The change is irreversible and is due to loss of nephrons of the kidney. The nephrons are basic functioning units of the kidney and there are normally about one million nephrons in each kidney.In patients with Chronic Kidney Disease, the kidney is no longer able to clean toxins & waste product from blood and concentrate the urine
. By the time patients begin to experience symptoms of kidney failure, they would have lost most of their kidney function.
Simply, it can be interpreted as kidneys gradually stopping to work.
Classification of Chronic Renal Failure
Chronic renal failure is classified as follows:Hereditary:
Polycystic kidney disease, hereditary nephritis and some forms of glomerulonephritis
Like diabetes and hypertension
(forms about 50 to 60% of CRF).Urinary Tract Diseases:
Like reflux nephropathy, chronic obstruction of the bladder and neurogenic bladder
. Acute Renal Failure:
Untreated can proceed to a chronic state and cause chronic renal failure. Pain Killer drug usage over a prolonged period of time
can lead to kidney failure. These are classified as Non-Steroidal Anti Inflammatory Drugs (NSAIDs) by doctors. There is a long list of these drugs and the most common include aspirin
, Diclofenac, Piroxicam
, Mefenamic acid
These drugs are usually also called analgesics.
Symptoms of Chronic Renal Failure
The manifestations of chronic renal failure do not show up until there is profound loss of kidney function. This is because the kidney tries to compensate for loss of nephrons with over-activity in the remaining functional nephrons. But as the kidney deteriorates, every system of the body shows defects of which some of the below mentioned are important. Occasionally, it is discovered on routine blood test when the patient has minimum or no symptoms.
- Lungs - Breathing difficulties
- Non-specific symptoms like - Breath odor, high blood pressure or loss of appetite, poor sleep
- Gastrointestinal - Nausea, vomiting and metallic taste
- Skin - Generalized itching
- Increased or decreased frequency of urination
- Blood – Anemia and bleeding
- Neurological - Cognitive impairment, seizures, muscular pain and weakness
- Bones – Brittle bones, tendency to fractures and skeletal abnormalities
- Cardiac - Chest pain
Risk of Developing in Chronic Renal Failure
As per data, it is most commonly seen in:
- Black males
- Those with high blood pressure
- Those on long term drug usage, mainly analgesics like NSAIDS or chronic use of acetaminophen
- Some patients with acute renal failure progress to chronic renal failure if inadequately treated
- Family history
- All age groups are susceptible to chronic renal failure, but increased incidence is seen with advancing age.
- Long standing diabetics (most common)
Diagnosis of Chronic Renal FailureChronic renal failure is diagnosed by the observation of a combination of symptoms, physical examination and elevated blood urea nitrogen (BUN) and creatinine (Cr) levels that are persistently present over at least 3 months
The following abnormalities found in the blood may signal CRF:
However patients with diabetic nephropathy often have preservation of kidney size despite CRF.
- Low red blood cell count and hemoglobin - Anemia
- Low blood level of calcium - Hypocalcemia
- High blood level of phosphate - Hyperphosphatemia
- High blood level of potassium - Hyperkalemia
- Low blood level of sodium - Hyponatremia
- Low blood level of bicarbonate
- Low plasma pH (blood acidity)
- High level of parathyroid hormone
- Proteinuria (excess protein in urine)
- Ultrasound may show that the kidneys are small in size
- CT scan and MRI might also help
Whether renal failure is acute or chronic usually can be distinguished by comparing prior test results (e.g., from the past several months or years). It is difficult to make the distinction without previous test results.
What are the stages of chronic kidney disease (CKD)?
Stages of Chronic Kidney Disease Stage or CKD depend in GFR Level
- In chronic kidney disease, the kidneys don't usually fail all at once. Instead, kidney disease often progresses slowly, over a period of years. This is good news because, if CKD is caught early, medications and lifestyle changes may help slow its progress and keep you feeling your best as long as possible.
- With early diagnosis, it may be possible to slow, stop, or even reverse CKD, depending on the cause. The National Kidney Foundation (NKF) published information on the stages of Chronic Kidney Disease (CKD). In the table below, the "GFR level," or glomerular filtration rate, is a measure of how well your kidneys are cleaning your blood. Your doctor can calculate your GFR, based on a formula.
Normal kidney function Healthy kidneys 90 mL/min or more
- Stage 1 Kidney damage with normal or high GFR 90 mL/min or more
- Stage 2 Kidney damage and mild decrease in GFR 60 to 89 mL/min
- Stage 3 Moderate decrease in GFR 30 to 59 mL/min
- Stage 4 Severe decrease in GFR 15 to 29 mL/min
- Stage 5 Kidney failure less than 15 mL/min or on dialysis
In Stage 1 and Stage 2 CKD, there are often few symptoms. Hence detection is difficult, but if diagnosed very favorable results are achieved. In Stage 3 CKD, anemia (a shortage of red blood cells) and/or early bone disease may appear and should be treated to help you feel your best and reduce problems down the road.When CKD has progressed to Stage 4, it's time to begin preparing for dialysis and/or a kidney transplant.
Laboratory Values Showing Kidney FailureCreatinine higher than normal
– A level higher than 6mg/dl might require dialysis Creatinine clearance
of less then 60ml/min is indicative of Chronic kidney disease. And less then 15ml/min means an advanced stage V CKD. This stage is also called End Stage Renal Disease.Glomerular Filtration Rate (GFR)
calculated from creatinine, age, sex, race -15 ml/min or lower.
