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1概论医院获得性感染(nosocomial infection)是当前重要的公共卫生问题之一。根据美国疾病控制中心的统计,医院获得性感染发病率为5%~30%[1],仅在美国每年约有200万人罹患医院获得性感染。尽管ICU的床位仅占医院总床位数的5%,但ICU危重病病人由于原发病的影响,各种有创性检查治
1 Introduction nosocomial infection is one of the most important public health problems. According to the U.S. Centers for Disease Control and Prevention, the prevalence of nosocomial infections is between 5% and 30%, [1] and only about 2 million people are hospital-acquired in the United States each year. Although ICU beds account for only 5% of the total hospital beds, ICU critically ill patients due to the impact of the original disease, a variety of invasive examination