肺炎专用CT机房空气消毒效果评价--应对新型冠状病毒疫情的防控管理

Management of prevention and control of coping with epidemic situation of 2019-nCov:air disinfection in dedicated CT machine room of COVID-19

目的:监测不同消毒方法下新型冠状病毒肺炎(COVID-19)专用CT机房空气细菌菌落数,评价既能达到最好消毒效果、又能保护机器设备的空气消毒方法。方法:分别采用紫外线消毒灯、等离子空气循环消毒机、紫外线消毒灯结合等离子空气循环消毒机3种消毒方法,对COVID-19专用CT机房进行空气消毒。应用自然沉降法采集样本,评价3种方法的消毒效果。结果:采用的3种消毒方法均能达到消毒要求,消毒前后的细菌菌落数比较差异有统计学意义(F=509.0,P<0.05);而消毒后3种消毒方法对比中,紫外线消毒灯结合等离子空气消毒机的方法比单纯使用等离子空气消毒机方法效果更好,差异具有统计学意义(t=2.717,P<0.05)。结论:空气中细菌菌落对紫外线敏感,采用紫外线消毒灯可达到良好的消毒效果,但持续时间有限,且频繁使用可能会加速CT机表面老化。因此推荐紫外线消毒灯结合等离子空气消毒机,可实现对CT机房空气的持续消毒,达到满意的消毒效果。

Objective:To monitor the colony forming unit(CFU) of air bacteria in dedicated computed tomography(CT) machine room of Coronavirus Disease 2019(COVID-19) which caused by novel coronavirus(2019-nCoV) under different disinfection method, and assess an air disinfection method not only can achieve optimal disinfection effect, but also can protect device and equipment. Methods: Three air disinfection methods included Ultraviolet Disinfection Lamp(UDL), Plasma air disinfection machine(PADM) and the combination of former two methods(UDL & PADM) were adopted to implement air disinfection for dedicated machine room of COVID-19. The natural sedimentation method was applied to collect samples for evaluating disinfection effects of 3 kinds of methods. Results: All three methods could achieve disinfection effect, and the difference of bacterial CFU between pre and post disinfection was significant(F=509.0, P<0.05). In the comparisons of 3 kinds of disinfection methods post disinfection, the effect of combination method of UDL and PADM was significantly better than that of single PADM method(t=2.717, P<0.05). Conclusion: Bacterial CFU of air are vulnerable to ultraviolet. UDL can achieve better disinfection effect, while its’ time of duration is finite and the frequent use of UDL would accelerate damage of the surface of CT machine. Therefore, the recommended combination method of UDL and PADM can realize sustainable disinfection for air of CT machine room until to achieve the satisfying disinfection effects.