Abstract
ABSTRACT The increase in plasma aldosterone and reduction in plasma renin activity induced by 30 to 60 minutes of mildly pressor angiotensin II infusion in man can be largely abolished when recent prior stimulation of the adrenal cortex by upright posture has been applied. A similar prevention of the ACTH-induced increase in plasma aldosterone can be achieved by previous upright ambulation. These results indicate the intermittent refractoriness of aldosterone secretion and that care must be exerted in the timing of any tests of aldosterone stimulation.
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