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To elucidate the control mechanism of aldosterone production in primary aldosteronism, in vivo and in vitro studies were done in 7 patients with aldosterone-producing adenomas. In the in vivo study, plasma aldosterone was stimulated more significantly by (Formula: see text), synthetic ACTH than by angiotensin II or furosemide. Diurnal variations of plasma aldosterone, which were studied in 4 patients, were similar to those seen in normal controls. In agreement with the results in the in vivo study, the in vitro study also revealed ACTH stimulated aldosterone and deoxycorticosterone (DOC) from the adenoma more markedly than angiotensin II or III. There was no adenoma which was more sensitivie to angiotenion II or III than to ACTH. From these results it is considered that changes in plasma aldosterone induced by the exogenous administration of angiotensin II or ACTH in patients with aldosterone-producing adenoma are mainly based on changes in aldosterone production in the adenoma. Furthermore, in patients with an aldosterone-producing adenoma in whom diurnal variations of plasma aldosterone similar to those in normal subjects are observed, responses of aldosterone to angiotensin II are supposed to be less than those to ACTH.
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