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Dopierała M, Schwermer K, Hoppe K, Kupczyk M, Pawlaczyk K. Benefits of Preserving Residual Urine Output in Patients Undergoing Maintenance Haemodialysis. Int J Nephrol Renovasc Dis 2023; 16:231-240. [PMID: 37868106 PMCID: PMC10590073 DOI: 10.2147/ijnrd.s421533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 09/01/2023] [Indexed: 10/24/2023] Open
Abstract
Introduction Chronic kidney disease is a widespread medical problem that leads to higher morbidity, mortality, and a decrease in the overall well-being of the general population. This is especially expressed in patients with end-stage renal disease (ESRD) undergoing maintenance haemodialysis. Several variables could be used to evaluate those patients' well-being and mortality risk. One of them is the presence of residual urine output. Materials and Methods The study was conducted on 485 patients treated with maintenance haemodialysis. After enrollment in the study, which consisted of medical history, physical examination, hydration assessment, and blood sampling, each patient was followed up for 24 months. We used residual urine output (RUO) as a measure of residual renal function (RRF). The entire cohort was divided into 4 subgroups based on the daily urinary output (<=100mL per day, >100mL to <=500mL, >500mL to <=1000mL and >1000mL). Results The data show that the mortality rate was significantly higher in groups with lower RUO, which was caused mainly by cardiovascular events. Also, patients with higher RUO achieved better sodium, potassium, calcium, and phosphate balance. They were also less prone to overhydration and had a better nutritional status. Preserved RRF also had a positive impact on markers of cardiovascular damage, such as NT-proBNP as well as TnT. Conclusion In conclusion, preserving residual urine output in ESRD patients undergoing maintenance haemodialysis is invaluable in reducing their morbidity and mortality rates and enhancing other favourable parameters of those patients.
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Affiliation(s)
- Mikołaj Dopierała
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
| | - Krzysztof Schwermer
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
| | - Krzysztof Hoppe
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
| | - Małgorzata Kupczyk
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
| | - Krzysztof Pawlaczyk
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
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Lang SM, Bergner A, Töpfer M, Schiffl H. Preservation of Residual Renal Function in Dialysis Patients: Effects of Dialysis-Technique–Related Factors. Perit Dial Int 2020. [DOI: 10.1177/089686080102100108] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Objectives Residual renal function (RRF) is of paramount importance to dialysis adequacy, morbidity, and mortality, particularly for long-term continuous ambulatory peritoneal dialysis (CAPD) patients. Residual renal function seems to be better preserved in patients on CAPD than in hemodialysis (HD) patients. We analyzed RRF in 45 patients with end-stage renal disease (ESRD), commencing either CAPD or HD, to prospectively define the time course of the decline in RRF, and to evaluate dialysis-technique–related factors such as cardiovascular stability and bioincompatibility. Study Design Single-center prospective investigation in parallel design with matched pairs. Materials Fifteen patients starting CAPD and 15 matched pairs of patients commencing HD were matched according to cause of renal failure and RRF. Hemodialysis patients were assigned to two dialyzer membranes differing markedly in their potential to activate complement and cells (bioincompatibility). Fifteen patients were treated exclusively with the cuprophane membrane (bioincompatible) and the other 15 patients received HD with the high-flux polysulfone membrane (biocompatible). Measurements Residual renal function was determined at initiation of dialytic therapy and after 6, 12, and 24 months. Dry weight (by chest x ray and diameter of the vena cava) was closely recorded throughout the study, and the number of hypotensive episodes counted. Results Residual renal function declined in both CAPD and HD patients, although this decline was faster in HD patients (2.8 mL/minute after 6 months and 3.7 mL/min after 12 months) than in CAPD patients (0.6 mL/min and 1.4 mL/ min after 6 and 12 months respectively). It declined faster in patients with bioincompatible than with biocompatible HD membranes (3.6 mL/min vs 1.9 mL/min after 6 months). Eleven percent of the HD sessions were complicated by clinically relevant blood pressure reductions, but there were no differences between the two dialyzer membrane groups. None of the CAPD patients had documented hypotensive episodes. None of the study patients suffered severe illness or received nephrotoxic antibiotics or radiocontrast media. Conclusions The better preservation of RRF in stable CAPD patients corresponded with greater cardiovascular stability compared to HD patients, independently of the membrane used. Furthermore, there was a significantly higher preservation of RRF in HD patients on polysulfone versus cuprophane membranes, indicating an additional effect of biocompatibility, such as less generation of nephrotoxic substances by the membrane. Thus, starting ESRD patients on HD prior to elective CAPD should be avoided for better preservation of RRF.
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Affiliation(s)
- Susanne M. Lang
- Department of Nephrology, Medizinische Klinik, Klinikum Innenstadt der Universität München, Munich, Germany
| | - Albrecht Bergner
- Department of Nephrology, Medizinische Klinik, Klinikum Innenstadt der Universität München, Munich, Germany
| | - Marcel Töpfer
- Department of Nephrology, Medizinische Klinik, Klinikum Innenstadt der Universität München, Munich, Germany
| | - Helmut Schiffl
- Department of Nephrology, Medizinische Klinik, Klinikum Innenstadt der Universität München, Munich, Germany
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3
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Wu MS, Lin CL, Chang CT, Wu CH, Huang JY, Yang CW. Improvement in Clinical Outcome by Early Nephrology Referral in Type Ii Diabetics on Maintenance Peritoneal Dialysis. Perit Dial Int 2020. [DOI: 10.1177/089686080302300105] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
← Objectives To evaluate the influence of early nephrology referral on clinical outcome in type II diabetes mellitus patients on maintenance peritoneal dialysis (PD). ← Design This is a retrospective study in a single University Hospital in Taiwan. ← Patients This study analyzed the type II diabetic patients entering our PD program from February 1988 to June 2000. Patients that were presented to a nephrologist more than 6 months before starting dialysis were defined as early referrals (ER). Patients were considered late referrals (LR) if they were transferred to the nephrology department within 6 months before initial dialysis. ← Main Outcome Measures Patient survival and technique survival curves were derived from Kaplan–Meier analysis and were compared using the Cox–Mantel log rank test. Covariates were analyzed with Cox proportional hazards model. ← Results 52 type II diabetic patients were enrolled in this study: 16 in the ER group and 36 in the LR group. Patient survival was better in the ER group than in the LR group {relative risks [exp(coef)] 0.42; 95% confidence interval 0.152 – 0.666; p < 0.05}. The improved survival in the ER group was independent of age at dialysis, good glycemic control, and residual renal function, as indicated in the multivariate analysis with stepwise regression by Cox proportional hazards model. The ER group was also associated with better technique survival. ← Conclusions These results suggest that early nephrology referral before initiating dialysis is associated with improved long-term clinical outcome in type II diabetics on maintenance PD.
