Reprocessamento de cateteres de angiografia cardiovascular após uso clínico e contaminados artificialmente: avaliação da eficácia da limpeza e da esterilização.

The healthy assistance implies in risk, which can be maximized, minimized or projected based on the scientific data. The reprocessing of single used devices is a practice that each day has demanded efforts of the healthcare professionals in order to search and to produce scientific evidences to help them make decision in relation to not reuse or reuse under safety conditions. The objective of this study was to evaluate different cleaning processes and sterilization in ethylene oxide 100% of the angiographic catheters in order to determine the capacity in reducing of the bioburden and the organic residual before and after patient use, as well as in simulated use with soil test. It is an experimental research, comparative and controlled permed in the Research Centre of the Saint Boniface General Hospital affiliated to the University of Manitoba located in Winnipeg, Canada. The catheters had been used only one time for coronariographic exam and submitted to the analysis of organic residues (hemoglobin, carbohydrate, protein and endotoxin) by in situ and destructive test reading by spectrophotometer. The bioburden was evaluated by microbial culture. These experiments had been performed in four phases, being the first immediately after patient use to determine the basaline soil; the second after patient use and cleaning of the catheter by different methods; the third after patient use, soil test inoculation and cleaning by different methods. The fourth phase was performed after patient use and simulated reuse. Descriptive and analytical statistic analysis by parametric statistical tests (variance analysis) or no parametric tests (Kruskall-Wallis) were performed. Had been considered bilateral tests with a significance level < 0,05 and the confidence interval was 95%. It was considered clening failure of the cleaning process any positive results of the detention of organic and microbiological residue. The catheters were submitted to the following cleaning methods: manual washing with enzymatic detergent with tap water or reverse osmosis sterile rinsing; manual washing with hydrogen peroxide detergent rinsing in reverse osmosis sterile water, automated washing with no rinse or reverse osmose sterile water; hydrogen peroxide detergent pumping with tap water or reverse osmosis sterile rinsing . The results gotten in our study showed the maintenance of the bioburden before and after the cleaning of the catheters. In the baseline phase 8,2% of the cultures were positive cultures and the microbial load was 500CFU/device. After cleaning it was 8,3% and the average microbial load was 250 CFU/device. The baseline organic residues data were hemoglobin 146,3g/device, protein 628,5 g/device, carbohydrate 7,0g/device and endotoxin 38,0EU/device. After five simulated use, the indirect hemoglobin concentration was lower of the test limit of detention, protein = 107,7 g/device, carbohydrate = 340,1g/device and endotoxin=5,4EU/device. The organic residual analysis according the cleaning methods found different levels of reduction. The cleaning methods that had used a hydrogen peroxide detergent showed better performance relating the enzymatic detergents methods, as well as hydrogen peroxide detergent pumping with

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