Valutazione nel suino dell'effetto indotto dalla SO2 e NO2 sulle proprietà elastiche e resistive del sistema respiratorio

24 Large White pigs of 20±2 (D.S.) kg were used to study the effects of environmental pollutant gases NO2 and SO2 on viscoelastic characteristics of respiratory system. By the partition method it is possible to distinguish the tracheobronchial airways mechanic from the lung mechanic. The considered gases were administered at concentration of 50-100-200-400 ppm for NO2 and 50-100-500-700 ppm for SO2. The NO2 demonstrated to modify negatively the viscoelastic characteristics of the lung inducing a decrease of distensibility. The SO2 at higher concentrations exerts a lower effect than NO2.