NSAIDs · Pharmacology

What is the primary mechanism by which NSAIDs cause renal impairment, especially in dehydrated patients?

  1. Direct toxicity to the proximal convoluted tubule
  2. Vasoconstriction of the afferent arteriole
  3. Vasodilation of the efferent arteriole
  4. Inhibition of the renal Na+/K+ ATPase pump
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Correct answer: Vasoconstriction of the afferent arteriole

Prostaglandins normally dilate the afferent arteriole to maintain glomerular filtration. By inhibiting these prostaglandins, NSAIDs cause afferent vasoconstriction, which can lead to acute kidney injury in states where renal perfusion is already compromised.

Difficulty: Medium Question 10 of 20

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