Primary hyperaldosteronism vs Secondary and tertiary hyperaldosteronism
How to tell Primary hyperaldosteronism and Secondary and tertiary hyperaldosteronism apart when a board question makes them look alike.
Primary is aldosterone-high renin-low; secondary is aldosterone-high renin-high; tertiary is autonomous aldosterone after long stimulation.
Side by side
Autonomous aldosterone excess from adrenal adenoma or bilateral hyperplasia causing hypertension, hypokalemia, metabolic alkalosis, high aldosterone, and suppressed renin.
Secondary hyperaldosteronism is renin-driven aldosterone excess from low renal perfusion; tertiary is autonomous aldosterone after chronic renin-angiotensin stimulation.
Adrenal zona glomerulosa secretes aldosterone independent of renin, expanding volume and suppressing renal renin release.
Renal hypoperfusion or low effective arterial volume raises renin and angiotensin II; prolonged stimulation can rarely become autonomous.
High aldosterone-to-renin ratio, low renin, hypokalemia, metabolic alkalosis, and resistant hypertension support primary hyperaldosteronism.
High renin with high aldosterone supports secondary hyperaldosteronism; persistent aldosterone autonomy after chronic stimulation suggests tertiary disease.
The trap
Aldosterone can be high in all three, so renin level and clinical trigger decide the type.
The repair move
For aldosterone excess, read renin first: suppressed renin means adrenal autonomy, high renin means upstream drive.
Try a free question
CoreA patient has resistant hypertension, muscle cramps, potassium of 2.7 mEq/L, metabolic alkalosis, high aldosterone, and suppressed plasma renin. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Primary hyperaldosteronism. High aldosterone with suppressed renin points to adrenal autonomy in primary hyperaldosteronism.
Why the other choices are tempting
- B. Secondary hyperaldosteronism should have high renin.
- C. Tertiary hyperaldosteronism requires autonomy after chronic stimulation and is less direct than primary disease here.
- D. Renal artery stenosis raises renin and then aldosterone.
- E. Primary adrenal insufficiency causes low aldosterone with hypotension and hyperkalemia.
Flashcards
Tap a card to flip it.
What renin pattern points to primary hyperaldosteronism?
Suppressed renin with high aldosterone points to primary hyperaldosteronism.
What renin pattern points to secondary hyperaldosteronism?
High renin with high aldosterone points to secondary hyperaldosteronism.
Quick answers
What is the fastest way to tell Primary hyperaldosteronism from Secondary and tertiary hyperaldosteronism?
Primary is aldosterone-high renin-low; secondary is aldosterone-high renin-high; tertiary is autonomous aldosterone after long stimulation.
What is the key clue for Primary hyperaldosteronism?
Autonomous aldosterone excess from adrenal adenoma or bilateral hyperplasia causing hypertension, hypokalemia, metabolic alkalosis, high aldosterone, and suppressed renin.
What is the key clue for Secondary and tertiary hyperaldosteronism?
Secondary hyperaldosteronism is renin-driven aldosterone excess from low renal perfusion; tertiary is autonomous aldosterone after chronic renin-angiotensin stimulation.
What is the common trap with Primary hyperaldosteronism vs Secondary and tertiary hyperaldosteronism?
Aldosterone can be high in all three, so renin level and clinical trigger decide the type.