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

Where is the PKD1 gene located?

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

What is the function of polycystin-1?

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

What percentage of cases do mutations in PKD1 account for?

<p>85% (B)</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 (D)</p> Signup and view all the answers

Which type of cells express polycystin-1 predominantly?

<p>Tubular epithelial cells (A)</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 (A)</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. (D)</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. (B)</p> Signup and view all the answers

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

<p>1 in 400 to 1000 (B)</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. (B)</p> Signup and view all the answers

Why are unilateral cases of adult polycystic kidney disease rare?

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

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

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

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

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

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

<p>HIF-1 (D)</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 (B)</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 (C)</p> Signup and view all the answers

What is the histologic appearance of diffuse cortical necrosis?

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

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

<p>Shiga-like toxin (A)</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 (C)</p> Signup and view all the answers

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

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

What are the key characteristics of thrombotic microangiopathy?

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

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