questions 15

Nephritic Syndrome

Topic updated on 11/08/17 10:32am

Snapshot
  • A 14-year-old boy presents with hematuria, problems with vision, and deafness. Approximately 2 weeks prior to symptom development, he recovered from a viral upper respiratory tract infection. Family history is significant for deafness and early initiation of lisinopril in his father. His temperature is 99°F (37.2°C), blood pressure is 140/90 mmHg, pulse is 75/min, and respirations are 18/min. Physical examination is signifcant for anterior lenticonus and sensorineural hearing loss. Urinalysis demonstrates dysmorphic red blood cells and red blood cell casts. (Alport syndrome)
Introduction
  • Clinical definition
    • renal disease secondary to an inflammatory process injuring the glomerulus
      • this results in damage involving the
        • basement membrane
        • capillary endothelium
        • mesangium
  • Presentation
    • symptoms
      • hypertension
      • hematuria
      • oliguria
      • headache
    • physical exam
      • edema
        • can be peripheral and/or periorbital
  • Diagnosis
    • studies
      • complete blood cell count
        • anemia may be noted
      • azotemia
      • complement levels
        • C3, C4, and CH50 should be obtained
      • urinalysis
        • dysmorphic red blood cells (RBCs)
          • suggests hematuria is of glomerular origin
        • RBC casts
        • subnephrotic range proteinuria (< 3.5 g/day)
          • if the nephritic syndrome is severe enough it can lead to nephrotic range proteinuria (> 3.5 g/day)
    • renal biopsy
      • may be necessary to arrive to a definitive diagnosis and to determine prognosis
 
Nephritic Syndrome
Type
Pathophysiology
Renal Biopsy
Diagnostic Studies and Treatment
Acute poststreptococcal glomerulonephritis
  • Glomerulonephritis secondary to nephritogenic strains of streptococcus
    • type III hypersensitivity reaction
  • Light microscopy
    • glomerular hypercellularity
      • e.g., polymorphonuclear leukocytes 
  • Immunofluorescence
    • diffuse granular pattern on glomerular capillary walls and mesangium
      • deposition of IgG, IgM, and C3
  • Electron microscopy  
    • electron-dense, glomerular subepithelial immune-complex deposits ("humps")
  • Streptococcus titers and serologies are positive
  • ↓ serum C3 levels
  • Typically self-resolves
Rapidly progressive glomerulonephritis
  •  Goodpasture syndrome 
    • type II hypersensitivity
    • anti-GBM antibodies against α3-chain of collagen type IV
      • antibodies to the alveolar basement membrane result in hemoptysis and lung disease
  • Pauci-immune processes
    • granulomatosis with polyangiitis
    • microscopic polyangiitis
  • Light microscopy and immunofluoresence
    • crescent-shaped deposition of fibrin, C3b, glomerular parietal cells, monocytes, and macrophages
  • Granulomatosis with polyangiitis
    • PR3-ANCA/c-ANCA positive 
  • Microscopic polyangiitis
    • MPO-ANCA/p-ANCA
  • Corticosteroids and cyclophosphamide
IgA nephropathy (Berger's disease)
  • IgA immune-complex deposition in glomerular mesangial cells that results in its proliferation
    • patients present with hematuria and upper respiratory tract or gastrointenstinal infection
  • Light microscopy
    • mesangial proliferation
  • Immunofluoresence
    • IgA immune-complex deposition in the mesangium
  • ACE inhibitor or ARB for proteinuria and hypertension
Alport syndrome
  • Collagen type IV mutation that results in an abnormal basement membrane
    • more commonly an X-linked genetic disorder
    • characterized by
      • renal involvement
      • ocular involvement
      • sensorineural hearing loss
  • Electron microscopy
    • glomerular basement membrane lamellation
    • "basket weave" appearance
  • No curative treatment
Membranoproliferative glomerulonephritis (MPGN)
  • Immune-complex and/or complement protein deposition in the mesangium and subendothelium of the capillaries
    • this results in proliferation of the mesangium and remodeling of the capillary wall
    • may be secondary to
      • hepatitis C virus
      • hepatitis B virus
      • C3 nephritic factor
        • MPGN type II
  • Light microscopy
    • mesangial proliferation and thickening of the capillary wall
  • Immunofluoresence
    • "tram-track" appearance
  • ↓ serum C3 and C4 levels
  • Treat underlying disease in secondary causes
    • e.g., control of hepatitis C virus infection
 


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Qbank (8 Questions)

TAG
(M1.RL.11) Multiple patients present to your office with hematuria following an outbreak of Group A Streptococcus. Biopsy reveals that all of the patients have the same disease, characterized by large, hypercellular glomeruli with neutrophil infiltration. Which patient has the best prognosis? Topic Review Topic

