Nephrotic Syndrome

Expert diagnosis and treatment of nephrotic syndrome with comprehensive kidney care and personalized treatment plans from experienced nephrologists in Delhi.

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Overview

Nephrotic syndrome is a kidney disorder characterized by a group of symptoms that indicate damage to the glomeruli (filtering units) of the kidneys. It is defined by the presence of heavy proteinuria (protein loss in urine exceeding 3.5 grams per day), low blood albumin levels (hypoalbuminemia), generalized edema (swelling), and high cholesterol levels (hyperlipidemia). The syndrome can affect people of all ages but is most common in children between ages 2-6 and in adults over 40. It can be caused by a wide range of primary kidney diseases and systemic conditions. The hallmark of nephrotic syndrome is damage to the glomerular filtration barrier, which normally prevents large proteins like albumin from passing into the urine. When this barrier is damaged, large amounts of protein leak into the urine, leading to low blood protein levels. The kidneys respond by producing more lipoproteins, causing elevated cholesterol. The low albumin level reduces oncotic pressure in the blood vessels, causing fluid to leak into tissues and resulting in edema, particularly in the legs, ankles, and around the eyes. Treatment of nephrotic syndrome focuses on addressing the underlying cause, reducing proteinuria, managing edema, and preventing complications such as blood clots and infections. Corticosteroids are the mainstay of treatment for many primary causes, with immunosuppressive agents (cyclophosphamide, calcineurin inhibitors, rituximab) used for steroid-resistant cases. Dietary modifications include sodium restriction, moderate protein intake, and statins for hyperlipidemia. Blood pressure management with ACE inhibitors or ARBs is essential to reduce proteinuria and protect kidney function. Regular monitoring and a multidisciplinary approach are essential for optimal outcomes.

Causes

1Minimal change disease (most common cause in children)

2Focal segmental glomerulosclerosis (FSGS)

3Membranous nephropathy (most common cause in adults)

4Diabetic nephropathy

5Lupus nephritis

6Amyloidosis

7IgA nephropathy

8Membranoproliferative glomerulonephritis

9Infections (Hepatitis B and C, HIV, malaria)

10Certain medications (NSAIDs, lithium, penicillamine)

11Allergic reactions and toxins

12Hereditary conditions (Alport syndrome, Fabry disease)

Symptoms to Watch For

⚠Severe generalized edema (swelling) - face, legs, abdomen, ankles

⚠Foamy or frothy urine (due to protein)

⚠Rapid weight gain from fluid retention

⚠Loss of appetite

⚠Fatigue and weakness

⚠Difficulty breathing (if fluid accumulates in lungs)

⚠Abdominal pain and swelling (ascites)

⚠Skin discoloration and dryness

⚠Increased susceptibility to infections

⚠Blood clots (deep vein thrombosis, pulmonary embolism)

Risk Factors

●History of autoimmune diseases (lupus, rheumatoid arthritis)
●Diabetes mellitus
●Infections (Hepatitis B, C, HIV)
●Family history of kidney disease
●Obesity
●Certain medications and toxins
●Age (children 2-6 years and adults over 40)
●Male sex (for some causes like FSGS)
●Ethnicity (higher FSGS rates in African Americans)
●History of cancer (membranous nephropathy can be paraneoplastic)

Diagnosis

1Urinalysis showing heavy proteinuria (foamy urine, protein on dipstick)

224-hour urine collection or spot urine protein-to-creatinine ratio > 3.5 g/g

3Serum albumin level (typically less than 3.0 g/dL)

4Lipid panel showing elevated cholesterol and triglycerides

5Renal ultrasound to assess kidney size and structure

6Kidney biopsy (definitive diagnostic test - identifies the specific cause)

7Blood tests: creatinine, eGFR, electrolytes, fasting glucose

8Tests for underlying causes: ANA (lupus), Hepatitis B and C serologies, HIV test

9Serum and urine protein electrophoresis (to rule out amyloidosis, myeloma)

Treatment Options

Corticosteroids

Prednisone is the first-line treatment for most primary causes of nephrotic syndrome, especially minimal change disease. A typical course is 16 weeks or longer. Most patients with minimal change disease respond well to steroids.

