Diagnosis and Management of Primary Hyperaldosteronism

Diagnostic Criteria

An aldosterone-to-renin ratio (ARR) greater than 20-30 is considered elevated and suggestive of primary hyperaldosteronism, with a sensitivity of over 90% when properly performed, particularly when serum aldosterone is >16 ng/dL and PRA is <0.6 ng/mL per hour, as recommended by the American Heart Association and American College of Cardiology 1, 2, 3, 4, 5
Patients should be potassium-replete and have normal serum potassium levels for accurate interpretation, with screening performed with morning collection and consideration of menstrual cycle timing in females, as recommended by the European Heart Journal and American College of Cardiology 6, 2, 7, 5
Medications such as beta-blockers, NSAIDs, ACE inhibitors, ARBs, and diuretics can affect plasma aldosterone-to-renin ratio (ARR) results, and should be considered when interpreting test results, as recommended by the American College of Cardiology 5

Adults with hypertension and a positive screening test for primary aldosteronism should be referred to a hypertension specialist or endocrinologist for further evaluation and treatment, as recommended by the American Heart Association and American College of Cardiology 1, 3
Indications for testing include resistant hypertension, hypokalemia, incidentally discovered adrenal mass, family history of early-onset hypertension, and stroke at a young age, as recommended by the American College of Cardiology/American Heart Association 6, 1, 3, 4
Confirmatory testing (e.g., fludrocortisone suppression test, saline infusion test) should be performed, and patients should be referred to a hypertension specialist or endocrinologist for further evaluation, as recommended by the American College of Cardiology/American Heart Association 2, 8, 3, 4

Imaging studies (e.g., computed tomography of the abdomen or non-contrast CT scan of adrenal glands, or MRI if CT is contraindicated) should be performed only after biochemical confirmation to identify adrenal nodules, as recommended by The Journal of Urology and the American College of Cardiology 8, 9, 5
Laparoscopic adrenalectomy is the treatment of choice for unilateral disease, improving blood pressure in virtually 100% of patients and achieving complete cure of hypertension in ~50%, as recommended by The Journal of Urology, American College of Cardiology, European Heart Journal, and Endocrine Society 9, 10, 5, 7
Medical therapy with mineralocorticoid receptor antagonists (spironolactone or eplerenone) is recommended for bilateral disease or non-surgical candidates, with monitoring for hyperkalemia, especially in patients with reduced renal function, as recommended by the European Heart Journal, American College of Cardiology, and Endocrine Society 10, 5, 7

Preoperative management includes continuing potassium supplementation, optimizing blood pressure control, and considering short-term spironolactone to improve potassium levels, according to the Endocrine Society guidelines 10
Postoperative monitoring after adrenalectomy includes assessing blood pressure, serum potassium levels, and resolution of hyperaldosteronism, with many patients still requiring some antihypertensive therapy, though at reduced doses, as recommended by the American Heart Association 10

With appropriate treatment, primary hyperaldosteronism has excellent outcomes, including reduction in blood pressure, normalization of potassium levels, reversal of left ventricular hypertrophy, and reduction in cardiovascular and renal complications, as reported by the American College of Cardiology, Endocrine Society, and European Society of Cardiology 5, 10
Regular monitoring of blood pressure, serum potassium levels, renal function, and signs of cardiovascular damage is recommended for patients with hyperaldosteronism, with titration of medication to achieve target blood pressure and monitoring for hyperkalemia, especially at initiation of therapy and with dose increases, as recommended by the American College of Cardiology and the European Society of Cardiology 10, 5

Primary aldosteronism is significantly underdiagnosed, with screening rates as low as 2-4% even in high-risk groups, according to the European Society of Cardiology 7
Adrenal vein sampling (AVS) is the gold standard for distinguishing between unilateral and bilateral aldosterone production and is recommended prior to offering adrenalectomy in patients with primary aldosteronism, particularly those with age >40 years, normal-appearing adrenal glands on imaging, or discordance between biochemical and imaging results 10, 5, 9
Multidisciplinary review is recommended when considering adrenal surgery, involving endocrinologists, surgeons, and radiologists, to determine the optimal treatment strategy and improve outcomes, as suggested by the American Urological Association 9