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Affiliation(s)
- Mai-Szu Wu
- Department of Nephrology, Chang-Gung Memorial Hospital, Taipei, Taiwan
| | - Chun-Liang Lin
- Department of Nephrology, Chang-Gung Memorial Hospital, Taipei, Taiwan
| | - Chiz-Tzung Chang
- Department of Nephrology, Chang-Gung Memorial Hospital, Taipei, Taiwan
| | - Ching-Herng Wu
- Department of Nephrology, Chang-Gung Memorial Hospital, Taipei, Taiwan
| | - Jeng-Yi Huang
- Department of Nephrology, Chang-Gung Memorial Hospital, Taipei, Taiwan
| | - Chih-Wei Yang
- Department of Nephrology, Chang-Gung Memorial Hospital, Taipei, Taiwan
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4
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Singhal MK, Bhaskaran S, Vidgen E, Bargman JM, Vas SI, Oreopoulos DG. Rate of Decline of Residual Renal Function in Patients on Continuous Peritoneal Dialysis and Factors Affecting It. Perit Dial Int 2020. [DOI: 10.1177/089686080002000410] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
ObjectiveWe analyzed residual renal function (RRF) in a large number of new peritoneal dialysis (PD) patients to prospectively define the time course of decline of RRF and to evaluate the risk factors assumed to be associated with faster decline.Study DesignSingle-center, prospective cohort study.SettingHome PD unit of a tertiary care University Hospital.PatientsThe study included 242 patients starting continuous PD between January 1994 and December 1997, with a minimum follow-up of 6 months and at least three measurements of RRF.MeasurementAll patients had data on demographic and laboratory variables, episodes of peritonitis and the use of aminoglycoside (AG) antibiotics, temporary hemodialysis, and number of radiocontrast studies. Adequacy of PD was measured from 24-hour urine and dialysate collection and peritoneal equilibration test using standard methodology. Further data on RRF was collected every 3 to 4 months until the patient became anuric (urine volume < 100 mL/day or creatinine clearance < 1.0 mL/min) or until the end of study in December 1998.Outcome MeasureThe slope of the decline of residual glomerular filtration rate (GFR) (an average of renal urea and creatinine clearance) was the main outcome measure. Risk factors associated with faster decline were evaluated by a comparative analysis between patients in the highest and the lowest quartiles of the slopes of GFR, and a multivariate analysis using a stepwise option within linear regression and general linear models.ResultsThere was a gradual deterioration of residual GFR with time on PD, with 40% of patients developing anuria at a mean of 20 months after the initiation of PD. On multivariate analysis, use of a larger volume of dialysate ( p = 0.0001), higher rate of peritonitis ( p = 0.0005), higher use of AG ( p = 0.0006), presence of diabetes mellitus ( p = 0.005), larger body mass index (BMI) ( p = 0.01), and no use of antihypertensive medications ( p = 0.04) independently predicted the steep slope of residual GFR. Male gender, higher grades of left ventricular dysfunction, and higher 24-hour proteinuria were associated with faster decline on univariate analysis only.ConclusionFaster decline of residual GFR corresponds with male gender, large BMI, presence of diabetes mellitus, higher grades of congestive heart failure, and higher 24-hour proteinuria. Higher rate of peritonitis and use of AG for the treatment of peritonitis is also associated independently with faster decline of residual GFR. Whether the type of PD (CAPD vs CCPD/NIPD) is associated with faster decline of residual GFR remains speculative.
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Affiliation(s)
- Manoj K. Singhal
- Home Peritoneal Dialysis Unit, The Toronto Hospitals (General and Western Division), University of Toronto, Toronto, Ontario, Canada
| | - Shaunmukhum Bhaskaran
- Home Peritoneal Dialysis Unit, The Toronto Hospitals (General and Western Division), University of Toronto, Toronto, Ontario, Canada
| | - Edward Vidgen
- Home Peritoneal Dialysis Unit, The Toronto Hospitals (General and Western Division), University of Toronto, Toronto, Ontario, Canada
| | - Joanne M. Bargman
- Home Peritoneal Dialysis Unit, The Toronto Hospitals (General and Western Division), University of Toronto, Toronto, Ontario, Canada
| | - Stephen I. Vas
- Home Peritoneal Dialysis Unit, The Toronto Hospitals (General and Western Division), University of Toronto, Toronto, Ontario, Canada
| | - Dimitrios G. Oreopoulos
- Home Peritoneal Dialysis Unit, The Toronto Hospitals (General and Western Division), University of Toronto, Toronto, Ontario, Canada
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5
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Caravaca F, Dominguez C, Arrobas M. Predictors of Loss of Residual Renal Function in Peritoneal Dialysis Patients. Perit Dial Int 2020. [DOI: 10.1177/089686080202200319] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Francisco Caravaca
- Servicio de Nefrología Hospital Universitario Infanta Cristina Badajoz, Spain
| | - Carmen Dominguez
- Servicio de Nefrología Hospital Universitario Infanta Cristina Badajoz, Spain
| | - Manuel Arrobas
- Servicio de Nefrología Hospital Universitario Infanta Cristina Badajoz, Spain
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6
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Saran R, Goel S, Stack A, Prowant B, Moore H, Nolph KD, Khanna R. Serum Insulin-Like Growth Factor I Levels Do Not Correlate with Residual Renal Function in Dialysis Patients. Perit Dial Int 2020. [DOI: 10.1177/089686080102100517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Rajiv Saran
- Division of Nephrology, University of Michigan Ann Arbor, Michigan, U.S.A
- Department of Internal Medicine and The Dalton Cardiovascular Center University of Missouri Columbia, Missouri Division of Nephrology University of Michigan Ann Arbor, Michigan, U.S.A
| | - Sharad Goel
- Division of Nephrology, University of Michigan Ann Arbor, Michigan, U.S.A
