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1 May 1996 | Volume 124 Issue 9 | Pages 820-824
Objective: To compare the effects of aerosolization of prostacyclin and its stable analog iloprost with those of nasal oxygen, inhaled nitric oxide, and intravenous prostacyclin on hemodynamics and gas exchange in patients with severe pulmonary hypertension.
Design: Open uncontrolled trial.
Setting: Justus-Liebig-University, Giessen, Germany.
Patients: 4 patients with primary pulmonary hypertension and 2 patients with severe pulmonary hypertension associated with calcinosis, the Raynaud phenomenon, esophageal dysfunction, sclerodactyly, and telangiectasia (the CREST syndrome). All were classified as New York Heart Association class III or class IV.
Intervention: Short-term applications of O2, inhaled nitric oxide, intravenous prostacyclin, aerosolized prostacyclin, and aerosolized iloprost during repeated catheter investigation of the right side of the heart within a 1-month period. One patient had long-term therapy with inhaled iloprost.
Results: Aerosolized prostacyclin decreased pulmonary artery pressure in 6 patients from (mean ± SE) 62.3 ± 4.1 mm Hg to 50.8 ± 5.5 mm Hg and reduced pulmonary vascular resistance from 1721 ± 253 dyne/s · cm–5 to 1019 ± 203 dyne/s · cm–5, and it increased cardiac output from 2.75 ± 0.21 L/min to 4.11 ± 0.54 L/min, mixed venous oxygen saturation from 51.1% ± 3.4% to 66.3% ± 4.1%, and arterial oxygen saturation from 90.6% ± 2.7% to 93.8% ± 23% (P < 0.05 for all changes). Mean systemic arterial pressure was only slightly affected. The responses lasted for 10 to 30 minutes after inhalation was terminated. Aerosolized iloprost had an identical efficacy profile but was associated with a longer duration of the pulmonary vasodilatory effect (60 min to 120 min). In comparison, intravenous prostacyclin reduced pulmonary vascular resistance with corresponding efficacy but produced a more pronounced decline in systemic artery pressure and no clinically significant decrease in pulmonary artery pressure. Nitric oxide and O2 were less potent pulmonary vasodilators in these patients. In one patient, 1 year of therapy with aerosolized iloprost (100 µg/d in six aerosol doses) resulted in sustained efficacy of the inhaled vasodilator regimen and clinical improvement.
Conclusion: Aerosolization of prostacyclin or its stable analog iloprost causes selective pulmonary vasodilatation, increases cardiac output, and improves venous and arterial oxygenation in patients with severe pulmonary hypertension. Thus, it may offer a new strategy for treatment of this disease.
Author and Article Information
From Justus-Liebig-University, Giessen, Germany.
BRIEF COMMUNICATION
Aerosolized Prostacyclin and Iloprost in Severe Pulmonary Hypertension
Acknowledgments: The authors thank Dr. R.H. Bodeker, Institute of Medical Statistics, for statistical discussion and Dr. R. Snipes, Institute of Anatomy, Justus-Liebig-University, Giessen, Germany, for linguistic revision of the manuscript.
Requests for Reprints: Werner Seeger, MD, Department of Medicine, Justus-Liebig-University, Klinikstrasse 36, D-35392 Giessen, Germany.
Current Author Addresses: Drs. Olschewski, Walmrath, Schermuly, Ghofrani, Grimminger, and Seeger: Department of Medicine, Justus-Liebig-University, Klinikstrasse 36, D-35392 Giessen, Germany.
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