title: Renal hemodynamic and natriuretic effects of concomitant Angiotensin-converting enzyme and neutral endopeptidase inhibition in men.
abstract: This double-blind placebo-controlled study was designed to investigate the acute and sustained hormonal, renal hemodynamic, and tubular effects of concomitant ACE and neutral endopeptidase (NEP) inhibition by omapatrilat, a vasopeptidase inhibitor, in men. Thirty-two normotensive subjects were randomized to receive a placebo, omapatrilat (40 or 80 mg), or the fosinopril/hydrochlorothiazide (FOS/HCTZ; 20 and 12.5 mg, respectively) fixed combination for 1 week. Blood pressure, renal hemodynamics, urinary electrolytes and atrial natriuretic peptide excretion, and several components of the renin-angiotensin system were measured for 6 hours on days 1 and 7 of drug administration. When compared with the placebo and the FOS/HCTZ combination, omapatrilat induced a significant decrease in plasma angiotensin II levels (P<0.001 versus placebo; P<0.05 versus FOS/HCTZ) and an increase in urinary atrial natriuretic peptide excretion (P<0.01). These hormonal effects were associated with a significant fall in blood pressure (P<0.01) and a marked renal vasodilatation, but with no significant changes in glomerular filtration rate. The FOS/HCTZ markedly increased urinary sodium excretion (P<0.001). The acute natriuretic response to FOS/HCTZ was significantly greater than that observed with omapatrilat (P<0.01). Over 1 week, however, the cumulative sodium excretion induced by both doses of omapatrilat (P<0.01 versus placebo) was at least as great as that induced by the dose of FOS/HCTZ (P=NS versus FOS/HCTZ). In conclusion, the results of the present study in normal subjects demonstrate that omapatrilat has favorable renal hemodynamic effects. Omapatrilat combines potent ACE inhibition with a sustained natriuresis, which explains its well-documented potent antihypertensive efficacy.
authors.affiliation: Division of Hypertension and Vascular Medicine, CHUV, Lausanne, Switzerland.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Regamey
authors.forename: Marc
authors.initials: M
authors.lastname: Maillard
authors.forename: Jürg
authors.initials: J
authors.lastname: Nussberger
authors.forename: Hans R
authors.initials: HR
authors.lastname: Brunner
authors.forename: Michel
authors.initials: M
authors.lastname: Burnier
mesh_terms: D000328:Adult; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000494:pharmacology*; D000959:Antihypertensive Agents / Q000494:pharmacology*; D009320:Atrial Natriuretic Factor / Q000652:urine; D001794:Blood Pressure / Q000187:drug effects; D004311:Double-Blind Method; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D007668:Kidney / Q000187:drug effects* / Q000503:physiopathology; D007684:Kidney Tubules / Q000187:drug effects; D007700:Kinetics; D008297:Male; D009318:Natriuresis / Q000187:drug effects; D015260:Neprilysin / Q000037:antagonists & inhibitors*; D011480:Protease Inhibitors / Q000494:pharmacology*; D011725:Pyridines / Q000494:pharmacology*; D017595:Renal Plasma Flow / Q000187:drug effects; D012084:Renin-Angiotensin System / Q000187:drug effects; D012964:Sodium / Q000652:urine; D013841:Thiazepines / Q000494:pharmacology*
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D000959:Antihypertensive Agents; D011480:Protease Inhibitors; D011725:Pyridines; D013841:Thiazepines; C106266:omapatrilat; D009320:Atrial Natriuretic Factor; D012964:Sodium; D015260:Neprilysin