The effect of converting enzyme inhibition on the enhanced proximal sodium reabsorption induced by chronic diuretic treatment in patients with essential hypertension.

Abstract:

:During chronic chlorthalidone treatment of patients with essential hypertension, distal tubular sodium reabsorption is continuously inhibited. At the same time, sodium balance is maintained by an increase of the proximal tubular sodium reabsorption. In the present study, we investigated whether this increase is caused by a stimulated renin-angiotensin system (RAS). For this purpose, the renal effects of converting enzyme inhibition (CEI) were evaluated in 12 patients with essential hypertension who remained hypertensive despite chronic chlorthalidone treatment. After 6 weeks of chlorthalidone, an intravenous injection of 10 mg enalaprilic acid decreased the mean arterial pressure (MAP) from 110 to 102 mm Hg. The effective renal plasma flow (ERPF) increased. However, glomerular filtration rate (GFR) and the fractional excretions of sodium, lithium and free water did not change significantly. After 2 additional weeks of chlorthalidone combined with enalapril 20 mg b.i.d., MAP fell to 90 mm Hg, ERPF remained elevated and plasma aldosterone concentration decreased. As in the acute study, no significant changes were detected in the GFR and the fractional excretions of sodium, lithium or free water. Extracellular fluid volume was not diminished during these 2 weeks. Fractional proximal sodium reabsorption during chronic chlorthalidone therapy was higher when calculated from free water clearance (91%) than from the lithium clearance (71%), but neither of the two were affected by acute or chronic CEI. The results of this study suggest that during chronic diuretic treatment, maintenance of sodium balance by increased proximal reabsorption is not dependent on the stimulated RAS, or alternatively, that this function of the RAS is exactly counterbalanced by another effect of CEI, possibly by the fall in blood pressure.

journal_name

Nephron

journal_title

Nephron

authors

van Schaik BA,Geyskes GG,Dorhout Mees EJ

doi

10.1159/000184485

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

167-72

issue

3

eissn

1660-8151

issn

2235-3186

journal_volume

47

pub_type

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