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Review

Guidelines for the management of chronic kidney disease

Adeera Levin, Brenda Hemmelgarn, Bruce Culleton, Sheldon Tobe, Philip McFarlane, Marcel Ruzicka, Kevin Burns, Braden Manns, Colin White, Francoise Madore, Louise Moist, Scott Klarenbach, Brendan Barrett, Robert Foley, Kailash Jindal, Peter Senior, Neesh Pannu, Sabin Shurraw, Ayub Akbari, Adam Cohn, Martina Reslerova, Vinay Deved, David Mendelssohn, Gihad Nesrallah, Joanne Kappel, Marcello Tonelli and ; for the Canadian Society of Nephrology
CMAJ November 18, 2008 179 (11) 1154-1162; DOI: https://doi.org/10.1503/cmaj.080351
Adeera Levin MD
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Brenda Hemmelgarn MD PhD
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Bruce Culleton MD MSc
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Sheldon Tobe MD
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Philip McFarlane MD PhD
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Marcel Ruzicka MD PhD
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Kevin Burns MD
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Braden Manns MD MSc
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Colin White MD
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Francoise Madore MD MSc
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Louise Moist MD MSc
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Scott Klarenbach MD MSc
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Brendan Barrett MD MSc
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Robert Foley MD MSc
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Kailash Jindal MD
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Peter Senior MBBS PhD
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Neesh Pannu MD MSc
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Sabin Shurraw MD
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Ayub Akbari MD
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Adam Cohn MD
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Martina Reslerova MD PhD
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Vinay Deved MD
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David Mendelssohn MD
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Gihad Nesrallah MD
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Joanne Kappel MD
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Marcello Tonelli MD SM
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  • © 2008 Canadian Medical Association

New guidelines for the management of chronic kidney disease have been developed by the Canadian Society of Nephrology (Appendix 1 contains the full-text guidelines; available at www.cmaj.ca/cgi/content/full/179/11/1154/DC1). These guidelines describe key aspects of the management of chronic kidney disease to facilitate shared care for these patients by general practitioners and specialists, including internists, endocrinologists, cardiologists and nephrologists. Specifically, these guidelines are for the care of patients who are not receiving dialysis. In this review, we outline recommendations from the guidelines on aspects of management of chronic kidney disease, including targets for various abnormalities, strategies for treatment and the frequency of follow-up based on the evidence available.

Chronic kidney disease is estimated to affect between 1.9 million and 2.3 million Canadians. It constitutes a major public health problem.1 Chronic kidney disease often coexists with cardiovascular disease and diabetes and is recognized as a risk factor for all-cause mortality and cardiovascular disease.2–4

The definition of chronic kidney disease has been simplified over the last 5 years. It is now defined as the presence of kidney damage for a period greater than 3 months. An estimated or measured glomerular filtration rate of less than 60 mL/min/1.73 m2 is considered abnormal for all adults. A rate of more than 60 mL/min/1.73 m2 is considered abnormal if it is accompanied by abnormalities of urine sediment or abnormal results of imaging tests, or if the patient has had a kidney biopsy with documented abnormalities.5 As the reporting of estimated glomerular filtration rates has become more common, the relatively high prevalence of impaired kidney function (i.e., estimated glomerular filtration rate < 60 mL/min/1.73 m2) has become evident.6

The National Kidney Foundation in the United States has published a classification system based on glomerular filtration rate as well as urinary and anatomic abnormalities (Table 1) to enhance the identification and management of chronic kidney disease.5 Controversies exist in the literature as to the validity of this classification system based on estimated glomerular filtration rate for certain patient groups. However, awareness and attention to chronic kidney disease have increased since the publication of this staging system and the surrounding education.7

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Table 1.

Most patients with chronic kidney disease will die of events related to cardiovascular disease before end-stage renal disease develops.8 Therefore, an important focus of care for patients with chronic kidney disease includes management of cardiovascular risk factors. These guidelines are the first integrated publication to guide and optimize care for patients with chronic kidney disease. As part of a national strategy that incorporates chronic disease management, these guidelines serve as a starting point for ensuring optimal management of care for these patients. Guidelines, however, do not replace clinical judgment or the need for a nephrology consultation if questions arise.

