal Section, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, Pennsylvania
| | - Jennifer J Gassman
- Department of Quantitative Health Sciences, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Cynthia Kendrick
- Department of Quantitative Health Sciences, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Brett Larive
- Department of Quantitative Health Sciences, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Michael F Flessner
- Division of Kidney, Urologic, and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Susan R Mendley
- Division of Kidney, Urologic, and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | | | | | - Ping Li
- Renal Section, Veterans Affairs Washington, DC Health Care System, Washington, DC
| | - John P Middleton
- Division of Nephrology, Department of Medicine, Duke Clinical Research Institute, Duke University, Durham, North Carolina
| | - Stuart M Sprague
- Department of Medicine, Northshore University Health System, University of Chicago, Evanston, Illinois; and
| | - Donald E Wesson
- Health and Wellness Center, Baylor Scott & White Health, Dallas, Texas
| | - Alfred K Cheung
- Department of Internal Medicine, University of Utah Health and Renal Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
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31
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Di Iorio BR, Bellasi A, Raphael KL, Santoro D, Aucella F, Garofano L, Ceccarelli M, Di Lullo L, Capolongo G, Di Iorio M, Guastaferro P, Capasso G. Treatment of metabolic acidosis with sodium bicarbonate delays progression of chronic kidney disease: the UBI Study. J Nephrol 2019; 32:989-1001. [PMID: 31598912 PMCID: PMC6821658 DOI: 10.1007/s40620-019-00656-5] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 09/28/2019] [Indexed: 11/27/2022]
Abstract
Background Metabolic acidosis is associated with accelerated progression of chronic kidney disease (CKD). Whether treatment of metabolic acidosis with sodium bicarbonate improves kidney and patient survival in CKD is unclear. Methods We conducted a randomized (ratio 1:1). open-label, controlled trial (NCT number: NCT01640119. www.clinicaltrials.gov) to determine the effect in patients with CKD stage 3–5 of treatment of metabolic acidosis with sodium bicarbonate (SB) on creatinine doubling (primary endpoint), all-cause mortality and time to renal replacement therapy compared to standard care (SC) over 36-months. Parametric, non-parametric tests and survival analyses were used to assess the effect of SB on these outcomes. Results A total of 376 and 364 individuals with mean (SD) age 67.8 (14.9) years, creatinine clearance 30 (12) ml/min, and serum bicarbonate 21.5 (2.4) mmol/l were enrolled in SB and SC, respectively. Mean (SD) follow-up was 29.6 (9.8) vs 30.3 (10.7) months in SC and SB. respectively. The mean (SD) daily doses of SB was 1.13 (0.10). 1.12 (0.11). and 1.09 (0.12) mmol/kg*bw/day in the first, second and third year of follow-up, respectively. A total of 87 participants reached the primary endpoint [62 (17.0%) in SC vs 25 (6.6%) in SB, p < 0.001). Similarly, 71 participants [45 (12.3%) in SC and 26 (6.9%) in SB, p = 0.016] started dialysis while 37 participants [25 (6.8%) in SC and 12 (3.1%) in SB, p = 0.004] died. There were no significant effect of SB on blood pressure, total body weight or hospitalizations. Conclusion In persons with CKD 3–5 without advanced stages of chronic heart failure, treatment of metabolic acidosis with sodium bicarbonate is safe and improves kidney and patient survival. Electronic supplementary material The online version of this article (10.1007/s40620-019-00656-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Biagio R Di Iorio
- Nephrology and Dialysis Unit, PO "A. Landolfi", Solofra, Avellino, Italy.
- Nephrology and Dialysis, "Antonio Cardarelli" hospital, Naples, Italia.
| | - Antonio Bellasi
- Department of Research, Innovation, Brand Reputation, Bergamo Hospital, ASST Papa Giovanni XXIII, Bergamo, Italy
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah Health, Salt Lake City, UT, USA
| | - Domenico Santoro
- Dialysis and Nephrology Unit, University of Messina, Messina, Italy
| | - Filippo Aucella
- Department of Nephrology and Dialysis, IRCCS "Casa Sollievo della Sofferenza", San Giovanni Rotondo, Foggia, Italy
| | - Luciano Garofano
- Biogem, Section of Genetic and Translational Medicine, Ariano Irpino, Avellino, Italy
| | - Michele Ceccarelli
- Biogem, Section of Genetic and Translational Medicine, Ariano Irpino, Avellino, Italy
- Department of Science and Technology, University of Sannio, Benevento, Italy
| | - Luca Di Lullo
- Department of Nephrology and Dialysis, "L. Parodi-Delfino" Hospital, Colleferro, Roma, Italy
| | - Giovanna Capolongo
- Department of Translational Medical Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Mattia Di Iorio
- Data Scientist, Landolfi Nephrology Dialysis Consultant, Solofra, Avellino, Italy
| | - Pasquale Guastaferro
- Department of Nephrology, "G. Criscuoli" Hospital, Sant'Angelo dei Lombardi, Avellino, Italia
| | - Giovambattista Capasso
- Department of Nephrology and Dialysis, IRCCS "Casa Sollievo della Sofferenza", San Giovanni Rotondo, Foggia, Italy
- Department of Translational Medical Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy
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32
