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Hyperbaric oxygen treatment increases killing of aggregating Pseudomonas aeruginosa isolates from cystic fibrosis patients

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  2. Seasonal fluctuation of lung function in cystic fibrosis: A national register-based study in two northern European populations

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  3. Antibody response against Mycobacterium avium complex in cystic fibrosis patients measured by a novel IgG ELISA test

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  4. Defining antimicrobial resistance in cystic fibrosis

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  5. The choice of lung function reference equation affects clinical trial eligibility: Results from a cystic fibrosis cohort

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  1. Primary ciliary dyskinesia patients have the same P. aeruginosa clone in sinuses and lungs

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  2. Is pseudarthrosis after spinal instrumentation caused by a chronic infection?

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  3. An Equine Wound Model to Study Effects of Bacterial Aggregates on Wound Healing

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  4. Analysis of proximal bone margins in diabetic foot osteomyelitis by conventional culture, DNA sequencing and microscopy

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BACKGROUND: Pseudomonas aeruginosa is a major pathogen of the chronic lung infections in cystic fibrosis (CF) patients. These persistent bacterial infections are characterized by bacterial aggregates with biofilm-like properties and are treated with nebulized or intravenous tobramycin in combination with other antibiotics. However, the chronic infections are close to impossible to eradicate due to reasons that are far from fully understood. Recent work has shown that re‑oxygenation of hypoxic aggregates by hyperbaric oxygen (O2) treatment (HBOT: 100% O2 at 2.8 bar) will increase killing of aggregating bacteria by antibiotics. This is relevant for treatment of infected CF patients where bacterial aggregates are found in the endobronchial secretions that are depleted of O2 by the metabolism of polymorphonuclear leukocytes (PMNs). The main objective of this study was to investigate the effect of HBOT as an adjuvant to tobramycin treatment of aggregates formed by P. aeruginosa isolates from CF patients.

METHODS: The effect was tested using a model with bacterial aggregates embedded in agarose. O2 profiling was used to confirm re‑oxygenation of aggregates.

RESULTS: We found that HBOT was able to significantly enhance the effect of tobramycin against aggregates of all the P. aeruginosa isolates in vitro. The effect was attributed to increased O2 levels leading to increased growth and thus increased uptake of and killing by tobramycin.

CONCLUSIONS: Re‑oxygenation may in the future be a clinical possibility as adjuvant to enhance killing by antibiotics in cystic fibrosis lung infections.

Original languageEnglish
JournalJournal of cystic fibrosis : official journal of the European Cystic Fibrosis Society
Volume18
Issue number5
Pages (from-to)657-664
Number of pages8
ISSN1569-1993
DOIs
Publication statusPublished - Sep 2019

ID: 58995108