Sixty burn patients hospitalized in Department of Burns and Plastic Surgery of our hospital from February 2011 to December 2013 , conforming to the study criteria and going to have escharectomy or tangential excision followed by autologous skin grafting , were divided into sufentanil group ( S , n = 30 ) and dezocine + sufentanil group ( DS , n = 30 ) according to the random number table .