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- W34740527 abstract "The role of the renin-angiotensin system in the regulation of the systemic and coronary circulations during sodium depletion was studied in conscious normotensive dogs by i.v. administration of teprotide (0.5 mg/kg), an angiotensin-converting enzyme inhibitor, and saralasin (0.05-5 mug/kg per min), an angiotensin-receptor antagonist. Sodium depletion was produced by administering a low sodium diet and furosemide for 5 days. Administration of both teprotide and saralasin lowered systemic arterial blood pressure and total peripheral vascular resistance. Simultaneously, cardiac output increased, but left ventricular end-diastolic pressure, dP/dt, and dP/dt/P did not change significantly. Furthermore, both agents reduced diastolic coronary vascular resistance and increased coronary blood flow, but did not affect myocardial oxygen consumption, left ventricular work, or myocardial efficiency. These systemic and coronary vasodilator effects of teprotide and saralasin, however, were not observed in normal dogs on a regular sodium diet; in this group, the only effect noted was a slight increase in arterial pressure during saralasin infusion. Arterial plasma concentration of norepinephrine did not differ between normal and sodiumdepleted dogs, nor did it change significantly after teprotide administration. These results suggest that, during salt depletion, angiotensin II exerts an active vasoconstrictor action on the systemic and coronary vessels, but has no significant effects on myocardial contractility or energetics. It also appears likely that the increase in cardiac output observed in sodiumdepleted dogs after angiotensin inhibition was caused, at least in part, by the decrease in systemic arterial pressure." @default.
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- W34740527 date "1978-04-01" @default.
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- W34740527 title "Renin-Angiotensin System Inhibition in Conscious Sodium-Depleted Dogs" @default.
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- W34740527 doi "https://doi.org/10.1172/jci109013" @default.
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