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Hypertension, Vol 5, 116-121, Copyright © 1983 by American Heart Association

ARTICLES

Similarity of idiopathic aldosteronism and essential hypertension. A statistical comparison

D McAreavey, GD Murray, AF Lever and JI Robertson

There is clinical, biochemical, and pathological evidence that idiopathic aldosteronism is part of a continuum which includes low- renin and normal-renin essential hypertension. In a retrospective statistical study, 89 patients with essential hypertension have been compared with 22 cases of idiopathic aldosteronism and 34 cases of aldosterone-secreting adrenal adenomas. Measurements of serum sodium, potassium, bicarbonate, and plasma angiotensin II concentrations and estimates of exchangeable sodium and potassium were obtained for individual patients. By using various combinations of these biochemical variables, a statistic, the Mahalanobis distance, was described for each of the three populations, essential hypertension, idiopathic aldosteronism, and adrenal adenomas. For each combination of variables, the distribution of the idiopathic aldosteronism group resembled that of the essential hypertension group more closely than that of the aldosterone-secreting adrenal adenoma group. Thus, the use of this statistical technique provides further evidence of the similarity of essential hypertension and idiopathic aldosteronism.

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