The authors have experience with a convulsive and comatoae patient who had intravenous regional anesthesia with 15ml of 2% lidocaine hydrochloride (total 300 mg). These complications were developed after sudden deflation of a pneumatic tourniquet, at the completion of debridement and pin fixation for traumatic open fracture on the right middle and ring fingers in a local clinic. This patient was treated at the I.C.U. of Busan National University Hospital without any other sequela. The authors re-emphasize the dangerous risks such as convulsions or even cardiac arrest when using a high concentration of lidocaine hydrochloride in intravenous regional anesthesia, as performed frequently.