The Science Journal of the American Association for Respiratory Care
BACKGROUND: Typically nitric oxide (NO) is delivered into a closed ventilator circuit ensuring adequate mixing. Injection of NO into an open system like an oxyhood might result in stratification of gases due to differing molecular weights or the production of unacceptable levels of nitrogen dioxide (NO2). The purpose of this study is to determine the feasibility of delivering NO via oxyhoods.
Methods: A 12
Results: Gas concentrations at various locations are given in the table for 40 ppm NO. These data are shown because they represent the maximum NO2 production and the greatest O2 dilution. In all experimental conditions, the mean difference in gas concentration among all locations was 1ppm. The lowest FIO2 and the highest NO2 were associated with the highest NO concentration.
|NO / NO2 ppm||back||middle||front|
|top||38 / 1.5||38 / 1.5||39 / 1.5|
|middle||39 / 1.5||39 / 1.5||39 / 1.5|
|bottom||38 / 1.6||39 / 1.6||39 / 1.5|
Conclusions: Injection of NO into an open oxyhood with an FIO2 = 0.40 results in homogenous distribution of NO and acceptable levels of NO2