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Lee AK, Katz R, Jotwani V, Garimella PS, Ambrosius WT, Cheung AK, Gren LH, Neyra JA, Punzi H, Raphael KL, Shlipak MG, Ix JH. Distinct Dimensions of Kidney Health and Risk of Cardiovascular Disease, Heart Failure, and Mortality. Hypertension 2019; 74:872-879. [PMID: 31378102 PMCID: PMC6739187 DOI: 10.1161/hypertensionaha.119.13339] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Chronic kidney disease is a strong risk factor for cardiovascular disease (CVD), but clinical kidney measures (estimated glomerular filtration rate and albuminuria) do not fully reflect the multiple aspects of kidney tubules influencing cardiovascular health. Applied methods are needed to integrate numerous tubule biomarkers into useful prognostic scores. In SPRINT (Systolic Blood Pressure Intervention Trial) participants with chronic kidney disease at baseline (estimated glomerular filtration ratecr&cys <60 mL/minute per 1.73 m2), we measured 8 biomarkers from urine (α1M [α1M microglobulin], β2M [β2M microglobulin], umod [uromodulin], KIM-1 [kidney injury molecule-1], MCP-1 [monocyte chemoattractant protein-1], YKL-40 [chitinase-3-like protein-1], NGAL [neutrophil gelatinase-associated lipocalin], and IL-18 [interleukin 18]) and 2 biomarkers from serum (intact parathyroid hormone, iFGF-23 [intact fibroblast growth factor-23]). We used an unsupervised method, exploratory factor analysis, to create summary scores of tubule health dimensions. Adjusted Cox models evaluated each tubule score with CVD events, heart failure, and all-cause mortality. We examined CVD discrimination using Harrell C-statistic. Factor analysis of 10 biomarkers from 2376 SPRINT-chronic kidney disease participants identified 4 unique dimensions of tubular health: tubule injury/repair (NGAL, IL-18, YKL-40), tubule injury/fibrosis (KIM-1, MCP-1), tubule reabsorption (α1M, β2M), and tubular reserve/mineral metabolism (umod, intact parathyroid hormone, iFGF-23). After adjustment for CVD risk factors, estimated glomerular filtration rate, and albumin-to-creatinine ratio, 2 of the 4 tubule scores were associated with CVD (hazard ratio per SD; reabsorption, 1.21 [1.06-1.38]; reserve, 1.24 (1.08-1.38]), 1 with heart failure (reserve, 1.41 [1.13-1.74]), and none with mortality. Compared with a base model (C-statistic=0.674), adding estimated glomerular filtration rate and albumin-to-creatinine ratio improved the C-statistic (C=0.704; P=0.001); further adding tubule scores additionally improved the C-statistic (C=0.719; P=0.009). In the setting of chronic kidney disease, dimensions of tubule health quantified using factor analysis improved CVD discrimination beyond contemporary kidney measures. Clinical Trial Registration- URL: http://www.clinicaltrials.gov. Unique identifier: NCT01206062.
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Affiliation(s)
| | | | | | | | | | - Alfred K. Cheung
- University of Utah
- Veterans Affairs Salt Lake City Healthcare System
| | | | - Javier A. Neyra
- University of Texas Southwestern, Dallas
- University of Kentucky, Lexington
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Affiliation(s)
- David Naʻai
- Deparment of Medicine, John A. Burns School of Medicine, University of Hawai'i, Honolulu, Hawai'i
| | - Kalani L Raphael
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah; and .,Medicine Section, Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, Utah
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Affiliation(s)
- Jeffrey A Kraut
- Medical and Research Services Veterans Administration Greater Los Angeles (VHAGLA) Healthcare System, and Division of Nephrology VHAGLA Healthcare System, UCLA Membrane Biology Laboratory, and UCLA David Geffen School of Medicine Sciences Los Angeles, Los Angeles, CA 90073, USA.
| | - Kalani L Raphael
- Veterans Affairs Salt Lake City Healthcare System and Department of Internal Medicine, University of Utah Health, Salt Lake City, UT, USA
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Ix JH, Isakova T, Larive B, Raphael KL, Raj DS, Cheung AK, Sprague SM, Fried LF, Gassman JJ, Middleton JP, Flessner MF, Block GA, Wolf M. Effects of Nicotinamide and Lanthanum Carbonate on Serum Phosphate and Fibroblast Growth Factor-23 in CKD: The COMBINE Trial. J Am Soc Nephrol 2019; 30:1096-1108. [PMID: 31085679 DOI: 10.1681/asn.2018101058] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 03/11/2019] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Higher serum phosphate and fibroblast growth factor-23 (FGF23) levels may be modifiable to prevent cardiovascular disease in CKD. Short-term studies have reported modest efficacy in phosphate and FGF23 reduction with intestinal phosphate binders in CKD. METHODS To investigate effects of lanthanum carbonate (LC; a phosphate binder) and/or nicotinamide (NAM; an inhibitor of active intestinal phosphate transport) on serum phosphate and FGF23 in stage 3b/4 CKD, we conducted a randomized trial among individuals with eGFR 20-45 ml/min per 1.73 m2 to NAM (750 mg twice daily) plus LC (1000 mg thrice daily), NAM plus LC placebo, LC plus NAM placebo, or double placebo for 12 months. Dual primary end points were change from baseline in serum phosphate and intact FGF23 concentrations. RESULTS Mean eGFR for the 205 participants was 32ml/min per 1.73 m2. At baseline, serum phosphate was 3.7 mg/dl and median FGF23 was 99 pg/ml (10th, 90th percentiles: 59, 205). Mean rates of change in phosphate increased slightly over 12 months in all groups and did not differ significantly across arms. Similarly, percent changes in FGF23 per 12 months increased for all arms except LC plus placebo, and did not differ significantly across arms. Gastrointestinal symptoms limited adherence. Adverse events rates were similar across arms. CONCLUSIONS LC and/or NAM treatment did not significantly lower serum phosphate or FGF23 in stage 3b/4 CKD over 12 months. Although these agents appeared safe, intestinal symptoms limited adherence. Reducing phosphate and FGF23 in nondialysis CKD will require new approaches.