| | - Austin Stack
- Department of Internal Medicine and The Dalton Cardiovascular Center University of Missouri Columbia, Missouri Division of Nephrology University of Michigan Ann Arbor, Michigan, U.S.A
| | - Barbara Prowant
- Division of Nephrology, University of Michigan Ann Arbor, Michigan, U.S.A
| | - Harold Moore
- Division of Nephrology, University of Michigan Ann Arbor, Michigan, U.S.A
| | - Karl D. Nolph
- Division of Nephrology, University of Michigan Ann Arbor, Michigan, U.S.A
| | - Ramesh Khanna
- Division of Nephrology, University of Michigan Ann Arbor, Michigan, U.S.A
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7
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Brown EA, Davies SJ, Heimbürger O, Meeus F, Mellotte G, Rosman J, Rutherford P, Van Bree M, Borras M, Brown E, Caillette–Beaudoin A, Clutterbuck E, Davies S, D'Auzac C, Ekstrand A, Frandsen N, Freida P, Heimbürger O, Kuypers+ D, Gasthuisberg+ A, Mactier R, MacNamara E, Malmsten G, Mastrangelo F, Meeus F, Melotte G, Perez–Contreras J, Riegel W, Rodrigues A, Rodriguez–Carmona A, Rosman J, Rutherford P, Scanziani R, Vega Diaz N, Vychytil A, Weinreich T. Adequacy Targets Can be Met in Anuric Patients by Automated Peritoneal Dialysis: Baseline Data from Eapos. Perit Dial Int 2020. [DOI: 10.1177/089686080102103s19] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
♦ Objective Conventional continuous ambulatory peritoneal dialysis (CAPD) in patients without residual renal function and with high solute transport is associated with worse clinical outcomes. Automated peritoneal dialysis (APD) has the potential to improve both solute clearance and ultrafiltration in these circumstances, but its efficacy as a treatment modality is unknown. The European Automated Peritoneal Dialysis Outcomes Study (EAPOS) is a 2-year, prospective, European multi-center study designed to determine APD feasibility and clinical outcomes in anuric patients. The present article describes the baseline data for patients recruited into the study. ♦ Design All PD patients treated in the participating centers were screened for inclusion criteria [urinary output < 100 mL/24 h, or residual renal function (RRF) < 1 mL/min, or both]. After enrollment, changes were made to the dialysis prescription to achieve a weekly creatinine clearance above 60 L per 1.73 m2 and an ultrafiltration rate above 750 mL in 24 hours. ♦ Setting The study is being conducted in 26 dialysis centers in 13 European countries. ♦ Baseline Data Collection The information collected includes patient demographics, dialysis prescription, achieved weekly creatinine clearance, and 24-hour ultra-filtration (UF). ♦ Results The study enrolled 177 anuric patients. Median dialysis duration before enrollment was 22.5 months (range: 0 – 285 months). Mean solute transport measured as the dialysate-to-plasma ratio of creatinine (D/PCr) was 0.74 ± 0.12. Patients received APD for a median of 9.0 hours overnight (range: 7 – 12 hours) using a median of 11.0 L of fluid (range: 6 – 28.75 L). Median daytime volume was 4.0 L (range: 0.0 – 9.0 L). Tidal dialysis was used in 26 patients, and icodextrin in 86 patients. At baseline, before treatment optimization, the weekly mean total creatinine clearance was 65.2 ± 14.4 L/1.73 m2, with 105 patients (60%) achieving the target of more than 60 L/1.73 m2. At baseline, 81% of patients with high transport, 69% with high-average transport, and 40% with low-average transport met the target. At baseline, 70% of patients with a body surface area (BSA) below 1.7 m2, 60% with a BSA of 1.7 – 2.0 m2, and 56% with a BSA above 2.0 m2 achieved 60 L/1.73 m2 weekly. Median UF was 1090 mL/24 h, and 75% of patients achieved the UF target of more than 750 mL/24 h. ♦ Conclusion This baseline analysis of anuric patients recruited into the EAPOS study demonstrates that a high proportion of anuric patients on APD can achieve dialysis and ultrafiltration targets using a variety of regimes. This 2-year follow-up study aims to optimize APD prescription to reach predefined clearance and ultrafiltration targets, and to observe the resulting clinical outcomes.
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Affiliation(s)
| | | | | | | | | | | | | | | | - M. Borras
- Hospital Amau de Vilanova, Lerida, Spain
| | - E. Brown
- Charing Cross Hospital, London, U.K
| | | | | | - S. Davies
- North Staffordshire Hospital, Stoke-on-Trent, U.K
| | - C. D'Auzac
- Hôpital Européen Georges Pompidou, Paris, France
| | - A. Ekstrand
- Helsinki University Hospital, Helsinki, Finland
| | | | - P. Freida
- Centre Hospitalier Louis Pasteur, Cherbourg, France
| | | | | | | | - R. Mactier
- Stobhill Hospital NHS Trust, Glasgow, Scotland, U.K
| | - E. MacNamara
- Centre Hospitalier Germon et Gauthier, Bethune, France
| | - G. Malmsten
- Orebro Medical Center Hospital, Orebro, Sweden
| | | | - F. Meeus
- Centre Hospitalier Louise Michel Evry, Evry, France
| | | | | | - W. Riegel
- Klinikum Darmstadt, Darmstadt, Germany
| | | | | | - J. Rosman
- Westeinde Hospital, The Hague, Netherlands
| | | | | | - N. Vega Diaz
- Hospital Nuestra Senora del Pino, Las Palmas, Spain
| | - A. Vychytil
- Universitat Klinik für Innere Medezin III, Vienna, Austria
| | - T. Weinreich
- Dialyse Institüt Villingen– Schwenningen, Schwenningen, Germany
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8
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Venkataraman V, Nolph KD. Preservation of Residual Renal Function — An Important Goal. Perit Dial Int 2020. [DOI: 10.1177/089686080002000405] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Vijaya Venkataraman
- Division of Nephrology University of Missouri–Columbia Columbia, Missouri, U.S.A
| | - Karl D. Nolph
- Division of Nephrology University of Missouri–Columbia Columbia, Missouri, U.S.A
- Department of Internal Medicine and Dalton Cardiovascular Research Center University of Missouri–Columbia Columbia, Missouri, U.S.A
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9
