Acute Nephritic Syndrome

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Questions and Answers

What percentage of clinical cases of APSGN present with at least 2 manifestations of acute nephritic syndrome?

  • 95% (correct)
  • 80%
  • 100%
  • 90%

What is the typical timeline for antibody titers in patients with APSGN?

  • Elevated at 6 months, peaking at 1 year
  • Elevated at 1 week, peaking at 1 month (correct)
  • Elevated at 1 month, peaking at 3 months
  • Elevated at 3 months, peaking at 6 months

What is a common laboratory finding in patients with APSGN?

  • Low serum complement levels (correct)
  • Variable serum complement levels
  • Normal serum complement levels
  • Elevated serum complement levels

What percentage of patients with pharyngitis have positive antibody titers to extracellular products of streptococci?

<p>95% (D)</p> Signup and view all the answers

What is a possible finding on chest radiographs in patients with APSGN?

<p>Findings of congestive heart failure (C)</p> Signup and view all the answers

What is a urinalysis result in patients with APSGN?

<p>Always abnormal (A)</p> Signup and view all the answers

What is the hallmark of nephrotic syndrome?

<p>Massive proteinuria (D)</p> Signup and view all the answers

What is the cause of proteinuria in nephrotic syndrome?

<p>Glomerular structural damage (B)</p> Signup and view all the answers

What is the definition of nephrotic-range proteinuria in children?

<p>Protein excretion of more than 40 mg/m2/h (A)</p> Signup and view all the answers

What is the effect of decreased plasma oncotic pressure on the body?

<p>It leads to transudation of fluid into interstitium (A)</p> Signup and view all the answers

What is the difference between primary and secondary nephrotic syndrome?

<p>Primary is associated with glomerular diseases, while secondary is a renal manifestation of systemic diseases (B)</p> Signup and view all the answers

What is the effect of hypoalbuminemia on the body?

<p>It decreases plasma oncotic pressure (C)</p> Signup and view all the answers

What is a feature in the early phase of APSGN that suggests the need for renal biopsy?

<p>No rise in antistreptococcal antibodies (A)</p> Signup and view all the answers

What is a complication of APSGN in the acute phase?

<p>Congestive heart failure (B)</p> Signup and view all the answers

What is the goal of symptomatic therapy in APSGN?

<p>Control edema and blood pressure (D)</p> Signup and view all the answers

Why is salt and water restriction recommended in APSGN?

<p>To prevent edema and hypertension (D)</p> Signup and view all the answers

What is an indication for dialysis in APSGN?

<p>Life-threatening hyperkalemia (C)</p> Signup and view all the answers

How is streptococcal infection treated in APSGN?

<p>With oral penicillin G or erythromycin (D)</p> Signup and view all the answers

What is the short-term prognosis of APSGN in children?

<p>Favorable with fewer than 2% progressing to end-stage renal disease (B)</p> Signup and view all the answers

What may persist for several years after APSGN?

<p>Microscopic hematuria (D)</p> Signup and view all the answers

What is the recommended duration of steroid treatment for infrequent relapses?

<p>shorter duration than initial treatment (D)</p> Signup and view all the answers

What is the dose of prednisone given during the remission of proteinuria?

<p>1.5 mg/kg (40 mg/m2) on alternate days (D)</p> Signup and view all the answers

What is the definition of frequently-relapsing nephrotic syndrome (FRNS)?

<p>2 or more relapses within 6 months or three times or more within 1 year (D)</p> Signup and view all the answers

What is the recommended treatment for steroid-resistant disease and Focal Segmental GS?

<p>CSA (D)</p> Signup and view all the answers

How long is CYP (2 mg/kg daily) given orally for?

<p>8-12 weeks (D)</p> Signup and view all the answers

What is the definition of steroid-dependent nephrotic syndrome (SDNS)?

<p>2 or more consecutive relapses during tapering or within 14 days of stopping steroids (D)</p> Signup and view all the answers

When is a diagnostic renal biopsy performed in children with steroid-resistant disease?

<p>After 8 weeks of steroid therapy (A)</p> Signup and view all the answers

What is a common side effect of CYP treatment?

<p>All of the above (D)</p> Signup and view all the answers

What is the most common presenting symptom in children with nephrotic syndrome?

<p>Edema (C)</p> Signup and view all the answers

What percentage of childhood cases of nephrotic syndrome are caused by secondary causes?

<p>&lt; 10% (D)</p> Signup and view all the answers

Which of the following is a metabolic cause of secondary nephrotic syndrome?

<p>Diabetes mellitus (C)</p> Signup and view all the answers

What are the three laboratory tests required to confirm the presence of nephrotic syndrome?

<p>Nephrotic-range proteinuria, hypoalbuminemia, and hyperlipidemia (D)</p> Signup and view all the answers

What is Alport's syndrome?

<p>A type of hereditary nephropathy (A)</p> Signup and view all the answers

What is a common complication of nephrotic syndrome in children?

