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  • Title: Effects of tetracycline hydrochloride on pleurae in dogs with induced pleural effusion.
    Author: Gallagher LA, Birchard SJ, Weisbrode SE.
    Journal: Am J Vet Res; 1990 Oct; 51(10):1682-7. PubMed ID: 2240791.
    Abstract:
    Pleural effusion was induced in 12 dogs by ligation of the cranial vena cava. Pleurodesis was attempted by injecting a solution of tetracycline hydrochloride into the pleural space of 8 dogs (4 dogs, 25 mg/kg of body weight; 4 dogs, 50 mg/kg) via bilateral thoracostomy tubes. In both groups, tetracycline was diluted in 40 ml of normal saline solution and 10 ml of 1% lidocaine before injection. Half of the solution (25 ml) was instilled in each hemithorax. Four control dogs were treated in the same manner with a solution of normal saline and lidocaine. Daily pleural fluid production was measured after the attempted pleurodesis. Thirty days after administration of the solution, each dog was euthanatized and necropsied. Surface area of pleural adhesions was measured. Tissues from regions of pleural adhesions and areas of parietal and visceral pleura not involved in adhesions were analyzed histologically. Formation of pleural fluid stopped in all but 1 control dog within 48 hours after injection of solution. This dog effused throughout the study. The resolution of effusion was not significantly (P less than 0.05) different between the tetracycline-treated dogs and the control group. Although diffuse pleural adhesions were not induced in any of the dogs, significantly (P less than 0.0027) more surface area of lung was adhered in dogs treated with the higher dose of tetracycline.
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