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Ricardo AC, Yang W, Sha D, Appel LJ, Chen J, Krousel-Wood M, Manoharan A, Steigerwalt S, Wright J, Rahman M, Rosas SE, Saunders M, Sharma K, Daviglus ML, Lash JP. Sex-Related Disparities in CKD Progression. J Am Soc Nephrol 2018; 30:137-146. [PMID: 30510134 DOI: 10.1681/asn.2018030296] [Citation(s) in RCA: 140] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 11/07/2018] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND In the United States, incidence of ESRD is 1.5 times higher in men than in women, despite men's lower prevalence of CKD. Prior studies, limited by inclusion of small percentages of minorities and other factors, suggested that men have more rapid CKD progression, but this finding has been inconsistent. METHODS In our prospective investigation of sex differences in CKD progression, we used data from 3939 adults (1778 women and 2161 men) enrolled in the Chronic Renal Insufficiency Cohort Study, a large, diverse CKD cohort. We evaluated associations between sex (women versus men) and outcomes, specifically incident ESRD (defined as undergoing dialysis or a kidney transplant), 50% eGFR decline from baseline, incident CKD stage 5 (eGFR<15 ml/min per 1.73 m2), eGFR slope, and all-cause death. RESULTS Participants' mean age was 58 years at study entry; 42% were non-Hispanic black, and 13% were Hispanic. During median follow-up of 6.9 years, 844 individuals developed ESRD, and 853 died. In multivariable regression models, compared with men, women had significantly lower risk of ESRD, 50% eGFR decline, progression to CKD stage 5, and death. The mean unadjusted eGFR slope was -1.09 ml/min per 1.73 m2 per year in women and -1.43 ml/min per 1.73 m2 per year in men, but this difference was not significant after multivariable adjustment. CONCLUSIONS In this CKD cohort, women had lower risk of CKD progression and death compared with men. Additional investigation is needed to identify biologic and psychosocial factors underlying these sex-related differences.
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Affiliation(s)
- Ana C Ricardo
- Department of Medicine, Institute for Minority Health Research, University of Illinois at Chicago, Chicago, Illinois;
| | - Wei Yang
- Departments of Medicine and Epidemiology and Biostatistics, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Daohang Sha
- Departments of Medicine and Epidemiology and Biostatistics, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Lawrence J Appel
- Department of Medicine, Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins University, Baltimore, Maryland
| | - Jing Chen
- Departments of Medicine and.,Epidemiology, Tulane University, New Orleans, Louisiana
| | - Marie Krousel-Wood
- Departments of Medicine and.,Epidemiology, Tulane University, New Orleans, Louisiana
| | - Anjella Manoharan
- Department of Medicine, Institute for Minority Health Research, University of Illinois at Chicago, Chicago, Illinois
| | | | - Jackson Wright
- Department of Medicine, Case Western University, University Hospitals Case Medical Center, Cleveland, Ohio
| | - Mahboob Rahman
- Department of Medicine, Case Western University, University Hospitals Case Medical Center, Cleveland, Ohio
| | - Sylvia E Rosas
- Department of Medicine, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
| | - Milda Saunders
- Department of Medicine, University of Chicago, Chicago, Illinois; and
| | - Kumar Sharma
- Department of Medicine, University of California, San Diego, California
| | - Martha L Daviglus
- Department of Medicine, Institute for Minority Health Research, University of Illinois at Chicago, Chicago, Illinois
| | - James P Lash
- Department of Medicine, Institute for Minority Health Research, University of Illinois at Chicago, Chicago, Illinois
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10
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Tzamaloukas A, Murata G, Malhotra D. Renal Clearances in Continuous Ambulatory Peritoneal Dialysis: Differences between Diabetic and Non-Diabetic Subjects. Int J Artif Organs 2018. [DOI: 10.1177/039139880102400406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We analyzed the effect of diabetes on the decline of residual renal function during the course of CAPD in a cross-sectional study including 105 diabetic subjects (41 women) who had 207 clearance studies and 125 non-diabetic subjects (50 women, 265 clearance studies). CAPD duration was 11.5±10.5 months in the diabetic group (DG) and 16.8±18.6 months in the non-diabetic group (NDG, P < 0.001). The DG had lower urine volume than the NDG (0.52±0.46 vs 0.61±0.50 L/24-h, P < 0.05), while urine-to-plasma concentration ratio was higher in the DG for creatinine (13.5±9.4 vs 11.5±11.0, P <0.05) and did not differ for urea. Weekly renal Kt/V urea (DG 0.51±0.57, NDG 0.53±0.49) and Ccr (DG 31.0±28.7 NDG 29.3±26.5 L/1.73 m2) did not differ. The slopes of the regressions of CAPD duration on renal clearances did not differ. These regressions allowed estimates of the time, from the onset of CAPD, at which renal clearances become negligible. These estimates differed for both urea clearance (DG 35.3, NDG 50.5 months) and creatinine clearance (DG 43.2, NDG 57.6 months). The slope of the regression of renal urea clearance on renal creatinine clearance was steeper in the DG, suggesting a higher renal creatinine clearance in the DG than in the NDG when renal urea clearance is the same in the two groups. Subtle differences in the rate of decline of renal function can be detected between diabetic and non-diabetic subjects on CAPD by detailed statistical analysis. These findings are supportive of the studies which have identified diabetes mellitus as a predictor of loss of residual renal function during the course of CAPD. In addition, the relationship between the renal urea and creatinine clearances differs between diabetic and non-diabetic subjects on CAPD. Therefore, the dose of CAPD required for adequate total clearances may differ between diabetic and non-diabetic subjects.
