<qa>  What is the name of the surgical field visualization?Then preincisional blood pressure BP will be measured and will continue to be noted every 15 minutes. At the conclusion of the procedure the surgeon will rate intraoperative bloodlessness on a four-point scale: 1bloodless, 2nearly bloodless, some bleeding; 3bloody, tourniquet is no better than not using; or 4venous tourniquet, tourniquet is making the procedure more difficult. Intraoperative bloodlessness is being used to determine the functionality and effectiveness of the tourniquet, surgical field visualization, and surgical site dryness. 