ICU空气中微生物和颗粒物的分布特征及其相关因素

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Distribution characteristics and related factors of microorganisms and particulate matter in the air of ICU

YANG Xin1，2， FAN Shanhong3*， JIN Yafei3， XU Wen3， GE Wei3， HE Gaihua3， HUO Xinxin3， BIAN Mei1， ZHANG Li′na1

1.School of Nursing， Shaanxi University of Chinese Medicine， Shaanxi 712046 China； 2.The First Affiliated Hospital of Xi′an Jiaotong University; 3.Second Hospital Affiliated to Air Force Medical University

*Corresponding Author  FAN Shanhong， E⁃mail： 2582748002@qq.com

Abstract    Objective： To investigate the dynamic distribution characteristics of microbial concentrations and particulate matter （PM） particle size in the air of hospital intensive care units （ICU） and their associated factors. Methods：A convenience sampling method was used to select a multi-bed open ICU in a tertiary hospital in Xi'an as the sampling site.The TSI 9 360 laser dust particle counter was used to sample six particle sizes with aerodynamic equivalent diameters （AED） greater than 0.3， 0.5， 1.0， 2.5， 5.0，and 10.0 µm within the ICU. Results： In actual conditions， the microbial concentrations and number of particulate matter in the ICU showed fluctuating trends. Microbial concentrations were negatively correlated with indoor temperature and humidity， and positively correlated with the number of staff， number of aerosol-generating procedures （AGP）， and patient occupancy rate. The number of particulate matter was negatively correlated with indoor humidity and positively correlated with the number of staff and number of AGP.Conclusion： Within a certain range， microbial concentrations in the ICU decrease as temperature and humidity increase， but increase with the number of fixed and active individuals in the hall， total number of staff， patient occupancy rate，and number of AGP.The number of particulate matter decreases within a certain range as indoor humidity increases， but increases with the number of fixed and active individuals in the hall， total number of staff， and number of AGP.The main source of indoor particulate matter is nebulization procedures.

Keywords    intensive care unit （ICU）； microbial aerosol； particulate matter； distribution characteristics； related factors； hospital infection

摘要  目的：调查医院重症监护室（ICU）空气中微生物浓度和颗粒物粒径的动态分布特征及其相关因素。（剩余11058字）