Clinical practice guidelines for the management of chronic kidney disease that does not require dialysis have been developed in the United Kingdom, Australia and the United States. The Canadian guidelines are unique because they include an in-depth evaluation of a broad range of topics in the management of chronic kidney disease, are based on the most recent evidence and are aimed at front-line physicians (both general practitioners and specialists).

Development of the guidelines

We initially divided the management of chronic kidney disease into key topic areas. We assigned each topic to nephrologists and content experts within the field (Appendix 2, available at www.cmaj.ca/cgi/content/full/179/11/1154/DC1) who performed a systematic review of the literature from which relevant recommendations were developed. The topics were chosen based on their importance in the management of chronic kidney disease, as well as the existence of an evidence base. In addition, we have included topics that do not have a substantial direct or indirect evidence base but are important for practitioners and patients (e.g., preparation for care of end-stage renal disease and comprehensive conservative management).

Each recommendation was graded using the scheme developed by the Canadian Hypertension Education Program9 and used by the Canadian Society of Nephrology Guidelines Committee (Appendix 3, Appendix 4, available at www.cmaj.ca/cgi/content/full/179/11/1154/DC1).10 The criteria for grading these recommendations range from those reflecting highly valid, precise and applicable studies (grade A) to those based on lower level evidence and expert opinion (grade D). Grades B and C refer to studies of lesser degrees of validity, including surrogate outcomes or extrapolation of study results to other populations. The final draft of the guidelines was reviewed by experts and external stakeholders, including other relevant associations, to ensure consistency with other guidelines.

We developed the clinical practice guidelines statements using best evidence where available. In cases where evidence did not exist, we provide the clinical practice recommendations along with the rationale. The full text of each discrete subject area is available online (Appendix 1, available at Appendix 3, www.cmaj.ca/cgi/content/full/179/11/1154/DC1) and includes the rationale for the statements, the evidence base and the relevant background. A summary of the guidelines is provided in Appendix 5 (available at www.cmaj.ca/cgi/content/full/179/11/1154/DC1).

It is important to recognize that the major risk for patients with chronic kidney disease is death from cardiovascular disease or diabetic complications. As a consequence, we chose to align the guidelines with those from the Canadian Diabetes Association, the Canadian Hypertension Education Program, and the Canadian Cardiovascular Society.

Clinical recommendations

Referral of adult patients with reduced kidney function

Guidance for primary care providers and specialists for the referral of patients with chronic kidney disease to nephrologists are available (www.csnscn.ca). Most cases of nonprogressive chronic kidney disease can be managed without referral to a nephrologist. Referral to a nephrologist is generally recommended for patients with acute kidney failure, persistent estimated glomerular filtration rate less than 30 mL/min/1.73 m2, progressive decline of kidney function, ratio of urine protein to creatinine greater than 100 mg/mmol (about 900 mg/24 h) or urine albumin to creatinine ratio greater than 60 mg/mmol (about 500 mg/24 h), inability to achieve treatment targets, or rapid changes in kidney function.

Hypertension

Hypertension is commonly associated with chronic kidney disease. It develops in more than 75% of patients with chronic kidney disease at any stage.10 It is both a cause and a consequence of chronic kidney disease. This section of the guidelines highlights key aspects of the management of hypertension in patients with chronic kidney disease. These aspects include target blood pressure, initial drug therapy for proteinuric and nonproteinuric chronic kidney disease, and treatment of hypertension in association with diabetes and large-vessel renal vascular disease (Box 1).

Figure1
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Box 1.

Diabetes

Patients with diabetes are at increased risk for chronic kidney disease and cardiovascular events. The control of blood glucose levels in patients with chronic kidney disease may be problematic because of increased or changing sensitivity to conventional regimens, varying dietary advice and compliance issues related to the complexity of care required. Thus, it is important for clinicians to appreciate the importance of glycemic control for these patients.11–16 At present there is limited evidence to guide recommendations for diabetic care in the chronic kidney disease population. As a consequence, the statements are limited in scope. These recommendations (Box 2) are not intended to replace the Canadian Diabetes Association Guidelines17 but rather to focus on aspects of care specific to patients with chronic kidney disease. Additional information is available in the clinical practice guidelines from the Canadian Diabetes Association.17

Figure2
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Box 2.

