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You need to understand the RAA axis and you can answer all related questions.
Low volume state --> Renin --> Angiotensin --> Aldosterone

If the beginning of the problem is Aldosterone (primary hyperaldosteronism) then you will have low renin by negative feedback.

If the beginning of the problem is low volume state (secondary hyperaldosteronism) then your renin will be high.

That UW question can easily be answered following the sequence above.

Causes of secondary hyperaldosteronism include:

  • Renovascular hypertension - renal artery stenosis
  • Low volume states (congested liver in heart failure is an example)
  • Reninomas which secrete renin autonomously from the JG apparatus
 
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