OBJECTIVE To explore the relationship between the dynamic level of blood lactic acid and the illness condition and prognosis of severe pneumonia children aged less than 5years.METHODS From Jan 2010 to Dec2014,a total of 75 children with severe pneumonia who were aged less than 5years old were enrolled in the study and divided into the normal lactic acid group with 26 cases and the elevated lactic acid group with 49 cases according to the level of blood lactic acid.The duration of disappearance of symptoms,i...