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J Clin Endocrinol Metab. 1979 Jul;49(1):87-91.

The significance of elevated levels of plasma 18-hydroxycorticosterone in patients with primary aldosteronism.


Plasma 18-hydroxycorticosterone (180HB) concentration was measured in 23 patients with primary aldosteronism. After overnight recumbency, the levels were markedly elevated and were 6 times higher in patients with aldosterone-producing adenomas than in patients with hyperplasia. A value of 100 ng/dl or greater at 0800 h after overnight recumbency distinguished an adenoma from hyperplasia. There was no overlap of values, as was observed with plasma aldosterone concentration (PAC) at 0800 h and after 4 h of upright posture at 1200 h. There was a significant negative correlation between the ratio of 180HB to PAC and the potassium concentration in patients with primary aldosteronism due to hyperplasia. Potassium repletion with potassium chloride and/or spironolactone in patients with aldosterone-producing adenomas decreased the 180HB:PAC ratio by decreasing 180HB and increasing PAC. 180HB is an effective discriminator of an adenoma and may be a useful marker of the events in late aldosterone synthesis.

[Indexed for MEDLINE]

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