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Affiliation(s)
- Joachim H Ix
- Division of Nephrology-Hypertension, Department of Medicine and .,Nephrology Section, Veterans Affairs San Diego Healthcare System, La Jolla, California.,Division of Preventive Medicine, Department of Family Medicine and Public Health, University of California San Diego, San Diego, California
| | - Tamara Isakova
- Division of Nephrology and Hypertension.,Department of Medicine, and.,Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Brett Larive
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Kalani L Raphael
- Salt Lake City Veterans Affairs Healthcare System and.,Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah
| | - Dominic S Raj
- Division of Renal Diseases and Hypertension, George Washington University, Washington, DC
| | - Alfred K Cheung
- Salt Lake City Veterans Affairs Healthcare System and.,Division of Nephrology and Hypertension, University of Utah Health, Salt Lake City, Utah
| | - Stuart M Sprague
- Division of Nephrology, Department of Medicine, NorthShore University Health System-University of Chicago, Pritzker School of Medicine, Evanston, Illinois
| | - Linda F Fried
- Renal Section.,Veterans Affairs Pittsburgh Healthcare System, and.,University of Pittsburgh School of Medicine and University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania
| | - Jennifer J Gassman
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - John P Middleton
- Division of Nephrology.,Department of Medicine, and.,Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
| | - Michael F Flessner
- Division of Kidney, Urologic, and Hematologic Disorders, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland; and
| | | | - Myles Wolf
- Division of Nephrology.,Department of Medicine, and.,Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
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Abstract
Maintenance of normal acid-base homeostasis is one of the most important kidney functions. In chronic kidney disease, the capacity of the kidneys to excrete the daily acid load as ammonium and titratable acid is impaired, resulting in acid retention and metabolic acidosis. The prevalence of metabolic acidosis increases with declining glomerular filtration rate. Metabolic acidosis is associated with several clinically important complications, including chronic kidney disease progression, bone demineralization, skeletal muscle catabolism, and mortality. To mitigate these adverse consequences, clinical practice guidelines suggest treating metabolic acidosis with oral alkali in patients with chronic kidney disease. However, large clinical trials to determine the efficacy and safety of correcting metabolic acidosis with oral alkali in patients with chronic kidney disease have yet to be conducted. In this Core Curriculum article, established and emerging concepts regarding kidney acid-base regulation and the pathogenesis, risk factors, diagnosis, and management of metabolic acidosis in chronic kidney disease are discussed.
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Affiliation(s)
- Kalani L Raphael
- Veterans Affairs Salt Lake City Healthcare System and Department of Internal Medicine, University of Utah Health, Salt Lake City, UT.
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Jotwani VK, Lee AK, Estrella MM, Katz R, Garimella PS, Malhotra R, Rifkin DE, Ambrosius W, Freedman BI, Cheung AK, Raphael KL, Drawz P, Neyra JA, Oparil S, Punzi H, Shlipak MG, Ix JH. Urinary Biomarkers of Tubular Damage Are Associated with Mortality but Not Cardiovascular Risk among Systolic Blood Pressure Intervention Trial Participants with Chronic Kidney Disease. Am J Nephrol 2019; 49:346-355. [PMID: 30939472 DOI: 10.1159/000499531] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 02/11/2019] [Indexed: 01/08/2023]
Abstract
BACKGROUND Kidney tubulointerstitial fibrosis on biopsy is a strong predictor of chronic kidney disease (CKD) progression, and CKD is associated with elevated risk of cardiovascular disease (CVD). Tubular health is poorly quantified by traditional kidney function measures, including estimated glomerular filtration rate (eGFR) and albuminuria. We hypothesized that urinary biomarkers of tubular injury, inflammation, and repair would be associated with higher risk of CVD and mortality in persons with CKD. METHODS We measured urinary concentrations of interleukin-18 (IL-18), kidney injury molecule-1, neutrophil gelatinase-associated lipocalin, monocyte chemoattractant protein-1, and chitinase-3-like protein-1 (YKL-40) at baseline among 2,377 participants of the Systolic Blood Pressure Intervention Trial who had an eGFR < 60 mL/min/1.73 m2. We used Cox proportional hazards models to evaluate biomarker associations with CVD events and all-cause mortality. RESULTS At baseline, the mean age of participants was 72 ± 9 years, and eGFR was 48 ± 11 mL/min/1.73 m2. Over a median follow-up of 3.8 years, 305 CVD events (3.6% per year) and 233 all-cause deaths (2.6% per year) occurred. After multivariable adjustment including eGFR, albuminuria, and urinary creatinine, none of the biomarkers showed statistically significant associations with CVD risk. Urinary IL-18 (hazard ratio [HR] per 2-fold higher value, 1.14; 95% CI 1.01-1.29) and YKL-40 (HR per 2-fold higher value, 1.08; 95% CI 1.02-1.14) concentrations were each incrementally associated with higher mortality risk. Associations were similar when stratified by randomized blood pressure arm. CONCLUSIONS Among hypertensive trial participants with CKD, higher urinary IL-18 and YKL-40 were associated with higher risk of mortality, but not CVD.
