Classification and Causes of Kidney Failure - Kidney failure can be classified as acute kidney failure or chronic kidney failure. - Acute kidney failure develops rapidly and may resolve, while chronic kidney failure develops slowly and can often be irreversible. - Symptoms of kidney failure include leg swelling, feeling tired, vomiting, loss of appetite, and confusion. - Complications of kidney failure include uremia, hyperkalemia, volume overload, heart disease, high blood pressure, and anemia. - Causes of kidney failure include low blood pressure, urinary tract blockage, certain medications, muscle breakdown, diabetes, high blood pressure, nephrotic syndrome, and polycystic kidney disease. - Acute kidney failure can result from prerenal, intrinsic, or postrenal causes. - Chronic kidney failure can also present as acute-on-chronic kidney failure, which may be reversible. - The most common causes of chronic kidney failure are diabetes mellitus and long-term, uncontrolled hypertension. - Polycystic kidney disease is another well-known cause. - Chronic kidney failure can also be a consequence of other diseases or conditions. - Drug overdoses or chemical overload can cause acute kidney injury, which may progress to chronic kidney failure. - Crush syndrome, resulting from the release of toxins after the relief of pressure on a compressed limb, can also lead to chronic kidney failure. - The APOL1 gene is a major genetic risk locus for renal failure in individuals of African origin. - Two western African variants in APOL1 are associated with end stage kidney disease in African Americans and Hispanic Americans.

Symptoms and Diagnostic Approach - Symptoms of kidney failure can vary from person to person. - Early stage kidney disease may not cause noticeable symptoms. - Azotemia, the accumulation of waste in the blood and body, can lead to symptoms. - Symptoms of kidney failure include high levels of urea in the blood, vomiting or diarrhea, nausea, weight loss, and acute kidney injury. - Acute kidney injury (AKI) occurs when the blood supply to the kidneys is suddenly interrupted or when the kidneys become overloaded with toxins. - Chronic kidney failure is measured in five stages based on the glomerular filtration rate (GFR). - Stage 1 CKD has mildly diminished renal function with few symptoms. - Stages 2 and 3 require increasing levels of supportive care. - Stage 4 and 5 kidney failure usually require active treatment such as dialysis or transplant. - GFR is considered the best overall index of kidney function. - Glomerular filtration rate (GFR) varies according to factors such as sex, age, body size, and ethnic background. - GFR is calculated using a serum creatinine level. - The National Kidney Foundation offers an online GFR calculator. - GFR is used to determine the stage of kidney failure. - A low GFR indicates reduced kidney function. - The renal failure index (RFI) is calculated by multiplying urine sodium by plasma creatinine and dividing by urine creatinine. - A renal failure index (RFI) greater than 3 is helpful in confirming acute renal failure. - The fractional sodium excretion (FENa) index is another urinary index used in diagnosing renal failure. - Both RFI and FENa scores are used to assess kidney function. - Abnormal RFI and FENa scores indicate renal dysfunction.

Management and Treatment of Kidney Failure - Protein diet restriction - Vegetarianism in chronic kidney disease patients - Safety of high-protein, vegetable-based diets for kidney function - Early referral to specialist nephrology services - Current medical diagnosis and treatment options

Complications of Kidney Failure - Cardiovascular disease - Anemia - Bone disease - Fluid overload - Electrolyte imbalances

Prevention of Kidney Failure - Control of arterial hypertension - Avoidance of nephrotoxic medications - Hygiene and prevention of hantavirus infection - Genetic testing for MYH9-associated nephropathy and ApoL1 gene mutations - Healthy lifestyle choices to maintain kidney health