The hospital received a 19-year-old patient injured in a landmine explosion with an open displaced mandibular fracture in the area of the left mandibular angle and a contused lacerated wound of the left submandibular area. The patient is in moderately severe condition, pulse is 80/min., blood pressure is 110/80 mm Hg. What anesthesia should be given to the patient for initial surgical d-bridement?