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- W2068703796 abstract "Nitric oxide (NO) is a potent dilator of vascular smooth muscle that likely represents an important endothelium-dependent relaxing factor. Recent interest has focused on inhaled NO as a pulmonary vasodilator. The purpose of this study was to design a reliable NO delivery system with on-line monitoring of NO and nitrogen dioxide (NO2) concentrations, and to test the effects of inhaled NO in a dog model of acute hypoxic pulmonary vasoconstriction (HPV). Six canines were studied. Marked HPV was induced using a hypoxic gas mixture. Using a standard blender. NO was delivered through a volume-cycled ventilator. We were able to rapidly adjust the delivered NO concentration using this system. An on-line chemoluminescence analyzer was used to continuously measure NO and NO2 concentrations. Inhaled NO at 40 and 80 ppm for 30 min rapidly reversed HPV in all animals (PVR 502 +/- 154 dynes.s.cm-5 with hypoxia, 244 +/- 52 with 40 ppm NO, 227 +/- 47 with 80 ppm NO). No significant NO2 or methemoglobin production was noted during the study. We conclude that inhaled NO can be easily delivered through a ventilator and the dose rapidly adjusted, NO and NO2 concentrations can be monitored continuously on-line, inhaled NO rapidly reverses HPV in dogs, and with short-term NO inhalation, there is no significant NO2 or methemoglobin formation. Inhaled NO may, therefore, have a future clinical role as a new agent in the diagnosis and treatment of other forms of pulmonary hypertension." @default.
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- W2068703796 date "1994-06-01" @default.
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- W2068703796 title "Inhaled Nitric Oxide Reverses Hypoxic Pulmonary Vasoconstriction in Dogs" @default.
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- W2068703796 doi "https://doi.org/10.1378/chest.105.6.1842" @default.
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