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Original Article
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Volume 340:23-30 January 7, 1999 Number 1
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Intermittent Administration of Inhaled Tobramycin in Patients with Cystic Fibrosis
Bonnie W. Ramsey, M.D., Margaret S. Pepe, Ph.D., Joanne M. Quan, M.D., Kelly L. Otto, M.S., A. Bruce Montgomery, M.D., Judy Williams-Warren, M.P.H., Michael Vasiljev-K, B.S., Drucy Borowitz, M.D., C. Michael Bowman, M.D., Bruce C. Marshall, M.D., Susan Marshall, M.D., Arnold L. Smith, M.D., for The Cystic Fibrosis Inhaled Tobramycin Study Group

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ABSTRACT

Background and Methods We conducted two multicenter, double-blind, placebo-controlled trials of intermittent administration of inhaled tobramycin in patients with cystic fibrosis and Pseudomonas aeruginosa infection. A total of 520 patients (mean age, 21 years) were randomly assigned to receive either 300 mg of inhaled tobramycin or placebo twice daily for four weeks, followed by four weeks with no study drug. Patients received treatment or placebo in three on–off cycles for a total of 24 weeks. The end points included pulmonary function, the density of P. aeruginosa in sputum, and hospitalization.

Results The patients treated with inhaled tobramycin had an average increase in forced expiratory volume in one second (FEV1) of 10 percent at week 20 as compared with week 0, whereas the patients receiving placebo had a 2 percent decline in FEV1 (P<0.001). In the tobramycin group, the density of P. aeruginosa decreased by an average of 0.8 log10 colony-forming units (CFU) per gram of expectorated sputum from week 0 to week 20, as compared with an increase of 0.3 log10 CFU per gram in the placebo group (P<0.001). The patients in the tobramycin group were 26 percent (95 percent confidence interval, 2 to 43 percent) less likely to be hospitalized than those in the placebo group. Inhaled tobramycin was not associated with detectable ototoxic or nephrotoxic effects or with accumulation of the drug in serum. The proportion of patients with P. aeruginosa isolates for which the minimal inhibitory concentration of tobramycin was 8 µg per milliliter or higher increased from 25 percent at week 0 to 32 percent at week 24 in the tobramycin group, as compared with a decrease from 20 percent at week 0 to 17 percent at week 24 in the placebo group.

Conclusions In a 24-week study of patients with cystic fibrosis, intermittent administration of inhaled tobramycin was well tolerated and improved pulmonary function, decreased the density of P. aeruginosa in sputum, and decreased the risk of hospitalization.


Source Information

From the Department of Pediatrics, University of Washington School of Medicine, Seattle (B.W.R., J.W.-W., S.M.); the Department of Biostatistics, University of Washington School of Public Health, Seattle (M.S.P.); PathoGenesis, Seattle (J.M.Q., K.L.O., A.B.M., M.V.); the Department of Pediatrics, State University of New York, Buffalo, N.Y. (D.B.); the Department of Pediatrics, University of Southern California, Los Angeles (C.M.B.); the Department of Medicine, University of Utah, Salt Lake City (B.C.M.); and the Department of Molecular Microbiology, University of Missouri School of Medicine, Columbia (A.L.S.).

Address reprint requests to Dr. Ramsey at Children's Hospital and Regional Medical Center, CH-18, P.O. Box C-5371, Seattle, WA 98105.

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