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Affiliation(s)
- Vasantha K Jotwani
- Department of Medicine, San Francisco VA Medical Health Care System, San Francisco, California, USA,
- Kidney Health Research Collaborative, San Francisco VA Medical Center and University of California, San Francisco, California, USA,
| | - Alexandra K Lee
- Kidney Health Research Collaborative, San Francisco VA Medical Center and University of California, San Francisco, California, USA
| | - Michelle M Estrella
- Department of Medicine, San Francisco VA Medical Health Care System, San Francisco, California, USA
- Kidney Health Research Collaborative, San Francisco VA Medical Center and University of California, San Francisco, California, USA
| | - Ronit Katz
- Kidney Research Institute, University of Washington, Seattle, Washington, USA
| | - Pranav S Garimella
- Department of Medicine, University of California, San Diego, California, USA
| | - Rakesh Malhotra
- Department of Medicine, University of California, San Diego, California, USA
- Veterans Affairs San Diego Healthcare System, San Diego, California, USA
| | - Dena E Rifkin
- Department of Medicine, University of California, San Diego, California, USA
- Veterans Affairs San Diego Healthcare System, San Diego, California, USA
| | - Walter Ambrosius
- Department of Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Barry I Freedman
- Department of Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Alfred K Cheung
- Department of Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Kalani L Raphael
- Department of Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Paul Drawz
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Javier A Neyra
- Department of Medicine, University of Kentucky, Lexington, Kentucky, USA
| | - Suzanne Oparil
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Henry Punzi
- Punzi Medical Center, Trinity Hypertension Research Institute, Carollton, Texas, USA
| | - Michael G Shlipak
- Department of Medicine, San Francisco VA Medical Health Care System, San Francisco, California, USA
- Kidney Health Research Collaborative, San Francisco VA Medical Center and University of California, San Francisco, California, USA
| | - Joachim H Ix
- Department of Medicine, University of California, San Diego, California, USA
- Veterans Affairs San Diego Healthcare System, San Diego, California, USA
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Frodsham SG, Yu Z, Lyons AM, Agarwal A, Pezzolesi MH, Dong L, Srinivas TR, Ying J, Greene T, Raphael KL, Smith KR, Pezzolesi MG. The Familiality of Rapid Renal Decline in Diabetes. Diabetes 2019; 68:420-429. [PMID: 30425064 PMCID: PMC6341306 DOI: 10.2337/db18-0838] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 11/05/2018] [Indexed: 12/15/2022]
Abstract
Sustained and rapid loss of glomerular filtration rate (GFR) is the predominant clinical feature of diabetic kidney disease and a requisite for the development of end-stage renal disease. Although GFR trajectories have been studied in several cohorts with diabetes and without diabetes, whether rapid renal decline clusters in families with diabetes has not been examined. To determine this, we estimated GFR (eGFR) from serum creatinine measurements obtained from 15,612 patients with diabetes at the University of Utah Health Sciences Center and established their renal function trajectories. Patients with rapid renal decline (eGFR slope < -5 mL/min/1.73 m2/year) were then mapped to pedigrees using extensive genealogical records from the Utah Population Database to identify high-risk rapid renal decline pedigrees. We identified 2,127 (13.6%) rapid decliners with a median eGFR slope of -8.0 mL/min/1.73 m2/year and 51 high-risk pedigrees (ranging in size from 1,450 to 24,501 members) with excess clustering of rapid renal decline. Familial analysis showed that rapid renal decline aggregates in these families and is associated with its increased risk among first-degree relatives. Further study of these families is necessary to understand the magnitude of the influence of shared familial factors, including environmental and genetic factors, on rapid renal decline in diabetes.
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Affiliation(s)
- Scott G Frodsham
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Zhe Yu
- Population Science, Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, UT
| | - Ann M Lyons
- Hospital Information Technology Services, Enterprise Data Warehouse, University of Utah Hospital and Clinics, Salt Lake City, UT
| | - Adhish Agarwal
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Melissa H Pezzolesi
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Li Dong
- Division of Nephrology, Intermountain Healthcare, Salt Lake City, UT
| | - Titte R Srinivas
- Division of Nephrology, Intermountain Healthcare, Salt Lake City, UT
| | - Jian Ying
- Department of Population Health Sciences, University of Utah School of Medicine, Salt Lake City, UT
| | - Tom Greene
- Department of Population Health Sciences, University of Utah School of Medicine, Salt Lake City, UT
| | - Kalani L Raphael
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
- Medicine Section and Research Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, UT
| | - Ken R Smith
- Population Science, Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, UT
| | - Marcus G Pezzolesi
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
- Diabetes and Metabolism Center, University of Utah School of Medicine, Salt Lake City, UT
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Ginsberg C, Craven TE, Chonchol MB, Cheung AK, Sarnak MJ, Ambrosius WT, Killeen AA, Raphael KL, Bhatt UY, Chen J, Chertow GM, Freedman BI, Oparil S, Papademetriou V, Wall BM, Wright CB, Ix JH, Shlipak MG. PTH, FGF23, and Intensive Blood Pressure Lowering in Chronic Kidney Disease Participants in SPRINT. Clin J Am Soc Nephrol 2018; 13:1816-1824. [PMID: 30425104 PMCID: PMC6302330 DOI: 10.2215/cjn.05390518] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 09/06/2018] [Indexed: 12/23/2022]
Abstract
BACKGROUND AND OBJECTIVES The Systolic Blood Pressure Intervention Trial (SPRINT) demonstrated that intensive BP lowering reduced the risk of cardiovascular disease, but increased eGFR decline. Serum parathyroid hormone (PTH) and fibroblast growth factor-23 (FGF23) concentrations are elevated in CKD and are associated with cardiovascular disease. We evaluated whether intact PTH or intact FGF23 concentrations modify the effects of intensive BP control on cardiovascular events, heart failure, and all-cause mortality in SPRINT participants with CKD. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We measured PTH and FGF23 in 2486 SPRINT participants with eGFR<60 ml/min per 1.73 m2 at baseline. Cox models were used to evaluate whether serum PTH and FGF23 concentrations were associated with cardiovascular events, heart failure, and all-cause mortality, and whether PTH and FGF23 modified the effects of intensive BP control. RESULTS The mean age of this subcohort was 73 years, 60% were men, and mean eGFR was 46±11 ml/min per 1.73 m2. Median PTH was 48 (interquartile range [IQR], 35-67) pg/ml and FGF23 was 66 (IQR, 52-88) pg/ml. There were 261 composite cardiovascular events, 102 heart failure events, and 179 deaths within the subcohort. The adjusted hazard ratio (HR) per doubling of PTH concentration for cardiovascular events, heart failure, and all-cause mortality were 1.29 (95% confidence interval [95% CI], 1.06 to 1.57), 1.32 (95% CI, 0.96 to 1.83), and 1.04 (95% CI, 0.82 to 1.31), respectively. There were significant interactions between PTH and BP arm for both the cardiovascular (P-interaction=0.01) and heart failure (P-interaction=0.004) end points. Participants with a PTH above the median experienced attenuated benefits of intensive BP control on cardiovascular events (adjusted HR, 1.02; 95% CI, 0.72 to 1.42) compared with participants with a PTH below the median (adjusted HR, 0.67; 95% CI, 0.45 to 1.00). FGF23 was not independently associated with any outcome and did not modify the effects of the intervention. CONCLUSIONS SPRINT participants with CKD and a high serum PTH received less cardiovascular protection from intensive BP therapy than participants with a lower serum PTH.
