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- W2013203824 abstract "Background Inhaled nitric oxide (No) selectively dilates the pulmonary vasculature and improves gas exchange in acute respiratory distress syndrome. Because of the very short half-life of NO, inhaled NO is administered continuously. Intravenous Zaprinast (2-o-propoxyphenyl-8-azapurin-6-one), a cyclic guanosine monophosphate phosphodiesterase inhibitor, increases the efficacy and prolongs the duration of action of inhaled NO in models of acute pulmonary hypertension. Its efficacy in lung injury models is uncertain. The authors hypothesized that the use of intravenous Zaprinast would have similar beneficial effects when used in combination with inhaled NO to improve oxygenation and dilate the pulmonary vasculature in a diffuse model of acute lung injury. Methods The authors studied two groups of sheep with lung injury produced by saline lavage. In the first group, 0, 5, 10, and 20 ppm of inhaled NO were administered in a random order before and after an intravenous Zaprinast infusion (2 mg/kg bolus followed by 0.1 mg. kg-1. min-1). In the second group, inhaled NO was administered at the same concentrations before and after an intravenous infusion of Zaprinast solvent (0.05 m NaOH). Results After lavage, inhaled NO decreased pulmonary arterial pressure and resistance with no systemic hemodynamic effects, increased arterial oxygen partial pressure, and decreased venous admixture (all P < 0.05). The intravenous administration of Zaprinast alone decreased pulmonary artery pressure but worsened gas exchange (P < 0.05). Zaprinast infusion abolished the beneficial ability of inhaled NO to improve pulmonary gas exchange and reduce pulmonary artery pressure (P < 0. 05 vs. control). Conclusions This study suggests that nonselective vasodilation induced by intravenously administered Zaprinast at the dose used in our study not only worsens gas exchange, but also abolishes the beneficial effects of inhaled NO." @default.
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- W2013203824 date "2000-08-01" @default.
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- W2013203824 title "Effects of Intravenous Zaprinast and Inhaled Nitric Oxide on Pulmonary Hemodynamics and Gas Exchange in an Ovine Model of Acute Respiratory Distress Syndrome" @default.
- W2013203824 doi "https://doi.org/10.1097/00000542-200008000-00021" @default.
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