PMID: 6986949Feb 2, 1980Paper

Effects of an angiotensin-converting enzyme inhibitor (captopril) on blood pressure in anephric subjects

British Medical Journal
A J Man in 't VeldM A Schalekamp

Abstract

Randomised, double-blind cross-over trials were performed in seven anephric patients to determine the effect of the orally active angiotensin-converting enzyme inhibitor captopril on blood pressure in fluid-depleted and fluid-replete patients. Patients were given captopril, 100 mg orally, or placebo one hour after haemodialysis, when they were fluid depleted. Their mean (+/- SEM) supine blood pressure fell from 127 +/- 12/71 +/- 6 mm Hg before captopril to 106 +/- 13/54 +/- 4 mm Hg 24 hours after the drug, while on placebo it rose from 123 +/- 11/73 +/- 5 mm Hg to 134 +/- 10/82 +/- 8 mm Hg. All patients developed orthostatic hypotension after captopril. In the fluid-replete state, two days after haemodialysis, captopril had no effect on blood pressure. The plasma concentration of active renin was extremely low and did not rise after fluid withdrawal or captopril. Thus the hypotensive effect of captopril did not appear to depend on circulating renin concentrations. The concept of "renin-dependent" hypertension, which is responsive to captopril, as opposed to "volume-dependent" hypertension, which is not responsive to captopril, may therefore be invalid.

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