医院常用空气消毒方法的调查

<正> 医院中病员、带菌者排出的病原菌可直接或间接播散入空气,以气溶胶方式进行传播。因此,为了控制空气传染,医院内的空气需要进行生物净化。医院中空气消毒的方法较多,为进一步了解它们的实用效果,指导临床应用,我们对我院现用方法进行了调查。

INVESTGIATION ON AIR DISINFECTION METHODS COMMONLY USED IN HOSPITALS

The germicidal efficacy of air disinfection methods currently used in hospital was examined. Spray of 0.2% peracetic acid, 3% hydrogen peroxide, or 0.1% chlorhexidine gluconate with atomizer type GM-1 could reduce bacteria content of air by 89.6%, 90.2% and 41.8% respectively, while spray of tap water in control group could only reduce by 15.0%. The bacteria content of air returned to near original level two hours after disinfection when the room was occupied. In investigation of air disinfection by ultraviolet radiation, one 30 W lamp per 10 m~2 was used and samples were taken after irradiation for 30 min. The bacteria content of air decreased by 26.2% when radiation intensity of the lamp (1 m apart)was 42 μW/cm~2 and by 97.8% when the intensity was 130 μW/cm~2. Operation of filtered laminar air flow (400 changes of air per hour) for 30 min, turbulent flow ventilaton and natural ventilation (by opening window) could reduce bacteria content of air by 97.6%, 46.9% and 17.4% respectively. Negative ion generator also showed certain bacteria-reducing effect. The nearer the air to the generator, the less the bacteria content of the air. The bacteria content of air at a distance of 30 cm decreased by 58.9%. The disinfection incense showed poor air disinfection effect and reduced bacteria content only by 22.4%