Metformin is an inexpensive and effective oral hypoglycemic agent that is recommended as first-line therapy for both overweight and nonoverweight patients with type 2 diabetes mellitus.17 Metformin has been shown to be effective in both obese and nonobese patients.18 There is much concern about the safety of metformin in chronic kidney disease, particularly the risk for lactic acidosis. A Cochrane review of 206 trials including 47 846 patient-years of exposure to metformin found no cases of fatal or nonfatal lactic acidosis.19 Reviews of case reports of metformin-associated lactic acidosis suggest metformin may be a coprecipitant of lactic acidosis, as cases were most commonly seen in acute (or acute on chronic) renal failure (often precipitated by angiotensin-converting-enzyme [ACE] inhibitors or nonsteroidal anti-inflammatory drugs), or were associated with another major illness such as hepatic failure, sepsis, bowel obstruction and shock.20

Dyslipidemia

There is a high prevalence of dyslipidemia among patients at every stage of chronic kidney disease.21 Thus, screening, evaluation and therapeutic interventions for control of dyslipidemia are important. Unfortunately, because most clinical trials have excluded patients with chronic kidney disease, the evidentiary base is limited. Nonetheless, the guidelines attempt to address key questions related to lipid abnormalities in patients with chronic kidney disease (Box 3). Few data are available about the optimal frequency of lipid measurements in patients with chronic kidney disease; therefore, the working group recommends that existing guidelines for the general population be followed.22 Subgroup analyses from landmark trials have demonstrated that statin therapy reduces the risk of cardiovascular events in patients with stage 1–3 chronic kidney disease.23–25 We therefore suggest that physicians prescribe statin therapy as per existing lipid guidelines. There is no evidence to support routine serial monitoring of creatinine kinase and alanine aminotransferase in patients with chronic kidney disease who are receiving low-to moderate-dose statin therapy.26–28

Figure3
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Box 3.

Lifestyle management

This section of the guidelines stress the importance of lifestyle management in the care for patients with impaired renal function. Because chronic kidney disease shares common risk factors with cardiovascular disease and diabetes, lifestyle modifications directed at smoking, obesity, alcohol consumption, exercise and diet are important (Box 4). Dietary protein intake has been the focus of several trials. However, there is a lack of convincing evidence that the long-term restriction of protein intake (< 0.70 g/kg/day) delays the progression of chronic kidney disease. Thus, a protein-controlled diet (0.80–1.0 g/kg/day) is recommended.29–31 There have been no studies about dietary salt restriction and development or progression of chronic kidney disease. However, the benefits of salt reduction as they pertain to the development and control of hypertension are available32,33 and are included in the guidelines.

Figure4
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Box 4.

Proteinuria

Proteinuria is included in the guidelines because it is a marker of kidney damage and an important risk factor for progression of chronic kidney disease as well as cardiovascular morbidity and mortality.34,35 The presence of proteinuria in 2 of 3 consecutive urine samples is needed to determine persistent proteinuria at any glomerular filtration rate (Box 5). The preferred method of screening for proteinuria is a single random measurement of the ratio of urine protein to creatinine or of albumin to creatinine.36,37 At present, population-based screening for proteinuria is not recommended. Both ACE inhibitors and angiotensin-receptor blockers are effective in reducing protein excretion.38–43 Nonpharmacologic therapies are less effective.44,45 The level of proteinuria at which ACE inhibitor or angiotensin-receptor blockers should be initiated has been defined for patients with hypertension (Box 1) and those with diabetes (Box 5). For patients without hypertension or diabetes, there is insufficient evidence to determine the level of proteinuria at which to initiate therapy with an ACE inhibitor or an angiotensin-receptor blocker. However, a large trial showed benefit of ACE-inhibitor treatment compared with conventional antihypertensive treatment among patients with 1 or more gram of proteinuria per day (protein to creatinine ratio about 100 mg/mmol).46,47

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Box 5.