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Affiliation(s)
- Charles Ginsberg
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
- Division of Nephrology-Hypertension, University of California, San Diego, San Diego, California
| | | | - Michel B. Chonchol
- Division of Renal Diseases and Hypertension, University of Anschutz Medical Center, Aurora, Colorado
| | - Alfred K. Cheung
- Division of Nephrology and Hypertension, University of Utah, Salt Lake City, Utah
| | - Mark J. Sarnak
- Division of Nephrology, Department of Medicine, Tufts Medical Center, Boston, Massachusetts
| | | | - Anthony A. Killeen
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
| | - Kalani L. Raphael
- Division of Nephrology and Hypertension, University of Utah, Salt Lake City, Utah
| | - Udayan Y. Bhatt
- Division of Nephrology, The Ohio State University, Wexner Medical Center, Columbus, Ohio
| | - Jing Chen
- Nephrology and Hypertension Section, Tulane University School of Medicine, New Orleans, Louisiana
| | - Glenn M. Chertow
- Division of Nephrology, Stanford University School of Medicine, Palo Alto, California
| | - Barry I. Freedman
- Nephrology Section, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Suzanne Oparil
- Division of Cardiovascular Disease, University of Alabama School of Medicine, Birmingham, Alabama
| | | | - Barry M. Wall
- Division of Nephrology, Veterans Affairs Medical Center, Memphis, Tennessee
| | | | - Joachim H. Ix
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
- Division of Nephrology-Hypertension, University of California, San Diego, San Diego, California
| | - Michael G. Shlipak
- Kidney Health Research Collaborative, Veterans Affairs Medical Center, San Francisco, California; and
- Department of Medicine, University of California, San Francisco, San Francisco, California
| | - for the SPRINT Research Group
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
- Division of Nephrology-Hypertension, University of California, San Diego, San Diego, California
- Department of Biostatistical Sciences and
- Nephrology Section, Wake Forest School of Medicine, Winston-Salem, North Carolina
- Division of Renal Diseases and Hypertension, University of Anschutz Medical Center, Aurora, Colorado
- Division of Nephrology and Hypertension, University of Utah, Salt Lake City, Utah
- Division of Nephrology, Department of Medicine, Tufts Medical Center, Boston, Massachusetts
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
- Division of Nephrology, The Ohio State University, Wexner Medical Center, Columbus, Ohio
- Nephrology and Hypertension Section, Tulane University School of Medicine, New Orleans, Louisiana
- Division of Nephrology, Stanford University School of Medicine, Palo Alto, California
- Division of Cardiovascular Disease, University of Alabama School of Medicine, Birmingham, Alabama
- Division of Cardiology, Georgetown University Medical Center, Washington, DC
- Division of Nephrology, Veterans Affairs Medical Center, Memphis, Tennessee
- Department of Neurology, University of Miami, Miami, Florida
- Kidney Health Research Collaborative, Veterans Affairs Medical Center, San Francisco, California; and
- Department of Medicine, University of California, San Francisco, San Francisco, California
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Chen W, Newman AB, Fried LF, Rifkin DE, Shlipak MG, Sarnak MJ, Katz R, Madero M, Raphael KL, Bushinsky DA, Ix JH. Relationship of acid-base status with arterial stiffness in community-living elders: the Health ABC Study. Nephrol Dial Transplant 2018; 33:1572-1579. [PMID: 29177410 DOI: 10.1093/ndt/gfx292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 09/09/2017] [Indexed: 11/13/2022] Open
Abstract
Background Animal studies suggest that acidosis protects against arterial calcification, which contributes to arterial stiffness. The goal of this study was to investigate the associations of serum bicarbonate and pH with arterial stiffness in community-living older adults. Methods We performed cross-sectional analyses among 1698 well-functioning participants 70-79 years of age. Bicarbonate and pH were measured by arterialized venous blood gas at the point of care. Bicarbonate was categorized into low (<23 mEq/L), normal (23-27.9) and high (≥28). Arterialized venous pH (AVpH) was categorized into tertiles: ≤7.40, >7.40-7.42 and >7.42. Arterial stiffness was evaluated by pulse wave velocity (PWV) and high ankle-brachial index (ABI; >1.3/incompressible). We used linear and logistic regression to evaluate the association of bicarbonate and AVpH with PWV and high ABI, respectively. Results The mean age was 76 years and 15% had an estimated glomerular filtration rate (eGFR) <60 mL/min/1.73 m2. The mean bicarbonate was 25.2 ± 2.1 mEq/L and the mean AVpH was 7.41 ± 0.03. Compared with participants in the normal bicarbonate category, those in the low bicarbonate group had 8.8% higher PWV (P = 0.006) and 1.87 greater odds of high ABI (P = 0.04). However, the associations were not significant after adjusting for eGFR (P = 0.24 and 0.43, respectively). There was no difference in PWV or high ABI across AVpH tertiles. Results were similar in those with and without chronic kidney disease and after excluding participants on diuretics. Conclusions We did not observe an independent association of bicarbonate or AVpH with arterial stiffness measured by high PWV or ABI in community-living older individuals. Future studies evaluating patients with a greater severity of chronic kidney disease and with more extreme alterations in acid-base status are warranted.
