Ciprofloxacin concentrations in lung tissue following a single 400 mg intravenous dose

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Abstract
Intravenous ciprofloxacin is frequently prescribed for the treatment of infections due to nosocomially acquired Gram-negative organisms, including those originating in the respiratory tract. In this study, the concentrations of ciprofloxacin in serum and lung tissue were determined by HPLC in patients undergoing lung surgery. A total of 22 patients scheduled for lung surgery received a single 400 mg iv dose of ciprofloxacin administered as a 1 h infusion. A specimen of healthy lung tissue was obtained from resected lung from 18 of the patients for analysis of ciprofloxacin concentration during the following time intervals after infusion (one sample/patient): 0- 2, 2- 4, 4- 8 and 8- 12 h. Corresponding mean serum and tissue concentrations were 2.37 mg/L and 3.84 mg/kg (0- 2 h), 1.18 mg/L and 1.92 mg/kg (2- 4 h), 0.69 mg/L and 1.77 mg/kg (4- 8 h), and 0.13 mg/L and 0.67 mg/kg (8- 12 h). Ciprofloxacin distributed rapidly to lung tissue, as seen by the high concentrations in the lung tissue as early as 2 h after infusion. Concentrations in lung tissue were generally higher than those in serum (tissue:serum ratios ranged from 1.7 to 7.1). The mean tissue concentrations found in this study remained above the MIC for most susceptible organisms.

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