Efficacy of Aerosolized Tobramycin in Patients with Cystic Fibrosis
Bonnie W. Ramsey, Henry L. Dorkin, Jay D. Eisenberg, Ronald L. Gibson, Ivan R. Harwood, Richard M. Kravitz, Daniel V. Schidlow, Robert W. Wilmott, Susan J. Astley, Mary Ann McBurnie, Kim Wentz, and Arnold L. Smith
Background Direct aerosol delivery of aminoglycosides such astobramycin to the lower airways of patients with cystic fibrosismay control infection with Pseudomonas aeruginosa and improvepulmonary function, with low systemic toxicity. We conducteda randomized crossover study to evaluate the safety and efficacyof aerosolized tobramycin in patients with cystic fibrosis andP. aeruginosa infections.
Methods Seventy-one patients with stable pulmonary status wererecruited from seven U.S. centers for the treatment of cysticfibrosis and randomly assigned to one of two crossover regimens.Group 1 received 600 mg of aerosolized tobramycin for 28 days,followed by half-strength physiologic saline (placebo) for two28-day periods. Group 2 received placebo for 28 days, followedby tobramycin for two 28-day periods. Pulmonary function, thedensity of P. aeruginosa in sputum, ototoxicity, nephrotoxicity,and the emergence of tobramycin-resistant P. aeruginosa weremonitored.
Results In the first 28-day period, treatment with tobramycinwas associated with an increase in the percentage of the valuepredicted for forced expiratory volume in one second (9.7 percentagepoints higher than the value for placebo; P<0.001), forcedvital capacity (6.2 percentage points higher than the valuefor placebo; P = 0.014), and forced expiratory flow at the midportionof the vital capacity (13.0 percentage points higher than thevalue for placebo; P<0.001). A decrease in the density ofP. aeruginosa in sputum by a factor of 100 (P<0.001) wasfound during all periods of tobramycin administration. Neitherototoxicity nor nephrotoxicity was detected. The frequency ofthe emergence of tobramycin-resistant bacteria was similar duringboth tobramycin and placebo administration.
Conclusions The short-term aerosol administration of a highdose of tobramycin in patients with clinically stable cysticfibrosis is an efficacious and safe treatment for endobronchialinfection with P. aeruginosa.
Source Information
From the Departments of Pediatrics (B.W.R., R.L.G., S.J.A., K.W., A.L.S.), Biostatistics (M.A.M.), and Epidemiology (S.J.A.), Schools of Medicine and Public Health and Community Medicine, University of Washington, and the Children's Hospital and Medical Center, both in Seattle; the Department of Pediatrics, Tufts University School of Medicine, Boston (H.L.D.); the Department of Pediatrics, Oregon Health Sciences University, Portland (J.D.E.); the Department of Pediatrics, University of California School of Medicine, San Diego (I.R.H.); the Department of Pediatrics, Temple University School of Medicine, Philadelphia (D.V.S.); and the Department of Pediatrics, University of Cincinnati, Cincinnati (R.M.K., R.W.W.).
Address reprint requests to Dr. Ramsey at the Cystic Fibrosis Program, Children's Hospital and Medical Center, 4800 Sand Point Way N.E., P.O. Box C-5371, Seattle, WA 98105.
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