Patients in Group S received 32mL of 1.5 % lidocaine + epinephrine 5g/mL , while those in Group SD received 20mL of 1.5 % lidocaine + epinephrine 5g/mL followed by distal median , radial , and ulnar nerve blocks using equal volumes of 2 % lidocaine +0.5 % levobupivacaine ( 4mL/nerve ) .