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(Circulation. 2000;102:411.)
© 2000 American Heart Association, Inc.
Clinical Investigation and Reports |
Hemodynamic Effects of Bosentan, an Endothelin Receptor Antagonist, in Patients With Pulmonary Hypertension
From the Centre for Immunology (D.J.W., L.L.W., R.P.) and Heart and Lung Transplant Unit (A.M.K., P.S.M.), St Vincent’s Hospital, Darlinghurst; the Department of General Medicine (D.J.W.), Sir Charles Gairdner Hospital, Nedlands; and Roche Products Pty Ltd (F.S.), Dee Why, Australia; and Clinical Research (R.J., C.W.), F. Hoffmann–La Roche, Basel, Switzerland.
Correspondence to D.J. Williamson, Department of General Medicine, Sir Charles Gairdner Hospital, Nedlands, WA 6009, Australia. E-mail James.Williamson{at}health.wa.gov.au
Background—Few treatments are available for isolated pulmonary hypertension (PHT), which has a high morbidity and mortality. This trial was designed to assess the hemodynamic effects of bosentan, an endothelin receptor antagonist, in patients with PHT, in which local overproduction of endothelin-1 (ET-1) is thought to play a pathogenic role.
Methods and Results—An open-label, dose-ranging study was performed in 7 female patients with primary PHT (n=5) or isolated PHT associated with limited scleroderma (n=2). Infusions of 50, 150, and 300 mg were administered at 2-hour intervals, and the hemodynamic responses were measured. Bosentan caused a dose-dependent fall in total pulmonary resistance (-20.0±11.0%, P=0.01) and mean pulmonary artery pressure (-10.6±11.0%, P>0.05). However, there was also a fall in the systemic vascular resistance (-26.2±12.8%, P<0.005) and mean arterial pressure (-19.8±14.4%, P<0.001). There was a slight increase in cardiac index (15±12%, P>0.05) and a dose-dependent rise in ET-1 but no significant change in other hemodynamic variables, gas exchange, or other vasoactive mediators.
Conclusions—Intravenous bosentan is a potent but nonselective pulmonary vasodilator at the doses tested, even in patients resistant to inhaled nitric oxide. Transient increases in plasma ET-1 were observed, consistent with a blockade of endothelial ETB receptors. Systemic hypotension and other significant events during the study indicate that its intravenous use in patients with severe PHT may be limited. Implications for future trial design and studies of chronic oral treatment are discussed.
Key Words: hypertension, pulmonary • scleroderma • endothelin • trials
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