Anemia

Anemia is prevalent among patients with an estimated glomerular filtration rate less than 60 mL/min/1.73 m2.48 Anemia is associated with adverse outcomes in patients with chronic kidney disease, including hospital admission, cardiovascular disease and mortality.49,50 Although erythropoietin deficiency is a well-known cause of anemia in this population, the guidelines recommend that other potential causes of anemia should be sought (eg., iron deficiency) and treated accordingly (Box 6). To date, therapies to normalize the hemoglobin level in these patients have not shown any health benefit. These therapies have been associated with an increased incidence of death or need for dialysis.51–53 Based on this evidence, a target hemoglobin level of 110 g/L is recommended for patients with chronic kidney disease (acceptable range 100–120 g/L). The use of erythropoiesis-stimulating agents for the treatment of anemia in patients with chronic kidney disease is associated with potential adverse outcomes, including increased blood pressure and thrombotic complications. They should be prescribed by a specialist with experience in prescribing these agents. Iron therapy is an important component of anemia management.54,55 We recommend that the oral form of iron be considered preferentially over the intravenous form.

Figure6
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Box 6.

Mineral metabolism

Renal excretory function plays an important role in maintaining the balance of calcium and phosphate. Because progressive chronic kidney disease results in the development of hyperphosphatemia and hypocalcemia, this section of the guidelines focuses on assessment and treatment of mineral abnormalities. These metabolic alterations may play a role in the pathophysiology of vascular calcification as well as bone disease. The potential for bone disease may be increased in the presence of acidosis, which may be treated with the use of oral bicarbonate. The kidney is also a site of the 1α-hydroxylation of 25-hydroxyvitamin D to its active form, 1,25-dihydroxyvitamin D (calcitriol). As renal function declines in chronic kidney disease, calcitriol deficiency promotes parathyroid gland hyperplasia and increased parathyroid hormone synthesis, ultimately leading to secondary hyperparathyroidism.

Currently, there is limited evidence on the impact of mineral metabolism abnormalities or their treatment on outcomes in patients with chronic kidney disease not receiving dialysis. Our recommendations (Box 7) were primarily extrapolated from data obtained from patients receiving dialysis. Thus, the statements are limited in scope because of the need for an evidentiary base. Observational studies in the general and chronic kidney disease and dialysis populations suggest an association between such metabolic abnormalities in chronic kidney disease and mortality risk.56–58 However, to date, there have been no randomized trials showing that improved metabolic control affects survival. In the absence of data supporting fracture or mortality reduction with metabolic control hard outcome, the working group considers best practice to be the maintenance of normal calcium and phosphate levels and supplementation with active vitamin D if parathyroid hormone levels are elevated. There is insufficient evidence to suggest routine measurement of 25-hydroxyvitamin D. Dietary modifications are recommended initially,59 followed by therapy with calcium-containing phosphate binders (calcium gluconate or calcium acetate). In the absence of data with morbidity and mortality reduction supporting phosphate binders that do not contain calcium (sevelamer and lanthanum), these agents cannot be recommended. In fact, the potential economic impact in Canada may be prohibitive.60

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Box 7.

Initiation of renal replacement therapy

Although the overall objectives of the guidelines and recommendations are to delay progression of both chronic kidney disease and its complications, a proportion of patients will require renal replacement therapy (either dialysis or transplantation) to extend their life. The purpose of this section of the guidelines is to delineate the aspects of education, care and processes that are necessary to optimize the preparation of these patients for renal replacement therapy (Box 8). Appendix 1 includes references with more complete information on this topic (available at www.cmaj.ca/cgi/content/full/179/11/1154/DC1). Physicians and health care providers must be aware of the need for preparation and the time that is required to implement these care plans.

Figure8
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Box 8.

