Authors: Brigita Tićac Robert Tićac Tomislav Rukavina Palmira Gregorović Kesovija Dijana Pedisić Boris Maljevac Radan Starčević
Publish Date: 2010/04/30
Volume: 267, Issue: 10, Pages: 1579-1586
Abstract
The purpose of this study was to determine the presence of individual microorganisms and the most frequent microbial combinations in the biofilm of the indwelling Provox2 voice prosthesis in situ Furthermore we wanted to evaluate the possible influence of biofilm composition on the mean and median lifetime of these voice prostheses Over a 5year period implantation of a Provox2 voice prosthesis was performed in 85 patients or 90 of the overall number of patients who underwent total laryngectomy In total 100 implanted voice prostheses at least one of every patient were microbiologically processed immediately after being replaced Out of the total of 292 isolates 67 were bacteria and the remaining 33 were yeasts The most frequently found yeast species on voice prostheses biofilms was C albicans followed by C krusei and C tropicalis The most frequently isolated bacteria included Staphylococcus aureus Pseudomonas aeruginosa Escherichia coli Proteus mirabilis and Streptococcus agalactiae Simultaneous presence of bacteria and fungi was established in 83 of the processed voice prostheses in 16 of samples the biofilm contained only one or more bacterial species The mean time of implantation was 238 days and the median lifetime of the device was 180 days Dividing the prostheses in four groups according to the composition of biofilm revealed that the device lifetimes varied significantly between groups The longest lifetime of voice prostheses was associated with the presence of single fungal isolate in combination with bacteria There is a significant correlation between biofilm composition and the device life timeThe authors thank Prof Frans JM Hilgers MD PhD for practical and theoretical training and his critical review of manuscripts This paper is partially financially supported by research grants 06206212730952 and 06206212730951 of the Ministry of Science Education and Sport of the Republic of Croatia
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