To compare the effect of three disinfection processes of mobile dressing change trolly.

A mobile dressing change cart was selected from the dressing change room in the plastic and burn surgery ward, and three disinfection processes were respectively adopted for disinfection. Process A: disinfect the dressing change cart every morning, after dressing change at noon and after dressing change in the afternoon. Process B: disinfect the dressing change cart thoroughly before dressing in the morning and after dressing in the afternoon. Process C: disinfect the dressing cart thoroughly before dressing change in the morning and after dressing change in the afternoon, meanwhile, the key parts of the dressing change cart, including the roof, cart handle and drawer handle, should be disinfected in the same way before each movement of the dressing change cart( before leaving the dressing change unit). Samples were collected daily after disinfection in the morning, before disinfection at noon and in the afternoon. The sample qualification rate and detection rate of colony-free samples were compared under three disinfection processes. The sample qualification rete and detection rate of colony-free samples in three disinfection processes as well as the difference between two groups were compared by chi-square test.

The qualification rate of samples before dressing change under the three disinfection processes was 100%. The qualified rate of samples were 98.85% and 100.00% at noon and in the afternoon respectively after dressing change for process A, while the qualified rate of samples were both 100.00% at noon and in the afternoon for process C, and there were statistically significant differences when compared with prcess B(χ²=6.653, 8.219, 10.227, 6.610; P<0.05). There was no statistically significant difference between process A and process C(P>0.05). As for the detection rate of colony-free samples, there was no statistically significant difference between three groups before disinfection(P>0.05). There were statistically significant differences between three groups at noon and afternoon(χ²=37.58, 30.38; P<0.05). A further comparison between two groups showed that , the detection rate of colony-free samples in process C was 100.00% at noon and 97.92% in the afternoon, which was higher than that in both process A(62.07% and 48.33%) and process B(60.00% and 66.67%), there were statistically significant differences(χ²=35.726, 31.443, 32.143, 12.952; P<0.05). There was no statistically significant difference between process A and precess B(χ²=0.023, 1.616; P>0.05).

The best disinfection effect can be achieved by thoroughly disinfection the dressing change cart before dressing change in the morning and after dressing change in the afternoon, and at the same time increasing disinfection of key parts before each movement of the dressing change cart.