Abstract:
OBJECTIVES:To investigate the hemodynamic effects of the selective endothelin (ET)A receptor antagonist LU135252 in patients with congestive heart failure (CHF). BACKGROUND:Nonselective ET(A/B( receptor antagonists improve hemodynamics in patients with CHF. Since ET(B( receptors mediate the release of nitric oxide and the clearance of ET-1, selective ET(A) antagonists are of special interest. METHODS:The hemodynamic effects of a single oral dose of the selective ET(A) receptor antagonist LU135252 (1, 10, 30, 100 or 300 mg) were investigated in a multicenter study involving 95 patients with CHF (New York Heart Association II-III) with an ejection fraction < or = 35%. RESULTS:Baseline ET-1 positively correlated with pulmonary vascular resistance, pulmonary capillary wedge pressure (PCWP), and mean pulmonary artery pressure (MPAP, r = 0.37-0.50, p < 0.0004) but were inversely related to cardiac index (CI; r = -0.36, p = 0.0004). LU135252 dose dependently increased CI and decreased mean arterial pressure and systemic vascular resistance (p < 0.03-0.0002), while heart rate remained constant or decreased slightly. Pulmonary capillary wedge pressure, MPAP, pulmonary vascular resistance and right atrial pressure also decreased significantly (p < 0.035- < 0.0001). Two hours after LU135252, plasma ET-1 did not significantly increase after 1 mg but did so by 23% (p = 0.003), 29% (p = 0.0018), 56% (p < 0.0001) and 101% (p < 0.0001) after 10, 30, 100 and 300 mg, respectively, while plasma catecholamines remained constant. CONCLUSIONS:In patients with CHF, a single oral dose of the selective ET(A) receptor antagonist LU135252 improves hemodynamics in a dose-dependent manner without activation of other neurohumoral systems and is well tolerated over a wide dose range.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Spieker LE,Mitrovic V,Noll G,Pacher R,Schulze MR,Muntwyler J,Schalcher C,Kiowski W,Lüscher TFdoi
10.1016/s0735-1097(00)00649-5subject
Has Abstractpub_date
2000-06-01 00:00:00pages
1745-52issue
7eissn
0735-1097issn
1558-3597pii
S0735109700006495journal_volume
35pub_type
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