Infused salbutamol accentuates acid-induced lung injury in the rat.
The effect in the rat of salbutamol infusion (1 microgram min-1 kg-1) on acid-induced lung injury has been determined. Severity of lung injury was assessed by two techniques: the pulmonary clearance of 99mTc-diethylenetriaminepenta-acetate (99mTc-DTPA) and the lung wet/dry weight ratio, giving indices of alveolar epithelial permeability and transendothelial water filtration respectively. Mean half-time of clearance of 99mTc-DTPA was increased significantly in rats who had intratracheal acid-induced injury and control (saline) intravenous infusion (19.4 +/- 2.6 min) compared with non-acid-treated rats (98.1 +/- 7.2) (P less than 0.0001). However, those animals who had intratracheal acid injury and subsequent salbutamol intravenous infusion had significantly faster clearance (11.5 +/- 1.9) than the acid and control infusion group (P less than 0.05). Gravimetric lung water in the acid-only rats (expressed as wet/dry weight ratio) was increased significantly (6.4 +/- 0.3) compared with the non-acid-treated controls (5.4 +/- 0.2) (P less than 0.01). Acid-treated rats who had salbutamol infused had dramatically increased lung water (10.0 +/- 0.6) (P less than 0.001 vs acid and control infusion). Intravenous salbutamol infusion itself produced no significant difference in the results for both techniques, compared with the non-acid-treated time-course controls. Infused salbutamol accentuates acid-induced lung injury in the rat. Possible factors responsible for these findings include beta 2-adrenergic agonist mediated inhibition of hypoxic pulmonary vasoconstriction (HPV) and a predominant beta 1-adrenergic agonist inotropic effect of salbutamol with resultant rise in pulmonary artery pressure.
D000420:Albuterol / Q000009:adverse effects*; D000818:Animals; D005260:Female; D006851:Hydrochloric Acid; D008168:Lung / Q000473:pathology; D009929:Organ Size; D004369:Pentetic Acid / Q000378:metabolism; D011654:Pulmonary Edema / Q000139:chemically induced* / Q000378:metabolism / Q000473:pathology; D051381:Rats; D011919:Rats, Inbred Strains; D013667:Technetium / Q000378:metabolism; D016284:Technetium Tc 99m Pentetate; D014867:Water / Q000378:metabolism
D014867:Water; D013667:Technetium; D004369:Pentetic Acid; D000420:Albuterol; D006851:Hydrochloric Acid; D016284:Technetium Tc 99m Pentetate