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Affiliation(s)
- Wei Chen
- Department of Medicine, School of Medicine and Dentistry, University of Rochester, Rochester, NY, USA
| | - Anne B Newman
- Center for Aging and Population Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Linda F Fried
- Renal Section, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
| | - Dena E Rifkin
- Department of Medicine, University of California San Diego, San Diego, CA, USA
| | - Michael G Shlipak
- General Internal Medicine Section, VA Medical Center, University of California, San Francisco, CA, USA
| | - Mark J Sarnak
- Department of Nephrology, Tufts Medical Center, Boston, MA, USA
| | - Ronit Katz
- Department of Biostatistics, University of Washington, Seattle, WA, USA
| | | | | | - David A Bushinsky
- Department of Medicine, School of Medicine and Dentistry, University of Rochester, Rochester, NY, USA
| | - Joachim H Ix
- Department of Medicine, University of California San Diego, San Diego, CA, USA.,Veterans Affairs San Diego Healthcare System, San Diego, CA, USA
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42
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Affiliation(s)
- Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Internal Medicine, University of Utah School of Health, Salt Lake City, Utah
- Research Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
| | - Joachim H Ix
- Division of Nephrology-Hypertension, Department of Medicine and
- Division of Preventive Medicine, Department of Family Medicine and Public Health, University of California San Diego, San Diego, California; and
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
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43
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Dobre M, Gaussoin SA, Bates JT, Chonchol MB, Cohen DL, Hostetter TH, Raphael KL, Taylor AA, Lerner AJ, Wright JT, Rahman M. Serum Bicarbonate Concentration and Cognitive Function in Hypertensive Adults. Clin J Am Soc Nephrol 2018; 13:596-603. [PMID: 29567858 PMCID: PMC5968905 DOI: 10.2215/cjn.07050717] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 01/05/2018] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Cognitive function worsens as kidney function declines, but mechanisms contributing to this association are not completely understood. Metabolic acidosis, a common complication of CKD, leads to neural networks overexcitation and is involved in cerebral autoregulation. We aimed to evaluate the association between serum bicarbonate concentration as a measure of metabolic acidosis, and cognitive function in hypertensive adults with and without CKD. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Five cognitive summary scores were measured (global cognitive function, executive function, memory, attention/concentration, and language) in 2853 participants in the Systolic BP Intervention Trial (SPRINT). Multivariable linear regression models adjusted for demographics, comorbidities, systolic BP, medications, eGFR and albuminuria evaluated the cross-sectional association between bicarbonate and cognition at SPRINT baseline. In a subset (n=681) who underwent brain magnetic resonance imaging, the models were adjusted for white matter hyperintensity volume, vascular reactivity, and cerebral blood flow. RESULTS The mean age (SD) was 68 (8.5) years. Global cognitive and executive functions were positively associated with serum bicarbonate (estimate [SEM]: 0.014 [0.006]; P=0.01, and 0.018 [0.006]; P=0.003, respectively). Each 1 mEq/L lower bicarbonate level had a similar association with global cognitive and executive function as being 4.3 and 5.4 months older, respectively. The association with global cognition persisted after magnetic resonance imaging findings adjustment (estimate [SEM]: 0.03 [0.01]; P=0.01). There was no association between serum bicarbonate level and memory, attention/concentration, and language. CONCLUSIONS In a large cohort of hypertensive adults, higher serum bicarbonate levels were independently associated with better global cognitive and executive performance. (ClinicalTrials.gov: NCT01206062).
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Affiliation(s)
- Mirela Dobre
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
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Raphael KL, Gilligan S, Ix JH. Urine Anion Gap to Predict Urine Ammonium and Related Outcomes in Kidney Disease. Clin J Am Soc Nephrol 2018; 13:205-212. [PMID: 29097482 PMCID: PMC5967420 DOI: 10.2215/cjn.03770417] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 09/25/2017] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND OBJECTIVES Low urine ammonium excretion is associated with ESRD in CKD. Few laboratories measure urine ammonium, limiting clinical application. We determined correlations between urine ammonium, the standard urine anion gap, and a modified urine anion gap that includes sulfate and phosphate and compared risks of ESRD or death between these ammonium estimates and directly measured ammonium. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We measured ammonium, sodium, potassium, chloride, phosphate, and sulfate from baseline 24-hour urine collections in 1044 African-American Study of Kidney Disease and Hypertension participants. We evaluated the cross-sectional correlations between urine ammonium, the standard urine anion gap (sodium + potassium - chloride), and a modified urine anion gap that includes urine phosphate and sulfate in the calculation. Multivariable-adjusted Cox models determined the associations of the standard urine anion gap and the modified urine anion gap with the composite end point of death or ESRD; these results were compared with results using urine ammonium as the predictor of interest. RESULTS The standard urine anion gap had a weak and direct correlation with urine ammonium (r=0.18), whereas the modified urine anion gap had a modest inverse relationship with urine ammonium (r=-0.58). Compared with the highest tertile of urine ammonium, those in the lowest urine ammonium tertile had higher risk of ESRD or death (hazard ratio, 1.46; 95% confidence interval, 1.13 to 1.87) after adjusting for demographics, GFR, proteinuria, and other confounders. In comparison, participants in the corresponding standard urine anion gap tertile did not have higher risk of ESRD or death (hazard ratio, 0.82; 95% confidence interval, 0.64 to 1.07), whereas the risk for those in the corresponding modified urine anion gap tertile (hazard ratio, 1.32; 95% confidence interval, 1.03 to 1.68) approximated that of directly measured urine ammonium. CONCLUSIONS Urine anion gap is a poor surrogate of urine ammonium in CKD unless phosphate and sulfate are included in the calculation. Because the modified urine anion gap merely estimates urine ammonium and requires five measurements, direct measurements of urine ammonium are preferable in CKD.
