A triple arthrodesis is to be performed on an adult patient under general anesthesia with an ankle tourniquet. The patient's systolic blood pressure prior to inflation of the tourniquet is 110 mm Hg. It would be most appropriate to inflate the tourniquet how many millimeters above the patient's systolic pressure?
1) 50 mm Hg
2) 100 mm Hg
3) 200 mm Hg
4) 250 mm Hg
