Antimicrobial Resistance in Cystic Fibrosis (CF)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00360503
Recruitment Status : Completed
First Posted : August 4, 2006
Last Update Posted : February 10, 2009
Cystic Fibrosis Foundation Therapeutics
Information provided by:
Seattle Children's Hospital

August 2, 2006
August 4, 2006
February 10, 2009
March 2006
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Complete list of historical versions of study NCT00360503 on Archive Site
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Antimicrobial Resistance in Cystic Fibrosis (CF)
Antimicrobial Resistance in Sputum Obtained From Patients With Cystic Fibrosis (CF)
People with cystic fibrosis (CF) often develop chronic pulmonary infections which are caused by a variety of organisms, the most predominant being Pseudomonas aeruginosa. Antibiotics are important in managing CF lung infections. Antibiotic use in CF was altered about ten years ago with the approval of inhaled tobramycin, an aminoglycoside which is effective in treating P. aeruginosa. A decade later, CF clinicians are increasingly concerned about the likelihood of induction of aminoglycoside-resistance with prolonged use of inhaled tobramycin to treat chronic P. aeruginosa airway infections. The goal of this study is to examine the current microbiology and susceptibility of organisms from CF sputum, correlate it with antibiotic use, and compare it with previous data.

Aminoglycosides are one of the mainstays of antibiotic therapy in CF. They are administered parenterally in synergistic combinations with β-lactam antibiotics for acute exacerbations and used by inhalation as single agents for chronic maintenance therapy. It is well known in CF and other chronic infections that chronic use of antibiotics results in resistance. Thus, the increasing use of aminoglycosides could have dramatically changed the microbiological epidemiology of CF, since it was last examined a decade ago. It will be important to determine the current prevalence of antibiotic resistance in CF pathogens. Current antimicrobial strategies may also be contributing to the increased rate of isolation of novel and difficult to treat organisms, including intrinsically antibiotic-resistant bacteria. These issues are important both for CF clinicians and for researchers developing new antimicrobials to be used in CF.

To determine if the prevalence of P. aeruginosa resistance and the prevalence of other CF pathogens has changed over the past ten years, this multi-center cross-sectional study will enroll a contemporary cohort of patients with CF and will compare their sputum microbiology and susceptibility data with corresponding baseline data from an historical cohort consisting of patients enrolled in the prior phase 3 trials of inhaled tobramycin, conducted by PathoGenesis Corporation. (A Phase III Placebo Controlled Clinical Trial (PC-TNDS-002) to Study the Safety and Efficacy of Tobramycin in Inhalation in Patients with Cystic Fibrosis). The data set from the phase 3 trials which will be used for this research project will be anonymous.

This current study will be coordinated by the CF research team at CHRMC and aims to enroll 520 patients at approximately 50 participating sites across the United States. The contemporary cohort will include patients with CF who are ages 6 years and older and able to expectorate sputum. Patients will be enrolled from many of the same CF centers that participated in the phase 3 trials of inhaled tobramycin, and eligibility criteria will be similar to those used in the phase 3 trials. Subjects enrolled in the contemporary cohort will have a single study visit to obtain a sputum sample that will be sent to a central laboratory for culture and susceptibility testing.

Observational Model: Case-Only
Time Perspective: Prospective
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Retention:   Samples With DNA
Bacterial isolates
Non-Probability Sample
Children and young adults with cystic fibrosis
Cystic Fibrosis
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Burns JL, Emerson J, Stapp JR, Yim DL, Krzewinski J, Louden L, Ramsey BW, Clausen CR. Microbiology of sputum from patients at cystic fibrosis centers in the United States. Clin Infect Dis. 1998 Jul;27(1):158-63.

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
June 2008
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Inclusion Criteria:

  • > 6 years of age.
  • Documented sweat chloride greater than 60 mEq/mL by quantitative pilocarpine iontophoresis test or homozygous for deltaF508 genetic mutation (or heterozygous for two well-characterized mutations) and one or more clinical features consistent with CF.
  • Most recent FEV1 between 25% and 75% predicted when clinically stable; must be obtained at or within 3 months prior to study visit.
  • P. aeruginosa present in the most recent sputum or throat culture obtained within 6 months prior to study visit.
  • Able to expectorate sputum on a routine basis.
  • Written informed consent provided.

Exclusion Criteria:

  • Administration of any anti-pseudomonal antibiotics by any route within 14 days prior to study visit.
  • Participation in a research protocol that potentially involves antibiotic treatment within 14 days prior to study visit.
  • Requiring treatment with intravenous or inhaled anti-pseudomonal antibiotics at study visit.
  • B. cepacia complex present in the most recent sputum or throat culture obtained within 6 months prior to study visit.
  • Post lung transplantation.
Sexes Eligible for Study: All
6 Years and older   (Child, Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
United States
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Jane L. Burns, MD, Seattle Children's Research Institute
Seattle Children's Hospital
Cystic Fibrosis Foundation Therapeutics
Principal Investigator: Jane L Burns, MD University of Washington and Children's Hospital and Regional Medical Center
Seattle Children's Hospital
February 2009