Study on optimized method for disinfection of object surface in ICU

OBJECTIVE To compare bacteriostatic effect of different disinfectants acting on frequently-touched surfaces in ICUs at different time points after disinfection so as to put forward the reasonable disinfection method and disinfection frequency combined with cost analysis.METHODS We wiped the four frequently-touched surfaces in ICUs with disinfectant containing 500mg/L chlorine,the electrolyzed oxidizing water(EOW),antiseptic wipe from Jielijia and CaviWipes respectively.The culture samples were collected from the surfaces before wiping,after wiping for 15 min,1 h,2 h,4 h and 6 h respectively.The bacterial clearance rate and the qualified rate of bacterial colony counts on the surfaces were compared between the difference disinfectants at different time points after the disinfection.RESULTS The bacteriostatic rate in the EOW group was lower than that in the other three groups at five time points after disinfection(P0.001),Whereas,the bacteriostatic rate at 4 h after disinfection was more than 90.0% with other three methods of disinfection,the bacteriostatic rates of four different disinfection methods were all less than 60.0% at 6 h after disinfection.The qualified rate of the bacterial colony counts on the surfaces in the EOW group was lower than that in other groups at 4 h after disinfection(P0.001),similarly,the qualified rate of total bacterial colony counts on the surfaces was more than 90.0% in other three groups at 2 h after disinfection and was less than 40.0% in all the four methods at 4h after disinfection.The cost of the four disinfection methods for each time in a descending order were as follows ∶ CaviWipes,chlorine-containing disinfectant,antiseptic wipe from Jielijia,and EOW.CONCLUSION Antiseptic wipe containing the effective ingredients of alkyl bis-ammonium salts can be chosen as a preferred method for the disinfection of object surfaces in the hospital wards,it is suggested that this method should be used in the ICU with the frequency of wiping disinfection of every four hours.