Complications of Chronic Renal Failure
A spectrum of complications arises along with development of chronic renal failure.
Some of the important ones are as follows:
- End Stage Renal Disease (ESRD)
- Congestive Cardiac failure due to fluid overload
- Liver failure
- Bone weakness and fractures
- Increased susceptibility to infections and bleeding (ESRD)
- Sexual dysfunction and impotence
- Nervous disorders like seizures and delirium
Treatment for Chronic Renal Failure
Treatment aims at:
- Controlling the symptoms
- Minimizing complications
- Slowing the progression of the disease
Associated diseases that cause or result from chronic renal failure must be controlled.Hypertension, diabetes, congestive heart failure, urinary tract infections, kidney stones, obstructions of the urinary tract, glomerulonephritis, and other disorders should be treated as
appropriately and also treat the serum cholesterol if high.
Blood pressure should be less than 130/80 if there is CKD.If there is kidney disease due to diabetes or there is protein in the urine, the best blood pressure medications for treatment are angiotensin converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs).If there is CKD due to diabetes or if there is protein in the urine, it is best to take an ACE inhibitor or an ARB, even if your blood pressure is normal to postpone the end stage of the disease.Blood transfusions
or medications such as iron and erythropoietin supplements (to control anemia).Restriction of fluid intake -
often to an amount equal to the volume of urine produced.Decease dietary protein restriction
(0.6-0.8 gm/kg/day) may slow the build-up of wastes in the bloodstream and control associated symptoms such as nausea and vomiting.Salt, potassium, phosphorus
, and other electrolytes may be restricted.Dialysis or kidney transplant
may be required eventually.Psychosocial support
plays a major role in improving patient's quality of living.
Diabetes and Kidney Failure
Diabetes is the most common risk factor for kidney disease, but this does not mean that in all the diabetics, the kidneys will fail.Controlling your blood sugar
and getting regular urine tests to check for protein (microalbumin) levels help in early diagnosis of kidney disease among diabetics and hence regular checks and vigilance are a must.
Even if the kidney disease develops, doctors can keep the kidney working as long as possible.
Preventing Progression of Chronic Kidney Disease
There are many ways to help delay or prevent kidney failure, especially when CKD is diagnosed in the mild to moderate stages. These include:a. Blood pressure control
Normal blood pressure in adults over 18 years is less than 120/80.
People who have systolic or top number of blood pressure between 120 and 139, or between 80 and 89 for the diastolic or bottom number are prone to develop high blood pressure unless they measures to prevent it. In general, blood pressure that is at 140/90 or higher is considered high. This number is lower if there is diabetes or CKD and in this situation, the blood pressure of 130/80 or higher is considered high.
Two types of blood pressure medication
slow the action of angiotensin, a substance that may contribute to kidney disease progression.
Studies have shown that angiotensin converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs) can help slow progression of kidney disease in people with diabetes,
even if they do not have high blood pressure. The generic names of some common ACE inhibitors are captopril, ramipril, enalapril, and lisinopril.
Some common ARBs are losartan,telmisartan, olmesartan, candesartan, and valsartan.b. Controlling Blood Glucose in Diabetics
If you have diabetes, strict controls of your blood glucose levels
can help slow the progression of kidney disease. Keep your hemoglobin A1c, which measures blood glucose control over the last three months, to less than 6.5%.c. Reversing Kidney DiseaseUrinary Blockage or Infection -
In some cases, the kidney disease itself can be treated. If you have an obstruction that blocks your urine flow, surgery may help. If you have an infection, antibiotics may clear it up.Damage Due to Drugs -
If damage is due to the effects of prescription or non-prescription medications, your doctor may be able to suggest a different medication that is less harmful to your kidneys. If you have CKD and are prescribed antibiotics, talk to your doctor about the effect it may have on your kidneys. Painkillers
(even over-the-counter medicines) can cause damage your kidneys. Talk to your doctor about all medication you take. Sometimes diagnostic studies are ordered with contrast dye. It may be necessary for you to have the study, but first find out if there are alternative methods.Steroids and/or other immunosuppressive medications - Some diseases, such as IgA nephropathy, glomerulonephritis, and lupus
can cause kidney damage when your immune system overreacts and inflammation occurs. It is sometimes possible to slow the disease process by controlling the immune system with steroids and/or other immunosuppressive medications.d. Stop Smoking -
Smoking is a risk factor for faster progression of kidney disease, so stopping smoking can also help slow progression. Avoiding too much protein and phosphorus in the diet may help, as well.
Check with your doctor to find out whether any of these things might help slow the progress of your kidney disease.
Prognosis for Chronic Renal FailureCRF is often slow in its onset and progression. The rate of progression is variable, but usually renal function steadily declines resulting in end-stage renal disease (ESRD).
Once ESRD is reached, the patient requires renal replacement treatment in the form of dialysis or kidney transplantation
. If this is not provided, the patient's life is endangered due to fluid overload and accumulation of toxins in the blood.
Prevention of Chronic Renal Failure
There is no definite prevention modality available but, adequate control of diabetes, hypertension and other risk factors delay the onset of disease process in suspected individuals.
Regular screening for the disease in patients with risk factors can help diagnose the disease earlier and control it better.