Chronic Kidney Disease Management

Introduction

• Chronic kidney disease (CKD) is classified based on cause, GFR category, and albuminuria category, with GFR categories ranging from G1 (normal or high) to G5 (kidney failure) 1
• The following table outlines the GFR categories and their corresponding ranges:

Monitoring and Assessment

• For patients with mildly decreased renal function (eGFR 60-89 mL/min/1.73m²), regular monitoring every 6-12 months is recommended with attention to modifiable risk factors to prevent further decline in kidney function, including measuring serum creatinine and estimating GFR every 6-12 months 2
• Monitor urine protein excretion annually, and include kidney ultrasound examination as part of the assessment if kidney function declines, as recommended by the Kidney International guidelines 3
• Assess serum creatinine with eGFR calculation, and consider electrolytes, particularly if starting medications that affect kidney function 3
• Regular monitoring of GFR, albuminuria, serum creatinine, and electrolytes is essential for patients with CKD stage 4 4, 5, 6, 7
• The Annals of Internal Medicine guidelines recommend monitoring GFR and albuminuria based on risk category, with higher risk patients requiring more frequent monitoring (every 3-6 months) 1
• The Clinical Infectious Diseases society recommends screening for albuminuria/proteinuria using urine dipstick analysis and spot urine albumin-to-creatinine ratio (ACR) or protein-to-creatinine ratio for quantification 8
• The American College of Physicians recommends estimating glomerular filtration rate (GFR) using creatinine-based equations, with the CKD-EPI equation preferred over the MDRD Study equation due to less bias and greater accuracy 1
• The National Kidney Foundation suggests considering cystatin C measurement for more accurate GFR estimation, especially when eGFRcreat is 45-59 ml/min/1.73 m² 1

Blood Pressure Management

• Target blood pressure ≤140/90 mmHg for patients with urine albumin excretion <30 mg/24 hours, and ≤130/80 mmHg for patients with urine albumin excretion ≥30 mg/24 hours, according to the Annals of Internal Medicine guidelines 1
• Consider ACE inhibitors or ARBs as first-line therapy if hypertension or proteinuria is present, and uptitrate to maximally tolerated dose 1, 7
• The American Diabetes Association recommends a target blood pressure ≤130/80 mmHg using standardized office BP measurement, with first-line therapy being ACE inhibitor or ARB, especially with albuminuria >300 mg/24 hours, as stated in the Diabetes Care guidelines 6
• The Kidney International guidelines recommend targeting systolic blood pressure <120-130 mmHg using standardized office BP measurement 7
• Monitor renal function and potassium 1-2 weeks after initiation or dose changes of ACE inhibitors or ARBs 2

Medication Management

• Counsel patients to hold ACE inhibitors, ARBs, and diuretics during periods of volume depletion (e.g., acute illness with vomiting/diarrhea) to prevent acute kidney injury, as recommended by the Kidney International guidelines 7
• The European Heart Journal recommends discontinuing hydrochlorothiazide (HCTZ) in patients with GFR <45-50 ml/min/1.73m² due to reduced efficacy and potential contribution to further deterioration of renal function, and suggests considering replacing HCTZ with a loop diuretic if diuresis is still needed for volume management 9
• The American Diabetes Association recommends using SGLT2 inhibitors in patients with type 2 diabetes and CKD with eGFR ≥20 ml/min/1.73m² to reduce CKD progression and cardiovascular events, as stated in the Diabetes Care guidelines 6

Lifestyle Modifications

• Restrict dietary sodium to <2.0 g/day (<90 mmol/day), and normalize weight if overweight or obese, as recommended by the Kidney International guidelines 7
• Stop smoking, and encourage regular exercise to reduce the risk of cardiovascular disease and kidney disease progression 7
• The Kidney International guidelines suggest restricting sodium to <2.0 g/day (<90 mmol/day), limiting protein intake to 0.8 g/kg/day, and targeting caloric intake of 30-35 kcal/kg/day, with an emphasis on plant-based protein sources 7
• The American Diabetes Association recommends optimizing glucose management to reduce the risk or slow the progression of CKD, according to the Diabetes Care guidelines 6

Acute Kidney Injury Prevention

• Minimize episodes of acute kidney injury, and consider patients with any level of CKD at increased risk for AKI, according to the Annals of Internal Medicine guidelines 1
• Avoid nephrotoxic contrast agents when possible, or use appropriate prophylaxis to prevent acute kidney injury 1
• Avoid nephrotoxic agents when possible, including NSAIDs and certain antibiotics, to prevent further kidney damage 10

Cardiovascular Risk Management

• The Kidney International guidelines suggest assessing cardiovascular risk factors and considering statin therapy, especially if other cardiovascular risk factors are present (hypertension, diabetes) 7
• Patients with Stage 3a CKD have significantly increased cardiovascular risk compared to those with normal kidney function 11

Special Populations

• The Clinical Infectious Diseases society recommends more vigilant monitoring for African American persons, patients with diabetes, hypertension, hepatitis C virus coinfection, and HIV patients with CD4+ counts <200 cells/mL 8
• The Clinical Infectious Diseases society also recommends screening HIV-infected patients for kidney disease at diagnosis and annually if at high risk 8
• Elderly patients with CKD require more frequent monitoring of renal function and electrolytes 9
• The American Journal of Kidney Diseases and the European Heart Journal recommend monitoring renal function more frequently (every 1-3 months) in elderly patients with declining GFR 9, 12

Referral and Nephrology Care

• The Clinical Infectious Diseases society suggests considering referral when abnormal kidney function persists, progressive decline in kidney function occurs, significant proteinuria is present, or specialized diagnostic procedures are needed 8
• The Kidney International guidelines imply that patients with severely decreased GFR should be under nephrology care and prepared for potential kidney replacement therapy, including discussion of options and timely referral for vascular access creation 4

Mineral Bone Disease and Metabolic Acidosis

• The Annals of Internal Medicine guidelines recommend evaluating for mineral bone disease (calcium, phosphate, vitamin D) and monitoring for metabolic acidosis 10
• The Kidney International guidelines recommend treating metabolic acidosis if serum bicarbonate <22 mmol/l 7

Anemia Management

• The Praxis Medical Insights guidelines suggest screening for anemia, as prevalence increases when GFR falls below 60 ml/min/1.73 m² 11