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Affiliation(s)
- Kalani L. Raphael
- Division of Nephrology, Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
- Nephrology Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
| | - Sarah Gilligan
- Division of Nephrology, Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Joachim H. Ix
- Division of Nephrology-Hypertension, Department of Medicine and
- Division of Preventive Medicine, Department of Family Medicine and Public Health, University of California, San Diego, California; and
- Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
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Raphael KL, Gilligan S, Hostetter TH, Greene T, Beddhu S. Association between Urine Ammonium and Urine TGF- β1 in CKD. Clin J Am Soc Nephrol 2018; 13:223-230. [PMID: 29146699 PMCID: PMC5967432 DOI: 10.2215/cjn.07510717] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Accepted: 10/16/2017] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Urinary ammonium excretion increases in response to nonvolatile acids to maintain normal systemic bicarbonate and pH. However, enhanced ammonia production promotes tubulointerstitial fibrosis in animal models. Therefore, a subset of individuals with CKD and normal bicarbonate may have acid-mediated kidney fibrosis that might be better linked with ammonium excretion than bicarbonate. We hypothesized that urine TGF-β1, as an indicator of kidney fibrosis, would be more tightly linked with urine ammonium excretion than serum bicarbonate and other acid-base indicators. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We measured serum bicarbonate and urinary ammonium, titratable acids, pH, and TGF-β1/creatinine in 144 persons with CKD. Multivariable-adjusted linear regression models determined the cross-sectional association between TGF-β1/creatinine and serum bicarbonate, urine ammonium excretion, urine titratable acids excretion, and urine pH. RESULTS Mean eGFR was 42 ml/min per 1.73 m2, mean age was 65 years old, 78% were men, and 62% had diabetes. Mean urinary TGF-β1/creatinine was 102 (49) ng/g, mean ammonium excretion was 1.27 (0.72) mEq/h, mean titratable acids excretion was 1.14 (0.65) mEq/h, mean urine pH was 5.6 (0.5), and mean serum bicarbonate was 23 (3) mEq/L. After adjusting for eGFR, proteinuria, and other potential confounders, each SD increase of urine ammonium and urine pH was associated with a statistically significant 1.22-fold (95% confidence interval, 1.11 to 1.35) or 1.11-fold (95% confidence interval, 1.02 to 1.21) higher geometric mean urine TGF-β1/creatinine, respectively. Each SD increase of serum bicarbonate and urine titratable acids was associated with a nonsignificant 1.06-fold (95% confidence interval, 0.97 to 1.16) or 1.03-fold (95% confidence interval, 0.92 to 1.14) higher geometric mean urine TGF-β1/creatinine, respectively. CONCLUSIONS Urinary ammonium excretion but not serum bicarbonate is associated with higher urine TGF-β1/creatinine.
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Affiliation(s)
- Kalani L. Raphael
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
- Medicine Section and Research Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah; and
| | - Sarah Gilligan
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Thomas H. Hostetter
- Department of Internal Medicine, Case Western Reserve School of Medicine, Cleveland, Ohio
| | - Tom Greene
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
| | - Srinivasan Beddhu
- Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah
- Medicine Section and Research Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah; and
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Abstract
Metabolic acidosis is not uncommon in CKD and is linked with bone demineralization, muscle catabolism, and higher risks of CKD progression and mortality. Clinical practice guidelines recommend maintaining serum total CO2 at ≥22 mEq/L to help prevent these complications. Although a definitive trial testing whether correcting metabolic acidosis improves clinical outcomes has not been conducted, results from small, single-center studies support this notion. Furthermore, biologic plausibility supports the notion that a subset of patients with CKD have acid-mediated organ injury despite having a normal serum total CO2 and might benefit from oral alkali before overt acidosis develops. Identifying these individuals with subclinical metabolic acidosis is challenging, but recent results suggest that urinary acid excretion measurements may be helpful. The dose of alkali to provide in this setting is unknown as well. The review discusses these topics and the prevalence and risk factors of metabolic acidosis, mechanisms of acid-mediated organ injury, results from interventional studies, and potential harms of alkali therapy in CKD.
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Affiliation(s)
- Kalani L Raphael
- Veterans Affairs Salt Lake City Health Care System and Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
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Gilligan S, Raphael KL. Hyperkalemia and Hypokalemia in CKD: Prevalence, Risk Factors, and Clinical Outcomes. Adv Chronic Kidney Dis 2017; 24:315-318. [PMID: 29031358 DOI: 10.1053/j.ackd.2017.06.004] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Accepted: 06/20/2017] [Indexed: 01/13/2023]
Abstract
Abnormalities of serum potassium are common in patients with CKD. Although hyperkalemia is a well-recognized complication of CKD, the prevalence rates of hyperkalemia (14%-20%) and hypokalemia (12%-18%) are similar. CKD severity, use of medications such as renin-angiotensin-aldosterone system inhibitors and diuretics, and dietary potassium intake are major determinants of serum potassium concentration in CKD. Demographic factors, acid-base status, blood glucose, and other comorbidities contribute as well. Both hyperkalemia and hypokalemia are associated with similarly increased risks of death, cardiovascular disease, and hospitalization. On the other hand, limited evidence suggests a link between hypokalemia, but not hyperkalemia, and progression of CKD. This article reviews the prevalence rates and risk factors for hyperkalemia and hypokalemia, and their associations with adverse outcomes in CKD.
