OBJECTIVE To explore the clinical effect of use of in the AF-C filtering-bacteria aspirating oxygen tube with low noise so as to offer the clinical oxygen therapy patients the comfortable and safe oxygen aspiration apparatus and effectively control iatrogenic infections.METHODS A total of 120 patients who were hospitalized in the respiratory department from May 2013 to Aug 2013 and needed to receive long-term oxygen therapy were enrolled in the study and divided into the experimental group and the control g...