Percentage of hypoaerated areas and representative CT images. (A) Percentage of hypoaerated areas of parenchyma measured on CT image obtained immediately after HCl instillation and at the end of experiment. Vehicle n = 9; ALD n = 7; AHD n = 6. (B) Representative CT images at the apical and basal level in Healthy rats, vehicle, ALD and AHD groups. Regions of interest for hypoaeration measurement in right lung are outlined.