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Affiliation(s)
- A.H. Tzamaloukas
- Nephrology Section, New Mexico VA Health Care System and University of New Mexico, Albuquerque, New Mexico - USA
| | - G.H. Murata
- General Internal Medicine Section, New Mexico VA Health Care System and University of New Mexico, Albuquerque, New Mexico - USA
| | - D. Malhotra
- Division of Nephrology, Medical College of Ohio, Toledo, Ohio - USA
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11
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Shou H, Hsu JY, Xie D, Yang W, Roy J, Anderson AH, Landis JR, Feldman HI, Parsa A, Jepson C. Analytic Considerations for Repeated Measures of eGFR in Cohort Studies of CKD. Clin J Am Soc Nephrol 2017; 12:1357-1365. [PMID: 28751576 PMCID: PMC5544518 DOI: 10.2215/cjn.11311116] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Repeated measures of various biomarkers provide opportunities for us to enhance understanding of many important clinical aspects of CKD, including patterns of disease progression, rates of kidney function decline under different risk factors, and the degree of heterogeneity in disease manifestations across patients. However, because of unique features, such as correlations across visits and time dependency, these data must be appropriately handled using longitudinal data analysis methods. We provide a general overview of the characteristics of data collected in cohort studies and compare appropriate statistical methods for the analysis of longitudinal exposures and outcomes. We use examples from the Chronic Renal Insufficiency Cohort Study to illustrate these methods. More specifically, we model longitudinal kidney outcomes over annual clinical visits and assess the association with both baseline and longitudinal risk factors.
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Affiliation(s)
- Haochang Shou
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Jesse Y. Hsu
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Dawei Xie
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Wei Yang
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Jason Roy
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Amanda H. Anderson
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - J. Richard Landis
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Harold I. Feldman
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Afshin Parsa
- Department of Medicine, Division of Nephrology, University of Maryland School of Medicine, Baltimore, Maryland; and
- Department of Medicine, Baltimore Veterans Affairs Medical Center, Baltimore, Maryland
| | - Christopher Jepson
- Department of Biostatistics, Epidemiology and Informatics and
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
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12
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Lee CP, Chertow GM, Zenios SA. A Simulation Model to Estimate the Cost and Effectiveness of Alternative Dialysis Initiation Strategies. Med Decis Making 2016; 26:535-49. [PMID: 16997929 DOI: 10.1177/0272989x06290488] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background. Patients with end-stage renal disease (ESRD) require dialysis to maintain survival. The optimal timing of dialysis initiation in terms of cost-effectiveness has not been established.Methods . We developed a simulation model of individuals progressing towards ESRD and requiring dialysis. It can be used to analyze dialysis strategies and scenarios. It was embedded in an optimization frame worked to derive improved strategies.Results. Actual (historical) and simulated survival curves and hospitalization rates were virtually indistinguishable. The model overestimated transplantation costs (10%) but it was related to confounding by Medicare coverage. To assess the model's robustness, we examined several dialysis strategies while input parameters were perturbed. Under all 38 scenarios, relative rankings remained unchanged. An improved policy for a hypothetical patient was derived using an optimization algorithm.Conclusion. The model produces reliable results and is robust. It enables the cost-effetiveness analysis of dialysis strategies.
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Affiliation(s)
- Chris P Lee
- Operations and Information Management Department, The Wharton School, University of Pennsylvania, PA, USA
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13
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Boucquemont J, Heinze G, Jager KJ, Oberbauer R, Leffondre K. Regression methods for investigating risk factors of chronic kidney disease outcomes: the state of the art. BMC Nephrol 2014; 15:45. [PMID: 24628838 PMCID: PMC4004351 DOI: 10.1186/1471-2369-15-45] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 02/20/2014] [Indexed: 11/23/2022] Open
Abstract
Background Chronic kidney disease (CKD) is a progressive and usually irreversible disease. Different types of outcomes are of interest in the course of CKD such as time-to-dialysis, transplantation or decline of the glomerular filtration rate (GFR). Statistical analyses aiming at investigating the association between these outcomes and risk factors raise a number of methodological issues. The objective of this study was to give an overview of these issues and to highlight some statistical methods that can address these topics. Methods A literature review of statistical methods published between 2002 and 2012 to investigate risk factors of CKD outcomes was conducted within the Scopus database. The results of the review were used to identify important methodological issues as well as to discuss solutions for each type of CKD outcome. Results Three hundred and four papers were selected. Time-to-event outcomes were more often investigated than quantitative outcome variables measuring kidney function over time. The most frequently investigated events in survival analyses were all-cause death, initiation of kidney replacement therapy, and progression to a specific value of GFR. While competing risks were commonly accounted for, interval censoring was rarely acknowledged when appropriate despite existing methods. When the outcome of interest was the quantitative decline of kidney function over time, standard linear models focussing on the slope of GFR over time were almost as often used as linear mixed models which allow various numbers of repeated measurements of kidney function per patient. Informative dropout was accounted for in some of these longitudinal analyses. Conclusions This study provides a broad overview of the statistical methods used in the last ten years for investigating risk factors of CKD progression, as well as a discussion of their limitations. Some existing potential alternatives that have been proposed in the context of CKD or in other contexts are also highlighted.
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Affiliation(s)
| | | | | | | | - Karen Leffondre
- University of Bordeaux, ISPED, Centre INSERM U897-Epidemiology-Biostatistics, Bordeaux F33000, France.
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14
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Kjaergaard KD, Jensen JD, Peters CD, Jespersen B. Preserving residual renal function in dialysis patients: an update on evidence to assist clinical decision making. NDT Plus 2011; 4:225-30. [PMID: 25949486 PMCID: PMC4421450 DOI: 10.1093/ndtplus/sfr035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 02/28/2011] [Indexed: 12/29/2022] Open
Abstract
It has been documented that preservation of residual renal function in dialysis patients improves quality of life as well as survival. Clinical trials on strategies to preserve residual renal function are clearly lacking. While waiting for more results from clinical trials, patients will benefit from clinicians being aware of available knowledge. The aim of this review was to offer an update on current evidence assisting doctors in clinical practice.
