Following axillary plexus blockade , neither patient group showed any statistically significant difference in the percentage of functionally successful blockade ( 30 mL , 100 % : 20 mL , 97 % ; P = 0.48 ) , surgically successful blockade ( 30 mL , 100 % ; 20 mL , 94 % ; P = 0.23 ) , cumulative sensory or motor blockade surgical time , block performance time , preoperative midazolam use , or intraoperative propofol use .