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Raphael KL, Carroll DJ, Murray J, Greene T, Beddhu S. Urine Ammonium Predicts Clinical Outcomes in Hypertensive Kidney Disease. J Am Soc Nephrol 2017; 28:2483-2490. [PMID: 28385806 DOI: 10.1681/asn.2016101151] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Accepted: 01/24/2017] [Indexed: 01/13/2023] Open
Abstract
Metabolic acidosis is associated with poor outcomes in CKD. Because impaired renal ammonium excretion is important in the pathogenesis of acidosis, urine ammonium excretion might be a better and perhaps earlier acid-base indicator of risk than serum bicarbonate, particularly in patients without acidosis. We evaluated the association between baseline ammonium excretion and clinical outcomes in African American Study of Kidney Disease and Hypertension participants (n=1044). Median daily ammonium excretion was 19.5 (95% confidence interval [95% CI], 6.5 to 43.2) mEq. In Cox regression models (adjusted for demographics, measured GFR, proteinuria, body mass index, net endogenous acid production, and serum potassium and bicarbonate), hazard ratios of the composite outcome of death or dialysis were 1.46 (95% CI, 1.13 to 1.87) in the low tertile and 1.14 (95% CI, 0.89 to 1.46) in the middle tertile of daily ammonium excretion compared with the high tertile. Among participants without acidosis at baseline, the adjusted hazard ratio for those with ammonium excretion <20 mEq/d was 1.36 (95% CI, 1.09 to 1.71) compared with those with ammonium excretion ≥20 mEq/d. Additionally, compared with participants in the high ammonium tertile, those in the low ammonium tertile had higher adjusted odds of incident acidosis at 1 year (adjusted odds ratio, 2.56; 95% CI, 1.04 to 6.27). In conclusion, low ammonium excretion is associated with death and renal failure in hypertensive kidney disease, even among those without acidosis. Low ammonium excretion could identify patients with CKD and normal bicarbonate levels who might benefit from alkali before acidosis develops.
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Affiliation(s)
- Kalani L Raphael
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah and .,VA Salt Lake City Health Care System, Salt Lake City, Utah
| | - David J Carroll
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah and
| | - Jennifer Murray
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah and
| | - Tom Greene
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah and
| | - Srinivasan Beddhu
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah and.,VA Salt Lake City Health Care System, Salt Lake City, Utah
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Affiliation(s)
- Kalani L Raphael
- Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah; and .,Research Section, Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah
| | - Fuad S Shihab
- Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah; and
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Beddhu S, Chen X, Wei G, Raj D, Raphael KL, Boucher R, Chonchol MB, Murtaugh MA, Greene T. Associations of Protein-Energy Wasting Syndrome Criteria With Body Composition and Mortality in the General and Moderate Chronic Kidney Disease Populations in the United States. Kidney Int Rep 2017; 2:390-399. [PMID: 28840197 PMCID: PMC5563827 DOI: 10.1016/j.ekir.2017.01.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Introduction It is unknown whether the criteria used to define protein−energy wasting (PEW) syndrome in dialysis patients reflect protein or energy wasting in the general and moderate CKD populations. Methods In 11,834 participants in the 1999 to 2004 National Health and Nutrition Examination Survey, individual PEW syndrome criteria and the number of PEW syndrome categories were related to lean body and fat masses (measured by dual-energy absorptiometry) using linear regression in the entire cohort and CKD subpopulation. Results Serum chemistry, body mass, and muscle mass PEW criteria tended to be associated with lower lean body and fat masses, but the low dietary protein and energy intake criteria were associated with significantly higher protein and energy stores. When the number of PEW syndrome categories was defined by nondietary categories alone, there was a monotonic inverse relationship with lean body and fat masses and a strong positive relationship with mortality. In contrast, when dietary category alone was present, mean body mass index was in the obesity range; the additional presence of 2 nondietary categories was associated with lower body mass index and lower lean body and fat masses. Thus, the association of a dietary category plus 2 additional nondietary categories with lower protein or energy stores was driven by the presence of the 2 nondietary categories. Results were similar in CKD subgroup. Discussion Hence, a definition of PEW syndrome without dietary variables has face validity and reflects protein or energy wasting.
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Affiliation(s)
- Srinivasan Beddhu
- Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT.,Department of Medicine, University of Utah School of Medicine, Salt Lake City UT
| | - Xiaorui Chen
- Department of Medicine, University of Utah School of Medicine, Salt Lake City UT
| | - Guo Wei
- Department of Medicine, University of Utah School of Medicine, Salt Lake City UT
| | - Dominic Raj
- Department of Medicine, George Washington School of Medicine, Washington, DC
| | - Kalani L Raphael
- Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT.,Department of Medicine, University of Utah School of Medicine, Salt Lake City UT
| | - Robert Boucher
- Department of Medicine, University of Utah School of Medicine, Salt Lake City UT
| | - Michel B Chonchol
- Department of Medicine, University of Colorado School of Medicine, Denver, CO
| | - Maureen A Murtaugh
- Department of Medicine, University of Utah School of Medicine, Salt Lake City UT
| | - Tom Greene
- Department of Medicine, University of Utah School of Medicine, Salt Lake City UT.,Department of Population Health Sciences, University of Utah School of Medicine, Salt Lake City UT
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