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Amiodarone-induced pulmonary toxicity in the rat

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Abstract

A rat model of amiodarone-induced pulmonary toxicity is described. The rats were fed, by gavage, 175 mg/kg/day of amiodarone hydrochloride suspended in methyl cellulose. Controls received methyl cellulose alone. Groups of rats were examined after 1, 3, 6, 9, and 12 weeks of feeding. We found that drug-fed rats had significantly more macrophages, neutrophils, and lymphocytes in the bronchoalveolar lavage (BAL). The early increase in cellularity was due to an increase in macrophages, and the macrophage count peaked after 6 weeks of drug treatment. The number of neutrophils in the experimental animals remained high throughout the course of the experiment. An increasing number of lymphocytes was seen in the BAL between 6 and 12 weeks of drug treatment. Protein in the lavage fluid was significantly elevated after 12 weeks of amiodarone exposure. Histologic sections were abnormal after 3 weeks of drug treatment, characterized by interstitial thickening with accumulation of mononuclear cells and alveoli packed with large foamy macrophages. There was only minimal evidence of fibrosis. This model appears to be very similar to human amiodarone-induced pulmonary toxicity and should be useful for the study of the pathogenesis of amiodarone-induced toxicity.

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Authors and Affiliations

  1. Department of Medicine, Pulmonary Division, Albert Einstein Medical Center, Philadelphia

    Barbara D. Wilson, Andrzej J. Jaworski, Marda E. Donner & Michael L. Lippmann

  2. Temple University School of Medicine, Pennsylvania, USA

    Barbara D. Wilson, Andrzej J. Jaworski, Marda E. Donner & Michael L. Lippmann

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  1. Barbara D. Wilson
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  2. Andrzej J. Jaworski
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  3. Marda E. Donner
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  4. Michael L. Lippmann
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Wilson, B.D., Jaworski, A.J., Donner, M.E. et al. Amiodarone-induced pulmonary toxicity in the rat. Lung 167, 301–311 (1989). https://doi.org/10.1007/BF02714959

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