The recurrence rate was .7% in group wit Demerol,and . % in group with Tramadol,there was a significant difference them.
The recurrence rate was .7% in group wit Demerol,and . % in group with Tramadol,there was a significant difference them.
而寒战复发率分别为 :哌替啶组 7% ,曲马多组 %。 两组差异有显著性 (P<0 0)。