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The renin-angiotensin-aldosterone system in patients with acromegaly was evaluated by infusing [sarcosine1, isoleucine8]angiotensin II, a competitive angiotensin II antagonist, into five acromegalic patients with hypertension and three normotensive acromegalics. The drug was infused at a rate of 600 ng/kg . min for 30 min, 1 h after iv injection of 40 mg furosemide. In addition, before the infusion, plasma samples were obtained for determination of PRA and plasma aldosterone concentration. A significant pressor response to [sarcosine1, isoleucine8]angiotensin II was observed in all eight patients. Preinfusion PRA and plasma aldosterone concentration were significantly lower than in normal controls. It is concluded that in acromegaly, the renin-angiotensin-aldosterone system is suppressed and that this system is probably not involved in maintenance of the high blood pressure observed in some acromegalic patients.
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