Chronic Renal Failure
- What is chronic renal failure?
- Other names for chronic renal failure
What is chronic renal failure?
Chronic renal failure is a condition involving a decrease in the kidneys' ability to filter waste and fluid from the blood. It is chronic, meaning that the condition develops over a long period of time and is not reversible. The condition is also commonly known as chronic kidney disease (CKD).
Chronic renal failure is typically caused by certain other medical conditions that put strain on the kidneys over time, including diabetes, hypertension and long-term inflammation of the kidneys. Early symptoms of reduced kidney function include urinating more frequently, high blood pressure and swelling of the legs.
Around 15 percent of adults, or 30 million people in the United States are thought to have kidney disease at some stage. Because the condition takes some time to develop, it most commonly affects older people. Women are affected slightly more often than men, and people of African, Latin American and Native American descent are at higher risk of CKD.
People who are at risk of chronic renal failure should have regular health checks, which include evaluating the glomerular filtration rate. This is a more reliable method of diagnosing early stages of chronic renal failure than waiting for symptoms to appear.
Treatment consists of managing the underlying condition and supporting kidney function. Chronic renal failure requires careful, lifelong management, and can progress to end-stage kidney failure which requires dialysis or transplant. However, many cases of chronic renal failure are mild to moderate and can be managed by patients with support from a doctor.
Symptoms of chronic renal failure
- The urge to urinate more frequently
- Urine may be pale and foamy
- Hypertension (high blood pressure)
- Swelling of the legs
- Poor appetite
- Weight loss
- Muscle cramps or twitches
- Developing brown spots on the skin
- Worsening of swelling, including on the hands, ankles, feet and around the eyes
- Lack of concentration or drowsiness
- Feeling lethargic and without energy
- Bruising easily
- Blood in the stool
- Amenorrhea (periods stopping)
- Itchy, dry skin
- Pain in the bones
- Increased susceptibility to infection
- Nausea and vomiting
Complications of chronic renal failure
If kidney disease progresses, it can lead to kidney failure, also known as end-stage renal disease. This means that the kidneys will no longer be able to process waste and remove it from the body. This will require dialysis or, potentially, a kidney transplant.
Anemia is a common condition in people with chronic renal failure that tends to occur after a person loses 20 to 50 percent of kidney function. Damaged kidneys do not produce enough of a hormone called erythropoietin (EPO), which promotes the creation of red blood cells.
For more information, see the resource about anemia.
Vitamin D deficiency
People with chronic renal failure do not process vitamin D as efficiently as people with healthy kidneys and are at risk of vitamin D deficiency. Some of the problems this can lead to include:
Causes of chronic renal failure
Chronic renal failure mostly occurs in people who have other medical conditions which cause damage to the small units in the kidneys, called nephrons, which are responsible for filtering waste and fluid from the blood.
Common conditions which can cause chronic renal failure include:
Diabetes: One in three adults with diabetes are likely to develop chronic renal failure Hypertension: One in five adults with high blood pressure are likely to develop chronic renal failure
People with diabetes and hypertension, who are at high risk of developing chronic renal failure, should have regular health checks to measure their glomerular filtration rate. Diabetics should also have regular microalbumin tests. These tests can detect early signs of the condition.
- Polycystic kidney disease, a range of genetic disorders
- Glomerulonephritis, also called nephritis and nephrotic syndrome, is a condition which damages the glomeruli and can be caused by strep throat and lupus, among other conditions
- Inflammation of the kidneys
- Repeated kidney infections and frequent kidney stones
People who have some malformation of their kidneys or urinary tract are at higher risk of eventually developing chronic renal failure. Once the kidneys have lost a significant amount of function, they may not be able to recover, and the person may progress to end-stage renal disease.
Diagnosis of chronic renal failure
Chronic renal failure can be diagnosed by measuring kidney function and is typically tested for by taking blood and urine samples to measure creatinine levels. This is a waste product of creatine, which is a chemical the body produces to supply energy, primarily to muscles and the brain.
- Glomerular filtration rate (GFR): Checks how well the glomeruli are working. To check the filtration rate, a blood sample is taken which is then tested in a lab. The results are combined with factors including age, ethnicity, gender, height and weight to estimate a person’s glomerular filtration rate.
- Creatinine clearance test: Another way of calculating the glomerular filtration rate. To perform the test, a person needs to collect all their urine for a 24 hour period and then provide a blood sample. Comparing creatinine levels in the blood and urine allows a person’s glomerular filtration rate to be estimated.
If a person has a glomerular filtration rate of less than 60mL/min/1.73m2 for three months or more, they are classed as having chronic renal failure or kidney damage. Normal results are in the 90mL/min/1.73m2 to 120mL/min/1.73m2 range.
Additionally, an ultrasound of the kidneys and urinary tract may be necessary. In some cases, it may be necessary to take a small sample of the kidney (a biopsy) in order to find the underlying cause for the condition.
Diabetics should have regular microalbumin tests in addition to other tests. This test is used to detect very small levels of albumin, a protein usually found in the blood, in the urine. If the kidneys are damaged, albumin leaks into urine.
Prevention of chronic renal failure
Good control of medical conditions such as hypertension and diabetes is important in preventing chronic renal failure.
- Regular health check-ups, including evaluation of kidney function in high risk populations
- Losing weight
- Taking regular exercise, which can help regulate blood pressure and blood sugar levels
- Eating a healthy diet
- Stopping smoking
- Drinking less alcohol
- Taking all prescribed medication as directed
- Avoiding certain over-the-counter painkillers such as Aspirin or Ibuprofen
Treatment of chronic renal failure
Treatment involves controlling the condition that is harming the kidneys. In particular, people with hypertension or diabetes should make sure that these conditions are well controlled.
Keeping blood sugar and blood pressure under control will slow down further kidney damage. Angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs) are the preferred option for managing hypertension.
Some over-the-counter medications, including vitamins and herbal supplements, can worsen chronic renal failure. It may be helpful to review medications with a doctor and replace or stop any medications which can damage the kidneys.
Other medical conditions involving the kidneys can be managed with the help of a nephrologist (a specialist kidney doctor).
If chronic renal failure is diagnosed early and carefully managed; this may help to prevent the condition from worsening and progressing to end-stage renal failure. People with kidneys that no longer work well enough to filter blood and fluid may need dialysis, a process in which the blood is cleaned by a machine. Everyone with end-stage renal failure should be evaluated for a kidney transplant.
Chronic renal failure FAQs
Q: What diet should I eat for chronic renal failure?
A: Eating healthily can help slow the progression of chronic renal failure. Eating a diet that contains plenty of fruit and vegetables, is low in fat, cholesterol, salt and potassium, is advisable. Be aware that white beans, bananas, avocados and potatoes contain high amounts of potassium. For diabetics, maintaining blood sugar levels is important.
Other names for chronic renal failure
- Chronic kidney failure
Centers for Disease Control and Prevention. “Chronic Kidney Disease Initiative: Prevention & Risk Management.” December 2017. Accessed May 17, 2018. ↩