Immunosuppressive Agents

For steroid-resistant or relapsing nephrotic syndrome: cyclophosphamide, calcineurin inhibitors (tacrolimus, cyclosporine), mycophenolate mofetil, or rituximab (anti-CD20 antibody).

ACE Inhibitors/ARBs

Ramipril, enalapril, losartan, valsartan reduce proteinuria and blood pressure, protecting kidney function. First-line for all nephrotic syndrome patients regardless of cause.

Diuretic Therapy

Loop diuretics (furosemide, torsemide) to manage fluid overload and edema. Dose adjusted based on kidney function and response.

Anticoagulation

Anticoagulants (warfarin, direct oral anticoagulants) for patients at high risk of blood clots, especially those with severe proteinuria or membranous nephropathy.

Statin Therapy

Statins (atorvastatin, rosuvastatin) to manage hyperlipidemia and reduce cardiovascular risk, which is elevated in nephrotic syndrome.

Dietary Management

Sodium restriction (less than 2,000 mg/day), moderate protein intake (0.8-1.0 g/kg/day), and dietary counseling from a renal dietitian.

Prevention & Lifestyle Tips

✓Manage underlying conditions (diabetes, lupus, infections)

✓Control blood pressure below 130/80 mmHg

✓Take prescribed medications consistently

✓Follow a low-sodium diet

✓Maintain a healthy weight

✓Exercise regularly as tolerated

✓Avoid nephrotoxic medications (NSAIDs)

✓Get regular kidney function monitoring

✓Stay hydrated

✓Treat infections promptly

Dietary Recommendations

🥗Limit sodium to less than 2,000 mg per day

🥗Moderate protein intake (0.8-1.0 g/kg/day) - do not over-restrict or over-supplement

🥗Limit saturated and trans fats

🥗Choose lean proteins (fish, chicken, legumes)

🥗Eat plenty of fruits and vegetables

🥗Stay hydrated (2-3 liters of water per day)

🥗Limit processed and fast foods

🥗Monitor and manage cholesterol with dietary changes

When to See a Nephrologist?

Consult a nephrologist if you notice persistent foamy urine, significant swelling in your legs or face, rapid unexplained weight gain, or if you have risk factors for kidney disease. Early treatment of nephrotic syndrome can prevent complications and improve outcomes.

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Frequently Asked Questions

Is nephrotic syndrome curable?

The prognosis depends on the underlying cause. Minimal change disease has an excellent prognosis with over 90% response to steroids. Other causes like FSGS and membranous nephropathy may be harder to treat and can progress to chronic kidney disease. With proper treatment, many patients achieve remission and maintain good kidney function.

What causes nephrotic syndrome in children?

The most common cause of nephrotic syndrome in children is minimal change disease, which responds very well to corticosteroid treatment. Other causes include focal segmental glomerulosclerosis and congenital nephrotic syndrome. Children typically have an excellent prognosis with appropriate treatment.

Can nephrotic syndrome cause blood clots?

Yes, nephrotic syndrome increases the risk of blood clots (thromboembolism) due to loss of anticoagulant proteins in the urine and increased production of clotting factors. The risk is highest in patients with severe proteinuria and low albumin levels. Anticoagulation may be needed in high-risk patients.

How is nephrotic syndrome treated?

Treatment depends on the underlying cause but generally includes corticosteroids (prednisone), immunosuppressive agents for steroid-resistant cases, ACE inhibitors or ARBs to reduce proteinuria, diuretics for edema, and statins for high cholesterol. Dietary sodium restriction and blood pressure control are essential.

Expert Nephrotic Syndrome Treatment

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