高压氧舱氧气湿化液的细菌污染调查分析

Bacteriological Contamination of Oxygen Humidifying Fluid in Hyperbaric Oxygen Chamber:A Primary Research and Analysis

目的了解医院高压氧舱氧气湿化液细菌污染情况,为避免因高压氧舱氧气湿化液污染引起的医院感染提供参考。方法分别采取定期更换湿化液措施前后,对医院高压氧舱3个氧气湿化罐中的氧气湿化液,每季度采样1次,进行细菌数量计数和细菌鉴定。结果更换湿化液措施前后,湿化液中的平均菌落数分别为(7.9×104)CFU/ml和(2.8×103)CFU/ml,分离出的细菌为条件致病菌:金黄杆菌属、鲍氏不动杆菌、大肠埃希菌、铜绿假单胞菌、白色假丝酵母菌等,金黄杆菌属的分离频率占分离菌株的首位,并无季节性变化。结论高压氧舱氧气湿化罐应定期消毒,湿化液应每日更换,湿化液中的菌落数最好<103CFU/ml。

OBJECTIVE To find out the situation of bacteriological contamination of oxygen humidified fluid in the hyperbaric oxygen chamber in Nanfang Hospital and take appropriate measures accordingly to provide valuable reference for avoiding possibly resulting hospital infection.METHODS Before and after beginning periodically changing oxygen humidified fluid,the humidifying fluid in the oxygen humidifiers of three hyperbaric oxygen chambers in this hospital was sampled once a season.The samples were analyzed with bacteria counting and identification.RESULTS The average amount of bacteria in the samples before and after changing oxygen humidified fluid was（7.9 × 10^4） CFU/ml and（2.8 × 10^3） CFU/ml,respectively.Identified bacteria were conditioned pathogens,including Chryseobacterium,Acinetobacter baumannii,Escherichia coli,Pseudomonas aeruginosa,Candida albicans,etc.Among them the frequency of Chryseobacterium was the highest.The results had no correlation with the changing of seasons.CONCLUSIONS Hyperbaric oxygen chamber should be disinfected periodically,the humidified fluid should be changed every day,and the amount of bacteria in it should lower than 10^3 CFU/ml.