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Diabetic nephropathy

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Diabetic nephropathy
SpecialtyNephrology, endocrinology Edit this on Wikidata

Diabetic nephropathy (or diabetic kidney disease[1]) is a progressive kidney disease caused by damage to the capillaries in the kidney's glomeruli.[2] It is characterized by nephrotic syndrome and diffuse scarring of the glomeruli. It is due to longstanding diabetes mellitus, and is a prime reason for dialysis in many developed countries. It is classified as a small blood vessel complication of diabetes.[3]

Signs and symptoms

During its early course, diabetic nephropathy often has no symptoms.[4] Symptoms can take 5 to 10 years to appear after the kidney damage begins.[4] These late symptoms include severe tiredness, headaches, a general feeling of illness, nausea, vomiting, lack of appetite, itchy skin, and leg swelling.[4]

Causes

Illustration depicting diabetic nephropathy

Diabetic nephropathy, classically defined by the presence of proteinuria occurs in significant percent of patients with type 1 which formerly called insulin-dependent and type 2 which formerly called non-insulin-dependent diabetes mellitus (DM). It also can occur in the patients with secondary forms of DM for example after pancreatitis or pancreatectomy if the duration of DM is longs-enough and level of glycemia high enough to result diabetic complications.

The cause of diabetic nephropathy is not well understood, but it is thought that high blood sugar, advanced glycation end product formation, and cytokines may be involved in the development of diabetic nephropathy.[5]

Kidney damage is likely if one or more of the following is present:[4]

Mechanism

Diabetes causes a number of changes to the body's metabolism and blood circulation, which likely combine to produce excess reactive oxygen species (chemically reactive molecules containing oxygen). These changes damage the kidney's glomeruli (networks of tiny blood vessels), which leads to the hallmark feature of albumin in the urine (called albuminuria).[6]

Diagnosis

CKD Stage[7] eGFR level (mL/min/1.73 m2)
Stage 1 ≥ 90
Stage 2 60 – 89
Stage 3 30 – 59
Stage 4 15 – 29
Stage 5 < 15

Diagnosis is usually based on the measurement of high levels of albumin in the urine or evidence of reduced kidney function.[8] Albumin measurements are defined as follows:[9]

  • Normal albuminuria: urinary albumin excretion <30 mg/24h;
  • Microalbuminuria: urinary albumin excretion in the range of 30–299 mg/24h;
  • Clinical (overt) albuminuria: urinary albumin excretion ≥300 mg/24h.

People with diabetes are recommended to have their albumin levels checked annually, beginning immediately after diagnosis for type 2 diabetics, and five years after diagnosis for type 1 diabetics.[8][10] To test kidney function, the person's estimated glomerular filtration rate (eGFR) is measured from a blood sample. Normal eGFR ranges from 90 to 120 mm/min/1.73 m2.[11]

Treatment

ACE inhibitor

The goals of treatment are to slow the progression of kidney damage and control related complications. The main treatment, once proteinuria is established, is ACE inhibitor medications, which usually reduce proteinuria levels and slow the progression of diabetic nephropathy.[12] Other issues that are important in the management of this condition include control of high blood pressure and blood sugar levels (see diabetes management), as well as the reduction of dietary salt intake.[13]

Prognosis

Diabetic nephropathy in type 2 diabetes can be more difficult to predict because the onset of diabetes is not usually well established. Without intervention, 20-40 percent of patients with type 2 diabetes/microalbuminuria, will evolve to macroalbuminuria.[14]

The following are possible complications of diabetic nephropathy:[medical citation needed]

Epidemiology

In the U.S., diabetic nephropathy affected an estimated 6.9 million people during 2005–2008.[15] The number of people with diabetes and consequently diabetic nephropathy is expected to rise substantially by the year 2050.[16]

See also

References

  1. ^ Kittell F (2012). "Diabetes Management". Nutrition Therapy for Chronic Kidney Disease. CRC Press. p. 198. {{cite book}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  2. ^ "diabetic nephropathy". Retrieved 2015-06-27.
  3. ^ Longo et al., Harrison's Principles of Internal Medicine, 18th ed., p.2982
  4. ^ a b c d "Diabetes and kidney disease: MedlinePlus Medical Encyclopedia". www.nlm.nih.gov. Retrieved 2015-06-27.
  5. ^ "Diabetic Nephropathy: Background, Pathophysiology, Etiology". 2015-06-20. {{cite journal}}: Cite journal requires |journal= (help)
  6. ^ Cao, Zemin; Cooper, Mark E (2011). "Pathogenesis of diabetic nephropathy". Journal of Diabetes Investigation. 2 (4): 243–247. doi:10.1111/j.2040-1124.2011.00131.x. ISSN 2040-1116. PMC 4014960. PMID 24843491.
  7. ^ Fink, Howard A.; Ishani, Areef; Taylor, Brent C.; Greer, Nancy L.; MacDonald, Roderick; Rossini, Dominic; Sadiq, Sameea; Lankireddy, Srilakshmi; Kane, Robert L. (2012). "Introduction". {{cite journal}}: Cite journal requires |journal= (help)
  8. ^ a b "Risk factor control is key in diabetic nephropathy". Practitioner. 258 (1768): 13–7, 2. 2014. PMID 24689163. {{cite journal}}: Cite uses deprecated parameter |authors= (help)
  9. ^ "CDC - Chronic Kidney Disease - Glossary". Retrieved 2015-07-02.
  10. ^ Koroshi, A (2007). "Microalbuminuria, is it so important?". Hippokratia. 11 (3): 105–107. ISSN 1108-4189. PMC 2658722. PMID 19582202.
  11. ^ "Glomerular filtration rate: MedlinePlus Medical Encyclopedia". www.nlm.nih.gov. Retrieved 2015-07-02.
  12. ^ Lim, Andy KH (2014). "Diabetic nephropathy – complications and treatment". International Journal of Nephrology and Renovascular Disease. 7: 361–381. doi:10.2147/IJNRD.S40172. ISSN 1178-7058. PMC 4206379. PMID 25342915.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  13. ^ "Diabetic Nephropathy Treatment & Management: Approach Considerations, Glycemic Control, Management of Hypertension". 2015-06-20. {{cite journal}}: Cite journal requires |journal= (help)
  14. ^ Shlipak, Michael. "Clinical Evidence Handbook: Diabetic Nephropathy: Preventing Progression - American Family Physician". www.aafp.org. Retrieved 2015-06-27.
  15. ^ Lerma, Edgar V. (2014-01-01). Diabetes and Kidney Disease. Springer. ISBN 9781493907939.
  16. ^ Lai, K. N.; Tang, S. C. W. (2011-06-08). Diabetes and the Kidney. Karger Medical and Scientific Publishers. ISBN 9783805597432.

Further reading

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