Primary aldosteronism: a practical approach to diagnosis and treatment.
Primary aldosteronism (PA) may account for as many as 10%-14% of hypertension cases. The plasma aldosterone concentration/plasma renin activity ratio is a simple screening test for PA that should be performed in all patients with refractory/severe hypertension, spontaneous or provoked (by diuretics) hypokalemia, or a requirement for excessive potassium supplementation to maintain normokalemia. PA can be confirmed by a fludrocortisone suppression test or 24-hour urine collection for aldosterone. Confirmatory testing should be followed by high-resolution computerized tomography of the adrenal glands to distinguish bilateral hyperplasia or an adenoma. A solitary tumor greater than 1 cm in size in a younger patient is an indication for surgery; all other (nondiagnostic) findings should be followed by bilateral adrenal venous sampling (if available) to identify a unilateral cause of PA. Treatment for a lateralizing positive study is surgical; spironolactone or another mineralocorticoid receptor antagonist is the treatment of choice for a nonlateralizing study. If adrenal venous sampling is not readily available, patients may be successfully treated pharmacologically.
Thakkar
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Vascular Biology and Hypertension Program, Division of Cardiovascular Disease, University of Alabama at Birmingham School of Medicine, 703 19th Street South, Birmingham, AL 35294, USA.
Oparil
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D006801:Humans; D006929:Hyperaldosteronism / Q000175:diagnosis / Q000628:therapy