What is Congenital Nephrotic Syndrome? Diagnosis & Treatment

Written by Medicover Team and Medically Reviewed by Dr Siddharth Herur , Nephrologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Congenital Nephrotic Syndrome (CNS) is a rare and serious kidney disorder that manifests at birth or within the first three months of life. It is characterized by high protein levels in the urine, low protein levels in the blood, swelling, and high cholesterol. Understanding the causes, symptoms, and treatment options is crucial for healthcare professionals and affected families. This article provides a comprehensive overview of Congenital Nephrotic Syndrome.

What are the Causes of Congenital Nephrotic Syndrome?

Congenital Nephrotic Syndrome typically results from genetic mutations affecting proteins that are essential for normal kidney function. The most common form, known as the Finnish type, is caused by mutations in the NPHS1 gene, which encodes nephrin, a protein vital for the kidneys' filtration barrier. Other genetic mutations involving the NPHS2 and WT1 genes can also cause Congenital Nephrotic Syndrome. These abnormalities impair the kidneys' ability to filter blood effectively, resulting in significant protein loss through the urine.

Genetic Factors

Congenital Nephrotic Syndrome is predominantly an inherited disorder. The Finnish type follows an autosomal recessive inheritance pattern, meaning a child must inherit one defective gene from each parent to develop the condition. Genetic counseling is recommended for families with a history of Congenital Nephrotic Syndrome to understand recurrence risks in future pregnancies.

Environmental and Other Influences

Although Congenital Nephrotic Syndrome is primarily genetic, certain environmental factors may worsen the condition. However, their exact role remains unclear and requires further research. Healthcare providers should consider both genetic and environmental influences when evaluating affected infants.

What are the Symptoms of Congenital Nephrotic Syndrome?

The symptoms of Congenital Nephrotic Syndrome usually appear during infancy and can be severe. Common symptoms include:

Edema: Swelling of the face, abdomen, hands, and legs caused by fluid retention.
Proteinuria: Excessive protein loss in the urine, detected through urine analysis.
Hypoalbuminemia: Low blood albumin levels that contribute to fluid imbalance and swelling.
Hyperlipidemia: Elevated cholesterol levels resulting from severe protein loss.

In addition to these symptoms, infants with Congenital Nephrotic Syndrome may experience poor growth, recurrent infections, delayed development, and an increased risk of blood clots due to abnormalities in blood coagulation.

Complications

If left untreated, Congenital Nephrotic Syndrome can lead to serious complications, including kidney failure, severe infections, malnutrition, blood clots, and cardiovascular problems. Early treatment is essential to improve survival and long-term health outcomes.

When to See a Doctor for Congenital Nephrotic Syndrome?

Congenital Nephrotic Syndrome is a rare inherited kidney disorder that usually develops within the first three months of life and causes excessive protein loss in the urine. Early diagnosis and treatment are essential to prevent severe complications such as infections, malnutrition, kidney failure, and poor growth.

If your child develops symptoms of Congenital Nephrotic Syndrome or has a family history of inherited kidney disorders, consult a Nephrologist for a comprehensive evaluation and specialized care.

Swelling of the face, eyelids, legs, feet, or abdomen (edema).
Foamy or frothy urine caused by excessive protein loss.
Poor weight gain or failure to thrive during infancy.
Persistent fatigue, irritability, or decreased activity levels.
Reduced urine output or changes in urination patterns.
Frequent infections, especially respiratory or urinary tract infections.
Poor appetite, vomiting, or feeding difficulties.
High blood pressure or signs of fluid overload.
A family history of Congenital Nephrotic Syndrome or inherited kidney disease.
Symptoms of dehydration, kidney dysfunction, or worsening swelling.

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How is Congenital Nephrotic Syndrome Diagnosed?

Diagnosing Congenital Nephrotic Syndrome involves a combination of clinical evaluation, laboratory investigations, and genetic testing. Early diagnosis is essential for effective treatment and long-term management.

Clinical Evaluation and Laboratory Tests

Diagnosis begins with identifying symptoms such as severe edema, followed by urine tests to detect proteinuria and blood tests to identify hypoalbuminemia. A kidney biopsy may occasionally be performed to assess structural abnormalities within the kidneys.

Genetic Testing

Genetic testing is essential for confirming Congenital Nephrotic Syndrome by identifying mutations in the NPHS1, NPHS2, WT1, or other associated genes. The results help determine the underlying cause, guide treatment decisions, and provide valuable information for family counseling.

How is Congenital Nephrotic Syndrome Treated?

Treatment requires a multidisciplinary approach involving Nephrologists, pediatricians, geneticists, and dietitians. The primary goals are to reduce symptoms, prevent complications, and improve quality of life.

Medical Management

Diuretics: Help reduce swelling by removing excess fluid from the body.
Albumin Infusions: Restore low blood albumin levels and reduce severe edema.
ACE Inhibitors: Help reduce protein loss in the urine and control blood pressure.
Antibiotics and Anticoagulants: Prevent infections and reduce the risk of blood clots.

Nutritional Support

A high-protein diet, vitamin supplementation, and careful monitoring of fluid and electrolyte balance help compensate for protein loss, support healthy growth, and prevent malnutrition.

Surgical and Advanced Interventions

In severe cases, dialysis may be required before kidney transplantation. Some children may undergo nephrectomy (removal of the kidneys) to control severe protein loss before transplantation.

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What is the Prognosis of Congenital Nephrotic Syndrome?

The prognosis of Congenital Nephrotic Syndrome depends on the specific genetic mutation, disease severity, and response to treatment. Early diagnosis and comprehensive care can significantly improve survival and quality of life. However, many affected children eventually develop end-stage renal disease (ESRD), requiring dialysis or kidney transplantation.

Long-Term Outlook

Advances in genetic research, targeted therapies, and kidney transplantation continue to improve outcomes for children with Congenital Nephrotic Syndrome. Ongoing research into gene therapy and innovative treatment approaches offers hope for more effective management in the future.