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Affiliation(s)
- Krista Dybtved Kjaergaard
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark ; Institute of Clinical Medicine, Faculty of Health Sciences, Aarhus University, Aarhus, Denmark
| | - Jens Dam Jensen
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark ; Institute of Clinical Medicine, Faculty of Health Sciences, Aarhus University, Aarhus, Denmark
| | - Christian Daugaard Peters
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark ; Institute of Clinical Medicine, Faculty of Health Sciences, Aarhus University, Aarhus, Denmark
| | - Bente Jespersen
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark ; Institute of Clinical Medicine, Faculty of Health Sciences, Aarhus University, Aarhus, Denmark
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15
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Davies SJ. Preserving residual renal function in peritoneal dialysis: volume or biocompatibility? Nephrol Dial Transplant 2009; 24:2620-2. [DOI: 10.1093/ndt/gfp313] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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16
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17
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Canaud B, Chenine L, Henriet D, Leray Moragues H, Cristol JP. Rôle de la fonction rénale résiduelle dans la balance sodée du dialysé : est-ce un bénéfice ou un risque ? Nephrol Ther 2007; 3 Suppl 2:S126-32. [DOI: 10.1016/s1769-7255(07)80020-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Canaud B, Chenine L, Leray-Moragués H, Wiesen H, Tetta C. Residual renal function and dialysis modality: Is it really beneficial to preserve residual renal function in dialysis patients? (Review Article). Nephrology (Carlton) 2006; 11:292-6. [PMID: 16889567 DOI: 10.1111/j.1440-1797.2006.00595.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Residual renal function (RRF) contributes to the achievement of treatment adequacy in stage 5 chronic kidney disease (CKD-5) patients. It may facilitate patients' acceptance of renal replacement therapy (RRT) in allowing reduction of treatment time duration and minimising dietary and fluid restriction. It has been confirmed to improve dialysis patient outcomes. Attempts to preserve RRF in incident Stage 5 chronic kidney disease patients are still subject to intense controversies in the nephrology community. The aim of this review is to analyse the role of renal replacement modalities in the maintenance of RRF in dialysis patients. Under the scope of this manuscript, four questions are explored: Is the preservation of residual renal function an objective for dialysis adequacy? Does dialysis modality affect the decline of RRF? What are the factors implicated by this loss of RRF? At what expense can the maintenance of RRF be achieved in dialysis patients? Preservation of RRF is undoubtedly an interesting means to enhance the efficacy of renal replacement therapy and reduce dietary fluid restriction but it should not be considered as a goal of dialysis adequacy in dialysis patients. Further, preservation of RRF must be considered as a permanent trade-off between patient comfort and chronic fluid volume overload.
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Affiliation(s)
- Bernard Canaud
- Nephrology, Dialysis and Intensive Care Unit, Lapeyronie University Hospital, Montpellier, France.
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19
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Bargman JM, Golper TA. The importance of residual renal function for patients on dialysis. Nephrol Dial Transplant 2005; 20:671-3. [PMID: 15755759 DOI: 10.1093/ndt/gfh723] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Joanne M Bargman
- University Health Network, 200 Elizabeth Street, Toronto, Ontario M5G 2C4, Canada.
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20
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Hidaka H, Nakao T. Preservation of residual renal function and factors affecting its decline in patients on peritoneal dialysis. Nephrology (Carlton) 2003; 8:184-91. [PMID: 15012719 DOI: 10.1046/j.1440-1797.2003.00156.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The decline of residual renal function (RRF) in peritoneal dialysis (PD) patients was analysed and assessed, and risk factors affecting its decline were identified. Residual glomerular filtration rate (GFR) was calculated from averaging the urea and creatinine clearance by 24-h urine collection, and peritoneal solute removal was evaluated by creatinine clearance calculated from 24-h effluent collection. Both GFR and peritoneal solute removal were chronologically examined in 34 PD patients from the time of initiation, and risk factors associated with rapid GFR decline were investigated. The RRF contributed to 43.1 +/- 17.6% of total (peritoneal and renal) weekly creatinine clearance at 1 month after initiation of PD. Residual GFR, however, declined continuously with time (-0.19 +/- 0.14 mL/min per month), and the reduction rate was high with a higher GFR, higher normalized dietary protein intake, higher urine volume and higher urine protein excretion at the initiation of PD. Other factors related to the rapid decline of GFR were: being older than 60 years of age, automated peritoneal dialysis (APD) rather than continuous ambulatory peritoneal dialysis, mean blood pressure higher than 110 mmHg, and serum human atrial natriuretic peptide level higher being than 60 pg/dL. These data suggest that while RRF plays an important role in the removal of uraemic solute in PD patients, they show a significant decrease over 2 years. The factors related to the rapid decline of GFR corresponded to older age, modality of PD (APD), higher GFR and higher amount of urine protein at initiation, higher dietary protein intake, and inadequate control of hypertension and body fluid volume.
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Affiliation(s)
- Hiromi Hidaka
- Department of Nephrology, Tokyo Medical University, 6-7-1 Nishi-shinjuku, Shinjuku-ku, Tokyo 160-0023, Japan
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21
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Jansen MAM, Hart AAM, Korevaar JC, Dekker FW, Boeschoten EW, Krediet RT. Predictors of the rate of decline of residual renal function in incident dialysis patients. Kidney Int 2002; 62:1046-53. [PMID: 12164889 DOI: 10.1046/j.1523-1755.2002.00505.x] [Citation(s) in RCA: 354] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Residual renal function (RRF) influences morbidity, mortality and quality of life in chronic dialysis patients. Few studies have been published on risk factors for loss of RRF in dialysis patients. These studies were either retrospective, performed in a small number of patients, or estimated GFR without a urine collection. METHODS We analyzed the decline rates of residual GFR (rGFR) prospectively in 522 incident HD and PD patients who had structured follow-up assessments. GFR was measured as the mean of urea and creatinine clearance, calculated from urine collections. The initial value was obtained 0 to 4 weeks before the start of dialysis. The measurements were repeated 3, 6, and 12 months after the start of dialysis treatment. After logarithmic transformation, differences in rGFR changes over time were analyzed using repeated measurement analysis of variance. RESULTS Baseline factors that were negatively associated with rGFR at 12 months were a higher diastolic blood pressure (P < 0.001) and a higher urinary protein loss (P < 0.001). Primary kidney disease did not affect rGFR. Averaged over time, PD patients had a higher rGFR (P < 0.001) than HD patients. This relative difference increased over time (P = 0.04). Investigation of possible effects of the dialysis procedure on the decline rate between 0 and three months showed that dialysis hypotension (P = 0.02) contributed to the decline in HD and the presence of episodes with dehydration contributed in PD (P = 0.004). CONCLUSIONS rGFR is better maintained in PD patients than in HD patients. The associated factors such as a higher diastolic blood pressure, proteinuria, dialysis hypotension and dehydration can either be treated or avoided.
