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Pseudomonas aeruginosa growth in Refresh Plus®

Pinna, Antonio <1963- > and Usai, Donatella and Zanetti, Stefania Anna Lucia (2011) Pseudomonas aeruginosagrowth in Refresh Plus®. Journal of Ocular Pharmacology and Therapeutics , Vol. 27 (6), p. 561-564. eISSN 1557-7732. Article.

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DOI: 10.1089/jop.2011.0067


PURPOSE: To assess Pseudomonas aeruginosa growth in Refresh Plus(®), a unit-dose preservative-free ophthalmic solution indicated for the treatment of dry eye and after laser-assisted in situ keratomileusis (LASIK) surgery, which contains carboxymethylcellulose 0.5% as its active ingredient.
METHODS: Multiple test tubes of Refresh Plus were inoculated with 3 clinical ocular isolates of P. aeruginosa to achieve a target concentration of ∼100 colony-forming units (CFU)/mL. The tubes were incubated at 25°C and samples were aseptically removed at 6, 12, and 24 h. The samples were cultured to enumerate the population at each time point.
RESULTS: After 6 h incubation, the number of CFU/mL was 3,200 for isolate 1, 2,000 for isolate 2, and 6,480 CFU/mL for isolate 3. For all 3 organisms tested, the number of CFU/mL after 12 and 24 h incubation was >10(6) CFU/mL.
CONCLUSIONS: Under the conditions of this experiment, Refresh Plus appears to support P. aeruginosa growth, suggesting that if the solution in a unit-dose vial of Refresh Plus were contaminated with P. aeruginosa during use, the organism would survive and replicate in the solution over time. Noncompliance with the manufacturer's recommendations (i.e., reuse of an open vial) may result in contamination of the solution with P. aeruginosa, which may cause severe keratitis.

Item Type:Article
ID Code:7400
Uncontrolled Keywords:Pseudomonas aeruginosa, Refresh Plus®, carboxymethylcellulose, unit-dose vials
Subjects:Area 06 - Scienze mediche > MED/30 Malattie apparato visivo
Area 06 - Scienze mediche > MED/07 Microbiologia e microbiologia clinica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
001 Università di Sassari > 01 Dipartimenti > Chirurgia, microchirurgia e specialità medico-chirurgiche
Publisher:Mary Ann Liebert
Additional Information:This article was in part presented as a scientific poster at the 17th Annual Scientific Meeting of the Medical Contact Lens and Ocular Surface Association (MCLOSA), London, United Kingdom, November 19, 2010.
Deposited On:19 Apr 2012 11:30

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