CT실의 환경오염평가와 환경소독에 관한 연구

The Estimation of Environmental Contamination and Environmental Disinfection in Computed Tomography Room

Purpose Technological advance in computed tomography(CT) have led to an increase in the number of patients that can be admitted daily. This increase has caused a rise in nasocomial infections. This research was investigated the disinfectant power of two solutions: 75% ethyl alcohol and a diluted NaOCI 4% solution. Materials and methods In the research 5 representative bacteria were found in the CT room. The five strains of bacteria are coagulase-negative staphylococci (CNS), methicillin-resistant coagulase-negative staphylococci (MRCNS), methicillin-resistant staphylococci aureus(MRSA) and staphylococci aureus(SA). Samples were acquired from 10 locations: the patient couch, control button, door handle in the both CT scan rooms and telephone and operator mouse in both operator rooms. Following the naked eye survey method of a blood agar plate, colonies were described as many(+++, 3 or more colonies) moderate(++, 2 colonies), and 1 colony was few(+). Counting was done by using Mini-tab version 15 statistical processing program. Results A lot of CNS was detected 6 of the 10 locations(60%) in the both CT scan rooms and operator rooms before disinfection. Results after disinfection with 75% ethyl alcohol were detected in just 1 location which was moderate(++) and the others were few(+) or no growth. The extinction rate of total colonies was 97.5% compared with before disinfection. Results after disinfection with the NaOCL 4% diluted solution were detected in 3 locations with CNS. However all locations were classified as few(+) and total colonies was just one. The disinfection rate of both solutions was similar at 97.5% for the 75% ethyl alcohol solution and 98% for the NaOCI 4% solution. Conclusion Failing to disinfect the CT rooms daily leads to growth of non-pathogenic bacteria. Although the disinfectant power of both solutions was similar, this study recommends the use of NaOCI 4% because it was much more efficient dian the 75% ethyl alcohol.