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Lack of correlation between the acute haemodynamic response to intravenous captopril and plasma concentrations of angiotensin II in patients with chronic cardiac failure

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Summary

We have given a series of incremental intravenous injections of captopril to ten patients with chronic cardiac failure.

Small doses of captopril produced significant changes in pulmonary artery end-diastolic pressure and right atrial pressure, up to a total cumulative dose of captopril of 2.5 mg, after which further injections had no significant effect. There were large changes in systemic vascular resistance and blood pressure up to a cumulative dose of captopril of 5.0 mg, after which the injection of larger doses caused no further significant changes.

Small doses of intravenous captopril produced large increases in plasma renin activity and plasma angiotensin I concentrations up to a total cumulative dose of captopril of 1.25 mg, after which there were no significant further changes in either plasma renin activity or plasma angiotensin I concentration. However the plasma concentration of angiotensin II fell more slowly, no further change being recorded after a total cumulative dose of captopril of 10 mg.

These results suggest that plasma renin activity is not the only determinant of plasma angiotensin II concentrations.

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Authors and Affiliations

  1. Departments of Cardiology and Medicine, Western General Hospital, Crewe Road, Edinburgh, Scotland, UK

    A. D. Flapan, T. R. D. Shaw, C. R. W. Edwards, M. Rademaker, E. Davies & B. C. Williams

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  1. A. D. Flapan
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  2. T. R. D. Shaw
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  3. C. R. W. Edwards
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  4. M. Rademaker
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  5. E. Davies
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  6. B. C. Williams
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Flapan, A.D., Shaw, T.R.D., Edwards, C.R.W. et al. Lack of correlation between the acute haemodynamic response to intravenous captopril and plasma concentrations of angiotensin II in patients with chronic cardiac failure. Eur J Clin Pharmacol 43, 1–5 (1992). https://doi.org/10.1007/BF02280745

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  • DOI: https://doi.org/10.1007/BF02280745

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