1. In nine normal volunteers, a series of five venous blood samples was obtained before and up to 24 h after converting enzyme inhibition by a single oral dose of enalapril or lisinopril. Plasma renin activity and blood angiotensin I were measured.

2. A close linear relationship was found between the increase in plasma renin activity and the increase in blood angiotensin I.

3. The linear correlation between plasma renin activity and blood angiotensin I remained after converting enzyme inhibition.

4. Thus, the rise in angiotensin I after inhibition of the conversion of angiotensin I to angiotensin II is due to an enhanced release of renin rather than to accumulation of angiotensin I.

This content is only available as a PDF.
You do not currently have access to this content.