A kidney transplant from a live donor should be promoted as the first choice for eligible patients who require renal replacement therapy. Outcomes with deceased donor kidneys are also significantly better than with dialysis.61–63 For patients with progressive chronic kidney disease with plans for hemodialysis, making plans for vascular access is an important component of their care in preparation for end-stage renal disease. Care plans may include detailed assessment (including venous mapping and avoidance of venipuncture or blood pressure measurements on the nondominant arm to protect it for access creation).64 At this point, care should be coordinated by a nephrologist. A comprehensive discussion of monitoring of vascular access, prevention of infection and management of complications is included in the hemodialysis clinical practice guidelines by the Canadian Society of Nephrology.65 More frequent or sustained dialysis, such as nocturnal hemodialysis or peritoneal dialysis, is an alternative to conventional hemodialysis received 3 times per week and should be offered to suitable patients based on need and availability.66

Comprehensive conservative management

The care of patients with chronic kidney disease necessarily includes proactive comprehensive management for those who choose not to receive renal replacement therapy and for those who come to the end of their life after a period of time on a therapy. We describe the components and needs for comprehensive conservative management and end-of-life care for patients with chronic kidney disease (Box 9). We recognize that not all patients will have been referred to a nephrology team at the time that they declined renal replacement therapy, therefore, we have tried to be appropriately broad in these recommendations.

Figure9
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Box 9.

Comprehensive conservative management requires the involvement of an interdisciplinary team, including nephrologists, chronic kidney disease nurses, dietitian, social workers, psychologists, spiritual care workers, palliative care physicians and nurses, and appropriately trained and supervised volunteers. The patient's primary care physician is an integral part of this team.67 In conjunction with the patient and family, the interdisciplinary team should develop a care plan that addresses the physical, psychological and spiritual needs of the patient and his or her family and caregivers. Shared decision-making is an integral component of this process, and revisions to the care plan should be based on the changing needs and preferences of the patient and family.68–70

Future directions and knowledge gaps

At present, the best available evidence suggests that blood pressure and glycemic control will have the greatest impact on delaying the progression of both chronic kidney disease and cardiovascular disease. Nonetheless, the complexity of this condition clearly requires a better understanding of the absolute and relative value of identifying and treating the myriad clinical and laboratory abnormalities that occur in the context of reduced kidney function. Although individual retrospective or observational studies and basic research have generated data that support the importance of anemia and lipid and mineral metabolism abnormalities, it is critical that we better define the importance of these conditions for each stage of chronic kidney disease. Furthermore, we need to develop and evaluate risk scores for progression, such that resources can be appropriately directed to patients at greatest risk of progression and not to those who simply have reduced kidney function or evidence of kidney damage.

We can identify patients at risk for chronic kidney disease who have cardiovascular disease, diabetes or belong to a specific ethnic group or have a family history of chronic kidney disease. We can ensure that patients with chronic kidney disease and any other risk factor for cardiovascular disease receive aggressive treatment, and that a sense of therapeutic nihilism does not overcome our judgment and clinical care. Most importantly, the lack of evidence should not foster further nihilism but rather encourage us to advocate for the design of and enrollment into randomized control trials that answer questions relevant to this population.

@@ See related ocmmentary by Eknoyan, page 1107

    Key points

  • Chronic kidney disease is common and is associated with increased cardiovascular risk.

  • Attention to cardiovascular risk factors remains the cornerstone of care to delay progression of chronic kidney disease and prevent cardiovascular events.

  • Randomized clinical trials are lacking; thus, recommendations in the guidelines are based on a synthesis of the best available evidence.

  • Shared care of patients with chronic kidney disease by general practitioners and specialists is encouraged.

Footnotes

  • Funding: The Canadian Society of Nephrology provided financial support for the publication and distribution of these guidelines.

    This article has been peer reviewed.

    Contributors: All of the authors contributed to the conception and design of the guidelines and to the development of the guideline recommendations and statements. Adeera Levin and Brenda Hemmelgarn drafted the manuscript. All of the authors revised it for important intellectual content and approved the final version submitted for publication.

    Competing interests: Bruce Culleton is employed by and holds stock in Baxter Healthcare. All of his input into the guidelines occurred before he joined Baxter Healthcare.

    Sheldon Tobe has received honoraria for academic talks for Pfizer, Bristol-Myers Squibb, Merck, Sanofi-Aventis, Amgen, Abbott, Boehringer Ingelheim, Bayer and AstraZeneca. He is involved in several contract and investigator-initiated research projects for Abbott, AstraZeneca, Pfizer, Ortho Biotech, Novartis, Bristol-Myers Squibb, Sanofi-Aventis, Amgen, Roche, Merck Frosst and Boehringer Ingelheim. Sheldon Tobe holds US and Canadian patents for a bicarbonate-buffered dialysis solution sold by Apotex/ Dialysis Solutions Inc., and he works with this company as a consultant.

