At what pressure should the tourniquet be set for an adult thigh?

At what pressure should the tourniquet be set for an adult thigh?

• A. 150-200 mm Hg
• B. 400-450 mm Hg
• C. 600-700 mm Hg
• D. 300-350 mm Hg

Answer: (D)

Understanding tourniquet pressure for a thigh hinges on stopping arterial flow while minimizing tissue injury. The thigh contains large muscles and the femoral artery, so a higher pressure is needed than for the arm to reliably occlude blood flow. In adults, a typical setting for the thigh is around 300-350 mm Hg, which reliably occludes arterial flow without excessive pressure. Pressures in the 150-200 mm Hg range are usually insufficient to stop flow in the thigh, while pressures as high as 400-450 mm Hg or 600-700 mm Hg increase the risk of nerve, muscle, and tissue damage. The key is using the lowest effective pressure that achieves occlusion, which for a standard thigh cuff is about 300-350 mm Hg.

Understanding tourniquet pressure for a thigh hinges on stopping arterial flow while minimizing tissue injury. The thigh contains large muscles and the femoral artery, so a higher pressure is needed than for the arm to reliably occlude blood flow. In adults, a typical setting for the thigh is around 300-350 mm Hg, which reliably occludes arterial flow without excessive pressure. Pressures in the 150-200 mm Hg range are usually insufficient to stop flow in the thigh, while pressures as high as 400-450 mm Hg or 600-700 mm Hg increase the risk of nerve, muscle, and tissue damage. The key is using the lowest effective pressure that achieves occlusion, which for a standard thigh cuff is about 300-350 mm Hg.