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Affiliation(s)
- Maarten A M Jansen
- Division of Nephrology, Department of Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
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22
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Beddhu S, Zeidel ML, Saul M, Seddon P, Samore MH, Stoddard GJ, Bruns FJ. The effects of comorbid conditions on the outcomes of patients undergoing peritoneal dialysis. Am J Med 2002; 112:696-701. [PMID: 12079709 DOI: 10.1016/s0002-9343(02)01097-5] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE Dialysis patients frequently have comorbid conditions. We examined the effects of age and comorbid conditions on technique failure (i.e., transfer to hemodialysis), death, hospital costs, and kidney transplantation in patients treated with peritoneal dialysis. METHODS We studied 97 patients who began peritoneal dialysis from January 1, 1993, to December 31, 1998, at the University of Pittsburgh outpatient dialysis unit. Demographic characteristics, comorbid conditions, and outcomes were determined by reviewing the Medical Archival Retrieval System database and outpatient records. Because the comorbidity (Charlson) score was colinear with age, we used a modified version of the score without an age component. Low, moderate, and high comorbidity groups were defined based on the 33rd and 66th percentiles of the comorbidity score. RESULTS In multivariate-adjusted models, each decade increase in age was associated with an increased risk of death (hazard ratio [HR] = 1.7; 95% confidence interval [CI]: 1.1 to 2.5) and technique failure (HR = 1.5; 95% CI: 1.0 to 2.3). High (versus low) comorbidity was associated with an increased risk of death or technique failure (HR = 3.5; 95% CI: 1.0 to 12) and significantly higher average inpatient costs. There were no differences in age or comorbidity score between patients who transferred to hemodialysis and those who died. CONCLUSION Patients who are older and more ill have a greater risk of death and of transfer to hemodialysis from peritoneal dialysis.
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Affiliation(s)
- Srinivasan Beddhu
- Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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23
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McKane W, Chandna SM, Tattersall JE, Greenwood RN, Farrington K. Identical decline of residual renal function in high-flux biocompatible hemodialysis and CAPD. Kidney Int 2002; 61:256-65. [PMID: 11786108 DOI: 10.1046/j.1523-1755.2002.00098.x] [Citation(s) in RCA: 115] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Patients on conventional hemodialysis lose residual renal function more rapidly than patients on continuous ambulatory peritoneal dialysis (CAPD). The effect of dialysis using synthetic membranes and ultrapure water is less clear. METHODS The decline of urea clearance was compared in a cohort of 475 incident end-stage renal failure patients who received treatment with CAPD (N=175) or hemodialysis (HD) utilizing high-flux polysulphone membranes, ultrapure water, and bicarbonate as the buffer (N=300). RESULTS CAPD patients were significantly younger, fitter (lower comorbidity severity score), less dependent (higher Karnofsky performance score) and less likely to have presented late than HD patients. There was no difference in the mean urea clearance in each group at dialysis initiation, or at any 6-month time point during the ensuing 48 months. This was true even after exclusion of patients who had died in the first year after initiation, those transferred to another dialysis modality, or those who had been transplanted. Only age and chronic interstitial disease predicted retention of urea clearance at one year. The rate of decline of urea clearance was similar in pre- and post-dialysis initiation phases, though there may have been a step-decline of about 2 mL/min at initiation, which requires further investigation. CONCLUSIONS In hemodialysis using high-flux biocompatible membranes and ultrapure water, residual renal function declines at a rate indistinguishable from that in CAPD. This may have important implications, since preservation of residual renal function has major benefits and is a valid therapeutic goal.
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Affiliation(s)
- Will McKane
- Lister Renal Unit Stevenage, and Renal Unit, Northern General Hospital, Sheffield, England, United Kingdom
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24
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Vogt B, Ferrari P, Schönholzer C, Marti HP, Mohaupt M, Wiederkehr M, Cereghetti C, Serra A, Huynh-Do U, Uehlinger D, Frey FJ. Prophylactic hemodialysis after radiocontrast media in patients with renal insufficiency is potentially harmful. Am J Med 2001; 111:692-8. [PMID: 11747848 DOI: 10.1016/s0002-9343(01)00983-4] [Citation(s) in RCA: 208] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE Acute renal failure induced by contrast media is an important cause of hospital-acquired renal insufficiency. Preexisting renal failure and the dose of contrast media are known risk factors for the development of radiocontrast nephropathy. We performed a randomized trial to test whether radiocontrast nephropathy can be avoided by prophylactic hemodialysis immediately after the administration of contrast media in patients with impaired renal function. SUBJECTS AND METHODS Renal function and other parameters, hemodialysis requirement, and relevant clinical events were recorded before and during the 6 days after administration of contrast media in 113 patients with a baseline serum creatinine level >200 microm/L (>2.3 mg/dL). Patients were randomly assigned to either hemodialysis (n = 55) or nonhemodialysis (n = 58) treatment after parenteral low-osmolality contrast media. RESULTS The characteristics of the patients in the two groups were similar. Compared with baseline levels, the mean [+/- SD] serum creatinine level decreased at day 1 (277 +/- 95 microm/L), peaked at day 4 (353 +/- 126 microm/L), and returned to baseline at day 6 (327 +/- 119 microm/L, P <0.05 by analysis of variance) after administration of contrast media in the hemodialysis group, whereas in the nonhemodialysis group, no significant changes in mean serum creatinine level were observed. Eleven patients required 1 or more hemodialyses (8 in the hemodialysis group and 3 in the nonhemodialysis group, P = 0.12), 6 of whom (4 vs. 2, P = 0.44) required 3 or more hemodialyses. Clinically relevant events included pulmonary edema (1 vs. 4 patients, P = 0.36), myocardial infarction (2 vs. 2), stroke (2 vs. 0, P = 0.24), and death (1 vs. 1). CONCLUSIONS The strategy of performing hemodialysis immediately after the administration of low-osmolality contrast media in all patients with a reduced renal function did not diminish the rate of complications, including radiocontrast nephropathy.
