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The effect of the central iso-renin angiotensin system on pressor responsiveness to angiotensin II.

The effect of intraventricular (IVT) infusion of a subpressor dose (6.25 or 12.5ng/kg/min) of angiotensin II (AII) on the pressor responses to intravenous (IV) infusion of All were studied in pentobarbital anesthetized rats. This study was undertaken to determine whether the central iso-renin angiotensin system alters pressor responsiveness to IV infused AII. Pressor responses to IV infusion of AII were potentiated by concurrent IVT infusion of a subpressor dose of AII. IVT pressor doses of AII decreased plasma renin activity, however, IVT subpressor doses of AII did not.These results suggest that the central iso-renin angiotensin system plays an important role in pressor responsiveness to IV AII and that the potentiation of IV AII is not related to decreases in endogenous AII as a result of IVT administered AII.