24.8: Nephrotic Syndrome II : Assessment and Medical Management

Introduction

Nephrotic syndrome is a kidney disorder marked by excessive protein loss in the urine, leading to various systemic complications. This condition often results from damage to the glomeruli—the kidney's filtering units—causing proteinuria, low blood protein levels, and fluid retention. Understanding the assessment, diagnosis, and management of nephrotic syndrome is essential for effective treatment and prevention of further kidney damage.

Assessment

• Patient History: Document any history of illness, family history of kidney disease, or autoimmune disorders, as these factors may predispose the patient to nephrotic syndrome.
• Physical Examination:
  • Edema: Check for generalized edema, particularly in the face, hands, and legs.
  • Blood Pressure: Hypertension is commonly observed in nephrotic syndrome due to fluid retention.
  • Urine Examination: Note changes in urine volume or appearance, such as foamy urine, often indicating proteinuria.
  • Other Symptoms: Common symptoms include fatigue, loss of appetite, and abdominal pain, often due to fluid accumulation and hypoalbuminemia.

Diagnosis

• Laboratory Tests:
  • Urine Tests:
    • Proteinuria: The primary diagnostic indicator is significant proteinuria, defined as total protein excretion exceeding 3.5 g/day. This is typically confirmed through a 24-hour urine collection or spot urine protein-to-creatinine ratio.
    • Urine Protein Electrophoresis and Immunofixation: In specific cases, urine protein electrophoresis and immunofixation may be used to further characterize the type of proteinuria.
    • Urine Microscopy: Urine microscopy may reveal elevated white blood cells, granular casts, or epithelial casts, suggesting renal injury or inflammation.
  • Blood Tests:
    • Serum Albumin: Low serum albumin levels (<3.5 g/dL) are characteristic of nephrotic syndrome.
    • Lipid Profile: Lipid levels are often elevated, reflecting secondary hyperlipidemia due to low serum albumin.
    • Creatinine and Blood Urea Nitrogen (BUN): These levels may be elevated in cases with renal impairment.
    • Electrolytes: These tests help detect imbalances, especially reductions in sodium or potassium levels.
  • Renal Biopsy: A kidney biopsy may be performed to confirm the diagnosis, especially if the underlying cause of the nephrotic syndrome is unclear or primary glomerular disease is suspected.

Medical Management

• Medications:
  • Diuretics: Loop diuretics, such as furosemide, are commonly prescribed to reduce edema.
  • ACE Inhibitors or ARBs: Medications like enalapril or losartan reduce proteinuria and help control blood pressure by lowering glomerular filtration pressure.
  • Antihyperlipidemics: Statins may be prescribed to manage elevated lipid levels associated with hyperlipidemia.
• Dietary Management:
  • Protein Intake: Moderate protein intake is advised, as excessive protein can worsen proteinuria.
  • Salt Restriction: Reducing salt intake helps decrease fluid retention and manage blood pressure.
  • Fluid Restriction: In severe cases of edema, fluid restriction may be recommended.
• Lifestyle Modifications: To support overall health management, encourage patients to regularly monitor their weight, check blood pressure, and adhere to a low-sodium, low-fat diet.