Chronic Glomerulonephritis 

  • Author: Moro O Salifu, MD, MPH, FACP; Chief Editor: Vecihi Batuman, MD, FACP, FASN   more...
 
Updated: Jan 12, 2012
 

Background

Nearly all forms of acute glomerulonephritis have a tendency to progress to chronic glomerulonephritis. The condition is characterized by irreversible and progressive glomerular and tubulointerstitial fibrosis, ultimately leading to a reduction in the glomerular filtration rate (GFR) and retention of uremic toxins. If disease progression is not halted with therapy, the net result is chronic kidney disease (CKD), end-stage renal disease (ESRD), and cardiovascular disease. The diagnosis of CKD can be made without knowledge of the specific cause.[1]

The National Kidney Foundation defines CKD as (1) evidence of kidney damage based on abnormal urinalysis results (eg, proteinuria, hematuria) or structural abnormalities observed on ultrasound images or (2) a GFR of less than 60 mL/min for 3 or more months. Based on this definition, the National Kidney Foundation developed guidelines that classify the progression of renal disease into 5 stages, from kidney disease with a preserved GFR to end-stage kidney failure. This classification includes treatment strategies for each progressive level, as follows:

  • Stage 1: This stage is characterized by kidney damage with a normal GFR (≥ 90 mL/min). The action plan is diagnosis and treatment, treatment of comorbid conditions, slowing of the progressing of kidney disease, and reduction of cardiovascular disease risks.
  • Stage 2: This stage is characterized by kidney damage with a mild decrease in the GFR (60-90 mL/min). The action plan is estimation of the progression of kidney disease.
  • Stage 3: This stage is characterized by a moderately decreased GFR (30-59 mL/min). The action plan is evaluation and treatment of complications.
  • Stage 4: This stage is characterized by a severe decrease in the GFR (15-29 mL/min). The action plan is preparation for renal replacement therapy.
  • Stage 5: This stage is characterized by kidney failure. The action plan is kidney replacement if the patient is uremic.

At the later stages of glomerular injury, biopsy results cannot help distinguish the primary disease. Histology and clues to the etiology are often derived from other systemic diseases, if present. Considerable cause-specific variability is observed in the rate at which acute glomerulonephritis progresses to chronic glomerulonephritis.

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Pathophysiology

Reduction in nephron mass from the initial injury reduces the GFR. This reduction leads to hypertrophy and hyperfiltration of the remaining nephrons and to the initiation of intraglomerular hypertension. These changes occur in order to increase the GFR of the remaining nephrons, thus minimizing the functional consequences of nephron loss. The changes, however, are ultimately detrimental because they lead to glomerulosclerosis and further nephron loss.

In early renal disease (stages 1-3), a substantial decline in the GFR may lead to only slight increases in serum creatinine levels. Azotemia (ie, a rise in BUN and serum creatinine levels) is apparent when the GFR decreases to less than 60-70 mL/min. In addition to a rise in BUN and creatinine levels, the substantial reduction in the GFR results in decreased production of (1) erythropoietin, thus resulting in anemia; (2) decreased production of vitamin D, resulting in hypocalcemia, secondary hyperparathyroidism, hyperphosphatemia, and renal osteodystrophy; (3) reduction in acid, potassium, salt, and water excretion, resulting in acidosis, hyperkalemia, hypertension, and edema; and (4) platelet dysfunction, leading to increased bleeding tendencies.

Accumulation of toxic waste products (uremic toxins) affects virtually all organ systems. Azotemia occurring with the signs and symptoms listed above is known as uremia. Uremia occurs at a GFR of approximately 10 mL/min. Some of these toxins (eg, BUN, creatinine, phenols, guanidines) have been identified, but none has been found to be responsible for all the symptoms.

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Epidemiology

Frequency

United States

Chronic glomerulonephritis is the third leading cause of ESRD and accounts for 10% of patients on dialysis in the United States.

International

Chronic glomerulonephritis accounted for up to 40% of patients on dialysis in Japan and some Asian countries. However, more recent data suggest that, in Japan for instance, the rate of chronic glomerulonephritis in patients on dialysis is 28%. The cause of this declining rate is not known. Concurrent with the decline in chronic glomerulonephritis in these countries is an increase in diabetic nephropathy in up to 40% of patients on dialysis.

Mortality/Morbidity

ESRD and death are common outcomes unless renal replacement therapy is instituted.

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Contributor Information and Disclosures
Author

Moro O Salifu, MD, MPH, FACP  Associate Professor, Department of Internal Medicine, Chief, Division of Nephrology, Director of Nephrology Fellowship Program and Transplant Nephrology, State University of New York Downstate Medical Center

Moro O Salifu, MD, MPH, FACP is a member of the following medical societies: American College of Physicians-American Society of Internal Medicine, American Medical Association, American Society for Artificial Internal Organs, American Society of Diagnostic and Interventional Nephrology, American Society of Nephrology, American Society of Transplantation, and National Kidney Foundation

Disclosure: Nothing to disclose.

Coauthor(s)

Barbara G Delano, MD, MPH  Director of Home Hemodialysis and Peritoneal Dialysis, Professor, Department of Internal Medicine, Division of Nephrology, State University of New York at Brooklyn

Barbara G Delano, MD, MPH is a member of the following medical societies: American Society of Nephrology, International Society of Nephrology, National Kidney Foundation, and Sigma Xi

Disclosure: Nothing to disclose.

Specialty Editor Board

Frank C Brosius III, MD  Nephrology Program Director, Professor of Internal Medicine and Physiology, Department of Internal Medicine, Division of Nephrology, University of Michigan School of Medicine

Frank C Brosius III, MD is a member of the following medical societies: Alpha Omega Alpha, American Diabetes Association, American Society of Nephrology, and Phi Beta Kappa

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD  Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

George R Aronoff, MD  Director, Professor, Departments of Internal Medicine and Pharmacology, Section of Nephrology, Kidney Disease Program, University of Louisville School of Medicine

George R Aronoff, MD is a member of the following medical societies: American Federation for Medical Research, American Society of Nephrology, Kentucky Medical Association, and National Kidney Foundation

Disclosure: Nothing to disclose.

Rebecca J Schmidt, DO, FACP, FASN  Professor of Medicine, Section Chief, Department of Medicine, Section of Nephrology, West Virginia University School of Medicine

Rebecca J Schmidt, DO, FACP, FASN is a member of the following medical societies: American College of Physicians, American Medical Association, American Society of Nephrology, International Society of Nephrology, National Kidney Foundation, Renal Physicians Association, and West Virginia State Medical Association

Disclosure: Renal Ventures Ownership interest Other

Chief Editor

Vecihi Batuman, MD, FACP, FASN  Professor of Medicine, Section of Nephrology-Hypertension, Tulane University School of Medicine; Chief, Medicine Service, Southeast Louisiana Veterans Health Care System

Vecihi Batuman, MD, FACP, FASN is a member of the following medical societies: American College of Physicians, American Society of Hypertension, American Society of Nephrology, and International Society of Nephrology

Disclosure: Nothing to disclose.

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