Renal Lesions in Malignant Hypertension Quiz
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Questions and Answers

What is a common pathogenic factor in the renal pathology of malignant hypertension and thrombotic microangiopathies?

  • Endothelial injury (correct)
  • Elevated angiotensin II levels
  • Increased renin production
  • Sodium retention
  • In cases of malignant hypertension, what percentage of cases may present with microangiopathic hemolytic anemia?

  • 50%
  • 10%
  • 30% (correct)
  • 20%
  • What is the primary cause of hypertension secondary to renal artery stenosis?

  • Sodium retention
  • Increased renin production (correct)
  • Endothelial injury
  • Elevated angiotensin II levels
  • Which experiments demonstrated that constriction of one renal artery in dogs leads to hypertension?

    <p>Goldblatt's experiments</p> Signup and view all the answers

    What effect does the reduction of angiotensin II activity have on individuals with renovascular hypertension?

    <p>Reduction of blood pressure</p> Signup and view all the answers

    Which factor contributes to the maintenance of renovascular hypertension after the renin-angiotensin system has initiated it?

    <p>Sodium retention</p> Signup and view all the answers

    Where is the PKD1 gene located?

    <p>Chromosome 16p13.3</p> Signup and view all the answers

    What is the function of polycystin-1?

    <p>Regulating cell-cell and cell-matrix interactions</p> Signup and view all the answers

    What percentage of cases do mutations in PKD1 account for?

    <p>85%</p> Signup and view all the answers

    At what age does the likelihood of developing renal failure reach more than 70% for individuals with mutations in PKD1?

    <p>70 years</p> Signup and view all the answers

    Which type of cells express polycystin-1 predominantly?

    <p>Tubular epithelial cells</p> Signup and view all the answers

    Why has the genetic diagnosis of Polycystic Kidney Disease been complicated?

    <p>Because of the variety of mutations in PKD1 and PKD2</p> Signup and view all the answers

    What is one of the reasons why renal cysts are considered important?

    <p>They are common and often pose diagnostic challenges.</p> Signup and view all the answers

    What is a major consequence of adult polycystic kidney disease?

    <p>It causes the destruction of the renal parenchyma.</p> Signup and view all the answers

    How common is autosomal dominant polycystic kidney disease among live births?

    <p>1 in 400 to 1000</p> Signup and view all the answers

    In autosomal dominant polycystic kidney disease, how many alleles of the involved genes need to be nonfunctional for the disease to develop?

    <p>Both alleles need to be functional.</p> Signup and view all the answers

    Why are unilateral cases of adult polycystic kidney disease rare?

    <p>Because it is typically bilateral.</p> Signup and view all the answers

    What is the inheritance pattern of autosomal dominant polycystic kidney disease?

    <p>(Autosomal) Dominant</p> Signup and view all the answers

    What is the role of the VHL gene in clear cell cancers?

    <p>Acts as a tumor suppressor gene</p> Signup and view all the answers

    What happens to HIF-1 levels when VHL is inactive?

    <p>They remain high</p> Signup and view all the answers

    Which transcription factor is targeted by the VHL protein for degradation?

    <p>HIF-1</p> Signup and view all the answers

    What is the consequence of high HIF-1 levels under normoxic conditions?

    <p>Increased expression of growth-promoting genes</p> Signup and view all the answers

    What is the key pathogenic abnormality in most cases of atypical HUS?

    <p>Activation of complement due to inherited mutations</p> Signup and view all the answers

    What is the histologic appearance of diffuse cortical necrosis?

    <p>Acute ischemic infarction</p> Signup and view all the answers

    What toxin is responsible for producing platelet activation and thrombosis in typical HUS?

    <p>Shiga-like toxin</p> Signup and view all the answers

    What type of necrosis is predominantly seen in massive ischemic necrosis affecting the renal cortex?

    <p>Coagulative necrosis</p> Signup and view all the answers

    Which factor permits the formation of abnormally large multimers of vWF in TTP?

    <p>ADAMTS13 deficiency</p> Signup and view all the answers

    What are the key characteristics of thrombotic microangiopathy?

    <p>Deposition of thrombi, red cell hemolysis, thrombocytopenia</p> Signup and view all the answers

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