Angiotensin converting enzyme inhibition does not prevent the natriuretic effect of felodipine.

Abstract:

:The mechanism of natriuresis with calcium entry blockers such as felodipine is largely unexplained. As these drugs prevent sodium retention following exogenous angiotensin II, the natriuretic effect of felodipine might be due to a similar interaction with endogenous angiotensin II. In such a case, angiotensin converting enzyme inhibition with ramipril should prevent natriuresis with felodipine. We tested this hypothesis in a randomized, double-blind, crossover study in 12 male volunteers by comparing intravenous felodipine after 1 week of oral ramipril with felodipine after placebo and with solvent after ramipril. Ramipril pretreatment reduced ACE activity to 11 +/- 1%, lowered the blood pressure, and increased renal blood flow. However, ramipril pretreatment did not prevent the pronounced increase in natriuresis and diuresis with felodipine. Fractional sodium excretion only tended to increase less during felodipine after ramipril than during felodipine after placebo (absolute changes of + 1.2 +/- 0.2 and + 1.7 +/- 0.2%, respectively; p = 0.07). Ramipril did not influence the felodipine-mediated blood pressure reduction and renal vasodilation. In conclusion, ACE inhibition has no significant effect on the natriuretic and hemodynamic effects of felodipine, suggesting that mechanisms other than interaction with endogenous angiotensin II are involved in these effects of calcium entry blockers.

journal_name

J Cardiovasc Pharmacol

authors

van Hamersvelt HW,Wetzels JF,Kloke HJ,Koene RA,Huysmans FT

doi

10.1097/00005344-199303000-00018

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

471-7

issue

3

eissn

0160-2446

issn

1533-4023

journal_volume

21

pub_type

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