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Am J Rhinol. 2007 Sep-Oct;21(5):527-32.

Methods for removing bacterial biofilms: in vitro study using clinical chronic rhinosinusitis specimens.

Author information

1
Centre Hospitalier de l'Université de Montréal and McGill University Health Center, Montreal, Quebec, Canada.

Abstract

BACKGROUND:

Bacterial biofilms may be involved in refractory chronic rhinosinusitis (CRS). In vitro, we studied methods for removing biofilms formed by Staphylococcus aureus and Pseudomonas aeruginosa.

METHODS:

Bacterial isolates were obtained from patients with refractory CRS and were plated and treated with either static administration of citric acid/zwitterionic surfactant (CAZS), saline delivered with hydrodynamic force, or CAZS delivered hydrodynamically. Results were assessed by counting colony-forming units (CFUs) and by confocal scanning laser microscopy (CSLM).

RESULTS:

All treatments produced significant reductions in CFU counts (p >or= 0.002). Hydrodynamic CAZS provided the greatest reduction, decreasing CFU counts from control values by 3.9 +/- 0.3 logs and 5.2 +/- 0.5 logs for S. aureus and P. aeruginosa, respectively (99.9% reduction; p = 0.001). CSLM showed decreases in biofilm coverage.

CONCLUSION:

Hydrodynamic delivery of a soap-like surfactant and a calcium-ion sequestering agent may disrupt biofilms associated with CRS. Our results may be relevant to a new approach to refractory CRS.

PMID:
17883887
DOI:
10.2500/ajr.2007.21.3069
[Indexed for MEDLINE]

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