5129/2002/QD-YT on December 19, 2002 of the Health Minister 13 Diagram study Evaluation on BP, heart rate, sedative effects and some adverse effects by mixture of bupivacaine with dexmedetomidine - Vital signs by monitor: BP, HR, ECG, SpO2 at before and after brachial plexus block. - Intraoperative sedation: level, onset and duration time - Some adverse effects - Record some adverse effects Select patients to study, divided into two groups Group B, 54 patients Brachial plexus block, 30 ml bupivacain 0.25% (75mg) Group BD, 54 patients Brachial plexus block, 30 ml bupivacain 0.25% + dexmedetomidin 100 mcg Comparing intraoperative anesthetic and postoperative analgesic efficacy - Sensory blockage: level, onset and duration time - Motor blockage: level, onset and duration time - Intraoperative anesthetic efficiency - Postoperative analgesic efficacy: analgesic time và VAS score General characteristics of the patient and surgery - Age - ASA classification - Gender - Historical chronic disease - Weight, height - Surgical location - BMI - Time surgery 14 Chapter 3 RESEARCH RESULTS 3.1.