What is done to an upper extremity with an Esmarch bandage prior to inflation of the double-cuffed tourniquet used in Bier block anesthesia?

Question

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The Esmarch bandage is used to exsanguinate the upper extremity, meaning to remove blood from the limb to allow for clear visualization and minimize bleeding during the procedure. This is necessary before inflating the double-cuffed tourniquet for Bier block anesthesia. Embolization refers to blocking a blood vessel with an embolus, which is not relevant to this procedure. Evisceration refers to organs protruding from the body, also not relevant. Extravasation refers to the leakage of fluid or blood from a vessel into surrounding tissue, which may be a complication of the procedure but not part of the preparation process.

What Is Done to an Upper Extremity with an Esmarch