2% Lidocaine Plus 0.5% Bupivacaine Versus 0.5% Bupivacaine in Brachial Block for Creation of Arteriovenous (AV) Fistula

Inclusion Criteria: * ESRD patient for AVF procedure * age \>17 year * BMI 20-35 kg/m2 * communicable Exclusion Criteria: * BMI \> 35 kg/m2 BMI \< 20 kg/m2 หรือ BW \< 35 kg * History of allergy to local anesthetic drugs * Pre-operative neurological deficit, Neuromuscular disorder หรือ old CVA * Psychiatric disorder * Coagulation disorder * Uncontrolled seizure * Pregnant and lactating women