Resumo

BIANCHI PROVENZA, Domingo Arturo. Análisis de un sistema circular para administración de óxido nítrico en sala de operaciones. Anest Analg Reanim [online]. 2009, vol.22, n.1, pp.34-39. ISSN 1688-1273.

summary We study the function of a circular system of CO₂ absorption of reduced size, made up of canister of absorbed soda line and corrugated tubes of 35 cm. in length. A flow of new gas premixed 100% O2 and nitric oxide (NO)is introduced to it, in order to obtain a final concentration of 20 ppm of NO gas. We used the equipment available in the Service of Anesthesia, with oxygen flow from 2 to 8 l/min. The concentration of NO and nitrogen dioxide (NO₂) is measured in continuous form, by means of connection from the entrance of the premixed flow in the canister (sample site number 1) and of the end of the corrugated system (site of sample 2), to an electrochemical analyzer. Gases concentration in the operating room are analyzed at the end of the study. The results showed that with a flow superior than 6l/min, there are no exist significant differences in the concentration of NO measured in both sites of sample and that below 4 l/min the concentration of NO is in average 1 ± 0.2 ppm. greater in the sample site number 2. As the flow becomes smaller, the time of contact of the O2 with the NO is extend and the NO₂ generation increases in a 64% in the site of sample number 1, and in 20% in the sample site number 2. The environmental values of NO and NO₂ after 1 hour 45 minutes are 1.4 and 0.6 ppm,, lower than those accepted for environmental contamination : 25 and 3 ppm respectivelly. We concluded that the described system is more safe and effective for the administration of NO, and produced less generation of NO₂ and environmental contamination than those used commonly. The point is that it has to be used with flows greater than the addition of tidal volume to compliance components of the circuit.

Palavras-chave : Nitric oxide, circular system, absorption by soda lime.

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