Optimal tourniquet safety depends on accurately determining the minimum pressure necessary to achieve a bloodless surgical field, known as a patient's limb occlusion pressure (LOP). However, LOP is not yet routinely measured in all patients due to limitations of current techniques. This study evaluates a novel technique for measuring the LOP through the tourniquet cuff that overcomes many limitations of current LOP measurement techniques.~The goal of the study is to determine if the LOP measured by the new technique is statistically or clinically different from the LOP measured by a gold standard Doppler ultrasound technique in adult and pediatric patients
This study evaluates a novel technique for measuring the minimum pressure necessary to achieve a bloodless surgical field, known as a patient's limb occlusion pressure (LOP). Patients will have tourniquets applied to their arms and legs and LOP will be measured using the new technique and a gold standard Doppler ultrasound technique.