    Philip McFarlane has been a consultant to or an advisory board member of Ortho Biotech, Amgen, Sanofi-Aventis, Bristol-Myers Squibb, Biovail, Pfizer, Novartis, AstraZeneca, Fresenius, Boehringer Ingelheim, Roche and Schering-Plough. He has received honoraria for presentations from Ortho-Biotech, Amgen, Sanofi-Aventis, Bristol-Myers Squibb, Biovail, Novartis, Abbott and Merck. Philip McFarlane has participated in or received research grant funding from Sanofi-Aventis, GlaxoSmithKline, Biovail, Boehringer Ingelheim, AstraZeneca, Ortho Biotech and Amgen.

    Marcel Ruzicka has received speaker's fees from Abbott, Bayer, Boehringer Ingelheim, Pfizer, Novartis, Bristol-Myers Squibb and AstraZeneca.

    Kevin Burns has received educational grants from Hoffman LaRoche, Bristol-Myers Squibb, Sanofi-Aventis and Pfizer Canada.

    Colin White is a member of a provincial advisory board for Roche for their product CERA, and the honoraria were deposited directly into an educational fund. He has performed work on a computer program for Genzyme for tracking outcome data related to calcium and phosphate metabolism.

    Brendan Barrett received travel assistance from AstraZeneca to attend the American Society of Nephrology annual meeting in 2007 where he presented the results of an investigator-initiated trial that was sponsored by Astra-Zeneca. Brendan Barrett has received an unrestricted educational grant from Wyeth that was used to assist trainees attend a conference of their choice. He has received speaker's fees from Merck, AstraZeneca, Pfizer and Boehringer Ingelheim for continuing medical education events.

    Robert Foley is a consultant for Affymax Inc. He has received speaker's fees from Amgen, Roche and Ortho Biotech.

    Ayub Akbari has received educational grants and speaker's fees from Boehringer Ingelheim, Sanofi and Pfizer.

    Martina Reslerova has received speaker's fees from Shire Pharmaceuticals and Genzyme.

    None declared for Adeera Levin, Brenda Hemmelgarn, Braden Manns, Francois Madore, Louise Moist, Scott Klarenbach, Kailash Jindal, Peter Senior, Neesh Pannu, Sabin Shurraw, Adam Cohn, Vinay Deved, David Mendelssohn, Gihad Nesrallah, Joanne Kappel and Marcello Tonelli.

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Canadian Medical Association Journal: 179 (11)
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Vol. 179, Issue 11
18 Nov 2008
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Guidelines for the management of chronic kidney disease
Adeera Levin, Brenda Hemmelgarn, Bruce Culleton, Sheldon Tobe, Philip McFarlane, Marcel Ruzicka, Kevin Burns, Braden Manns, Colin White, Francoise Madore, Louise Moist, Scott Klarenbach, Brendan Barrett, Robert Foley, Kailash Jindal, Peter Senior, Neesh Pannu, Sabin Shurraw, Ayub Akbari, Adam Cohn, Martina Reslerova, Vinay Deved, David Mendelssohn, Gihad Nesrallah, Joanne Kappel, Marcello Tonelli
CMAJ Nov 2008, 179 (11) 1154-1162; DOI: 10.1503/cmaj.080351

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Guidelines for the management of chronic kidney disease
Adeera Levin, Brenda Hemmelgarn, Bruce Culleton, Sheldon Tobe, Philip McFarlane, Marcel Ruzicka, Kevin Burns, Braden Manns, Colin White, Francoise Madore, Louise Moist, Scott Klarenbach, Brendan Barrett, Robert Foley, Kailash Jindal, Peter Senior, Neesh Pannu, Sabin Shurraw, Ayub Akbari, Adam Cohn, Martina Reslerova, Vinay Deved, David Mendelssohn, Gihad Nesrallah, Joanne Kappel, Marcello Tonelli
CMAJ Nov 2008, 179 (11) 1154-1162; DOI: 10.1503/cmaj.080351
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