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Chronic renal failure

Chronic renal failure (CRF, or "chronic kidney failure", CKF) is a slowly progressive loss of renal function over a period of months or years and defined as an abnormally low glomerular filtration rate, which is usually determined indirectly by the creatinine level in blood serum. more...

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CRF that leads to severe illness and requires some form of renal replacement therapy (such as dialysis) is called end-stage renal disease (ESRD).

Signs and symptoms

Initially it is without symptoms and can only be detected as an increase in serum creatinine. As the kidney function decreases:

  • Blood pressure is increased (hypertension)
  • Urea accumulates, leading to uremia (symptoms ranging from lethargy to pericarditis and encephalopathy)
  • Potassium accumulates in the blood (known as hyperkalemia with symptoms ranging from malaise to fatal cardiac arrhythmias)
  • Erythropoietin synthesis is decreased (leading to anemia causing fatigue)
  • fluid volume overload - symptoms may range from mild edema to life-threatening pulmonary edema
  • Hyperphosphatemia - due to reduced phosphate excretion, associated with hypocalcemia (due to vitamin D3 deficiency) and hyperparathyroidism - leads to renal osteodystrophy and vascular calcification

CRF patients suffer from accelerated atherosclerosis and have higher incidence of cardiovascular disease, with a poorer prognosis.

Diagnosis

In many CRF patients, previous renal disease or other underlying diseases are already known. A small number presents with CRF of unknown cause. In these patients, a cause is occasionally identified retrospectively.

It is important to differentiate CRF from acute renal failure (ARF) because ARF can be reversible. Abdominal ultrasound is commonly performed, in which the size of the kidneys are measured. Kidneys in CRF are usually smaller (< 9 cm) than normal kidneys with notable exceptions such as in diabetic nephropathy and polycystic kidney disease. Another diagnostic clue that helps differentiate CRF and ARF is a gradual rise in serum creatinine (over several months or years) as opposed to a sudden increase in the serum creatinine (several days to weeks). If these levels are unavailable (because the patient has been well and has had no blood tests) it is occasionally necessary to treat a patient briefly as having ARF until it has been established that the renal impairment is irreversible.

Numerous uremic toxins (see link) are accumulating in chronic renal failure patients treated with standard dialysis. These toxins show various cytotoxic activities in the serum, have different molecular weights and some of them are bound to other proteins, primarily to albumin. Such toxic protein bound substances are receiving the attention of scientists who are interested in improving the standard chronic dialysis procedures used today.

Causes

The most common causes of CRF in North America and Europe are diabetic nephropathy, hypertension, and glomerulonephritis. Together, these cause approximately 75% of all adult cases. Certain geographic areas have a high incidence of HIV nephropathy.

Read more at Wikipedia.org


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