Nephrotic syndrome is a kidney disorder in which the kidneys excrete (leak) too much protein in urine.

Nephrotic syndrome is usually caused by damage to the small filters in the kidneys, called nephrons, which filter waste and excess water from the blood. It causes swelling (edema) in the feet, face and sometimes the whole body and can increase the risk of infections and blood clots.

Treatment for nephrotic syndrome includes treating the underlying condition that is causing it. The condition may require medications and dietary changes to prevent these and other complications of nephrotic syndrome.

What are the symptoms of Nephrotic Syndrome?

Disease progression depends on many factors. Some factors which increase the risk are:

• Severe swelling (edema), particularly around the eyes and in the ankles and feet.
• Foamy or frothy urine, which may be caused by excess protein in the urine.
• Weight gain due to excess fluid retention.

Stages of Nephrotic Syndrome

Nephrotic syndrome progresses in stages marked by the level of protein leakage, kidney function, and severity of swelling and other complications. Early stages may show no symptoms, but as the condition advances, it can lead to significant fluid buildup, an increased risk of blood clots, and, if untreated, eventual kidney failure.

What are the Causes of Nephrotic Syndrome?

Nephrotic syndrome can result from various conditions that damage the nephrons, including:

• Minimal change disease: This is the most common cause of nephrotic syndrome in children, this disorder results in abnormal kidney function, but when the kidney tissue is examined under a microscope, it appears normal or almost normal.
• Focal segmental glomerulosclerosis: A serious progressive condition, the filtering membrane of the nephrons becomes thick and lumpy and tends to lose protein. This condition can frequently lead to kidney failure if not treated adequately
• Membranous nephropathy: This is the result of thickening of the membranes within the glomeruli (tiny kidney blood filters). The exact cause of the thickening isn't known, but it is sometimes associated with other medical conditions, such as Hepatitis B, Malaria, Lupus and Cancer.
• Diabetic kidney disease: Diabetes can lead to kidney damage (diabetic nephropathy) that affects the glomeruli and commonly lead to kidney failure.
• Systemic lupus erythematosus: An autoimmune disease that causes inflammation and damage to the kidneys.

How is Nephrotic Syndrome Treated?

Treatment aims to manage the underlying causes, control symptoms, and prevent complications. Medications commonly used include:

• Blood Pressure Medications: Angiotensin-converting enzyme (ACE) inhibitors or angiotensin II receptor blockers (ARBs) reduce protein leakage and lower blood pressure.
• Diuretics: Help manage edema by increasing fluid output from the kidneys (e.g., furosemide, spironolactone).
• Cholesterol-lowering Medications (Statins): Used to reduce cholesterol, though their effectiveness in nephrotic syndrome is not fully established.
• Blood Thinners: Anticoagulants, such as warfarin or heparin, help prevent blood clots.
• Immunosuppressants: Steroids and other immunosuppressive drugs (cyclosporine, tacrolimus) reduce immune activity and inflammation.

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Management of Nephrotic Syndrome

Managing nephrotic syndrome involves medication, dietary changes, and regular monitoring of kidney function. Key management strategies include:

• Dietary Modifications:
  • High protein diet (to offset the losses in urine).
  • Reduce the amount of fat and cholesterol in the diet to help control the blood cholesterol levels.
  • Low-salt diet to help control the swelling (edema) and blood pressure.
  • Fluid restriction depending on the amount of swelling.
• Lifestyle Adjustments:
  • Regular exercise helps maintain healthy blood pressure and weight.
  • Fluid restriction is based on the severity of swelling.

Nephrotic Syndrome in Children

Nephrotic syndrome is a kidney disorder that can also affect children, causing the kidneys to lose too much protein into the urine. In children, this syndrome is most often due to a condition called minimal change disease (MCD). In MCD, the kidney tissue appears normal when viewed under a microscope, yet the kidneys' function is impaired, leading to protein loss in the urine.

Nephrotic Syndrome Symptoms in Children

Nephrotic syndrome in children shares some symptoms with adults, though signs may be more intense. Common symptoms in children include:

• Severe swelling (edema): Noticeable around the eyes, ankles, and feet, especially prominent in the morning.
• Foamy urine: Excessive protein in the urine can give it a foamy appearance.
• Tiredness and fatigue: Children may seem less active or more tired than usual.
• Loss of appetite: Affected children may eat less and have reduced energy.
• Weight gain: Primarily due to fluid retention, not from an increase in body fat.
• Higher infection risk: Children with nephrotic syndrome are more vulnerable to infections, particularly bacterial ones.

Nephrotic Syndrome Causes in Children

The most common cause of nephrotic syndrome in children is minimal change disease (MCD). Occasionally, this condition may be triggered by infections, vaccinations, or allergens, though the exact cause often remains unknown. In rare cases, other conditions, such as focal segmental glomerulosclerosis (FSGS), can also lead to nephrotic syndrome in children.

Complications of Nephrotic Syndrome

Possible complications of nephrotic syndrome include:

• Blood clots: The inability of the glomeruli to filter blood properly can lead to loss of blood proteins that help prevent clotting. This increases the risk of developing a blood clot (thrombus) in the veins.
• High blood cholesterol and elevated blood triglycerides: When the level of the protein albumin in the blood falls, the liver makes more albumin. At the same time, the liver releases more cholesterol and triglycerides.
• Poor nutrition: Loss of too much blood protein can result in malnutrition. This can lead to weight loss, but it may be masked by swelling. May also lead to anemia and low levels of vitamin D and calcium.
• High blood pressure: Damage to the glomeruli and the resulting buildup of wastes in the bloodstream (uremia) can raise the blood pressure.
• Acute kidney failure: If the kidneys lose their ability to filter blood due to damage to the glomeruli, waste products may build up quickly in the blood. If this happens, emergency dialysis maybe needed.
• Chronic kidney disease: Nephrotic syndrome may cause the kidneys to gradually lose their function over time. Kidney function falls low enough, requiring dialysis or a kidney transplant.
• Infections: People with nephrotic syndrome have an increased risk of infections.

Pathophysiology of Nephrotic Syndrome

The kidneys typically filter out waste while retaining essential proteins. In nephrotic syndrome, damage to the glomeruli—the filtering units in the nephrons—causes proteins like albumin to leak into the urine. This leads to a series of complications:

• Loss of albumin results in fluid imbalance and edema.
• The liver compensates by producing more proteins, leading to elevated cholesterol levels.
• Loss of clotting factors increases the risk of thrombosis (blood clots).

What are the tests to diagnose diabetic nephropathy?

Possible complications of nephrotic syndrome include:

• Urine tests:
  • Complete urine examination will show protein or albumin as +++ or 4+ etc.
  • Urine (spot sample) protein creatinine ratio
  • 24-hour collection of urine for proteinuria
• Blood tests:
  • Blood tests may show
  • Low levels of the protein
  • Low albumin (hypoalbuminemia)
  • Increase in blood cholesterol and blood triglycerides
  • Increased serum creatinine and blood urea
  • Deranged serum electrolytes (sodium, potassium, calcium, magnesium)
• Kidney biopsy: The doctor may recommend a procedure called a kidney biopsy to remove a small sample of kidney tissue for testing. During a kidney biopsy, a special needle is inserted through the skin and into the kidney. Kidney tissue is collected and sent to a lab for testing.

Diet for Nephrotic Syndrome

Recommend that:

• High protein diet (to offset the losses in urine)
• Reduce the amount of fat and cholesterol in the diet to help control the blood cholesterol levels
• Low-salt diet to help control the swelling (edema) and blood pressure
• Fluid restriction depending on the amount of swelling