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The effects of angiotensin converting enzyme inhibitor (CEI) upon blood pressure and plasma aldosterone (PA) were studied in rabbits with a simultaneous infusion of angiotensin I (ANG I) or with hemorrhagic hypotension. Pretreatment with CEI (SQ 20881), 1.0 mg/Kg, inhibited the effects of infused ANG I, 30 ng/Kg/min, upon PA and blood pressure at 30 min of the infusion, but the inhibition on PA was not significant at 60 min of the infusion. The same dose of CEI was ineffective in blocking the effect of 100 ng/Kg/min of ANG I on PA and blood pressure even at 30 min of the infusion. In rabbits with hemorrhagic hypotension, injection of CEI resulted in the decrement in blood pressure, whereas no decrement in blood pressure was observed in normal control rabbits. This study suggests that CEI exerts it's effect in part by inhibiting conversion of ANG I to angiotensin II (ANG II), but this can't exclude other mechanisms.
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