1. Acute severe sodium subtraction (20–25% of total exchangeable sodium) before or during treatment with adrenocorticotrophic hormone (ACTH) does little to modify the increase in blood pressure induced by ACTH.

2. Chronic low salt diet, less than 5 mmol/day, abolishes the blood pressure increase, but the response can be restored by increasing the sodium intake to as little as 10 mmol/day.

3. 17α,20α-Dihydroxyprogesterone infused concurrently with other adrenal steroids will mimic ACTH hypertension and perhaps represents a new class of steroid capable of influencing btood pressure.

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