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Myron H. Weinberger, MD; Naomi S. Fineberg, PhD

Arch Intern Med. 1993;153(18):2125-2129.

Abstract
Background
To develop a simple screening and diagnostic test for primary aldosteronism and to compare it with established techniques.

Design
Comparison of several techniques for screening, diagnosis, and differentiation of primary aldosteronism using normotensive and hypertensive subjects.

Methods
Four hundred thirty-four normotensive subjects, 263 essential hypertensive subjects, 48 subjects with primary aldosteronism due to a unilateral adrenal adenoma, and 14 in whom primary aldosteronism was associated with findings of bilateral hyperaldosteronism were studied. Plasma renin activity and plasma aldosterone were measured in venous blood obtained at 8 AM after 2 hours of ambulation and compared with established suppressive (plasma aldosterone) and stimulatory (plasma renin activity) maneuvers used for the diagnosis of primary aldosteronism.

Results
The ratio of plasma aldosterone to plasma renin activity provided complete separation of patients with primary aldosteronism from the normal and essential hypertensive groups. Moreover, based on the use of traditional localizing procedures separating unilateral hyperaldosteronism due to a solitary adenoma from bilateral hyperaldosteronism, confirmed by surgical intervention in the former subgroup, the ratio provided differentiation of these two forms of primary aldosteronism.

Conclusions
The use of the plasma aldosterone to plasma renin activity ratio appears to be useful in the screening, diagnosis, and differentiation of unilateral and bilateral forms of primary aldosteronism. These observations may also be applicable to patients receiving some antihypertensive medications.

(Arch Intern Med. 1993;153:2125-2129)

Author Affiliations
From the Hypertension Research Center, Department of Medicine, Indiana University School of Medicine, Indianapolis.

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