<p>Respiratory distress (A)</p> Signup and view all the answers

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Study Notes

Acute Poststreptococcal Glomerulonephritis (APSGN)

  • APSGN is the most frequent presentation of Acute Nephritic Syndrome (ANS)
  • ANS presents with edema, hematuria, and hypertension with or without oliguria
  • Approximately 95% of clinical cases have at least 2 manifestations, and 40% have the full-blown acute nephritic syndrome

Laboratory Studies

  • Evidence of preceding streptococcal infection:
    • Antibody titers to extracellular products of streptococci are positive in more than 95% of patients with pharyngitis and 80% of patients with skin infections
    • Antistreptolysin (ASO), antinicotinamide adenine dinucleotidase (anti-NAD), antihyaluronidase (AHase), and anti-DNAse B are commonly positive after pharyngitis
    • Antibody titers are elevated at 1 week, peak at 1 month, and fall toward preinfection levels after several months
  • Elevated BUN and creatinine values
  • Serologic findings: low serum complement levels
  • Urinalysis: results are always abnormal
  • Imaging Studies: chest radiographs may show findings of congestive heart failure

Treatment of Relapses

  • For infrequent relapses, steroids are resumed, although for a shorter duration than treatment during initial presentation
  • Prednisone, 2 mg/kg/d (60 mg/m2/d), is given as a single morning dose until the patient has been free of proteinuria for at least 3 days
  • Following remission of proteinuria, prednisone is reduced to 1.5 mg/kg (40 mg/m2) given as a single dose on alternate days for 4 weeks

Frequently Relapsing, Steroid-Dependent Disease, and Steroid-Resistant Disease

  • Frequently-relapsing nephrotic syndrome (FRNS) is defined as steroid-sensitive nephrotic syndrome (SSNS) with 2 or more relapses within 6 months or three times or more within 1 year period
  • Steroid-dependent nephrotic syndrome (SDNS) is defined as SSNS with 2 or more consecutive relapses during tapering or within 14 days of stopping steroids
  • For FRNS and SDNS, prednisone treatment is prescribed at 2 mg/kg/d (60 mg/m2/d) as a single morning dose until the patient has been free of proteinuria for at least 3 days
  • Steroid-resistant disease: children who continue to have proteinuria (2+ or greater) after 8 weeks of steroid therapy are considered steroid-resistant, and a diagnostic renal biopsy should be performed

Complications

  • Acute phase:
    • Congestive heart failure
    • Azotemia
    • Early death secondary to congestive heart failure and azotemia
  • Chronic phase:
    • Nephrotic-range proteinuria
    • Chronic renal insufficiency and end-stage renal disease

Management of APSGN

  • Medical Care:
    • Symptomatic therapy is recommended for patients with acute poststreptococcal glomerulonephritis (APSGN)
    • The major goal is to control edema and blood pressure
    • During the acute phase of the disease, restrict salt and water
    • For hypertension not controlled by diuretics, usually calcium channel blockers or angiotensin-converting enzyme inhibitors are useful
  • Prognosis:
    • The short-term prognosis of APSG in children is favorable
    • Fewer than 2% of children progress to end-stage renal disease
    • Hypertension and gross hematuria usually resolve over several weeks, although microscopic hematuria may persist for several years
    • Proteinuria resolves over several months

Nephrotic Syndrome

  • Definition:
    • Pediatric nephrotic syndrome is defined by the presence of nephrotic-range proteinuria, hypoalbuminemia, hyperlipidemia, and edema
    • Nephrotic-range proteinuria in children is protein excretion of more than 40 mg/m2/h
    • A urine protein/creatinine value of more than 2 mg/mg indicates nephrotic range proteinuria
  • Proteinuria:
    • The hallmark of NS is massive proteinuria
    • The cause of proteinuria is glomerular structural damage
  • Hypoalbuminemia:
    • Excessive loss of plasma protein into urine
    • Decreased plasma oncotic pressure leads to transudation of fluid into interstitium
  • Hypercholesterolemia:
    • Increased hepatic synthesis due to hypoalbuminemia and decreased oncotic pressure
    • Abnormalities in regulatory enzymes, such as lipoprotein lipase
  • Edema:
    • Decreased plasma oncotic pressure leads to transudation of fluid into interstitium

Etiology

  • Primary nephrotic syndrome (PNS) is associated with glomerular diseases intrinsic to the kidney and not related to systemic causes
  • Secondary causes account for < 10% of childhood cases
  • Examples of secondary causes:
    • Metabolic: as Diabetes mellitus
    • Immunologic: Henoch-Schönlein purpura, SLE
    • Drug-related: Interferon alfa, NSAIDs
    • Neoplastic: Leukemia, Lymphomas
    • Allergic: Antitoxins, Insect stings, Snake venoms
    • Bacterial: Infective endocarditis
    • Viral: Epstein-Barr virus infection, Hepatitis B and C

Clinical Manifestations

  • Edema is the presenting symptom in about 95% of children with nephrotic syndrome
  • Anorexia, irritability, fatigue, abdominal discomfort, and diarrhea are common
  • Respiratory distress can occur, due to either massive ascites and thoracic compression, frank pulmonary edema, or effusions
  • Children with nephrotic syndrome occasionally present with gross hematuria
  • Hypertension can be present

Laboratory Investigations

  • Laboratory tests should confirm:
    • Nephrotic-range proteinuria
    • Hypoalbuminemia
    • Hyperlipidemia

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