Objective To study the effect of different glucocorticoid dose on blood glucose in severe COPD patients complicated with pneumonia. Methods COPD patients were divided into three groups based upon the average glucocorticoid dose per-day,the low-dose group( n = 87),the middle dose group( n = 81) and the high dose group( n = 80). The difference of hyperglycemia events and time points were compared among the three groups,and the middle and high dose relative hyperglycemia events with CPIS score and APACHE II sc...