1. 65-year-old nulliparous woman
2. 50-year-old man with a history of strep infection
3. 8-year-old boy who undergoes no treatment
4. 38-year-old man with sickle cell trait
5. 18-year-old man treated with corticosteroids

PREFERRED RESPONSE ▶
TAG
(M1.RL.32) A 9-year-old Caucasian girl presents to your office with hematuria. An electron micrograph of her renal biopsy is shown below in Figure A. Which of the following is the most likely composition of the structures marked by the white arrows? Topic Review Topic
FIGURES: A          

1. Albumin
2. Non-enzymatic glycosylation
3. IgA
4. IgG
5. IgG, IgM, C3

PREFERRED RESPONSE ▶
TAG
(M1.RL.35) A 6-year-old boy presents to your office with hematuria. Two weeks ago the patient had symptoms of a sore throat and fever. Although physical exam is unremarkable, laboratory results show a decreased serum C3 level and an elevated anti-DNAse B titer. Which of the following would you most expect to see on renal biopsy? Topic Review Topic

1. Large, hypercellular glomeruli on light microscopy
2. Polyclonal IgA deposition on immunofluorescence
3. Immune complex deposits with a "spike and dome" appearance on electron microscopy
4. Wirelooping and hyaline thrombi on light microscopy
5. Antibodies to GBM resulting in a linear immunofluorescence pattern

PREFERRED RESPONSE ▶
TAG
(M1.RL.67) A 21-year-old male presents to your office with hematuria 3 days after the onset of a productive cough and fever. Following renal biopsy, immunofluorescence shows granular IgA deposits in the glomerular mesangium. Which of the following do you suspect in this patient? Topic Review Topic

1. Lipoid nephrosis
2. Berger’s disease
3. Poststreptococcal glomerulonephritis
4. Systemic lupus erythematosus
5. HIV infection

PREFERRED RESPONSE ▶
TAG
(M1.RL.73) A 25-year-old male visits his primary care physician with complaints of hemoptysis and dysuria. Serum blood urea nitrogen and creatinine are elevated, blood pressure is 160/100 mm Hg, and urinalysis shows hematuria and RBC casts. A 24-hour urine excretion yields 1 gm/day protein. A kidney biopsy is obtained, and immunofluorescence shows linear IgG staining in the glomeruli. Which of the following antibodies is likely pathogenic for this patient’s disease? Topic Review Topic

1. Anti-DNA antibody
2. Anti-neutrophil cytoplasmic antibody (C-ANCA)
3. Anti-neutrophil perinuclear antibody (P-ANCA)
4. Anti-glomerular basement membrane antibody (Anti-GBM)
5. Anti-phospholipid antibody

PREFERRED RESPONSE ▶
TAG
(M1.RL.85) Three weeks after recovering from pharyngitis, a nine-year-old girl presents with periorbital edema and dark brown urine. An image of the kidney biopsy is shown in Figure A. What is responsible for these changes? Topic Review Topic
FIGURES: A          

1. Proliferation of glomerulus parietal cells with fibrin and C3b accumulation
2. IgA deposition and subsequent mesangial proliferation
3. Neutrophil infiltration in response to immune complex deposition along the glomerulus basement membrane and mesangium
4. Loss of negative charge on the glomerular basement membrane
5. Widespread intermembraneous deposits due to an autoantibody against C3 convertase

PREFERRED RESPONSE ▶
TAG
(M1.RL.86) A 37-year-old man presents with significant hematuria and hemoptysis. The results of the immunoflouresence are shown in Figure A. What pathologic changes would be expected under light microscopy? Topic Review Topic
FIGURES: A          

1. "Wire looping" of the capillaries
2. Hypercellular glomeruli
3. Crescentic glomerulonephritis
4. Focal proliferative glomerulonephritis
5. Normal glomeruli

PREFERRED RESPONSE ▶
TAG
(M1.RL.4671) A 62-year-old man presents to his primary care doctor complaining of recent-onset hemoptysis. He has not had any fevers, night sweats, or weight loss. He recently traveled to Italy with his wife. He has a 5 pack-year smoking history. On review of systems, he reports that his urine has been “red-tinged” for several months. Urinalysis reveals the findings shown in Figure A. He is referred to a nephrologist and undergoes a renal biopsy. Immunofluorescence staining of the biopsy is shown in Figure B. Which of the following is the most likely underlying pathogenesis of his disease? Topic Review Topic
FIGURES: A   B        

1. Type III hypersensitivity reaction
2. Antibodies to collagen type IV
3. Presence of C-ANCA
4. Mycobacterial infection
5. Metastatic malignancy

PREFERRED RESPONSE ▶
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