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- W2061519196 abstract "Cephalosporin antibiotics cause a variety of hematologic disturbances in man, the pathogeneses and hematopathology of which remain poorly characterized. There is a need for a well-defined animal model in which these blood dyscrasias can be studied. In four subacute toxicity studies, the intravenous administration of cefonicid or cefazedone to beagle dogs caused a dose-dependent incidence of anemia, neutropenia, and thrombocytopenia after 1-3 months of treatment. A nonregenerative anemia was the most compromising of the cytopenias and occurred in approximately 50% of dogs receiving 400-500 mg/kg cefonicid or 540-840 mg/kg cefazedone. All three cytopenias were completely reversible following cessation of treatment; the time required for recovery of the erythron (approximately 1 month) was considerably longer than that of the granulocytes and platelets (hours to a few days). Upon rechallenge with either cephalosporin, the hematologic syndrome was reproduced in most dogs tested; cefonicid (but not cefazedone)-treated dogs showed a substantially reduced induction period (15 +/- 5 days) compared to that of the first exposure to the drug (61 +/- 24 days). This observation, along with the rapid rate of decline in red cell mass parameters of affected dogs, suggests that a hemolytic component complicated the red cell production problem and that multiple toxicologic mechanisms contributed to the cytopenia. We conclude that the administration of high doses of cefonicid or cefazedone to dogs can induce hematotoxicity similar to the cephalosporin-induced blood dyscrasias described in man and thus provides a useful model for studying the mechanisms of these disorders." @default.
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- W2061519196 date "1987-08-01" @default.
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- W2061519196 title "The hematologic effects of cefonicid and cefazedone in the dog: A potential model of cephalosporin hematotoxicity in man" @default.
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- W2061519196 doi "https://doi.org/10.1016/0041-008x(87)90314-0" @default.
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