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Am. J. Respir. Crit. Care Med., Volume 156, Number 5, November 1997, 1692-1695

Factors Influencing Indoor Concentrations of Nitric Oxide in a Parisian Intensive Care Unit

ERIC MOURGEON, ERIC LEVESQUE, CLAIRE DUVEAU, JEAN-DOMINIQUE LAW-KOUNE, BENNY CHARBIT, ELISABETH TERNISSIEN, PIERRE CORIAT, and JEAN-JACQUES ROUBY

From the Surgical Intensive Care Unit, Department of Anesthesiology, Faculté de Médecine Pitié-Salpétrière, University of Paris VI, Paris, France

In low concentrations, inhaled nitric oxide (NO) increases arterial oxygenation in patients with severe acute respiratory distress syndrome. When present in the ambient atmosphere, NO and its oxidative derivate, nitrogen dioxide (NO2), are considered pollutants. The aim of this study was to assess whether the administration of inhaled NO to mechanically ventilated patients was associated with an increased risk of exposure to NO and NO2 for medical and paramedical staff. During a 1-yr period, indoor and outdoor NO and NO2 concentrations were measured using chemiluminescence in a 14-bed intensive care unit (ICU) to assess the possible influence of therapeutic NO administration on indoor pollution. Ambient concentrations of NO within the ICU were 237 ± 147 parts per billion (ppb) during periods of NO administration and 289 ± 147 ppb during periods without NO administration (mean ± SD, NS). Indoor concentrations of NO and NO2 were entirely dependent on outdoor concentrations and were mainly influenced by climatic conditions such as atmospheric pressure, mass of clouds, and speed of the wind. Therapeutic administration of concentrations of inhaled NO =< 5 ppm to critically ill patients did not affect the ambient concentration of NO and NO2 within the ICU, which was mainly dependent on the outdoor air pollution. As a consequence, scavenging of exhaust NO from the breathing circuit in the ventilator does not appear mandatory in ICUs located in areas with significant urban pollution when NO concentrations =< 5 ppm are administered.




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