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Affiliation(s)
- B Vogt
- University Hospital of Berne, Berne, Switzerland
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25
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Bargman JM, Thorpe KE, Churchill DN. Relative contribution of residual renal function and peritoneal clearance to adequacy of dialysis: a reanalysis of the CANUSA study. J Am Soc Nephrol 2001; 12:2158-2162. [PMID: 11562415 DOI: 10.1681/asn.v12102158] [Citation(s) in RCA: 614] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Studies of the adequacy of peritoneal dialysis and recommendations have assumed that renal and peritoneal clearances are comparable and therefore additive. The CANUSA data were reanalyzed in an effort to address this assumption. Among the 680 patients in the original CANUSA study, 601 had all of the variables of interest for this report. Adequacy of dialysis was estimated from GFR (mean of renal urea and creatinine clearance) and from peritoneal creatinine clearance. The Cox proportional-hazards model was used to evaluate the time-dependent association of these independent variables with patient survival. For each 5 L/wk per 1.73 m(2) increment in GFR, there was a 12% decrease in the relative risk (RR) of death (RR, 0.88; 95% confidence interval [CI], 0.83 to 0.94) but no association with peritoneal creatinine clearance (RR, 1.00; 95% CI, 0.90 to 1.10). Estimates of fluid removal (24-h urine volume, net peritoneal ultrafiltration, and total fluid removal) then were added to the Cox model. For a 250-ml increment in urine volume, there was a 36% decrease in the RR of death (RR, 0.64; 95% CI, 0.51 to 0.80). The association of patient survival with GFR disappeared (RR, 0.99; 95% CI, 0.94 to 1.04). However, neither net peritoneal ultrafiltration nor total fluid removal was associated with patient survival. Although these results may be explained partly, statistically, by less variability in peritoneal clearance than in GFR, the latter seems to be physiologically more important than the former. The assumption of equivalence of peritoneal and renal clearances is not supported by these data. Recommendations for adequate peritoneal dialysis need to be reevaluated in light of these observations.
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Affiliation(s)
- Joanne M Bargman
- Division of Nephrology, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Kevin E Thorpe
- Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | - David N Churchill
- Father Sean O'Sullivan Research Center, St. Joseph's Hospital, Division of Nephrology, McMaster University, Hamilton, Ontario, Canada
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Misra M, Vonesh E, Van Stone JC, Moore HL, Prowant B, Nolph KD. Effect of cause and time of dropout on the residual GFR: a comparative analysis of the decline of GFR on dialysis. Kidney Int 2001; 59:754-63. [PMID: 11168959 DOI: 10.1046/j.1523-1755.2001.059002754.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND The decline of residual renal function (RRF) on dialysis has been reported to be slower in peritoneal dialysis (PD) then hemodialysis (HD). However, some clinicians have questioned whether this reported difference might not be caused by selection bias. In particular, if continuous ambulatory PD (CAPD) delivers only marginally adequate therapy as some clinicians speculate, then perhaps those patients on CAPD with low glomerular filtration rate (GFR) are purposefully switched to HD. If true, transferring CAPD patients with low GFR to HD could create a selection bias that very well may account for the differences in GFR between PD and HD. This is particularly problematic if one then censors patients at the time of transfer from PD to HD from analysis (that is, patients are no longer followed in the study once they have switched treatment modalities). When this occurs, the data are said to be informatively censored, a term used by statisticians to describe any kind of systematic bias associated with censored or incomplete data. In particular, informative censoring occurs when patients who die or transfer to another modality very early have an associated lower starting GFR or higher rate of decline of GFR than patients who either complete the study or who die or transfer much later. If patient dropout is indeed related to the rate of decline in GFR and if this relationship differs between PD and HD but is ignored in the analysis, then the results of such analysis may be biased. METHODS This article analyzes the decline in GFR among 141 incident dialysis patients (39 HD and 102 PD) undergoing either HD or PD at the University of Missouri-Columbia. The decline in GFR was modeled as a nonlinear function of time, taking into account the possibility that missing values of GFR may be associated with patient dropout (death, transfer to another modality, or transplantation). To safeguard against this possibility, we utilized a conditional nonlinear mixed-effects model. The model was used to fit and compare each patient's GFR data to time adjusting for the patient's treatment modality (HD vs. PD), cause of dropout (death, transfer, transplant, lost to follow-up/study ended), and time to dropout. The model allowed a comparison of the starting GFR and the rate of decline in GFR between PD and HD adjusting for these three factors. RESULTS AND CONCLUSIONS The results of our analysis suggest that such informative censoring is independent of treatment modality and that even after correcting for dropout caused by death or transfer to another modality, patients starting on PD have a lower rate of decline in GFR (that is, better preservation of GFR) than patients starting on HD.
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Affiliation(s)
- M Misra
- Division of Nephrology, University of Missouri Health Sciences Center, Columbia, Missouri 65212, USA
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Passadakis P, Oreopoulos D. Peritoneal dialysis in diabetic patients. ADVANCES IN RENAL REPLACEMENT THERAPY 2001; 8:22-41. [PMID: 11172325 DOI: 10.1053/jarr.2001.21704] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Diabetes mellitus is the fastest growing cause of end-stage renal disease (ESRD) and has become the leading cause of such ESRD worldwide. In the United States, between 1984 and 1997, the proportion of new patients starting renal replacement therapies whose ESRD was caused by diabetes increased from 27% to 44.4%. Canada saw an increase from 16.5% in 1984 to 28.9% in 1997, and many European countries had similar increases. Among the modes of renal replacement, many clinicians have favored continuous ambulatory peritoneal dialysis (CAPD) for the treatment of diabetic ESRD for several reasons. Many studies have compared clinical outcomes in diabetic patients undergoing CAPD, and nondiabetic patients undergoing CAPD, or diabetic patients undergoing peritoneal dialysis (PD) and those undergoing hemodialysis (HD). However, only a small number of diabetic dialysis patients have been followed up for more than 5 years, largely because of the presence of several comorbid conditions at the start of dialysis and the coexistence of far-advanced target-organ damage at dialysis initiation and its progression during the course of dialysis. Diabetic patients undergoing PD and HD probably have similar survival, and those undergoing CAPD have lower survival and technique success rates than nondiabetic patients of comparable age. This article reviews the literature and our experience with diabetic patients undergoing PD and compares clinical outcomes in diabetic patients undergoing PD and HD.
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Affiliation(s)
- P Passadakis
- Department of Nephrology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
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