Some Contributions to the Pharmacology of Synthetic Angiotensin
- 1 January 1962
- journal article
- abstracts
- Published by Wolters Kluwer Health in Circulation
- Vol. 25 (1), 193-199
- https://doi.org/10.1161/01.cir.25.1.193
Abstract
The examination of synthetic valyl-5-angiotensin II-amide in the conscious dog revealed the following: 1. Both the arterial and the central venous pressure responses exhibit tachyplylaxis when high doses of angiotensin II are administered, althoug not when medium or low doses are given. Cross-tachyphylaxis can be demonstrated between renin and angiotensin II but not between either of these and norepinephrine. These results suggest that tachyphylaxis to renin is due to tachyphylaxis to angiotensin. 2. Angiotensin II and norepinephrine provoke a dose-dependent increase in central venous pressure. The threshold dose is about 10 times higher than that necessary for the effect on arterial pressure. In doses eliciting the same increase of arterial blood pressure, norepinephrine is about twice as active on the venous pressure as angiotensin II. 3. Anesthesia and atropinization both reduce or abolish the effect of angiotensin II as well as that of norepinephrine on the venous pressure, indicating the reflex natur...Keywords
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