OBJECTIVE To determine the effect of oral sodium bicarbonate intervention on the prevention of infection in critically ill patients,in order to provide the basis for effective oral nursing.METHODS A total of 986 cases of critical patients in our hospital from Jan.2011 to Sep.2015 were selected,and they were divided into observation group and control group using a random number table method.In the observation group,493 patients were given sodium bicarbonate wipe,gargle,while the other 493 patients in the con...